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Posted to commits@systemml.apache.org by de...@apache.org on 2017/05/19 21:03:47 UTC

incubator-systemml git commit: [SYSTEMML-1455] Change the term PLAIN_R2 to R2

Repository: incubator-systemml
Updated Branches:
  refs/heads/master 1ebe2e178 -> a6428f7d8


[SYSTEMML-1455] Change the term PLAIN_R2 to R2

Closes #500.


Project: http://git-wip-us.apache.org/repos/asf/incubator-systemml/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-systemml/commit/a6428f7d
Tree: http://git-wip-us.apache.org/repos/asf/incubator-systemml/tree/a6428f7d
Diff: http://git-wip-us.apache.org/repos/asf/incubator-systemml/diff/a6428f7d

Branch: refs/heads/master
Commit: a6428f7d88b39792ccb5440b5bc3bedff4df21de
Parents: 1ebe2e1
Author: krishnakalyan3 <kr...@gmail.com>
Authored: Fri May 19 14:01:07 2017 -0700
Committer: Deron Eriksson <de...@us.ibm.com>
Committed: Fri May 19 14:01:07 2017 -0700

----------------------------------------------------------------------
 docs/algorithms-regression.md          | 16 ++++++++--------
 docs/hadoop-batch-mode.md              | 10 +++++-----
 docs/standalone-guide.md               | 10 +++++-----
 scripts/algorithms/GLM-predict.dml     | 12 ++++++------
 scripts/algorithms/LinearRegCG.dml     | 18 +++++++++---------
 scripts/algorithms/LinearRegDS.dml     | 18 +++++++++---------
 scripts/algorithms/StepLinearRegDS.dml | 18 +++++++++---------
 7 files changed, 51 insertions(+), 51 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/docs/algorithms-regression.md
----------------------------------------------------------------------
diff --git a/docs/algorithms-regression.md b/docs/algorithms-regression.md
index 494693c..22c6959 100644
--- a/docs/algorithms-regression.md
+++ b/docs/algorithms-regression.md
@@ -346,11 +346,11 @@ pair per each line.
 | AVG\_RES\_Y           | Average of the residual $Y - \mathop{\mathrm{pred}}(Y \mid X)$, i.e. residual bias
 | STDEV\_RES\_Y         | Standard Deviation of the residual $Y - \mathop{\mathrm{pred}}(Y \mid X)$
 | DISPERSION            | GLM-style dispersion, i.e. residual sum of squares / \#deg. fr.
-| PLAIN\_R2             | Plain $R^2$ of residual with bias included vs. total average
+| R2                    | $R^2$ of residual with bias included vs. total average
 | ADJUSTED\_R2          | Adjusted $R^2$ of residual with bias included vs. total average
-| PLAIN\_R2\_NOBIAS     | Plain $R^2$ of residual with bias subtracted vs. total average
+| R2\_NOBIAS            | Plain $R^2$ of residual with bias subtracted vs. total average
 | ADJUSTED\_R2\_NOBIAS  | Adjusted $R^2$ of residual with bias subtracted vs. total average
-| PLAIN\_R2\_VS\_0      | * Plain $R^2$ of residual with bias included vs. zero constant
+| R2\_VS\_0             | * $R^2$ of residual with bias included vs. zero constant
 | ADJUSTED\_R2\_VS\_0   | * Adjusted $R^2$ of residual with bias included vs. zero constant
 
 \* The last two statistics are only printed if there is no intercept (`icpt=0`)
@@ -471,7 +471,7 @@ $n\,{-}\,m\,{-}\,1$ is positive and the regularization constant
 $\lambda$ is negligible or zero. The formulas for $\sigma$ and
 $R^2$ are:
 
-$$R^2_{\textrm{plain}} = 1 - \frac{\mathrm{RSS}}{\mathrm{TSS}},\quad
+$$R^2 = 1 - \frac{\mathrm{RSS}}{\mathrm{TSS}},\quad
 \sigma \,=\, \sqrt{\frac{\mathrm{RSS}}{n - m - 1}},\quad
 R^2_{\textrm{adj.}} = 1 - \frac{\sigma^2 (n-1)}{\mathrm{TSS}}$$ 
 
