Bias (sampling issues)/Motivation (who contributes) are critical.
Taken together, studies reporting sex differences in declarative knowledge fail to acknowledge item sampling issues.
Sampling issues stem from the fact that the subset of users that leaves a review is not randomly sampled from those who have purchased the product.
This chapter explores the sampling issues affecting the precision and accuracy of composition estimates for stock mixtures.
Methodological challenges are discussed in regard to sampling issues, the management of data, data analysis and validity checks.
He added: "All of the other measures of house prices have been significantly stronger over the last six months than Nationwide's index, which is based on its mortgage offers and so may suffer from sampling issues.
Cardon, L. R., Idury, R. M., Harris, T. J., Witte, J. S. & Elston, R. C. Testing drug response in the presence of genetic information: sampling issues for clinical trials.
Recent criticisms regarding the design of monitoring programs have highlighted a failure to clearly state objectives and to address detectability and spatial sampling issues.
One specific transformation is As biotic volatilization which is coupled with As biomethylation and has been scarcely studied due to inherent sampling issues.
Novel rendering algorithms are added that specifically aim at solving the rendering artifacts, and sampling issues encountered in wide baseline extensions and arbitrary camera movements.
Factors such as the subject areas of the studies reviewed, research methodologies, sampling issues, responses rates and ethical considerations were the focus of the critical appraisal.
