converting data.frame into a numeric ( integer) form
On 17.04.2011 19:29, Haillie wrote:
Hi Everyone, I am relatively new to R and would appreciate your help on this problem that I encontered this morning. When running an ordinal IRT model using Ratings package on R, I keep getting this error message. ord.out<-ordrating(UNORD, burnin = 1000, mcmc = 40,000, thin = 400, tune = 1, verbose = 1000, seed = NA) Error in as.vector(as.integer(Y)) : (list) object cannot be coerced to type 'integer' UNORD is my data.frame
... but ?ordrating tells you it must be a matrix rather than a data.frame. Uwe Ligges
and it is in the form of delimited CSV file without either row or column name. According to the help page on Ordinal ratings, Y should be "a Matrix of data to be analyzed. Entries must be integers from 1; : : : ;C or NA where C is the number of ordinal categories. Items are on the rows and subjects are on the columns." I am confused because my data.frame only contains numerica values of 1,2,3, and NA. I checked and my NAs were all numeric. Any help or advice you could provide on this issue would be greatly appreciated. Thank you very much. I would like to thank all the R experts navigating this forum in advance. Sincerely, Haillie -- View this message in context: http://r.789695.n4.nabble.com/converting-data-frame-into-a-numeric-integer-form-tp3455811p3455811.html Sent from the R help mailing list archive at Nabble.com.
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