This paper uses the concept of the triad census first introduced by Holland and Leinhardt, and describes several distributions on directed graphs. Methods are presented for calculating the mean and the covariance matrix of the triad census for the uniform distribution that conditions on the...

This paper examines the econometric causal model for policy analysis developed by the seminal ideas of Ragnar Frisch and Trygve Haavelmo. We compare the econometric causal model with two popular causal frameworks: Neyman-Holland causal model and the do-calculus. The Neyman-Holland causal model...

We define a general class of network formation models, Statistical Exponential Random Graph Models (SERGMs), that nest standard exponential random graph models (ERGMs) as a special case. We provide the first general results on when these models' (including ERGMs) parameters estimated from the...

Haavelmo's seminal 1943 paper is the first rigorous treatment of causality. In it, he distinguished the definition of causal parameters from their identification. He showed that causal parameters are defined using hypothetical models that assign variation to some of the inputs determining...

Although the not-for-profit sector contributes greatly to aggregate output in many industries, there is little explicit analysis of the consequences of applying antitrust policy in this sector. This paper argues that the same incentives to collude exist in the non-profit sector as in the...

American nonprofit organizations are generally exempt from federal income tax, with the exception that profits earned from activities that are subject to the Unrelated Business Income Tax (UBIT). The UBIT is intended to prevent nonprofits and taxable for-profit firms, and also to prevent erosion...

This paper uses a rich employer-employee matched data set to investigate the existence and the extent of nonprofit and part-time wage and compensation differentials in child care. The empirical strategy adjusts for workers' self-selection into the for-profit or nonprofit sectors, into full-time...

I exploit a plausibly exogenous change in hospital financial incentives to examine whether the behavior of private not-for-profit hospitals varies with the share of nearby hospitals organized as for-profit firms. My results show that not-for-profit hospitals in for-profit intensive areas are...

This paper examines how the managerial labor market in nonprofit hospitals has adjusted to the negative income pressures created by HMO penetration. Using a panel of about 1500 nonprofit hospitals over the period 1992 to 1996, we find that top executive turnover increases following an increase...

This analysis provides an in-depth investigation of the determinants of pay in the nonprofit sector. The main findings are as follows. First, holding constant individual characteristics, average weekly wages are 11 percent lower in nonprofit than for-profit jobs. However, this difference is...