dist_f: Plot F distributions In sjPlot: Data Visualization for Statistics in Social Science

Description

This function plots a simple F distribution or an F distribution with shaded areas that indicate at which F value a significant p-level is reached.

Usage

 1 2 dist_f(f = NULL, deg.f1 = NULL, deg.f2 = NULL, p = NULL, xmax = NULL, geom.colors = NULL, geom.alpha = 0.7)

Arguments

 f Numeric, optional. If specified, an F distribution with deg.f1 and deg.f2 degrees of freedom is plotted and a shaded area at f value position is plotted that indicates whether or not the specified value is significant or not. If both f and p are not specified, a distribution without shaded area is plotted. deg.f1 Numeric. The first degrees of freedom for the F distribution. Needs to be specified. deg.f2 Numeric. The second degrees of freedom for the F distribution. Needs to be specified. p Numeric, optional. If specified, a F distribution with deg.f1 and deg.f2 degrees of freedom is plotted and a shaded area at the position where the specified p-level starts is plotted. If both f and p are not specified, a distribution without shaded area is plotted. xmax Numeric, optional. Specifies the maximum x-axis-value. If not specified, the x-axis ranges to a value where a p-level of 0.00001 is reached. geom.colors user defined color for geoms. See 'Details' in sjp.grpfrq. geom.alpha Specifies the alpha-level of the shaded area. Default is 0.7, range between 0 to 1.

Examples

 1 2 3 4 5 6 7 8 9 10 11 12 # a simple F distribution for 6 and 45 degrees of freedom dist_f(deg.f1 = 6, deg.f2 = 45) # F distribution for 6 and 45 degrees of freedom, # and a shaded area starting at F value of two. # F-values equal or greater than 2.31 are "significant" dist_f(f = 2, deg.f1 = 6, deg.f2 = 45) # F distribution for 6 and 45 degrees of freedom, # and a shaded area starting at a p-level of 0.2 # (F-Value about 1.5). dist_f(p = 0.2, deg.f1 = 6, deg.f2 = 45)

sjPlot documentation built on Oct. 15, 2018, 1:03 a.m.