Last spring, a team of cardiologists at the University of California, San Francisco, said Taser-related safety research may be biased because of ties with the company, something Taser denies.
The predicted values of the responses can be biased because of the intrinsic nonlinearity of the model.
A selection of patients for a controlled clinical trial may be biased because of prior knowledge of the treatment.
If this strategy is not employed, the estimators may be biased because of the omitted variable bias.
It is likely the impact of remittances may be biased because of endogeneity and the direction of this bias is uncertain.
The convenient approach in this study can partially capture those effects, and there is a possibility that the estimators may be biased because of the omitted variable bias.
The survey that was conducted in several hospitals may be biased because of the lack of intra-institutional consensus within respondents' institutions in filling-in the questionnaire.
Both of these lowest groups may be biased because of inadequate analysis of very small plates from many other plate boundaries.
However, if the assignment of households to the treatment and control groups is not random, then the estimation of the average treatment effect may be biased because of confounding factors.
Since human subjects often volunteer for experiments or are allowed to drop out of the experiment at any time if they want to, it is possible that the sample observed in an experiment might be biased because of the risk of randomization.
The estimation of the perceived match between one's education and one's job and hence the division into narrow and broad education programmes thus derived may be biased because of non-observed characteristics and expectations among graduates, such as the ability of graduates and their motivation in the education programme.
