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 0.99875-1 Index]