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gets the percentiles for visual field index
vfiperc( vals, percentiles = c( 0.5, 1, 2, 5, 95 ), type = c( "quantile", "(i-1)/(n-1)", "i/(n+1)", "i/n" ) )
vf-object with vfi values
vf
percentiles at which to calculate cutoff values
see wtd.quantile for a list of different options
wtd.quantile
percentiles for visual field index
[1] B. Bengtsson and A. Heijl. A visual field index for calculation of glaucoma rate of progression. American Journal of Ophthalmology, 145, 2008
vfindex, vfstats, gloperc, locperc
vfindex
vfstats
gloperc
locperc