@@ -1881,9 +1881,9 @@ statistic;
 | AVG\_RES\_Y          |  +  |       | $Y$-column residual average of $Y - pred. mean(Y\\|X)$ |
 | STDEV\_RES\_Y        |  +  |       | $Y$-column residual st. dev. of $Y - pred. mean(Y\\|X)$ |
 | PRED\_STDEV\_RES     |  +  |   +   | Model-predicted $Y$-column residual st. deviation|
-| PLAIN\_R2            |  +  |       | Plain $R^2$ of $Y$-column residual with bias included |
+| R2                   |  +  |       | $R^2$ of $Y$-column residual with bias included |
 | ADJUSTED\_R2         |  +  |       | Adjusted $R^2$ of $Y$-column residual w. bias included |
-| PLAIN\_R2\_NOBIAS    |  +  |       | Plain $R^2$ of $Y$-column residual, bias subtracted |
+| R2\_NOBIAS           |  +  |       | $R^2$ of $Y$-column residual, bias subtracted |
 | ADJUSTED\_R2\_NOBIAS |  +  |       | Adjusted $R^2$ of $Y$-column residual, bias subtracted |
 
 * * *
@@ -2114,7 +2114,7 @@ $m$ with the intercept or $m+1$ without the intercept.
 
 | Statistic             | Formula |
 | --------------------- | ------------- |
-| $\texttt{PLAIN_R2}_j$ | $$ \displaystyle 1 - \frac{\sum\limits_{i=1}^n \,(y_{i,j} - \mu_{i,j})^2}{\sum\limits_{i=1}^n \Big(y_{i,j} - \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n  y_{i',j} \Big)^{2}} $$
+| $\texttt{R2}_j$ | $$ \displaystyle 1 - \frac{\sum\limits_{i=1}^n \,(y_{i,j} - \mu_{i,j})^2}{\sum\limits_{i=1}^n \Big(y_{i,j} - \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n  y_{i',j} \Big)^{2}} $$
 | $\texttt{ADJUSTED_R2}_j$ | $$ \displaystyle 1 - {\textstyle\frac{N_{\mathstrut} - 1}{N^{\mathstrut} - m}}  \, \frac{\sum\limits_{i=1}^n \,(y_{i,j} - \mu_{i,j})^2}{\sum\limits_{i=1}^n \Big(y_{i,j} - \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n  y_{i',j} \Big)^{2}} $$
  
 
@@ -2125,7 +2125,7 @@ $m$ with the intercept or $m+1$ without the intercept.
 
 | Statistic             | Formula |
 | --------------------- | ------------- |
-| $\texttt{PLAIN_R2_NOBIAS}_j$ | $$ \displaystyle 1 - \frac{\sum\limits_{i=1}^n \Big(y_{i,j} \,{-}\, \mu_{i,j} \,{-}\, \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n  (y_{i',j} \,{-}\, \mu_{i',j}) \Big)^{2}}{\sum\limits_{i=1}^n \Big(y_{i,j} - \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n y_{i',j} \Big)^{2}} $$
+| $\texttt{R2_NOBIAS}_j$ | $$ \displaystyle 1 - \frac{\sum\limits_{i=1}^n \Big(y_{i,j} \,{-}\, \mu_{i,j} \,{-}\, \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n  (y_{i',j} \,{-}\, \mu_{i',j}) \Big)^{2}}{\sum\limits_{i=1}^n \Big(y_{i,j} - \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n y_{i',j} \Big)^{2}} $$
 | $\texttt{ADJUSTED_R2_NOBIAS}_j$ | $$ \displaystyle 1 - {\textstyle\frac{N_{\mathstrut} - 1}{N^{\mathstrut} - m'}} \, \frac{\sum\limits_{i=1}^n \Big(y_{i,j} \,{-}\, \mu_{i,j} \,{-}\, \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n  (y_{i',j} \,{-}\, \mu_{i',j}) \Big)^{2}}{\sum\limits_{i=1}^n \Big(y_{i,j} - \frac{N_{i\mathstrut}}{N^{\mathstrut}} \sum\limits_{i'=1}^n y_{i',j} \Big)^{2}} $$
 
