Hello,   I was hoping someone could help me with some codes to determine the mean across positive values variables (MPOS). For example, MPOS (Year=2000)= avg (var1+var4) MPOS (Year=2001)= avg (var2+var3) MPOS (Year=2002)= avg (var1+var2) ...... Year Var1 Var2 Var3 Var4 MPOS 2000 23 -10 -5 22 22.5 2001 -1 10 33 -20 21.5 2002 10 20 -30 -10 15 2003 20 -10 10 -10 15 2004 8 10 3 -12 7 2005 10 -5 -23 -11 10 Thanks! ... View more