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To select certain variables (for example. AGEGRP, TOTINC & WEIGHT). We create a new vector called myvars and then assign a subset data frame using myvars.

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myvars <- c(“AGEGRP”, “TOTINC”, “WEIGHT”)

new_data_frame <- df[myvars]

There is another method to subset variables based on index. Suppose we wish to select 1st and 5th thru 10th variables.

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Selecting the first 5 observations.

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Selecting first 5 observations and first 3 variables.

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Finally, let’s try creating a new data frame with FEMALES (SEX = 1) earning more than 35000

# sub-setting based on values of variables

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External resource for subsetting in R: http://www.statmethods.net/management/subset.html