 

http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/docs/hadoop-batch-mode.md
----------------------------------------------------------------------
diff --git a/docs/hadoop-batch-mode.md b/docs/hadoop-batch-mode.md
index 3af7c0c..37df064 100644
--- a/docs/hadoop-batch-mode.md
+++ b/docs/hadoop-batch-mode.md
@@ -760,11 +760,11 @@ Let's go ahead and run the SystemML example from the GitHub README.
 	AVG_RES_Y,1.5905895170230406E-10
 	STDEV_RES_Y,2.0668015575844624E-8
 	DISPERSION,4.262683023432828E-16
-	PLAIN_R2,1.0
+	R2,1.0
 	ADJUSTED_R2,1.0
-	PLAIN_R2_NOBIAS,1.0
+	R2_NOBIAS,1.0
 	ADJUSTED_R2_NOBIAS,1.0
-	PLAIN_R2_VS_0,1.0
+	R2_VS_0,1.0
 	ADJUSTED_R2_VS_0,1.0
 	Writing the output matrix...
 	END LINEAR REGRESSION SCRIPT
@@ -795,9 +795,9 @@ Let's go ahead and run the SystemML example from the GitHub README.
 	AVG_RES_Y,1,,2.5577864570734575E-10
 	STDEV_RES_Y,1,,2.390848397359923E-8
 	PRED_STDEV_RES,1,TRUE,1.0
-	PLAIN_R2,1,,1.0
+	R2,1,,1.0
 	ADJUSTED_R2,1,,1.0
-	PLAIN_R2_NOBIAS,1,,1.0
+	R2_NOBIAS,1,,1.0
 	ADJUSTED_R2_NOBIAS,1,,1.0
 	15/11/17 15:51:17 INFO api.DMLScript: SystemML Statistics:
 	Total execution time:		0.269 sec.

http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/docs/standalone-guide.md
----------------------------------------------------------------------
diff --git a/docs/standalone-guide.md b/docs/standalone-guide.md
index 586e56e..a2a95d4 100644
--- a/docs/standalone-guide.md
+++ b/docs/standalone-guide.md
@@ -527,11 +527,11 @@ The LinearRegDS.dml script generates statistics to standard output similar to th
 	AVG_RES_Y,-3.3127468704080085E-10
 	STDEV_RES_Y,1.7231785003947183E-8
 	DISPERSION,2.963950542926297E-16
-	PLAIN_R2,1.0
+	R2,1.0
 	ADJUSTED_R2,1.0
-	PLAIN_R2_NOBIAS,1.0
+	R2_NOBIAS,1.0
 	ADJUSTED_R2_NOBIAS,1.0
-	PLAIN_R2_VS_0,1.0
+	R2_VS_0,1.0
 	ADJUSTED_R2_VS_0,1.0
 	Writing the output matrix...
 	END LINEAR REGRESSION SCRIPT
@@ -572,9 +572,9 @@ This generates statistics similar to the following to standard output.
 	AVG_RES_Y,1,,-4.1450397073455047E-10
 	STDEV_RES_Y,1,,2.0519206226041048E-8
 	PRED_STDEV_RES,1,TRUE,1.0
-	PLAIN_R2,1,,1.0
+	R2,1,,1.0
 	ADJUSTED_R2,1,,1.0
-	PLAIN_R2_NOBIAS,1,,1.0
+	R2_NOBIAS,1,,1.0
 	ADJUSTED_R2_NOBIAS,1,,1.0
 
 

