1.

Which is more general than a matrix, in that different columns can have different modes?(a) Data types(b) Data frames(c) Data sets(d) Databases

Answer» Correct answer is (c) Data sets

Easy explanation: A data frame is more general than a matrix, in that different columns can have different modes (numeric, character, factor, etc). This is similar to SAS and SPSS datasets. There are many ways to identify the elements of a data frame.


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