Reutfors said this apparent protective effect was probably tied to survival bias
For example, the impact of one of the clinical factors, age, may even introduce a survival bias
on genotype frequencies that is difficult to model, and the authors' analysis does not explicitly address the possibility that the clinical characteristics alone might be more precise indicators of prescription threshold than genotype information alone.
Caplan is probably correct in noting that the Columbia University study on the effect of TC and LDL-C on mortality was subject to survival bias
, indication bias, and possibly better medical care in general for the statin users.
The literature on survival bias
for stocks is discussed in the second section.
Since student withdrawal data was omitted, the results of the study are subjected to survival bias
In the absence of commonality, a sample average can possess substantial survival bias
but can still equal the appropriate inference about an asset's expected return.
One procedure to ameliorate the impact of survival bias
without encountering the above problem is to match the sample firms with control firms on the basis of survival.
Muka said, included the possibility of survival bias
, since enrollees "may represent survivors of early menopause who did not develop [type 2 diabetes] or die prior to enrollment.
These differences over time probably are a result of survival bias
, the investigators suggested.
To evaluate the survival bias
in analyzing the relationship between the Glu298Asp mutation and progression to chronic renal failure, we divided the patients into two groups according to the duration of hemodialysis; among the diabetics, patients who had experienced >5 years of hemodialysis were placed in the long-term survival group, whereas patients with hemodialysis <5 years were placed in the short-term group.
Through simulation and analysis of emerging market histories, we show that statistics about emerging markets may be strongly biased by survival bias
and by "sorting" bias.
There was a potential survival bias
in this evaluation, Dr.