Compute item information for 1PL model

Compute item information for 1PL model

Usage

compute_info_1pl(b, theta)

Arguments

b

numeric difficulty parameter

theta

numeric theta

Examples

compute_info_1pl(b=1,theta=-3)
#> [1] 0.01766271
compute_info_1pl(b=1,theta=-2)
#> [1] 0.04517666
compute_info_1pl(b=1,theta=-1)
#> [1] 0.1049936
compute_info_1pl(b=1,theta=0)
#> [1] 0.1966119
compute_info_1pl(b=1,theta=1)
#> [1] 0.25
compute_info_1pl(b=1,theta=2)
#> [1] 0.1966119
compute_info_1pl(b=1,theta=3)
#> [1] 0.1049936
ti<-compute_info_1pl(b=1,theta=seq(-6,6,by=.01)) # test information
plot(ti,x=seq(-6,6,by=.01))