rec.mean.var {DACF} | R Documentation |
recover mean and variance of the data with ceiling/floor effects
rec.mean.var(y)
y |
a (non-empty) numeric vector of data with ceiling/floor effects |
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 |
# 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)