Which variables are you working with?

The object cdc is a data matrix, with each row representing a case, and each column representing a variable. R calls this data format a data frame, which is a term that will be used throughout the labs.

To see what kind of data your data frame contains, you can use the names() function in R. This function returns a vector of variable names in which each name corresponds to a question that was asked in the survey. For example, for genhlth, respondents were asked to evaluate their general health from excellent down to poor. The exerany variable indicates whether the respondent exercised in the past month (1) or did not (0). Likewise, hlthplan indicates whether the respondent had some form of health coverage. The smoke100 variable indicates whether the respondent had smoked at least 100 cigarettes in his lifetime. More information about the survey here.

Use the names(your_data_frame) function to view the variables of the data frame.

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Exercise

Which variables are you working with?

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