Description Usage Format Details Source Examples

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.

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

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

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