Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2928#discussion_r19368747
--- Diff: core/src/main/scala/org/apache/spark/partial/StudentTCacher.scala
---
@@ -35,7 +37,8 @@ private[spark] class StudentTCacher(confidence: Double) {
} else {
val size = sampleSize.toInt
if (cache(size) < 0) {
- cache(size) = Probability.studentTInverse(1 - confidence, size - 1)
+ val tDist = new TDistribution(size - 1)
+ cache(size) = tDist.inverseCumulativeProbability(1 - (1 -
confidence) / 2)
--- End diff --
Thanks for the comment! This is helpful.
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