{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/67822629","id":67822629,"diff_hunk":"@@ -47,12 +47,12 @@ class DoubleRDDFunctions(self: RDD[Double]) extends Logging with Serializable {\n     stats().mean\n   }\n \n-  /** Compute the variance of this RDD's elements. */\n+  /** Compute the population variance of this RDD's elements. */\n   def variance(): Double = self.withScope {\n     stats().variance\n   }\n \n-  /** Compute the standard deviation of this RDD's elements. */\n+  /** Compute the population standard deviation of this RDD's elements. */\n   def stdev(): Double = self.withScope {","path":"core/src/main/scala/org/apache/spark/rdd/DoubleRDDFunctions.scala","position":12,"original_position":12,"commit_id":"15938b38e1a76be2dd4f749e72084568af9c9600","original_commit_id":"15938b38e1a76be2dd4f749e72084568af9c9600","user":{"login":"srowen","id":822522,"avatar_url":"https://avatars.githubusercontent.com/u/822522?v=3","gravatar_id":"","url":"https://api.github.com/users/srowen","html_url":"https://github.com/srowen","followers_url":"https://api.github.com/users/srowen/followers","following_url":"https://api.github.com/users/srowen/following{/other_user}","gists_url":"https://api.github.com/users/srowen/gists{/gist_id}","starred_url":"https://api.github.com/users/srowen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/srowen/subscriptions","organizations_url":"https://api.github.com/users/srowen/orgs","repos_url":"https://api.github.com/users/srowen/repos","events_url":"https://api.github.com/users/srowen/events{/privacy}","received_events_url":"https://api.github.com/users/srowen/received_events","type":"User","site_admin":false},"body":"One last tweak: these methods should call the \"pop\" equivalents rather than implement the same thing twice, even though it's so simple.","created_at":"2016-06-21T07:54:21Z","updated_at":"2016-06-21T07:54:21Z","html_url":"https://github.com/apache/spark/pull/13403#discussion_r67822629","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/13403","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/67822629"},"html":{"href":"https://github.com/apache/spark/pull/13403#discussion_r67822629"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/13403"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/13403","id":71959961,"html_url":"https://github.com/apache/spark/pull/13403","diff_url":"https://github.com/apache/spark/pull/13403.diff","patch_url":"https://github.com/apache/spark/pull/13403.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/13403","number":13403,"state":"open","locked":false,"title":"[SPARK-15660][CORE] Update RDD `variance/stdev` description and add popVariance/popStdev","user":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nIn Spark-11490, `variance/stdev` are redefined as the **sample** `variance/stdev` instead of population ones. This PR updates the other old documentations to prevent users from misunderstanding. This will update the following Scala/Java API docs.\r\n\r\n- http://spark.apache.org/docs/2.0.0-preview/api/scala/index.html#org.apache.spark.api.java.JavaDoubleRDD\r\n- http://spark.apache.org/docs/2.0.0-preview/api/scala/index.html#org.apache.spark.rdd.DoubleRDDFunctions\r\n- http://spark.apache.org/docs/2.0.0-preview/api/scala/index.html#org.apache.spark.util.StatCounter\r\n- http://spark.apache.org/docs/2.0.0-preview/api/java/org/apache/spark/api/java/JavaDoubleRDD.html\r\n- http://spark.apache.org/docs/2.0.0-preview/api/java/org/apache/spark/rdd/DoubleRDDFunctions.html\r\n- http://spark.apache.org/docs/2.0.0-preview/api/java/org/apache/spark/util/StatCounter.html\r\n\r\nAlso, this PR adds them `popVariance` and `popStdev` functions clearly.\r\n\r\n## How was this patch tested?\r\n\r\nPass the updated Jenkins tests.","created_at":"2016-05-31T05:25:14Z","updated_at":"2016-06-21T07:54:21Z","closed_at":null,"merged_at":null,"merge_commit_sha":"68e295a5989f79e7b3020d396eb240c0fac2acb4","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/13403/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/13403/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/13403/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/15938b38e1a76be2dd4f749e72084568af9c9600","head":{"label":"dongjoon-hyun:SPARK-15660","ref":"SPARK-15660","sha":"15938b38e1a76be2dd4f749e72084568af9c9600","user":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"repo":{"id":28900400,"name":"spark","full_name":"dongjoon-hyun/spark","owner":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/dongjoon-hyun/spark","description":"Mirror 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