I'm using a cross sectional data in 2015, and have a poverty rate variable collected in different years according to case's region.
ID Region Collection time of poverty rate Poverty rate (problematic variable) Other variables (collected in 2015)
1 a 2014 11%
2 a 2014 13%
3 a 2014 15%
4 b 2014 13.50%
5 b 2014 11%
6 c 2015 13%
7 c 2015 14%
8 d 2013 13%
9 d 2013 23%
10 d 2013 24%
Can i add this variable to my model? If i can, how can i fix this problem? Can i solve this problem by adding regional fixed effect?