I want to analyze the associaiton between daily air pollution and hospital addmission using the time-series design. Typically, previous studies would use 0-7 days lag. However, I found positive associations between air pollution and hospital addmission at lag 2 day, but negative associaitons at lag 6 day and lag 7 day. I'm confused. Is it okay if I only perform 0-5 days lag?
Proloy Barua lag2 means the single day that is 2 days before the hospital admission. lag02 days mean the average level of 2 days before the hospital admission.
Zhaoyuan Li Thanks for the clarification. I think during weekend (day 6th, 7th of a week) the level of air pollution might be less compared to weekdays. I would revisit the data whether this the case or it is very context specific. Lets wait for other opinion.
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