print Coefficient of Variation，CV

src/main/scala/com/gmei/data/dq/pvCheker.scala

@@ -87,6 +87,10 @@ object pvCheker {
     println(summary.mean)  // a dense vector containing the mean value for each column
     println(summary.variance)  // column-wise variance
     println(summary.numNonzeros)  // number of nonzeros in each column
-  }
 
+    println("Coefficient of Variation，CV")
+    for (i <- 1 to summary.mean.size) {
+      println(summary.variance(i) / summary.mean(i))
+    }
+  }
 }