http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/scripts/algorithms/GLM-predict.dml
----------------------------------------------------------------------
diff --git a/scripts/algorithms/GLM-predict.dml b/scripts/algorithms/GLM-predict.dml
index e24b16f..251d85a 100644
--- a/scripts/algorithms/GLM-predict.dml
+++ b/scripts/algorithms/GLM-predict.dml
@@ -75,9 +75,9 @@
 # AVG_RES_Y               +             Average of column residual, i.e. of Y - mean(Y|X)
 # STDEV_RES_Y             +             St.Dev. of column residual, i.e. of Y - mean(Y|X)
 # PRED_STDEV_RES          +       +     Model-predicted St.Dev. of column residual
-# PLAIN_R2                +             Plain R^2 of Y column residual with bias included
+# R2                      +             R^2 of Y column residual with bias included
 # ADJUSTED_R2             +             Adjusted R^2 of Y column residual with bias included
-# PLAIN_R2_NOBIAS         +             Plain R^2 of Y column residual with bias subtracted
+# R2_NOBIAS               +             R^2 of Y column residual with bias subtracted
 # ADJUSTED_R2_NOBIAS      +             Adjusted R^2 of Y column residual with bias subtracted
 # ---------------------------------------------------------------------------------------------
 #
@@ -284,9 +284,9 @@ if (fileY != " ")
     } else {
         var_res_Y = matrix (0.0, rows = 1, cols = ncol (Y)) / 0.0;
     }
-    plain_R2_nobias  = 1 - ss_avg_res_Y / ss_avg_tot_Y;
+    R2_nobias  = 1 - ss_avg_res_Y / ss_avg_tot_Y;
     adjust_R2_nobias = 1 - var_res_Y / var_tot_Y;
-    plain_R2  = 1 - ss_res_Y / ss_avg_tot_Y;
+    R2  = 1 - ss_res_Y / ss_avg_tot_Y;
     if (df_ss_res_Y > 0) {
         adjust_R2 = 1 - (ss_res_Y / df_ss_res_Y) / var_tot_Y;
     } else {
@@ -320,9 +320,9 @@ if (fileY != " ")
         str = append (str, "AVG_RES_Y," + i + ",," + as.scalar (avg_res_Y [1, i]));
         str = append (str, "STDEV_RES_Y," + i + ",," + as.scalar (sqrt (var_res_Y [1, i])));
         str = append (str, "PRED_STDEV_RES," + i + ",TRUE," + as.scalar (sqrt (predicted_avg_var_res_Y [1, i])));
-        str = append (str, "PLAIN_R2," + i + ",," + as.scalar (plain_R2 [1, i]));
+        str = append (str, "R2," + i + ",," + as.scalar (R2 [1, i]));
         str = append (str, "ADJUSTED_R2," + i + ",," + as.scalar (adjust_R2 [1, i]));
-        str = append (str, "PLAIN_R2_NOBIAS," + i + ",," + as.scalar (plain_R2_nobias [1, i]));
+        str = append (str, "R2_NOBIAS," + i + ",," + as.scalar (R2_nobias [1, i]));
         str = append (str, "ADJUSTED_R2_NOBIAS," + i + ",," + as.scalar (adjust_R2_nobias [1, i]));
     }
     

http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/scripts/algorithms/LinearRegCG.dml
----------------------------------------------------------------------
diff --git a/scripts/algorithms/LinearRegCG.dml b/scripts/algorithms/LinearRegCG.dml
index 25e5862..9ba7e89 100644
--- a/scripts/algorithms/LinearRegCG.dml
+++ b/scripts/algorithms/LinearRegCG.dml
@@ -59,11 +59,11 @@
 # AVG_RES_Y             Average of the residual Y - pred(Y|X), i.e. residual bias
 # STDEV_RES_Y           Standard Deviation of the residual Y - pred(Y|X)
 # DISPERSION            GLM-style dispersion, i.e. residual sum of squares / # deg. fr.
-# PLAIN_R2              Plain R^2 of residual with bias included vs. total average
+# R2                    R^2 of residual with bias included vs. total average
 # ADJUSTED_R2           Adjusted R^2 of residual with bias included vs. total average
-# PLAIN_R2_NOBIAS       Plain R^2 of residual with bias subtracted vs. total average
+# R2_NOBIAS             R^2 of residual with bias subtracted vs. total average
 # ADJUSTED_R2_NOBIAS    Adjusted R^2 of residual with bias subtracted vs. total average
-# PLAIN_R2_VS_0         * Plain R^2 of residual with bias included vs. zero constant
+# R2_VS_0               * R^2 of residual with bias included vs. zero constant
 # ADJUSTED_R2_VS_0      * Adjusted R^2 of residual with bias included vs. zero constant
 # -------------------------------------------------------------------------------------
 # * The last two statistics are only printed if there is no intercept (icpt=0)
@@ -223,7 +223,7 @@ avg_res = sum (y_residual) / n;
 ss_res = sum (y_residual ^ 2);
 ss_avg_res = ss_res - n * avg_res ^ 2;
 
