progression.cigts {vfprogression}

CIGTS VF progression

Description

progression.cigts returns the progression of visual field test based on 52 or 54 total deviation probabilities (tdp). CIGTS VF progression (Musch et al., 1999).

Usage

progression.cigts(measmatrix)

Arguments

measmatrix

is a data frame. MUST contain the following columns: 52/54 TD probs (column names MUST be 'tdp1' ~ 'tdp52' or 'tdp1' ~ 'tdp54'), 'yearsfollowed', and 'eyeid'. Rows represent the single measurements. The minimum measurements (rows) is 5.

Value

"stable", "worsening", or "improving" of measurements in measmatrix. Note: If a VF series is temporarily improving and temporarily worsening, it is assumed to be "stable" overall

References

http://www.aaojournal.org/article/S0161-6420(99)90147-1/abstract

Examples

data(vf.cigts)
colnames(vf.cigts)
progression.cigts(vf.cigts)
progression.cigts(vf.cigts[vf.cigts$eyeid == 1,])
progression.cigts(vf.cigts[vf.cigts$eyeid == 2,])