Dear Christian, The Rcmdr assumes that you have a data frame with the original data, in which the variable in question is a factor. The frequency distribution is constructed for the factor. Thus, in your example, you'd have 100 observations classified on a two-category factor. What you enter directly are the hypothesized probabilities.
I hope this helps, John -------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario Canada L8S 4M4 905-525-9140x23604 http://socserv.mcmaster.ca/jfox -------------------------------- > -----Original Message----- > From: Christian Jost [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 15, 2005 11:38 AM > To: John Fox; 'Philippe Grosjean' > Cc: r-help@stat.math.ethz.ch > Subject: RE: [R] Rcommander and simple chisquare > > Dear John and Philippe, > > thanks for your replys, I finally found this menu, but I am > somewhat at a loss how I should enter the observed > frequencies. To take my example below, If I enter a > one-column data.frame with the numbers 61 and 39, John's > indicated menu is not highlighted. If I add a second column > containing some factor, the menu is highlighted by I cannot > select the first column. However, if I edit the data and > declare the first column to be of type 'character' I can > select it in the menu dialog and declare the expected > frequencies, but the chisquare output doesn't make any sense. > For the moment I cannot make any sense of that :-( Any help > most appreciated, or a link to the tutorial/faq that explains > such kind of problems. > > Thanks, Christian. > > At 11:31 -0400 15/09/05, John Fox wrote: > >Dear Philippe, > > > >This does a chi-square test of independence in a contingency > table, not > >a chi-square goodness-of-fit test (which is done in the Rcmdr via > >Statistics > >-> Summaries -> Frequency distribution). > > > >Regards, > > John > > > >-------------------------------- > >John Fox > >Department of Sociology > >McMaster University > >Hamilton, Ontario > >Canada L8S 4M4 > >905-525-9140x23604 > >http://socserv.mcmaster.ca/jfox > >-------------------------------- > > > >> -----Original Message----- > >> From: [EMAIL PROTECTED] > >> [mailto:[EMAIL PROTECTED] On Behalf Of Philippe > >> Grosjean > >> Sent: Thursday, September 15, 2005 7:32 AM > >> To: Christian Jost > >> Cc: r-help@stat.math.ethz.ch > >> Subject: Re: [R] Rcommander and simple chisquare > >> > >> Hello, > >> > >> Just look at Statistics -> Contingency tables. There is > an option > >> for making the chi square test there. > >> Best, > >> > >> Philippe Grosjean, > >> > >> ..............................................<°}))><........ > >> ) ) ) ) ) > > > ( ( ( ( ( Prof. Philippe Grosjean > > > .............................................................. > >> > >> Christian Jost wrote: > >> > In this years biostat teaching I will include Rcommander (it > >> indeed > simplifies syntax problems that makes students > frequently > >> miss the > core statistical problems). But I could not > find how to > >> make a simple > chisquare comparison between observed frequencies > >> and expected > frequencies (eg in genetics where you expect > >> phenotypic frequencies > corresponding to 3:1 in standard > >> dominant/recessif alleles). Any idea > where this > feature might be > >> hidden? Or could it be added to > Rcommander? > >> > > >> > Thanks, Christian. > >> > > >> > ps: in case I am not making myself clear, can > Rcommander be made > >> to > perform > >> chisq.test(c(61,39),p=c(0.75,0.25)) > >> > > >> > > > > > ______________________________________________ > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html