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2006 Dec 01
1
Box Tidwell / Error Message
Dear R-Users,
I used the box.tidwell () function of the car Package.
When I used the following formula:
semi.sub.in.mi1.boxtidwell_h<-box.tidwell(RENT_LG ~ I(age+1)+I(age2+1)+X06A
+ I(X08B+1) + I(X22+1) + I(X24+1) + X31A, ~B_YEAR + C_X01 + C_X14 + C_X19 +
C_X29A +C_X21 + C_X23 + D_X12 + D_X17 + D_X18 + D_X25 + D_X27 + D_X30 +
D_X32 + D_X35, data = semi.sub.in.mi1)
everything is fine.
However, when I replaced the time dummy variable:
semi.sub.in.mi1.boxtidwell_h<-box.tidwell(RENT_LG ~ I(age+1)+I(age2+1)+X06A
+...