[R] elegant way to remove cases with many different ids

Dear R-List, I have nested data with cases grouped by IDs and I want to remove all cases with specific IDs. something like df-data.frame(id=c(1,1,1,2,2,2,3,3,3,4,4,4,5,5,5),var=c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15)) subset(df,id== 1 | id == 3) Having a very large dataset with many IDs to

[R] package methods in options(defaultPackages) was not found

Dear R-List, I receive a strange error message when starting R. It says: Warning message: package methods in options(defaultPackages) was not found Error in file(filename, r) : cannot open the connection In addition: Warning message: In file(filename, r) : cannot open file

[R] results of robust regression vs. OLS regression

Dear R-List, due to outliers in my data I wanted to carry out a robust regression. According to APA standards, reporting OLS regression results should include   1. unstandardized beta coefficients 2. standardized beta coefficients 3. SE 4. t values 5. r squared 6. r squared adjusted 7. F

[R] recode categorial vars into binary data

Dear R-List, I would like to recode categorial variables into binary data, so that all values above median are coded 1 and all values below 0, separating each var into two equally large groups (e.g. good performers = 0 vs. bad performers =1). I have not succeeded so far in finding a nice

[R] recode data according to quantile breaks

Dear R-List, I would like to recode my data according to quantile breaks, i.e. all data within the range of 0%-25% should get a 1, 25%-50% a 2 etc. Is there a nice way to do this with all columns in a dataframe. e.g. df-

[R] weighing proportion of rowSums in dataframe

Dear R-List, I am sure there must be a very simple way to do this - I just do not know how... This is what I want to do: #my dataframe df-data.frame(id=c(x01,x02,x03,x04,x05,x06),a=c(1,2,NA,4,5,6),b=c(2,4,6,8,10,NA),c=c(NA,3,9,12,NA,NA),sum=c(3,9,15,24,15,6))    id    a     b c   sum 1

Re: [R] weighing pro​portion of rowSums i​n dataframe

,4,5,6),b=c(2,4,6,8,10,NA),c=c(NA,3,9,12,NA,NA)) (df$wSum-apply(sweep(df[,-1],1,rowSums(df[,-1],na.rm=T),/),1,function(x)sum(x*w,na.rm=T))) hth. Am 06.02.2013 14:17, schrieb D. Alain: Dear R-List, I am sure there must be a very simple way to do this - I just do not know how

[R] mirt vs. eRm vs. ltm vs. winsteps

Dear R-List, I tried to fit a partial credit model using the pcmdat from eRm-package comparing the results of mirt, eRm, ltm and winsteps. The results where quite different, though. I cannot figure out what went wrong and I do not know which result I can rely on. This is what I did in R

[R] many-facet rasch analysis in R

Dear R-list, is there any R-package that I can use to carry out a many-facet rasch analysis in R? Thank you. Best wishes Alain [[alternative HTML version deleted]] __ R-help@r-project.org mailing list

[R] R crash when using pan for multiple imputation

Dear R-List, I apologize for not posting a reproducible example - the reason is that I actually do not succeed in reproducing my specific problem with generated data. Let me still describe the problem: I want to impute missing data using the pan package. a) It works, when I use a fraction

[R] error in model specification for cfa with lavaan-package

Dear R-List, (I am not sure whether this list is the right place for my question...) I have a dataframe df.cfa

[R] routine for dependent correlation test with stratified random sample

Dear R-List,   I would like to have a large number of stratified random subsamples drawn from my dataframe and automatically test for correlation differences in every subsample.   Let this be my dataframe  

[R] Subset according to groups NA proportion within specific variables

3     -0.67463191   1    NA 3 -0.66410552   2 7 3     -0.02543358   1 8 Please excuse me if the problem has already been treated somewhere, but so far I was not able to find the right threat for my question in RSeek. Can anyone help? Thanks in advance! D. Alain

[R] recode according to specific sequence of characters within a string variable

Dear R-List, I have a dataframe with one column name.of.report containing character values, e.g. df$name.of.report jeff_2001_teamx teamy_jeff_2002 robert_2002_teamz mary_2002_teamz 2003_mary_teamy ... (i.e. the bit of interest is not always at same position) Now I want to recode the column

[R] Logical operator fails to recognize vector element

31 svn rev 52157 languageR version.string R version 2.11.1 (2010-05-31) Thanks D. Alain __ R-help@r-project.org mailing list https