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Suppose I have a vector ["A_cont_1", "A_cont_12", "B_treat_8", "AB_cont_22", "cont_21_Aa"], I hope I can extract the strings which include 3 short strings, say "A", "cont" and "2", that is to say, "A_cont_12", "AB_cont_22" and "cont_21_Aa" will be extract, using a relatively short code

Dear all, I am trying to calculate sample size for a clinical research, on the basis of generalized wilcoxon test or Tarone-Ware test. It seems SAS can do this job using it "POWER" procedure, but SAS is not available to me. I would be very grateful if you could let me know if any R package or other tools which could cope with this problem. Best Regards, Wang [[alternative HTML

Dear all, I have the problem as the title shows. It is time series of measurements. I want to estimate the value at time point when we have no actual measured value (Only in the time range, not for prediction in future time). Hope you could give me some suggestion or hint. Thank you so much. Wang Zhipeng [[alternative HTML version deleted]]

Hello all, When I wanted to use package "foreach", I got the Error. That is: > library(foreach) Error in get(Info[i, 1], envir = env) : internal error -3 in R_decompress1 Error: package/namespace load failed for ‘foreach’ I am using R-2.14.2, 64 bit. Even I reinstalled R and package "foreach", the Error could not be fixed. Would you please to give me some advice? Thanks