[R] Rcommander and simple chisquare
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
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 ) ) ) ) ) ( ( ( ( (Numerical Ecology of Aquatic Systems ) ) ) ) ) Mons-Hainaut University, Pentagone (3D08) ( ( ( ( (Academie Universitaire Wallonie-Bruxelles ) ) ) ) ) 8, av du Champ de Mars, 7000 Mons, Belgium ( ( ( ( ( ) ) ) ) ) phone: + 32.65.37.34.97, fax: + 32.65.37.30.54 ( ( ( ( (email: [EMAIL PROTECTED] ) ) ) ) ) ( ( ( ( (web: http://www.umh.ac.be/~econum ) ) ) ) ) http://www.sciviews.org ( ( ( ( ( .. 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 __ 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
Re: [R] Rcommander and simple chisquare
Dear Christian, From the Rcmdr menus, select Statistics - Summaries - Frequency distributions, and check the Chisquare goodness of fit test box in the resulting dialog. This will bring up a dialog box where you can enter hypothesized probabilities from which expected frequencies will be calculated. 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 Christian Jost Sent: Thursday, September 15, 2005 5:40 AM To: r-help@stat.math.ethz.ch Subject: [R] Rcommander and simple chisquare 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 __ 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
Re: [R] Rcommander and simple chisquare
Dear Christian, From the Rcmdr menus, select Statistics - Summaries - Frequency distributions, and check the Chisquare goodness of fit test box in the resulting dialog. This will bring up a dialog box where you can enter hypothesized probabilities from which expected frequencies will be calculated. 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 Christian Jost Sent: Thursday, September 15, 2005 5:40 AM To: r-help@stat.math.ethz.ch Subject: [R] Rcommander and simple chisquare 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 __ 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
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
Re: [R] Rcommander and simple chisquare
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
