search for: ayyappa

...population PK analysis. My patient IDs are 10 digit long and NONMEM is losing precison and rouding the last couple of digits. I need to generate unique Patient IDs fromt he current 10-digit IDs. Ihave total 250 subjects so I appreciate if anybody can suggest me a way to code this in R. Regards, Ayyappa [[alternative HTML version deleted]]

...create a dosing sceinario in a second dataframe. I want to merge them both so that every individiual's PK parameters are combined with the dosing scenario into one. I do not have a common variable to merge and cbind is giving error that lengths are different. I appreciate your help. Regards Ayyappa [[alternative HTML version deleted]]

...wtdt wt lastpk 64050256 2010-09-18 275 2010-09-16 64050256 2010-09-19 277 2010-09-18 I am using !(duplicated(data$id)) to select the first row but now I want to select the first row of the unique lastpk in each unique id. I appreciate your help on this. Regards, Ayyappa [[alternative HTML version deleted]]

...giving me an error: missing data are removed missing data are removed Error in if (opt$nbins > 0) { : missing value where TRUE/FALSE needed In addition: Warning message: In cbind(X, group) : number of rows of result is not a multiple of vector length (arg 2) I appreciate your help. Regards, Ayyappa [[alternative HTML version deleted]]

...$TIME[cfn$ID==i],cfn$DV[cfn$ID==i],pch=16)} I could access only the last plot of the series and cannot go back to see all the plots. I appreciate your help in resolving this issue and also please suggest how I can export the plots as a pdf or other format files for publication purposes. Regards, Ayyappa [[alternative HTML version deleted]]

...functions. I am not able to do that with TIME column. I appreciate your help in solving this issue. Currently the TIME column is in character mode. DATE TIME DATETIME 14/07/2010 20:21 *Want:* 14/07/2010 20:11 Thanks in advance for your help. Regards, Ayyappa [[alternative HTML version deleted]]

...nd add as a column "Percentile". I got some help from R-tutorial on percentile but I am not able loop the function to calculate percentile/individual. So, I want the calculation to include only the ID=1 DVs to calculate the pecentile of conc=116. I truly appreciate your help. Regards, Ayyappa [[alternative HTML version deleted]]