Hi, I'm in need of help for how to weight observations in a regression. I am trying to estimate the expected level of hospitalizations in a year for older individuals who receive care in the home provided by the municipality. The problem is that the individuals can receive care in a single month, two months, three months and so on during the year. Only the hospitalizations during the months receiving care are included in the regression. The problem is that some people (eg. those receiving care in all 12 months) are more exposed to hospitalizations than the individuals receiving care for fewer months. I've tried to use PROC GENMOD using a POISSON distribution and using the WEIGHT statement. A person who receives 12 months of care has the weight 1 while a person receiving one month of care has the weight 1/12 and so on. I'm not quite sure this is the right way to go about it. Can anyone help? Fun fact: Fewer than 50% receive care the whole year. /Mette
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