Calculate 'bias' of grid as defined by Slater (1977).

"Bias records a tendency for responses to accumulate at one end of the grading scale" (Slater, 1977, p.88).

Usage

indexBias(x, min = NULL, max = NULL, digits = 2)

x: repgrid object.
min, max: Minimum and maximum grid scale values. Nor needed if they are set for the grid.
digits: Numeric. Number of digits to round to (default is 2).

Numeric.

STATUS: Working and checked against example in Slater, 1977, p. 87.

Slater, P. (1977). The measurement of intrapersonal space by Grid technique. London: Wiley.

indexBias(boeker)
#>  max 
#> 0.22