similar to: 'trim' must be numeric of length one？

Dear R-user, Could anybody tell me of the key difference between data mining and text mining? Please make a list for packages about data/text mining. And give me an example of text mining with R (any relating materials will be highly appreciated), because a vignette written by Ingo Feinerer seems too concise for me. Thanks _____________________________________________ Dr.Ruixin ZHU Shanghai

Hi, everyone, I try to run as follows: Z>library("RODBC") Z>cnct<-odbcConnectExcel("Forbes2000.xls") Z>cnct RODB Connection 1 Details: case=nochange DBQ=C:\Program Files\R\R-2.5.0\Forbes2000.xls DefaultDir=C:\Program Files\R\R-2.5.0 Driver={Microsoft Excel Driver (*.xls)} DriverId=790 MaxBufferSize=2048 PageTimeout=5 Z>sqlQuery(cnct, "select

Dear R-users, When I installed "rattle" package with the command: install.packages("rattle", dependencies=TRUE), I got Warning message: Dependency 'Design' is not available Is this warning serious? How to avoid this warning? Thanks _____________________________________________ Dr.Ruixin ZHU Shanghai Center for Bioinformation Technology rxzhu@scbit.org

Dear R-users, It seems that install.packages( ) doesn't work to RMySQL package. Would anybody have the experience of that? Thanks _____________________________________________ Dr.Ruixin ZHU Shanghai Center for Bioinformation Technology rxzhu@scbit.org zhurx@mail.sioc.ac.cn 86-21-13040647832 [[alternative HTML version deleted]]

How can I get the log odds associated with the levels in strata() within a clogit() model? I'm running R-1.9.0 on a Linux platform. I am using clogit() to run a Rasch model in Item Response Theory in psychometrics. Symbolically, the model is: logit(p_{j,k}) = \log({\Pr(p_{j,k}) \over \Pr(1-p_{j,k})}) = \theta_j - \alpha_k, That is, the log odds of answering an test item correctly is

Dear R-users, I'm using Ubuntu dapper, which only have R of Version 2.2.1. Would anybody tell me how to install the latest version of R with Synaptic in Ubuntu dapper system. Thanks!