I am working with single year ACS files and have a question regarding comparison with multiyear files.
Using the “RELATED” and “AGE” variables I am trying to figure out the number of adopted children under the age of 3 (meaning those under 1 year old, 1 year old, and 2 years old). I find the following:
2009 - 148,860
2010 - 140,401
2011 - 137,496
A report from the Census uses 2009-2011 multiyear data. It has the number of adoptees under the age of 3 as 137,088. I am trying to figure out if this number is consistent with what I have found and am struggling to grasp my mind around why I would come up with a similar number in 2011 to what ACS has for over a 3 year period. Any explanations will help.