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The test shows also that child's ability is not endogenous.
This suggests that in general, the treatment of attending college is not endogenous, even when the returns are heterogeneous across ethnic groups in China.
We can observe from the model that although we have a selection issue, prenatal care is not endogenous and our models do not suffer from unobserved heterogeneity.
By looking at the endogeneity test based on Baum et al. (2007), we can actually see that the variable is not endogenous and, therefore, instrumenting it is not required.
The Wald test (p = 0.397) result suggests that HF staff and equipment is not endogenous in the first place and the probit estimates are more efficient and should be preferred to the IV estimates [42].
As the results do show that the returns are conditioned on minority status, one implication is that even if attending college is not endogenous, and correlated with individual unobservables, failure to control for heterogeneity due to minority group status could lead to biased estimates of the return to college in China as the OLS results in column 1 suggest.
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A search of the human genome confirmed that HMLVs are not endogenous.
They were not endogenous.
However, upon further investigation, we noted that a large proportion of significant features were not endogenous metabolites, but rather salt clusters composed of different combinations of potassium and/or sodium, with chloride and/or formate anions.
This suggests that these bands are not endogenous untagged protein.
Each step of the untargeted metabolomic workflow can introduce artifactual signals that are not endogenous to the biological sample being analyzed.
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CEO of Professional Science Editing for Scientists @ prosciediting.com