Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1733#discussion_r15981438
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/stat/Statistics.scala
---
@@ -89,4 +91,64 @@ object Statistics {
*/
@Experimental
def corr(x: RDD[Double], y: RDD[Double], method: String): Double =
Correlations.corr(x, y, method)
+
+ /**
+ * :: Experimental ::
+ * Conduct Pearson's chi-squared goodness of fit test of the observed
data against the
+ * expected distribution.
+ *
+ * Note: the two input Vectors need to have the same size.
+ * `observed` cannot contain negative values.
+ * `expected` cannot contain nonpositive values.
+ *
+ * @param observed Vector containing the observed categorical
counts/relative frequencies.
+ * @param expected Vector containing the expected categorical
counts/relative frequencies.
+ * `expected` is rescaled if the `expected` sum differs
from the `observed` sum.
+ * @return ChiSquaredTest object containing the test statistic, degrees
of freedom, p-value,
+ * the method used, and the null hypothesis.
+ */
+ @Experimental
+ def chiSqTest(observed: Vector,
+ expected: Vector): ChiSquaredTestResult =
ChiSquaredTest.chiSquared(observed, expected)
+
+ /**
+ * :: Experimental ::
+ * Conduct Pearson's chi-squared goodness of fit test of the observed
data against the uniform
+ * distribution, with each category having an expected frequency of `1 /
observed.size`.
+ *
+ * Note: `observed` cannot contain negative values.
+ *
+ * @param observed Vector containing the observed categorical
counts/relative frequencies.
+ * @return ChiSquaredTest object containing the test statistic, degrees
of freedom, p-value,
+ * the method used, and the null hypothesis.
+ */
+ @Experimental
+ def chiSqTest(observed: Vector): ChiSquaredTestResult =
ChiSquaredTest.chiSquared(observed)
+
+ /**
+ * :: Experimental ::
+ * Conduct Pearson's independence test on the input contingency matrix,
which cannot contain
+ * negative entries or columns or rows that sum up to 0.
+ *
+ * @param counts The contingency matrix.
+ * @return ChiSquaredTest object containing the test statistic, degrees
of freedom, p-value,
+ * the method used, and the null hypothesis.
+ */
+ @Experimental
+ def chiSqTest(counts: Matrix): ChiSquaredTestResult =
ChiSquaredTest.chiSquaredMatrix(counts)
--- End diff --
`counts` -> `observed`? This table could also be probabilities.
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