wages1833 data frame gives the wages
of Lancashire cotton factory workers in 1833.
This data frame contains the following columns:
age in years
number of male workers
average wage of male workers
number of female workers
average wage of female workers
Boot, H.M. 1995. How Skilled Were the Lancashire Cotton Factory Workers in 1833? Economic History Review 48: 283-303.
attach(wages1833) plot(mwage~age,ylim=range(c(mwage,fwage[fwage>0]))) points(fwage[fwage>0]~age[fwage>0],pch=15,col="red") lines(lowess(age,mwage)) lines(lowess(age[fwage>0],fwage[fwage>0]),col="red")