This confounding factor is problematic, as it is difficult to distinguish the cause and effect.
They omit social conditioning as a factor, which is problematic to say the least and in this case they're explained by me, which is even more problematic because I don't understand science that well.
It is disputable from which factor onwards collinearity is problematic, but usually only VIF higher than 10 are considered critical [ 115].
The different operationalization of the associated factors is especially problematic.
This is problematic because factors associated with vaccination intention and actual vaccination receipt probably differ.
Adherence to long-term drug regimens is problematic, and multiple factors influence adherence status, such as regimen factors (e.g., number of pills needed daily), structural factors (e.g., ability to access drugs), individual factors (e.g., cognitive limitations, depression), and health-care provider factors (e.g., ability to listen to and communicate effectively with patients) (5– 10).
According to the 'San Francisco Declaration on Research Assessment' (http://www.ascb.org/dora/), solely depending on the journal impact factor to evaluate research quality is problematic.
CML is problematic, because its factor for NO is strongly negative (−42.7) and its factor for NO2 is weakly positive (2.8).
If we utilize the example of the effect of schooling on subsequent earnings, the estimate of causal effects is problematic because other factors might affect (or at least are correlated with) both schooling (X) and earnings (Y), which makes an unbiased estimate of the relationship between X and Y impossible (Fig. 1a).
Although the results appear divergent, the studies differ in the specific type(s) of adverse reactions being studied, the length of follow-up for side effects, and adjustment for patient-related factors; therefore, comparison of the findings is problematic.
