This method includes all available information, but is limited by multiple selection biases (selection of more severe autopsied or operated cases).
The differences in mortality between inborn and outborn babies who were admitted to the NICU may in part be attributable to multiple selection biases.
Although the study is strengthened by inclusion of multiple sites, selection bias cannot be ruled out, and generalization of the findings to other hospitals and health settings should be performed with caution.
From their perspective, I imagine that complaints about multiple comparisons and selection bias would fall into the category of "technicalities". But, y'know, if you want to play the game you gotta follow the rules.
Sampling introduces multiple opportunities for selection bias, which should be recognized and controlled.
Incomplete access to all identified members of the sample introduces multiple opportunities for selection bias, which should be recognized and controlled.
In addition, the diversity of the participants coming from multiple universities reduced selection bias.
The identification of cases from population-based registers which ascertain cases from multiple sources mitigates against selection bias but cannot reduce non-response bias.
However, the representativeness of the studied tumor materials may be questioned because the tumors were from multiple sources and, hence, selection bias may have occurred.
OS is affected by multiple factors, and favorable selection bias likely applies more to the groups that received ipilimumab after RT, as some of the patients received RT in 2009 2010 and they lived long enough to reach the FDA approval of ipilimumab in 2011.
We used multiple imputation techniques to assess selection bias due to missing data.
