It emphasizes representativeness of the sample with regard to the population of interest, the sampling method, sample size, participation rate, access, validation, use of diagnostic criteria and description of timeframe.
Model specification: Model specification process should be reported, including prior knowledge of the theoretically plausible models, prior knowledge of the positive or negative direct effects among variables, data sampling method, sample size, and model type.
The choice of an appropriate method, sample size, and allocation of cases and controls are serious concerns.
Independent of the method, sample size is an important factor and, in the present study, a limiting factor in relation to association analyses.
Study design, sampling method, sample size, response rate and study instruments were reviewed critically to provide a deeper understanding of the data presented in each paper.
Lack of clear cut definition of dyspepsia, H. pylori diagnostic method, sample size, social and economic factors could be some of the possible reasons for these variations.
Figure 1 Histograms and fitted distributions of M-estimates residuals with different explanatory variables and M-methods (sample size is (pmb{n=1000}) ).
This dissimilar result might be because of using different methods, sample size, climate factor, geology, soil type, dissolution of minerals from lithological composition, and addition of chemical fertilizers.
Figure 2 Histograms and fitted distributions of M-estimates residuals with different explanatory variables and M-methods (sample size is (pmb{n=1000}) ). Figure 3 A comparison fitted distribution functions of residuals and assumed NSD errors (sample size is (pmb{n=1000}) ).
Data were recorded about the author, year of the study, sample, methods, sample size, study focus, and main findings.
The standardized questionnaire and survey methods, sample size calculation, data entry, data management, and statistical analysis methods are all described in depth in the Overview article.
