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...mns of matrix X, Z1 to Z5 are columns of matrix Z, data.fr = data.frame(y,X,Z). I got the error message: Error in getGroups.data.frame(dataMix, groups) : Invalid formula for groups Could you please suggest me know to solve this problem? Do I use incorrect arguments? Thank you very much. Nantachai

...= 1,.., ni) or it can be just one observation per subject (i.e. Yi, i = 1,...,M). Since we have to specify the groups for random effect components, if we have only one observation per subject, then each group will have only one observation. Thank you vert much for your help. Sincerely yours, Nantachai

Hi, I am interested in using functional principal component analysis (Functional PCA). However, in the help of fda package, it does not have an example of pca.fd function. Does anyone have the example of pca.fd function? Thank you very much. Sincerely yours, Nantachai