A feature request has been raised on GitHub https://github.com/Jermolene/TiddlyWiki5/issues/4431
But I appreciate if anybody has idea to calculate the STD using the current math operators. --Mohammad On Friday, January 31, 2020 at 1:02:01 PM UTC+3:30, Mohammad wrote: > > Using the current status of mathematical operation supported by Tiddlywiki > 5.1.21+ and without using third party plugins > is there any way to calculate the standard deviation? > > > [image: std.png] > > > > Use case: > > I have a tiddler per student and these tiddler have a field called score > which keep the student score. I wish to calculate the class standard > deviation for this course scores. > > Ref: > https://tiddlywiki.com/#Mathematics%20Operators > https://en.wikipedia.org/wiki/Standard_deviation > > > I can calculate the average or mean (mu in the above picture, the formula > at the right) > > \define mean(filter) > <$vars > xcount ={{{ [subfilter<__filter__>count[]] }}} > xsum ={{{ [subfilter<__filter__>sum[]] }}} > > <$text text={{{ [<xsum>divide<xcount>] }}}/> > </$vars> > \end > > For example > > mean: <<mean filter:"[tag[student]has[score]get[score]]">> > > --Mohammad > > p.s: > If TW supports power operator like "1 2 +[power[2]" and "1 2 > +[power[0.5]]" then it was straight forward to compute the standard > deviation. > So, the question may be how implement fractional and complete power in TW > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/79fddf0e-bd33-4be6-a530-e2fc73034ced%40googlegroups.com.
