Model-free estimation of a psychometric function

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link = probit_link(guessing,lapsing)

Probit link in cell form for use with GLMFIT, GLMVAL and other Matlab GLM functions.

The guessing rate and lapsing rate are fixed, hence link is a function of only one variable.

Optional input:

guessing: guessing rate; default is 0

lapsing: lapsing rate; default is 0

Output:

link: probit link for use in all GLM functions; cell with 3 entries:

• probitFL: link function
• probitFD: derivative
• probitFI: inverse link

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