Hi, I am trying to merge household-level data for two different rounds but I keep on getting an error. I have attached the STATA code and the error.

Command: merge m:1 STATEID DISTID PSUID HHID2005 HHSPLITID2005 using "C:\Users\Hammu\Desktop\Merging by including yea r variable\2012 data\Round2HH.dta"

Error: variable IDHH is long in master but str10 in using data. You could specify merge's force option to ignore this numeric/string mismatch. The using variable would then be treated as if it contained numeric missing value.