-plain_R2 = 1 - ss_res / ss_avg_tot;
+R2 = 1 - ss_res / ss_avg_tot;
 if (n > m_ext) {
     dispersion  = ss_res / (n - m_ext);
     adjusted_R2 = 1 - dispersion / (ss_avg_tot / (n - 1));
@@ -232,7 +232,7 @@ if (n > m_ext) {
     adjusted_R2 = 0.0 / 0.0;
 }
 
-plain_R2_nobias = 1 - ss_avg_res / ss_avg_tot;
+R2_nobias = 1 - ss_avg_res / ss_avg_tot;
 deg_freedom = n - m - 1;
 if (deg_freedom > 0) {
     var_res = ss_avg_res / deg_freedom;
@@ -243,7 +243,7 @@ if (deg_freedom > 0) {
     print ("Warning: zero or negative number of degrees of freedom.");
 }
 
-plain_R2_vs_0 = 1 - ss_res / ss_tot;
+R2_vs_0 = 1 - ss_res / ss_tot;
 if (n > m) {
     adjusted_R2_vs_0 = 1 - (ss_res / (n - m)) / (ss_tot / n);
 } else {
@@ -255,12 +255,12 @@ str = append (str, "STDEV_TOT_Y," + sqrt (var_tot));             #  Standard Dev
 str = append (str, "AVG_RES_Y," + avg_res);                      #  Average of the residual Y - pred(Y|X), i.e. residual bias
 str = append (str, "STDEV_RES_Y," + sqrt (var_res));             #  Standard Deviation of the residual Y - pred(Y|X)
 str = append (str, "DISPERSION," + dispersion);                  #  GLM-style dispersion, i.e. residual sum of squares / # d.f.
-str = append (str, "PLAIN_R2," + plain_R2);                      #  Plain R^2 of residual with bias included vs. total average
+str = append (str, "R2," + R2);                                  #  R^2 of residual with bias included vs. total average
 str = append (str, "ADJUSTED_R2," + adjusted_R2);                #  Adjusted R^2 of residual with bias included vs. total average
-str = append (str, "PLAIN_R2_NOBIAS," + plain_R2_nobias);        #  Plain R^2 of residual with bias subtracted vs. total average
+str = append (str, "R2_NOBIAS," + R2_nobias);                    #  R^2 of residual with bias subtracted vs. total average
 str = append (str, "ADJUSTED_R2_NOBIAS," + adjusted_R2_nobias);  #  Adjusted R^2 of residual with bias subtracted vs. total average
 if (intercept_status == 0) {
-    str = append (str, "PLAIN_R2_VS_0," + plain_R2_vs_0);        #  Plain R^2 of residual with bias included vs. zero constant
+    str = append (str, "R2_VS_0," + R2_vs_0);                    #  R^2 of residual with bias included vs. zero constant
     str = append (str, "ADJUSTED_R2_VS_0," + adjusted_R2_vs_0);  #  Adjusted R^2 of residual with bias included vs. zero constant
 }
 

http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/scripts/algorithms/LinearRegDS.dml
----------------------------------------------------------------------
diff --git a/scripts/algorithms/LinearRegDS.dml b/scripts/algorithms/LinearRegDS.dml
index 2f55b41..10def79 100644
--- a/scripts/algorithms/LinearRegDS.dml
+++ b/scripts/algorithms/LinearRegDS.dml
@@ -55,11 +55,11 @@
 # AVG_RES_Y             Average of the residual Y - pred(Y|X), i.e. residual bias
 # STDEV_RES_Y           Standard Deviation of the residual Y - pred(Y|X)
 # DISPERSION            GLM-style dispersion, i.e. residual sum of squares / # deg. fr.
-# PLAIN_R2              Plain R^2 of residual with bias included vs. total average
+# R2                    R^2 of residual with bias included vs. total average
 # ADJUSTED_R2           Adjusted R^2 of residual with bias included vs. total average
-# PLAIN_R2_NOBIAS       Plain R^2 of residual with bias subtracted vs. total average
+# R2_NOBIAS             R^2 of residual with bias subtracted vs. total average
 # ADJUSTED_R2_NOBIAS    Adjusted R^2 of residual with bias subtracted vs. total average
-# PLAIN_R2_VS_0         * Plain R^2 of residual with bias included vs. zero constant
+# R2_VS_0               * R^2 of residual with bias included vs. zero constant
 # ADJUSTED_R2_VS_0      * Adjusted R^2 of residual with bias included vs. zero constant
 # -------------------------------------------------------------------------------------
 # * The last two statistics are only printed if there is no intercept (icpt=0)
@@ -165,7 +165,7 @@ avg_res = sum (y_residual) / n;
 ss_res = sum (y_residual ^ 2);
 ss_avg_res = ss_res - n * avg_res ^ 2;
 
