visualFields (version 0.6.2)

retestconddist: Conditional retest distribution

Description

Computes the conditional retest distribution and the ( 1 - alpha / 2 ) conditional retest intervals

Usage

retestconddist( vf, nbase = 1, nfollow = 1, alpha = 0.1, typequantile = 7 )

Arguments

vf

Visual field data. It has to have as many visual fields as nbase + nfollow

nbase

Number of visual fields to be used as baseline

nfollow

Number of visual fields to be used as follow up.

alpha

Significance to derive the ( 1 - alpha / 2 ) conditional retest intervals. Default value is 0.1

typequantile

An integer between 1 and 9 selecting one of the nine quantile algorithms detailed below to be used. Default value is 7

Value

conditional retest distribution and the ( 1 - alpha / 2 ) conditional retest intervals

References

[1] A. Heijl, A. Lindgren, and G. Lindgren. Test-retest variability in glaucomatous visual fields. American Academy of Ophthalmology, 180, 1989.

Examples

# NOT RUN {
  vfcondretest <- retestconddist( vf91016left[c(1:4),], nbase = 2, nfollow = 2 )
# }