Estimate the Point of Subjective Equivalence (PSE), the Just Noticeable Difference (JND) and the related Standard Errors by means of Delta Method. The method only applies to univariable GLMs (psychometric functions) having a probit link function.
PsychDelta(model, alpha = 0.05)
the fitted psychometric function. An object of class
significance level of the confidence interval.
PsychDelta estimates PSE and JND of a univariable psychometric
function (object of class
PsychDelta returns a matrix including Estimate, Standard Error,
Inferior and Superior Confidence Interval of PSE and JND. Confidence Intervals
are computed as: Estimate +/- z(1-(α/2)) * Std.Error.
The function assumes that the first model coefficient is the intercept and the second is the slope. The estimate of the JND assumes a probit link function.
Faraggi, D., Izikson, P., & Reiser, B. (2003). Confidence intervals for the 50 per cent response dose. Statistics in medicine, 22(12), 1977-1988. https://doi.org/10.1002/sim.1368
Moscatelli, A., Mezzetti, M., & Lacquaniti, F. (2012). Modeling psychophysical data at the population-level: The generalized linear mixed model. Journal of Vision, 12(11):26, 1-17. https://doi.org/10.1167/12.11.26
glm for for Generalized Linear Models (without
random effects) and
glmer for Generalized Linear Mixed
Models (including random effects).
for univarible and multivariable GLMM, respectively (object of class
pseMer for bootstrap-based
1 2 3 4 5 6
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.