Hi Stata users
I am working with pooled cross section data (randomly sampled 26,000 SMEs over the last 10 years). The SMEs were surveyed every year to know about the status of their investment in R&D, sales, productivity etc. The responses were like 10,000 SMEs said "productivity increased" , 10,000 said "productivity decreased" 6,000 said " don't know". I want examine whether investment in R&D is correlated with productivity or sales. What type of regression model I would need to use for such data and how to convert Increased, Decreased, Don't know when using them in regression analysis. Do I need to use svy command and set up sampling design before doing any analysis of such data in Stata?
I appreciate your advice.
Thanks.
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