Short answer: supporting some kind of variance calculation was considered and discussed by the Lambda expert group:
http://mail.openjdk.java.net/pipermail/lambda-libs-spec-experts/2013-March/001523.html but since the well-known the formula you cite as-is fails catastrophically for floating-point numbers and the numerical remedies for roundoff problems are expensive enough that you don't want to do them all the time. -Joe On Mon, Mar 17, 2014 at 10:55 PM, clay <claytonw...@gmail.com> wrote: > Why does jdk 8 java.util.DoubleSummaryStatistics not track variance or > standard deviation? > > It provides mean, min, max, count, sum... But no variance? That's the > other major statistic that can be calculated trivially by Var(X) = E[X^2] - > (E[X])^2 > > Java 8 hits final release today, right? > > -- > You received this message because you are subscribed to the Google Groups > "Java Posse" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to javaposse+unsubscr...@googlegroups.com. > To post to this group, send email to javaposse@googlegroups.com. > Visit this group at http://groups.google.com/group/javaposse. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Java Posse" group. To unsubscribe from this group and stop receiving emails from it, send an email to javaposse+unsubscr...@googlegroups.com. To post to this group, send email to javaposse@googlegroups.com. Visit this group at http://groups.google.com/group/javaposse. For more options, visit https://groups.google.com/d/optout.
