i.e., the stratum variance Q h for each stratum h is the average of the stratum variance Q hj for each time stamp j ranging from 1 to T. An alternative to the summation operation is to use dissimilarity measures.
It is assumed to be identical across strata (no interaction between the exposure and the pairs) and thus to be implicitly common for the whole exposed population: exp γ t is defined as the population-weighted average of the stratum-specific hazard ratios.
A weighted average of the stratum-specific estimates was then calculated (Table 5, "stratified Cox column").> Stratifying the patients into propensity score quintiles resulted in an improved balancing of patient characteristics between the ADT/no ADT groups compared to the initial differences prior to stratification seen in Table 1.
In Fig. 4 an average spectrum of the stratum corneum is overlaid with the average localized to the small spatial region highlighted in Fig. 3c, labeled Factor 2. The average spectrum labeled "ordered lipid" has strong bands near 1,058, 1,130, 1,296, 2,880, and 2,850 cm−1 (Fig. 4b and c).
D is the average depth of the stratum boundary, and h(x') is the deviation of the boundary from the average.
When studies reported estimates by strata of age that were narrower than the age-agroups we defined for analysis, it corresponded to the average of the prevalence in the narrower age strata, weighted by the corresponding number of participants.
Mantel-Haenszel applies to binary outcomes, and involves calculating an odds ratio within each stratum, then calculating a weighted average of the results to get a final estimate.
The black dots are the centers of the strata.
Top image: (Above: Part of the Strata Series, Sally Weber).
(See Methods for explanation of the strata).
