rec.mean.var: rec.mean.var

Description Usage Arguments Value Examples

View source: R/rec.mean.var.R

Description

recover mean and variance of the data with ceiling/floor effects

Usage

1

Arguments

y

a (non-empty) numeric vector of data with ceiling/floor effects

Value

ceiling.percentage

the percentage of ceiling values in the data

floor.percentage

the percentage of floor values in the data

est.mean

estimated mean of the true scores

est.var

estimated variance of the true scores

Examples

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# simulate normally distributed true scores
x=rnorm(1000,2,4)
mean(x); var(x)
# induce 20% floor effects
# and estimate the true mean variance from the floor data
x.f=induce.cfe(.2,0,x)
rec.mean.var(x.f)
# induce 20% ceiling effects
# and estimate the true mean and variance from the ceiling data
x.c=induce.cfe(0,.2,x)
rec.mean.var(x.c)
# induce 20% and 10% of floor and ceiling effects, respectively
# and estimate the true mean and variance from the data with floor and ceiling effects
x.cf=induce.cfe(.2,.1,x)
rec.mean.var(x.cf)

QMmmmLiu/DACFD documentation built on Nov. 18, 2017, 8:53 a.m.