Fix Yates correction according to erratum http://www.oreilly.com/cs/p…

…ortal/edit/errata/153680
masoomalam · May 17, 2015 · d4ba78a · d4ba78a
1 parent c26af07
commit d4ba78a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ch07-graph/src/main/scala/com/cloudera/datascience/graph/RunGraph.scala b/ch07-graph/src/main/scala/com/cloudera/datascience/graph/RunGraph.scala
@@ -217,7 +217,7 @@ object RunGraph extends Serializable {
     val YN = YA - YY
     val NY = YB - YY
     val NN = T - NY - YN - YY
-    val inner = (YY * NN - YN * NY) - T / 2.0
+    val inner = math.abs(YY * NN - YN * NY) - T / 2.0
     T * math.pow(inner, 2) / (YA * NA * YB * NB)
   }
 }