當一行可以由多個分類變量定義時,如何根據分類變量對數據框進行子集化 [英]How to subset a data frame based on categorical variables when a row can be defined by more than categorical variable
當我們同時擁有分類變量和連續變量時,可以使用相異矩陣代替數據框架嗎? [英]Can dissimilarity matrix be used instead of data frame when we have both categorical and continuous variables?