| parameters {NAEPirtparams} | R Documentation |
NAEP IRT parameters.
Description
This data table contains NCES NAEP Assessment IRT parameters from 1990 to 2015. To find all item parameters for an assessment, filter the data table by level, subject, and year. Assessments from 1990 to 2000 also require filtering by assessmentCode and accommodations.
Usage
parameters
Format
A data frame with columns
- source
source of data, character
- level
grade or age level of test, integer
- levelType
"grade" or "age", character
- NAEPid
test item ID, character
- 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
- a
slope or a parameter, numeric
- b
difficulty or d parameter, numeric
- c
guessing or g parameter, numeric
- d1
location of cut point 1 for polytomous item, numeric
- d2
location of cut point 2 for polytomous item, numeric
- d3
location of cut point 3 for polytomous item, numeric
- d4
location of cut point 4 for polytomous item, numeric
- d5
location of cut point 5 for polytomous item, numeric
References
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/scaling_irt.aspx
Examples
## Not run:
param <- NAEPirtparams::parameters
param8M2005 <- param[param$level == 8 & param$subject == 'Mathematics' & param$year == 2005, ]
head(param8M2005)
source level levelType NAEPid ... subtest subject year a b c ...
7657 website 8 grade M066201 ... algebra Mathematics 2005 0.77 -1.75 0.07 ...
7658 website 8 grade M067401 ... algebra Mathematics 2005 0.92 1.28 0.18 ...
7659 website 8 grade M086101 ... algebra Mathematics 2005 0.63 0.32 0.11 ...
7660 website 8 grade M047701 ... algebra Mathematics 2005 1.01 1.29 0.26 ...
7661 website 8 grade M067301 ... algebra Mathematics 2005 1.02 -0.03 0.16 ...
7662 website 8 grade M067701 ... algebra Mathematics 2005 0.78 -2.01 0.06 ...
## End(Not run)