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Exercise

Interlude (2)

However, R doesn't just allow you to select on one index. You can also subset using an index range. For example, to see the weights for the first 10 respondents you can type cdc[1:10, 6]. In this expression, you have asked just for rows in the range 1 through 10.

R uses the : to create a range of values, so 1:10 expands to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. You can see this by entering 1:10 in the console.

This also allows you to do for example cdc[5:16, 1:3] to retrieve the first 3 variables for respondents 5 through 16.

Instructions

100 XP
  • Assign the variables between and including hlthplan and height for the first 8 respondents to first8.
  • Assign the variables between and including weight to gender for respondents 10 to 20 to wt_gen_10_20.