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Jan 16, 2019 at 13:07 comment added JayZ We had a low Response rate.The sample collected from the first Invitation letter were mostly old women (13 % Response rate). After sending the first reminder letter, the Overall Response rate increased by 3 percent, and we added relatively more men to that sample. But were they enough to Change the Overall Odds Ratio? after the second reminder letter, Overall Response rate again increased but by 1 percent, again they more mostly men and younger participants, by comparing the Odds after every RL, I hope to conclude that the 2nd and 3rd reminder letters were maybe unnecessary .
Jan 14, 2019 at 14:38 comment added gung - Reinstate Monica Can you clarify further: Are you wondering if the relationship between your explanatory variables & your response variable differs in these groups, or if the extra participants were needed for adequate power? Are you wondering how the different groups differ in their distributions of explanatory variables?
Jan 14, 2019 at 14:21 history reopened gung - Reinstate Monica
Jan 14, 2019 at 14:21 history edited gung - Reinstate Monica CC BY-SA 4.0
clarified situation in title; added tags; formatted; eded for English
Jan 14, 2019 at 13:40 review Reopen votes
Jan 14, 2019 at 14:21
Jan 14, 2019 at 13:21 history edited JayZ CC BY-SA 4.0
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Jan 14, 2019 at 12:49 history closed Peter Flom Needs details or clarity
Jan 14, 2019 at 11:47 history asked JayZ CC BY-SA 4.0