Below we summarize the information regarding the specification of effect estimates, air quality, populations, and baseline health data that we described above as being most helpful to risk assessors and epidemiologists conducting meta-analyses.
(2) We also explored a categorical specification of the effect of age at diagnosis comparing cases to controls.
We have also planned implementation of methods seldom (a priori hypotheses to explain possible effect modification, including specification of direction of effect) or very seldom (use of the GRADE approach to rating confidence in estimates of effect) implemented in current systematic reviews.
For this reason, we estimate the econometric model for up to 10 different specifications of the cohort effect (Tleft( y right) ) depending on the number of trend periods (one, two, or three) and the type of trend (linear, quadratic, and polynomial of 3rd and 4th degree) as shown in Table 1.
Simplified specifications of the temperature effect using linear and cold threshold models were considered within the same modelling framework.
As a result, establishing any specification of the effects of CT programs remains difficult.
Observed HR and GS values display linear trends when compared to values predicted by the top-ranking models (Fig. 2a b), indicating that specification of main effects only did not result in poor fit due to omission of any major interaction terms.
Similarly, although we model under the simplistic assumption of additive effects and no local epistasis, these assumptions could be relaxed by a more sophisticated specification of locus effects, for example, using the group LASSO [Meier et al., 2008; Yuan and Lin, 2006] or a similar structured penalization scheme.
Besides the fixed effects element, the multilevel model provides extensive options to account for statistical uncertainty via the specification of random effects.
Inappropriate model specification of random effects can compromise inference.
