transformations: NAEP transformation constants.
In NAEPirtparams: IRT Parameters for the National Assessment of Education Progress

Description Usage Format References Examples

This data table contains NCES NAEP Assessment transformation constants from 1990 to 2015. To find the transformation constants for an assessment, filter the data table by level, subject, and year. Some assessments also require filtering by assessmentCode and/or accommodations.

1	transformations

A data frame with columns

source: source of data, character
level: grade or age level of test, integer
assessmentCode: "State" or "National", character
accommodations: "accom" or "no-accom", character
subtest: subtest within subject, character
subject: subject of test, character
year: year of test, integer
scale: scale of subtest, numeric
location: location of subtest, numeric
subtestWeight: weight of subtest, numeric

Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 1990-2015, various subjects. Retrieved from https://nces.ed.gov/nationsreportcard/tdw/analysis/trans_constants.aspx

## Not run: 

t <- NAEPirtparams::transformations
t8M2005 <- t[t$level == 8 & t$subject == 'Mathematics' & t$year == 2005 & is.na(t$assessmentCode), ]
head(t8M2005)
     source level   ...       subtest     subject year scale location subtestWeight
229 website     8   ...       algebra Mathematics 2005 35.64   281.79          0.30
228 website     8   ...          data Mathematics 2005 40.37   281.91          0.15
227 website     8   ...      geometry Mathematics 2005 33.22   275.64          0.20
226 website     8   ...   measurement Mathematics 2005 46.57   275.86          0.15
225 website     8   ...        number Mathematics 2005 37.78   277.11          0.20


## End(Not run)