有没有办法改变mmps的x和y轴？
require(car)
c1 <- lm(infant.mortality ~ gdp, UN)
mmps(c1, xlab="?", ylab="????????????????")
Error in mmp.lm(model, horiz, xlab = lab, groups = groups, key = key, :
formal argument "xlab" matched by multiple actual arguments
mmps(c1)