First, we avoid selection bias by randomizing whether and to whom influence-mediating messages are sent.
The versions of the advertisement differed in the extent that they implicitly warning about selection bias.
FORBES: How Selective Advertising by Mutual Funds Misleads Investors
They treat horrifying statistical conditions such as unobserved heterogeneity, selection bias, heteroscedasticity, and autocorrelation.
FORBES: Publication Bias (or, Why You Can't Trust Any of the Research You Read)
After controlling for self-selection bias, the impact of PBC on reliability shifted from negative to strongly positive.
The obvious selection bias is so problematic here that it is shocking the study was even attempted.
But both the selection bias and regular-phone-use definition might be expected to mask any adverse effect of phones.
Gynecologists raised questions about selection bias in a two-year study released last year by Mayo Clinic gynecologist Elizabeth Stewart.
"Alfred Butts had a selection bias in favour of printed newspaper English which many people have suggested ought to be rectified, " says Chew.
But these schools benefit hugely from non-public funding and selection bias.
This randomization feature allowed researchers to compare the newly-enrolled group with an equivalent group not selected knowing that there was no selection bias that might produce a spurious result.
FORBES: States Face a "Sophie's Choice" on Medicaid Expansion
Obviously, we can all point at exceptions (selection bias), but when I think of all the examples of someone telling me in advance they were doing a blog, they failed.
But like many market experiments, these suffer from a selection bias problem: Many of the people who want to buy or use these devices are already more environmentally conscious than average.
These findings show that investors will give little weight to advertised high returns if they receive even an implicit warning of selection bias, such as a reminder that the company operates many funds.
FORBES: How Selective Advertising by Mutual Funds Misleads Investors
This type of selection bias can mislead investors.
FORBES: How Selective Advertising by Mutual Funds Misleads Investors
Second, by including the entire eligible Danish population, which is covered by a national tumor registry, the study avoids the problem of selection bias (that is, people who do not make it into your study for various reasons, including refusal).
FORBES: Do Cell Phones Cause Brain Cancer? The Diehards Cling Desperately To Opinion
She argues that courts should screen for weight bias during juror selection and should address weight bias in judicial instruction, which already covers race, gender and ethnicity biases.
Can you objectively tell us if you have any contractual obligations that create bias in vendor selection with any service providers you are recommending?
FORBES: Putting An End To The Conflict Of Interest Among Some Sourcing Advisors
应用推荐