Pareto Plot of Coefficients or t Values

DESCRIPTION:

Creates a Pareto plot (vertical bar plot) of coefficients or t-values of linear regression model.

USAGE:

pareto(fit, type = "coefficients", sig = 0.05, xmax,  
          prt.values = T, shade = F, ...) 

REQUIRED ARGUMENTS:

fit
the output from an lm model.
type
one of either "coefficients" or "tvalues" determining whether coefficients or t-statistics are plotted.
sig
In the case of t-statistics, the significance level of the significance line that is added to the plot. It is ignored if type = "coefficients".
xmax
upper value of graphical parameter xlim.
prt.values
a logical flag for whether values are printed at end of bars.
shade
logical flag for whether will be shaded or filled with solid colors.

SIDE EFFECTS:

A Pareto plot is produced on the current graphics device.

DETAILS:

The significance lines are based on the assumption that all statistics plotted have the same standard error. Single degree of freedom t-statistics are comparable, and also coefficients from fractional factorial designs.

SEE ALSO:

, .

EXAMPLES:

devel.lm <- lm(conversion ~ f1*f2*f3*f4, devel.df) 
pareto(devel.lm)