star {mlmRev} | R Documentation

## Student Teacher Achievment Ratio (STAR) project data

### Description

Data from Tennessee's Student Teacher Achievement Ratio (STAR) project which was a large-scale, four-year study of the effect of reduced class size.

### Usage

    data(star)

### Format

A data frame with 26796 observations on the following 18 variables.

`id`
  a factor - student id number
`sch`
  a factor - school id number
`gr`
  grade - an ordered factor with levels `K` < `1` < `2` < `3`
`cltype`
  class type - a factor with levels `small`, `reg` and `reg+A`. The last level indicates a regular class size with a teachers aide.
`hdeg`
  highest degree obtained by the teacher - an ordered factor with levels `ASSOC` < `BS/BA` < `MS/MA/MEd` < `MA+` < `Ed.S` < `Ed.D/Ph.D`
`clad`
  career ladder position of the teacher - a factor with levels `NOT` `APPR` `PROB` `PEND` `1` `2` `3`
`exp`
  a numeric vector - the total number of years of experience of the teacher
`trace`
  teacher's race - a factor with levels `W`, `B`, `A`, `H`, `I` and `O` representing white, black, Asian, Hispanic, Indian (Native American) and other
`read`
  the student's total reading scaled score
`math`
  the student's total math scaled score
`ses`
  socioeconomic status - a factor with levels `F` and `N` representing eligible for free lunches or not eligible
`schtype`
  school type - a factor with levels `inner`, `suburb`, `rural` and `urban`
`sx`
  student's sex - a factor with levels `M` `F`
`eth`
  student's ethnicity - a factor with the same levels as `trace`
`birthq`
  student's birth quarter - an ordered factor with levels `1977:1` < ... < `1982:2`
`birthy`
  student's birth year - an ordered factor with levels `1977:1982`
`yrs`
  number of years of schooling for the student - a numeric version of the grade `gr` with Kindergarten represented as 0. This variable was generated from `gr` and does not allow for a student being retained.
`tch`
  a factor - teacher id number

### Details

Details of the original data source and the process of conversion to this representation are given in the vignette.

### Source

http://www.heros-inc.org/data.htm

### Examples

    str(star)

[Package mlmRev version 0.995-1 Index]