Re: [R] R and SAS proc format
The down side to R's factor solution: The numerical values of factors are always 1 to number of levels. Thus, it can be tough and requires great care to work with studies that have both numerical values different from this and value labels. This situation is currently not well-supported by R. Regards, Ulrike P.S.: I fully agree with Frank regarding the annoyance one sometimes encounters with formats in SAS! You can add an attribute to a variable. In the sas.get function in the Hmisc package for example, when importing SAS variables that have PROC FORMAT value labels, an attribute 'sas.codes' keeps the original codes; these can be retrieved using sas.codes(variable name). This could be done outside the SAS import context also. Frank -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University Frank, are these attributes preserved when merging or subsetting a data frame? Are they used in R packages other than Hmisc and Design (e.g. in a simple table request)? If this is the case, my wishlist items 8658 and 8659 (http://bugs.r-project.org/cgi-bin/R/wishlist?id=8658;user=guest, http://bugs.r-project.org/cgi-bin/R/wishlist?id=8659;user=guest) can be closed. Otherwise, I maintain the opinion that there are workarounds but that R is not satisfactorily able to handle this type of data. Regards, Ulrike --- End of Original Message --- [[alternative HTML version deleted]] __ 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] R and SAS proc format
Ulrike Grömping wrote: The down side to R's factor solution: The numerical values of factors are always 1 to number of levels. Thus, it can be tough and requires great care to work with studies that have both numerical values different from this and value labels. This situation is currently not well-supported by R. Regards, Ulrike P.S.: I fully agree with Frank regarding the annoyance one sometimes encounters with formats in SAS! You can add an attribute to a variable. In the sas.get function in the Hmisc package for example, when importing SAS variables that have PROC FORMAT value labels, an attribute 'sas.codes' keeps the original codes; these can be retrieved using sas.codes(variable name). This could be done outside the SAS import context also. Frank -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University Frank, are these attributes preserved when merging or subsetting a data frame? Are they used in R packages other than Hmisc and Design (e.g. in a simple table request)? no; would need to add functions like those that are used by the Hmisc label or impute functions. And they are not used outside Hmisc/Design. In fact I have little need for them as I always find the final labels as the key to analysis. If this is the case, my wishlist items 8658 and 8659 (http://bugs.r-project.org/cgi-bin/R/wishlist?id=8658;user=guest, http://bugs.r-project.org/cgi-bin/R/wishlist?id=8659;user=guest) can be closed. Otherwise, I maintain the opinion that there are workarounds but that R is not satisfactorily able to handle this type of data. R gives the framework for doing this elegantly but the user has an overhead of implementing new methods for such attributes. Cheers Frank Regards, Ulrike *--- End of Original Message ---* -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University __ 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] R and SAS proc format
Jason Barnhart wrote: - Original Message - From: John Kane [EMAIL PROTECTED] To: lamack lamack [EMAIL PROTECTED]; R-help@stat.math.ethz.ch Sent: Tuesday, March 06, 2007 2:13 PM Subject: Re: [R] R and SAS proc format --- lamack lamack [EMAIL PROTECTED] wrote: Dear all, Is there an R equivalent to SAS's proc format? What does the SAS PROC FORMAT do? It formats or reformats data in the SAS system. Slightly more precisely: It creates user-defined formats, which are subsequently associated with variables and used for reading, printing, tabulating, and analyzing data. It is akin to R's factor() constructions, but not quite. For one thing, SAS's formats are separate entities - same format can be used for many variables, whereas R's factors have the formatting coded as a part of the object. For related reasons, a variable in SAS can have more distinct values than there are value labesl for, etc. It looks this: proc format; value kanefmt 1='A' 2='B' 3='C' 4='X' 5='Throw me out'; data temp; do i=1 to 10; kanevar=put(i,kanefmt.); output; end; proc print; run; And produces this: Obs i kanevar 1 1A 2 2B 3 3C 4 4X 5 5Throw me out 6 6 6 7 7 7 8 8 8 9 9 9 1010 10 But it is more robust than what is shown here. __ 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. -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ 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] R and SAS proc format
On 3/7/07, Peter Dalgaard [EMAIL PROTECTED] wrote: Jason Barnhart wrote: - Original Message - From: John Kane [EMAIL PROTECTED] To: lamack lamack [EMAIL PROTECTED]; R-help@stat.math.ethz.ch Sent: Tuesday, March 06, 2007 2:13 PM Subject: Re: [R] R and SAS proc format --- lamack lamack [EMAIL PROTECTED] wrote: Dear all, Is there an R equivalent to SAS's proc format? What does the SAS PROC FORMAT do? It formats or reformats data in the SAS system. Slightly more precisely: It creates user-defined formats, which are subsequently associated with variables and used for reading, printing, tabulating, and analyzing data. It is akin to R's factor() constructions, but not quite. For one thing, SAS's formats are separate entities - same format can be used for many variables, whereas R's factors have the formatting coded as a part of the object. For related reasons, a variable in SAS can have more distinct values than there are value labesl for, etc. It looks this: proc format; value