Fixed- and random-effects models are often used to control for unmeasured personspecific effects when examining the influence of measured covariates on an outcome. To date, different estimators are used for fixed- and random-effects models, making it difficult to choose between these two...

Using a Danish data set that follows 135,000 Danish children from birth through 9th grade, we examine the effect of maternal employment during a child's first three and first 15 years on that child's grade point average in 9th grade. We address the endogeneity of employment by including a rich...