[R] person-level to person-period xfm
Dear R experts, I have a so-called person-level data frame that I need to transform into a person-period data frame. If the lingo is unclear, the data have one row for each subject, with repeated measures data each in a separate column. I need to transform these data so that each subject has multiple rows, one for each repeated measure value. Is there a quick-and-dirty way to do this transformation? Many thanks, -- Robert Terwilliger Biomedical Physicist Laboratory of Neurocognitive Development Western Psychiatric Institute and Clinic University of Pittsburgh Medical Center Loeffler Building 121 Meyran Avenue #114 Pittsburgh, PA 15213 412.383.8174 - Office 412.383.8179 - Fax em: rater...@gmail.com http://www.wpic.pitt.edu/research/lncd/ __ R-help@r-project.org 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] structural equation modeling
Dear R-help, I am interested in using structural equation modeling. Just getting started with it, but I'm looking for suggestions for packages. As an aside, what's the best way for looking for packages at CRAN? -- Robert Terwilliger Biomedical Physicist Laboratory of Neurocognitive Development Western Psychiatric Institute and Clinic University of Pittsburgh Medical Center Loeffler Building 121 Meyran Avenue #114 Pittsburgh, PA 15213 412.383.8174 - Office 412.383.8179 - Fax em: rater...@gmail.com http://www.wpic.pitt.edu/research/lncd/ __ R-help@r-project.org 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 with longitudinal data plot
Dear R Help, I am attempting to make a plot of longitudinal data, a sample data frame of which is shown below. I'd like to show all of the subjects in the same plot, with a set of connecting line segments for each subject. 'age' would be the x-axis and 'score' would be the y-axis. subject age score 1 10123 12 51.06 2 10123 14 50.00 3 10123 15 62.22 4 10124 12 74.42 5 10124 13 72.73 6 10124 14 63.41 7 10125 16 54.55 8 10125 17 50.00 9 10125 18 54.35 1010128 17 97.83 1110128 18 97.87 1210128 19 100.00 ... Any help would be appreciated. Regards, Robert Terwilliger __ R-help@r-project.org 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^2 for SSasymp?
Dear R Help, At the risk of sounding naïve, is there a way for obtaining something resembling an r^2 value for the fit obtained using SSasymp? I have read ?SSasymp and looked through the archives but to no avail. Many thanks, Robert Terwilliger __ R-help@r-project.org 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] binning data
I would like to 'bin' a vector of of values (10 values) in much the same way as 'hist' does for plotting, but I just want a result with the bins and the frequencies. Is there a 'quick and dirty' (built-in) way to do this, or do I need to write some code? Many thanks, Robert Terwilliger __ R-help@r-project.org 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] OS X binary: 32 or 64-bit?
Dear R Experts, I am using R.app (the Mac OS X binary) for neuroimage analysis, so I am loading in some large image files. I get the following error in the middle of my script: source(3dLME.R) Read 1 record Read 1 record Read 1 record Read 1 record Read 1 record Error: cannot allocate vector of size 3.1 Gb R(2081,0xa000d000) malloc: *** vm_allocate(size=3321675776) failed (error code=3) R(2081,0xa000d000) malloc: *** error: can't allocate region R(2081,0xa000d000) malloc: *** set a breakpoint in szone_error to debug R(2081,0xa000d000) malloc: *** vm_allocate(size=3321675776) failed (error code=3) R(2081,0xa000d000) malloc: *** error: can't allocate region R(2081,0xa000d000) malloc: *** set a breakpoint in szone_error to debug My Mac is 64-bit, however, I'm wondering if R is compiled as a 32-bit app? Many thanks, Robert Terwilliger __ R-help@r-project.org 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.