kanefmt 1='A' 2='B' 3='C' 4='X' 5='Throw me out'; data temp; do i=1 to 10; kanevar=put(i,kanefmt.); output; end; proc print; run; And produces this: Obs i kanevar 1 1A 2 2B 3 3C 4 4X 5 5Throw me out 6 6 6 7 7 7 8 8 8 9 9 9 1010 10 But it is more robust than what is shown here. __ 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. -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ 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. Also, SAS formats are used as a (somewhat cumbersome) replacement for dictionary data structures. Starting from SAS 9.1 (I believe), hash tables can be used within data steps for the same purpose (albeit still cumbersome). In this regard, not only formats but also lists could be a replacement for them. They can be used as a way to get key-value mappings. These key-value mappings (I mean, these kind of data structures) are very handy tools. I have used both factors and lists for some kind of ad hoc replacement for these data structures. Hasn't anybody considered the posibility of having these data structures implemented in R in a much python-like or java-like touch and feel? Regards, Carlos J. Gil Bellosta http://www.datanalytics.com __ 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] R and SAS proc format
Dear all, Is there an R equivalent to SAS's proc format? Best regards J. Lamack _ O Windows Live Spaces é seu espaço na internet com fotos (500 por mês), blog e agora com rede social http://spaces.live.com/ __ 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] R and SAS proc format
See ?cut for continuous variables, and ?factor, ?levels for the others. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of lamack lamack Sent: Tuesday, March 06, 2007 12:49 PM To: R-help@stat.math.ethz.ch Subject: [R] R and SAS proc format Dear all, Is there an R equivalent to SAS's proc format? Best regards J. Lamack _ O Windows Live Spaces é seu espaço na internet com fotos (500 por mês), blog e agora com rede social http://spaces.live.com/ __ 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] R and SAS proc format
The down side to R's factor solution: The numerical values of factors are always 1 to number of levels. Thus, it can be tough and requires great care to work with studies that have both numerical values different from this and value labels. This situation is currently not well-supported by R. Regards, Ulrike P.S.: I fully agree with Frank regarding the annoyance one sometimes encounters with formats in SAS! lamack lamack wrote: Dear all, Is there an R equivalent to SAS's proc format? Best regards J. Lamack _ O Windows Live Spaces é seu espaço na internet com fotos (500 por mês), blog e agora com rede social http://spaces.live.com/ __ 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. -- View this message in context: http://www.nabble.com/R-and-SAS-proc-format-tf3357624.html#a9340323 Sent from the R help mailing list archive at Nabble.com. __ 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] R and SAS proc format
lamack lamack wrote: Dear all, Is there an R equivalent to SAS's proc format? Best regards J. Lamack Fortunately not. SAS is one of the few large systems that does not implicitly support value labels and that separates label information from the database [I can't count the number of times someone has sent me a SAS dataset and forgotten to send the PROC FORMAT value labels]. See the factor function for information about how R does this. Frank Harrell -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University __ 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] R and SAS proc format
--- lamack lamack [EMAIL PROTECTED] wrote: Dear all, Is there an R equivalent to SAS's proc format? What does the SAS PROC FORMAT do? __ 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] R and SAS proc format
Ulrike Grömping wrote: The down side to R's factor solution: The numerical values of factors are always 1 to number of levels. Thus, it can be tough and requires great care to work with studies that have both numerical values different from this and value labels. This situation is currently not well-supported by R. You can add an attribute to a variable. In the sas.get function in the Hmisc package for example, when importing SAS variables that have PROC FORMAT value labels, an attribute 'sas.codes' keeps the original codes; these can be retrieved using sas.codes(variable name). This could be done outside the SAS import context also. Frank Regards, Ulrike P.S.: I fully agree with Frank regarding the annoyance one sometimes encounters with formats in SAS! lamack lamack wrote: Dear all, Is there an R equivalent to SAS's proc format? Best regards J. Lamack _ O Windows Live Spaces é seu espaço na internet com fotos (500 por mês), blog e agora com rede social http://spaces.live.com/ __ 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. -- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University __ 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] R and SAS proc format
- Original Message - From: John Kane [EMAIL PROTECTED] To: lamack lamack [EMAIL PROTECTED]; R-help@stat.math.ethz.ch Sent: Tuesday, March 06, 2007 2:13 PM Subject: Re: [R] R and SAS proc format --- lamack lamack [EMAIL PROTECTED] wrote: Dear all, Is there an R equivalent to SAS's proc format? What does the SAS PROC FORMAT do? It formats or reformats data in the SAS system. It looks this: proc format; value kanefmt 1='A' 2='B' 3='C' 4='X' 5='Throw me out'; data temp; do i=1 to 10; kanevar=put(i,kanefmt.); output; end; proc print; run; And produces this: Obs i kanevar 1 1A 2 2B 3 3C 4 4X 5 5Throw me out 6 6 6 7 7 7 8 8 8 9 9 9 1010 10 But it is more robust than what is shown here. __ 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.
