NAEPirtparams (version 1.0.0)

parameters: 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  ...  

# }