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 <[email protected]> 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 [email protected]. > To post to this group, send email to [email protected]. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/javaposse. For more options, visit https://groups.google.com/d/optout.
