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Re: mean and sdev [message #11127 is a reply to message #11069]

Tue, 10 March 1998 00:00

Alejandro C. Frery
Messages: 2
Registered: March 1998

Junior Member

Hi,

Though David's reply (the use of MOMENT) function is perfectly correct, that
function computes moments up to the fourth order, since it returns the mean,
the variance, the skewness and the kurtosis. If you only want the mean and
standard deviation, my suggestion is use the STDEV function (hidden and
undocumented, I do not know why) .

x = RANDOMU(seed, 1000)
std = STDEV(x, m) ; std will store the sample standard deviation and m the
sample mean (optional)
PRINT, std, m

Cheers,

Alejandro
Alejandro C. Frery UFPE-DI Recife, PE, Brazil
www.di.ufpe.br/~frery

R. Bauer escreveu na mensagem <34F95952.35B20DF0@fz-juelich.de>...
Hi,
I 'd like to know if a build in function somewhere is available to get
means and standard deviations.

I know
it's easy to do something like this:
mean = total(a)/n_elements(a)
but for 100000 values it takes a lot of my time.

Any ideas?

R. Bauer

--
R.Bauer

Institut fuer Stratosphaerische Chemie (ICG-1)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de

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[Message index]

		Re: mean and sdev By: Martin Schultz on Tue, 03 March 1998 00:00
		Re: mean and sdev By: Alejandro C. Frery on Tue, 10 March 1998 00:00
		Re: mean and sdev By: Dr. G. Scott Lett on Mon, 02 March 1998 00:00
		Re: mean and sdev By: wmc on Mon, 02 March 1998 00:00
		Re: mean and sdev By: davidf on Sun, 01 March 1998 00:00

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