Re: [R] Incomplete output with `sn' library package
The derived information matrix is not of full rank for your data. See the code of the functions, which is not that hard to read. Uwe Ligges MANASI VYDYANATH wrote: You have my sincere apologies for the incompleteness of my message. I have given the details below, including my dataset and my code. I'm using R, version 2.5.0. My OS is a Mac, (version Tiger). The sn package is Version 0.4-1 My code was as follows: mydata - read.table(url(http://www.statsci.org/data/oz/ ais.txt), header = T) attach(mydata) a - msn.fit(X = cbind(1,Ht,Wt), y = BMI, control = list(x.tol=1e-6)) b - msn.mle(X=cbind(1,Ht,Wt), y=SSF) a b My problem is that neither the a nor the b output gives me any standard errors - those should appear under $se. In both the regressions, this field is left blank with NA under it. I would appreciate some help on this matter - are the standard errors not supposed to appear here, or is there something else I should put into the inputs? Thank you once again for your time, Manasi On Aug 30, 2007, at 5:47 AM, Uwe Ligges wrote: MANASI VYDYANATH wrote: Dear R users: I have a question regarding the output for two of the functions in the `sn' package, which deals with the mle fitting of skew normal curves to linear regressions. I'm using the examples and the dataset given as an example in the online documentation for this package, for the functions `msn.fit' and `msn.mle'. I'm following the example code in the documentation for these two functions exactly. Part of the data output is supposed to be se, which gives the standard errors of the estimated coefficients. This particular value comes out as being NA in the examples given, but there are three coefficients in each case and no numerical problems about why the standard errors cannot be calculated. Am I setting this program up right? Is there some other command I should use (or an option I need to use) to get the output to display standard errors of the coefficients? We cannot know if you use it right, since you have not given any details on OS, R version, sn version, and particularly a reproducible example. As each R-help message tells in the footer: PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. Uwe Ligges Thank you for your time in reading this question - Cordially, Manasi __ 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 and provide commented, minimal, self-contained, reproducible code. __ 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 and provide commented, minimal, self-contained, reproducible code. __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Incomplete output with `sn' library package
MANASI VYDYANATH wrote: Dear R users: I have a question regarding the output for two of the functions in the `sn' package, which deals with the mle fitting of skew normal curves to linear regressions. I'm using the examples and the dataset given as an example in the online documentation for this package, for the functions `msn.fit' and `msn.mle'. I'm following the example code in the documentation for these two functions exactly. Part of the data output is supposed to be se, which gives the standard errors of the estimated coefficients. This particular value comes out as being NA in the examples given, but there are three coefficients in each case and no numerical problems about why the standard errors cannot be calculated. Am I setting this program up right? Is there some other command I should use (or an option I need to use) to get the output to display standard errors of the coefficients? We cannot know if you use it right, since you have not given any details on OS, R version, sn version, and particularly a reproducible example. As each R-help message tells in the footer: PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Uwe Ligges Thank you for your time in reading this question - Cordially, Manasi __ 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 and provide commented, minimal, self-contained, reproducible code. __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Incomplete output with `sn' library package
You have my sincere apologies for the incompleteness of my message. I have given the details below, including my dataset and my code. I'm using R, version 2.5.0. My OS is a Mac, (version Tiger). The sn package is Version 0.4-1 My code was as follows: mydata - read.table(url(http://www.statsci.org/data/oz/ ais.txt), header = T) attach(mydata) a - msn.fit(X = cbind(1,Ht,Wt), y = BMI, control = list(x.tol=1e-6)) b - msn.mle(X=cbind(1,Ht,Wt), y=SSF) a b My problem is that neither the a nor the b output gives me any standard errors - those should appear under $se. In both the regressions, this field is left blank with NA under it. I would appreciate some help on this matter - are the standard errors not supposed to appear here, or is there something else I should put into the inputs? Thank you once again for your time, Manasi On Aug 30, 2007, at 5:47 AM, Uwe Ligges wrote: MANASI VYDYANATH wrote: Dear R users: I have a question regarding the output for two of the functions in the `sn' package, which deals with the mle fitting of skew normal curves to linear regressions. I'm using the examples and the dataset given as an example in the online documentation for this package, for the functions `msn.fit' and `msn.mle'. I'm following the example code in the documentation for these two functions exactly. Part of the data output is supposed to be se, which gives the standard errors of the estimated coefficients. This particular value comes out as being NA in the examples given, but there are three coefficients in each case and no numerical problems about why the standard errors cannot be calculated. Am I setting this program up right? Is there some other command I should use (or an option I need to use) to get the output to display standard errors of the coefficients? We cannot know if you use it right, since you have not given any details on OS, R version, sn version, and particularly a reproducible example. As each R-help message tells in the footer: PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. Uwe Ligges Thank you for your time in reading this question - Cordially, Manasi __ 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 and provide commented, minimal, self-contained, reproducible code. __ 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 and provide commented, minimal, self-contained, reproducible code.