-plain_R2 = 1 - ss_res / ss_avg_tot;
+R2 = 1 - ss_res / ss_avg_tot;
 if (n > m_ext) {
     dispersion  = ss_res / (n - m_ext);
     adjusted_R2 = 1 - dispersion / (ss_avg_tot / (n - 1));
@@ -174,7 +174,7 @@ if (n > m_ext) {
     adjusted_R2 = 0.0 / 0.0;
 }
 
-plain_R2_nobias = 1 - ss_avg_res / ss_avg_tot;
+R2_nobias = 1 - ss_avg_res / ss_avg_tot;
 deg_freedom = n - m - 1;
 if (deg_freedom > 0) {
     var_res = ss_avg_res / deg_freedom;
@@ -185,7 +185,7 @@ if (deg_freedom > 0) {
     print ("Warning: zero or negative number of degrees of freedom.");
 }
 
-plain_R2_vs_0 = 1 - ss_res / ss_tot;
+R2_vs_0 = 1 - ss_res / ss_tot;
 if (n > m) {
     adjusted_R2_vs_0 = 1 - (ss_res / (n - m)) / (ss_tot / n);
 } else {
@@ -197,12 +197,12 @@ str = append (str, "STDEV_TOT_Y," + sqrt (var_tot));             #  Standard Dev
 str = append (str, "AVG_RES_Y," + avg_res);                      #  Average of the residual Y - pred(Y|X), i.e. residual bias
 str = append (str, "STDEV_RES_Y," + sqrt (var_res));             #  Standard Deviation of the residual Y - pred(Y|X)
 str = append (str, "DISPERSION," + dispersion);                  #  GLM-style dispersion, i.e. residual sum of squares / # d.f.
-str = append (str, "PLAIN_R2," + plain_R2);                      #  Plain R^2 of residual with bias included vs. total average
+str = append (str, "R2," + R2);                                  #  R^2 of residual with bias included vs. total average
 str = append (str, "ADJUSTED_R2," + adjusted_R2);                #  Adjusted R^2 of residual with bias included vs. total average
-str = append (str, "PLAIN_R2_NOBIAS," + plain_R2_nobias);        #  Plain R^2 of residual with bias subtracted vs. total average
+str = append (str, "R2_NOBIAS," + R2_nobias);                    #  R^2 of residual with bias subtracted vs. total average
 str = append (str, "ADJUSTED_R2_NOBIAS," + adjusted_R2_nobias);  #  Adjusted R^2 of residual with bias subtracted vs. total average
 if (intercept_status == 0) {
-    str = append (str, "PLAIN_R2_VS_0," + plain_R2_vs_0);        #  Plain R^2 of residual with bias included vs. zero constant
+    str = append (str, "R2_VS_0," + R2_vs_0);                    #  R^2 of residual with bias included vs. zero constant
     str = append (str, "ADJUSTED_R2_VS_0," + adjusted_R2_vs_0);  #  Adjusted R^2 of residual with bias included vs. zero constant
 }
 

