On 19 Aug 2003 at 10:15, Christoph Lehmann wrote: > Dear R-pros > > I have a problem, for which usually I would apply a chisq.test or a > fisher.test: >
try ?chisq.test which tells you you can say chisq.test(..., sim=TRUE, B=20000) and the simulation will be very fast! Kjetil Halvorsen > > > 40 objects, each given either a "0" or "1", regarding if this object > later on will be remembered by a subject or not. > > 7 subjects investigated > > means: we have a 2x40 matrix, each cell the number of subjects for who > the object i has been given either "0" or "1" e.g. > > objects: > 1 1 3 39 40 > ------------------------------------------ > "0" 1 2 2 .. 7 7 > "1" 4 4 5 .. 0 0 > > over all 40 objects, we have 67% of "1" and 33% of "0" > > I want to know, if for the 40 objects, the ratio of "0"/"1" differs or > not, i.e. if they have the same distribution. > > I cannot use a chisq.test since the expected frequencies are < 5 for the > "0" cells. > > Fisher.test seems to run for > 12h on a PIV 1.8GHz... > > what do you recommend me to do? > > Many thanks > > Christoph > -- > > recognition > [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14] > [1,] 1 2 2 2 2 3 3 3 3 3 3 3 4 4 > [2,] 4 4 5 4 4 3 4 4 4 4 3 4 3 3 > [,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [,24] [,25] [,26] > [1,] 4 4 4 4 4 4 5 5 5 5 5 5 > [2,] 3 2 3 3 2 3 2 2 2 2 2 2 > [,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34] [,35] [,36] [,37] [,38] > [1,] 5 5 5 5 5 6 6 6 6 6 6 6 > [2,] 2 2 2 2 2 1 1 1 1 1 1 1 > [,39] [,40] > [1,] 7 7 > [2,] 0 0 > > > fisher.test(recognition) > > > -- > Christoph Lehmann <[EMAIL PROTECTED]> > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
