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...files(myloc,"*.zip",full=T) Error in list.files(path, pattern, all.files, full.names, recursive) : invalid 'pattern' regular expression Bug? or have I missed something Steve. Dr Steve Roberts steve.roberts at manchester.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192/5764 / 0161 276 5785

...ession. I suspect I don't understand expressions properly. For the real problem I do need to have my expression string in a variable as it is data-dependent. Can someone tell me the magic words? Steve Dr Steve Roberts steve.roberts at man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

...;s value I get the value of the two-part name. Ie set fred$x.pair and print the value of fred$x it gives me the value I set to fred$x.pair. Weird and somewhat disturbing! Maybe an example makes it clearer: Dr Steve Roberts steve.roberts at man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

...times in pure R code. R1.7.1 and 1.8.1 seem to behave identically. Windows 2000 Pro. I do get the dyn.load warning about the DLL changing the FPU control word. Does this ring any bells with anyone? Steve. Dr Steve Roberts steve.roberts at man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

...to think a bit deeper about it - I still haven't got my head around what a negative variance could mean - does anyone know a way to take away the contraint and allowing zero or negative variances? Steve. Dr Steve Roberts steve.roberts at man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

...detailed lines x<-seq(0,10,by=.01) y<-x^2 for (delta in 1:4) lines(x+8+delta,y,lwd=delta,type="l") -------------------------------------------------------------------------------------------- Dr Steve Roberts steve.roberts@man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

...each fortran routine is inelegant. It probably isn't as easy as it sounds - I guess there are multi-platform issues? Is this a sensible suggestion to add to the wish list? Keep up the good work Steve. Dr Steve Roberts steve.roberts at man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

...y,m="k") Kendall's rank correlation tau data: x and y z = 0.5132, p-value = 0.6078 alternative hypothesis: true tau is not equal to 0 sample estimates: tau 0.03481553 > Dr Steve Roberts steve.roberts at man.ac.uk Senior Lecturer in Medical Statistics, CMMCH NHS Trust and University of Manchester Biostatistics Group, 0161 275 5192 / 0161 276 5785

Let me modify my question about user-defined covariance structures for LME models: Can somebody tell me how I can see the code for the definition of the correlation structures that come with the NLME package. Specifically I like to see the code for the functions coef, corMatrix, and intialize for any of the pre-defined correlation structures, and use this as a template to define a new correlation