Student Teacher Achievement 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.

References

Word, E., Johnston, J., Bain, H.P., et al. (1994). The State of Tennessee's Student/Teacher Achievement Ratio (STAR) Project: Technical Report 1985–1990. Nashville: Tennessee State Department of Education.

Examples

str(star)