In RC-IRT, the density of latent ability, g (θ), needs to be estimated simultaneously with the item parameters. The shape of the latent-ability density curve is determined by a shape parameter η, ...

Featured in: Fitting Density Curves and Creating a Two-Way Comparative Histogram HISTOGRAM < variable (s) > </ option (s) >; To do this Use this option Create output data set with information on ...

A kernel density curve may follow the shape of the distribution more closely. To construct a normal kernel density curve, one parameter is required: the bandwidth .The value of determines the degree ...

Which normal density curve best approximates the sample histogram? The answer suggested here is the normal curve that minimizes the integrated squared deviation between the histogram and the normal ...