A nonparametric modification is proposed for Cox's proportional hazards model (Cox, 1972, Journal of the Royal Statistical Society, Series B 34, 187-220), where the covariates are fixed, but their ...

The regression models were specified for hospital-level fixed effects and clustering by HRR to take into account the correlation of the HRR-level independent variables.

Methods This study combines two quasi-experimental approaches to improve causal inference by better accounting for these biases: (i) linear fixed effects regression analysis and (ii) linear ...

In the first analysis we assessed how the number of lower-acuity ED visits changed when an urgent care center visit occurred within each ZIP code, using a fixed-effects panel regression.

To assess the effects of changes in female political representation on under-five mortality and social protection programs in each municipality, we used linear fixed-effect regression models for ...

Secondary data from the Medicare Cost Report (MCR), the Agency for Healthcare Research and Quality (AHRQ), and American Hospital Association Annual Survey (AHA) was used to test hypothesized ...