Introduction

Learn about different levels of measurement and how information is arranged in data types in R.

At the end of this unit, you should be able to

• distinguish qualitative from quantitative data and discrete from continuous quantitative variables,
• identify nominal, ordinal, interval and ratio measurement levels,
• distinguish a variable’s meaning from its storage type in R,
• inspect and convert integer, double, character and logical values, and
• recognize missing and special values and check the result of a conversion.

Let’s start…

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