or missing variable bias), an important and intractable problem in many disciplines. The test is simple: one selects a …

produce substantial reduction in estimation bias and often renders useful estimates of the missing vector. Limited simulations …Bias in regression estimates resulting from the omission of a correlated relevant variable is a well known phenomenon …, demonstrate that significant bias in regression estimates can be substantially corrected with relatively high confidence in …

regressors. This paper shows that this often does not occur if the regression suffers from simultaneity or omitted variable bias … test for the presence of simultaneity or omitted variable bias, important and intractable problems in many disciplines. The …. Simultaneity or omitted variable bias is indicated if t-ratios and coefficients undergo these trends with more collinearity. The …