http://git-wip-us.apache.org/repos/asf/incubator-systemml/blob/a6428f7d/scripts/algorithms/StepLinearRegDS.dml
----------------------------------------------------------------------
diff --git a/scripts/algorithms/StepLinearRegDS.dml b/scripts/algorithms/StepLinearRegDS.dml
index 2efb2bb..00f50ee 100644
--- a/scripts/algorithms/StepLinearRegDS.dml
+++ b/scripts/algorithms/StepLinearRegDS.dml
@@ -57,11 +57,11 @@
 # AVG_RES_Y             Average of the residual Y - pred(Y|X), i.e. residual bias
 # STDEV_RES_Y           Standard Deviation of the residual Y - pred(Y|X)
 # DISPERSION            GLM-style dispersion, i.e. residual sum of squares / # deg. fr.
-# PLAIN_R2              Plain R^2 of residual with bias included vs. total average
+# R2                    R^2 of residual with bias included vs. total average
 # ADJUSTED_R2           Adjusted R^2 of residual with bias included vs. total average
-# PLAIN_R2_NOBIAS       Plain R^2 of residual with bias subtracted vs. total average
+# R2_NOBIAS             R^2 of residual with bias subtracted vs. total average
 # ADJUSTED_R2_NOBIAS    Adjusted R^2 of residual with bias subtracted vs. total average
-# PLAIN_R2_VS_0         * Plain R^2 of residual with bias included vs. zero constant
+# R2_VS_0               * R^2 of residual with bias included vs. zero constant
 # ADJUSTED_R2_VS_0      * Adjusted R^2 of residual with bias included vs. zero constant
 # -------------------------------------------------------------------------------------
 # * The last two statistics are only printed if there is no intercept (icpt=0)
@@ -271,7 +271,7 @@ linear_regression = function (Matrix[Double] X, Matrix[Double] y, Double m_orig,
 #		ss_res = sum (y_residual ^ 2);
 		ss_avg_res = ss_res - n * avg_res ^ 2;
 
-		plain_R2 = 1 - ss_res / ss_avg_tot;
+		R2 = 1 - ss_res / ss_avg_tot;
 		if (n > m_ext) {
 			dispersion  = ss_res / (n - m_ext);
 			adjusted_R2 = 1 - dispersion / (ss_avg_tot / (n - 1));
@@ -280,7 +280,7 @@ linear_regression = function (Matrix[Double] X, Matrix[Double] y, Double m_orig,
 			adjusted_R2 = 0.0 / 0.0;
 		}
 
-		plain_R2_nobias = 1 - ss_avg_res / ss_avg_tot;
+		R2_nobias = 1 - ss_avg_res / ss_avg_tot;
 		deg_freedom = n - m - 1;
 		if (deg_freedom > 0) {
 			var_res = ss_avg_res / deg_freedom;
@@ -291,7 +291,7 @@ linear_regression = function (Matrix[Double] X, Matrix[Double] y, Double m_orig,
 			print ("Warning: zero or negative number of degrees of freedom.");
 		}
 
-		plain_R2_vs_0 = 1 - ss_res / ss_tot;
+		R2_vs_0 = 1 - ss_res / ss_tot;
 		if (n > m) {
 			adjusted_R2_vs_0 = 1 - (ss_res / (n - m)) / (ss_tot / n);
 		} else {
@@ -303,12 +303,12 @@ linear_regression = function (Matrix[Double] X, Matrix[Double] y, Double m_orig,
 		str = append (str, "AVG_RES_Y," + avg_res);                      #  Average of the residual Y - pred(Y|X), i.e. residual bias
 		str = append (str, "STDEV_RES_Y," + sqrt (var_res));             #  Standard Deviation of the residual Y - pred(Y|X)
 		str = append (str, "DISPERSION," + dispersion);                  #  GLM-style dispersion, i.e. residual sum of squares / # d.f.
-		str = append (str, "PLAIN_R2," + plain_R2);                      #  Plain R^2 of residual with bias included vs. total average
+		str = append (str, "R2," + R2);                                  #  R^2 of residual with bias included vs. total average
 		str = append (str, "ADJUSTED_R2," + adjusted_R2);                #  Adjusted R^2 of residual with bias included vs. total average
-		str = append (str, "PLAIN_R2_NOBIAS," + plain_R2_nobias);        #  Plain R^2 of residual with bias subtracted vs. total average
+		str = append (str, "R2_NOBIAS," + R2_nobias);                    #  R^2 of residual with bias subtracted vs. total average
 		str = append (str, "ADJUSTED_R2_NOBIAS," + adjusted_R2_nobias);  #  Adjusted R^2 of residual with bias subtracted vs. total average
 		if (intercept_status == 0) {
-			str = append (str, "PLAIN_R2_VS_0," + plain_R2_vs_0);        #  Plain R^2 of residual with bias included vs. zero constant
+			str = append (str, "R2_VS_0," + R2_vs_0);                    #  R^2 of residual with bias included vs. zero constant
 			str = append (str, "ADJUSTED_R2_VS_0," + adjusted_R2_vs_0);  #  Adjusted R^2 of residual with bias included vs. zero constant
 		}