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- <div class="page-header">
- <h1>Cochrane-Orcutt Procedure </h1>
- </div>
- <h3 id="about">About</h3>
+ <div class="container mt-5 pb-4">
+
+ <div class="row">
+
+ <div class="col-lg-8">
+ <h3 id="about">About</h3>
<p>The <a href="https://en.wikipedia.org/wiki/Cochrane%E2%80%93Orcutt_estimation">Cochrane Orcutt</a> procedure is use in economics to
adjust a linear model for serial correlation in the error term.</p>
-<p>The cooresponding method in R is <a href="https://cran.r-project.org/web/packages/orcutt/orcutt.pdf"><code>cochrane.orcutt</code></a>
+<p>The cooresponding method in R is <a href="https://cran.r-project.org/web/packages/orcutt/orcutt.pdf"><code class="highlighter-rouge">cochrane.orcutt</code></a>
however the implementation differes slightly.</p>
<h4 id="r-prototype">R Prototype:</h4>
-<pre><code>library(orcutt)
+<div class="highlighter-rouge"><pre class="highlight"><code>library(orcutt)
df = data.frame(t(data.frame(
c(20.96, 127.3),
@@ -344,6 +201,7 @@ colnames(df) <- c("y", "x")
my_lm = lm(y ~ x, data=df)
coch = cochrane.orcutt(my_lm)
</code></pre>
+</div>
<p>The R-implementation is kind of…silly.</p>
@@ -416,7 +274,7 @@ Kunter et. al reccomend 3 iterations, if you don’t achieve desired results, us
<h3 id="example">Example</h3>
-<pre><code>val alsmBlaisdellCo = drmParallelize( dense(
+<div class="highlighter-rouge"><pre class="highlight"><code>val alsmBlaisdellCo = drmParallelize( dense(
(20.96, 127.3),
(21.40, 130.0),
(21.96, 132.7),
@@ -446,35 +304,29 @@ var coModel = new CochraneOrcutt[Int]().fit(drmX, drmY , ('iterations -> 2))
println(coModel.rhos)
println(coModel.summary)
</code></pre>
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http://git-wip-us.apache.org/repos/asf/mahout/blob/5112e9ec/docs/latest/algorithms/regression/serial-correlation/dw-test.html
----------------------------------------------------------------------
diff --git a/docs/latest/algorithms/regression/serial-correlation/dw-test.html b/docs/latest/algorithms/regression/serial-correlation/dw-test.html
index 102949b..c7d6a53 100644
--- a/docs/latest/algorithms/regression/serial-correlation/dw-test.html
+++ b/docs/latest/algorithms/regression/serial-correlation/dw-test.html
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- <h1>Durbin-Watson Test </h1>
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- <h3 id="about">About</h3>
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<p>The <a href="https://en.wikipedia.org/wiki/Durbin%E2%80%93Watson_statistic">Durbin Watson Test</a> is a test for serial correlation
in error terms. The Durbin Watson test statistic <foo>\(d\)</foo> can take values between 0 and 4, and in general</p>
@@ -326,7 +183,7 @@ in error terms. The Durbin Watson test statistic <foo>\(d\)</foo> can take valu
</li>
</ul>
-<p>Implementation is based off of the <code>durbinWatsonTest</code> function in the <a href="https://cran.r-project.org/web/packages/car/index.html"><code>car</code></a> package in R</p>
+<p>Implementation is based off of the <code class="highlighter-rouge">durbinWatsonTest</code> function in the <a href="https://cran.r-project.org/web/packages/car/index.html"><code class="highlighter-rouge">car</code></a> package in R</p>
<h3 id="parameters">Parameters</h3>
@@ -334,15 +191,16 @@ in error terms. The Durbin Watson test statistic <foo>\(d\)</foo> can take valu
<h4 id="r-prototype">R Prototype</h4>
-<pre><code>library(car)
+<div class="highlighter-rouge"><pre class="highlight"><code>library(car)
residuals <- seq(0, 4.9, 0.1)
## perform Durbin-Watson test
durbinWatsonTest(residuals)
</code></pre>
+</div>
<h4 id="in-apache-mahout">In Apache Mahout</h4>
-<pre><code>// A DurbinWatson Test must be performed on a model. The model does not matter.
+<div class="highlighter-rouge"><pre class="highlight"><code>// A DurbinWatson Test must be performed on a model. The model does not matter.
val drmX = drmParallelize( dense((0 until 50).toArray.map( t => Math.pow(-1.0, t)) ) ).t
val drmY = drmX + err1 + 1
var model = new OrdinaryLeastSquares[Int]().fit(drmX, drmY)
@@ -353,35 +211,29 @@ val syntheticResiduals = err1
model = AutocorrelationTests.DurbinWatson(model, syntheticResiduals)
val myAnswer: Double = model.testResults.getOrElse('durbinWatsonTestStatistic, -1.0).asInstanceOf[Double]
</code></pre>
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