I thought for minute I had to fight for it. You cannot take naming conventions lightly.
--- Devon McCormick <[EMAIL PROTECTED]> wrote: > Sorry to be a pain, but could the suffixes be changed to "p" for population > instead of "b"? This would mimic how it's done in Excel (and may be > otherwise more conventional?) > > On 1/15/08, Chris Burke <[EMAIL PROTECTED]> wrote: > > > > Devon McCormick wrote: > > > Would it be possible to include biased (population) versions of the > > common > > > statistical functions in "statfns.ijs"? > > > > > > One reason I'm asking is that I often work with Excel and it has biased > > (eg > > > VARP) versus unbiased (eg VAR) versions of many functions. > > > > > > I've just spent some time figuring out that the reason the J "cov" verb > > does > > > not agree with Excel's "COVAR" is because Excel (inconsistently?) uses > > the > > > biased measure by default and J defaults to the unbiased one. > > > > > > So, would it be helpful to have something like the following included in > > the > > > standard distribution of statfns in the future or can someone tell me > > why > > > Excel is being silly? > > > > > > varB=: (ssdev % #) NB. biased variance > > > stddevB=: %: @ varB NB. biased standard deviation > > > covB=: (spdev % # @ ]) NB. biased covariance=Excel > > > > I added these to the latest beta scripts (6.02.012). Note names are all > > lowercase as is standard in the library: > > > > varb=: ssdev % # > > stddevb=: %: @ varb > > covb=: spdev % # @ ] > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > -- > Devon McCormick, CFA > ^me^ at acm. > org is my > preferred e-mail > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
