selectVariables: Variable selection dialog box.
In jbryer/naep: National Assessment of Educational Progress (NAEP)

This function provides a dialog box for selecting variables to read from the NAEP database. Returns a vector of variable names.

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  selectVariables(year = NULL, grade = NULL,
    subject = NULL, directory = getBaseDirectory(),
    sample = c("AT", "PM"), type = c("Student", "School"))

`year`	the year of the NAEP data.
`grade`	the grade to read.
`subject`	the subject to read (e.g. Math, Read)
`directory`	the root directory of the NAEP data disc.
`sample`	either AT or PM.
`type`	the type of data to read (i.e. Student or School)