[R] test for two samples

kjetil brinchmann halvorsen kjetil at entelnet.bo
Tue Feb 4 18:19:03 CET 2003

On 4 Feb 2003 at 15:27, Rado Bonk wrote:

You should really give more details, i.e. which model
did you fit? If it is a linear model with intercept, the residuals
theoretically have sum zero, and for a non-linear model the
sum should be close to zero. Comparing means of residuals
doesn't seem to make much sense.

Kjetil Halvorsen

> Hi R-users,
> My question is more methodological one, rather than technical.
> I have to samples representing residuals based on two measurements 
> techniques (resid1,resid2; n=69). I need to compare two samples, to 
> reject one technique (the worse one), and to keep the one which gave 
> lower residuals (better one). What to look for? What should I analyse? 
> Means, variance, std. deviations?
> Based on preliminary EDA:
> mean_resid1 < mean_resid2	#I would reject resid2 technique
> stdev_resid1 > stdev_resid2	#I would reject resid1 technique
> var_resid1 > var_resid2		#I would reject resid1 technique
> Based on means I would reject resid2 technique, but based on analyses of 
> stdev. and variance I would reject resid1 technique.
> How to deal with that problem? What is proper statist. atrribute to look 
> for? Should I use t.test()?
> Best regards,
> Rado Bonk
> -- 
> Radoslav Bonk M.S.
> Dept. of Physical Geography and Geoecology
> Faculty of Sciences, Comenius University
> Mlynska Dolina 842 15, Bratislava, SLOVAKIA
> tel: +421 905 968 127 e-mail: rbonk at host.sk
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