Nothing
IsRegular = function(t){
# Check the data type in terms of dense-sparse. Classification is dense (2), or data with missing values (1) or sparse (0) data
# t : n-by-1 list of vectors
tt = unlist(t);
f = length(tt)/length(unique(tt))/length(t);
if (f == 1){
if(length(unique(tt))<8){ #In case of low number of observations per subject
return('Sparse');
}
else{
return('Dense'); # for either regular and irregular data
}
} else if(f > 0.80){
return('DenseWithMV');
} else {
return('Sparse');
}
}
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