statistics standard deviation

[navyfalcon]

What is a better way to write the formula for standard deviation
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sum(25;24;23;22;20;18;17;16;14;10;8)
197
ss=ans
ss=197
n=11
m=ss/n
m=17.9090...91
sum((25-m)^2;(24-m)^2);(23-m)^2;...;(8-m)^2)
314.9090...91
var=ans
31.49090...91
sqrt(var)
5.61167...
StdDev=ans
-
how can I obtain the number of items in a list with the calculator
(ie sample size ... or n) without manually counting.
-
my website showing SpeedCrunch 'plane geometry'
http://freetutorials.name/Reference1/SpeedCrunch_Ex.html
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Thank You
falcon

[Helder Correia]

On Wed, Jun 8, 2011 at 18:39, navyfalcon <navyf...@yahoo.com> wrote:
> What is a better way to write the formula for standard deviation

I just added support for built-in stddev function, thanks to Enrico
Ros. Will be included in version in 0.11.

> how can I obtain the number of items in a list with the calculator
> (ie sample size ... or n) without manually counting.

Not possible, I'm afraid. I definitely want to add (or get a patch
from someone) to add support to data sets (or lists, or whatever you
call it).

> my website showing SpeedCrunch 'plane geometry'
> http://freetutorials.name/Reference1/SpeedCrunch_Ex.html

Thanks!