Extract quantities of interest from a Zelig simulation
get_qi(object, qi = "ev", xvalue = "x", subset = NULL)an object of class Zelig
character string with the name of quantity of interest desired:
"ev" for expected values, "pv" for predicted values or
"fd" for first differences.
chracter string stating which of the set of values of x
should be used for getting the quantity of interest.
subset for multiply imputed data (only relevant if multiply imputed data is supplied in the original call.)