a data frame is limited to 1000 variables (attributes)

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Chapter 2 R basics | Introduction to Data Science - rafalab15.3 Exercises · 15.4 Central Limit Theorem in practice ... n ... For a numeric variable it prints out the five number summary and the median.model.matrix function | R Documentationdata. a data frame created with model.frame . If another sort of object, ... the default factor coding for that variable and any "contrasts" attribute set by C or ...