Hi,
I am doing an analysis. My analysis showed that for example is "kidney admissions- all ages group" is significantly associated with daily temperature, however, in agewise groups, it does not show significant value for any of the age groups.
What could be the reasons?
I understand that there might have been omitted variable bias, you are partly addressing when exploring the association at a lower level.
Sample size effects significance in any statistical test. As you go to subgroups, the sample size shrinks. If the data were distributed identically in the group and the subgroup, the confidence interval would be narrower in the group than in the subgroup because the group includes more cases.
reduction of the impact of synerygy
strength in numbers and matter
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