Post-stratification or a non-response adjustment?

Risk stratification, risk adjustment, and other risks.

“BUT our patients are sicker than yours!” is the refrain when physicians are faced with adverse comparisons of their patients’ outcomes with those of other groups, hospitals, or health systems. Meaningful and fair comparison of clinical performance requires statistical adjustment of outcomes for differences in clinical acuity of patients treated and complexity of procedures performed, among oth...

Title Sensitivity of Econometric Estimates to Item Non - response Adjustment

Non-response in establishment surveys is a very important problem that can bias results of statistical analysis. The bias can be considerable when the survey data is used to do multivariate analysis that involve several variables with different response rates, which can reduce the effective sample size considerably. Fixing the non-response, however, could potentially cause other econometric pro...

Principal stratification--a goal or a tool?

Principal stratification has recently become a popular tool to address certain causal inference questions, particularly in dealing with post-randomization factors in randomized trials. Here, we analyze the conceptual basis for this framework and invite response to clarify the value of principal stratification in estimating causal effects of interest.

Eating or Feeding Our Young: A Response to Recent Commentaries

wind shear and stratification effects on baroclinic adjustment

the baroclinic adjustment is defined as the neutralization of the mean flow by eddies. with the amplitude growth of the baroclinic waves generated by an unstable mean flow, the eddy fluxes increase and act to reduce the meridional temperature gradient or vertical wind shear of the mean flow to subcritical value. this is believed to constitute the basic mechanism of baroclinic adjustment. the co...