I have to pool the Census ACS 2006 through ACS 2008 files.
I am a beginner and therefore would appreciate if anyone could explain the following:
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Is it fine to use 2008 ACS 3yr in this case?
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If not, how should I proceed ahead?
The 3-year sample is likely to be your best bet, since it can be used immediately for analysis without further adjustment. I suggest reading this FAQ on ACS multi-year samples.