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Thank you, Sarah. This works just fine. So simple. I didn't know I had to change the factor to character before making the comparison. Regards, Mart?n [[alternative HTML version deleted]]

Hi to all useRs on the list. I want to know if there is a function in R which evaluates if observations of two factors (similar but with unequal levels) in a data frame are equal at row level. Example...

Hi to all. I want to create a model matrix with variables that have missing values. Recently I learned that na.pass/na.exclude and naresid are of great help in these type of cases (thanks, W. Dunlap). Here's...

Hi to all. I've been trying to calculate weight-for-age z-scores with the y2z command (AGD package). However, I keep getting strange results. My hypothesis is that missings are the problem. My dataframe looks like this: data...

Anthony, thanks for your reply. Resetting the levels didn't work. These are the first 25 rows of the dataset: structure(list(id = c(51L, 52L, 53L, 54L, 55L, 56L, 57L, 58L, 59L, 60L, 61L, 62L, 63L, 64L, 65L, 66L...

Hi. I'm trying to calculate the weighted mean score of a quality of life measure (ovt) in patients with irritable bowel syndrome by their marital status (d7). This is a summary of the structure of the dataset: > str(sii...

Thank you, David. This solves the problem. Regards, Martin On Sun, Oct 25, 2015 at 12:53 PM, David L Carlson <dcarlson at tamu.edu> wrote: > It looks like the y2z() function strips NA's so that the vector lengths...