Hello Statalist

I have troubles with my data and i hope you can help me
My problem is that i have conducted a conjoint dataset. My total number of observations is 1251. In this dataset i have three rounds of 15 different dichotomous variables and that makes 45 diiferent dichotomous variabels. All respondets have answered three different of these. i have reshaped the dataset from long to wide and back to long again so my total numbers of observations increased to 1251x3 =3753. My problem is when i try to combine all my dichotomous variables into one combined dichotomous variabel my total number of observations is 1251 and not 3753. I think the problem is the way stata treats missing values. Because my 1251 observations have answered 3/45 different dichotomous variables, they are treated as missing values in the rest of the variables.

I have tried the replace command:

gen var1=.
replace var1=0 if var21 !=. & var22==0 | var22 !=. & var21==0 .... and so on but it doesn't work

egen var1, totalrow(varlist) will not work in my case either because i want my final variabel to be dichotomous aswell

I hope i have given you enough information to help me with me situation

Best regards

Rasmus