marital status and computer usage on wages. Within-twin estimates indicate that, unlike education, job tenure and union status …, neither marital status nor computer usage have a large or significant effect on wages …Both marital status and computer usage on the job have been found to increase earnings by as much as two additional …

example, two recent relatively prominent papers have attempted to estimate the respective direct effects of marriage and gang … choosing the treatment (e.g. marriage or gang membership) may have differed in their criminality from those who did not even in … taken when it comes to interpreting the results arising from fixed-effects methods. -- Fixed-effects ; crime ; marriage …