Hi Alice, 
hi all,
I have the same problem.... in addition to the below question I would like to know whether and how I can generate  a string variable out of say 3 or more dummy variables.
cheers,
Katy
 "ALICE DOBSON" <[email protected]>
"ALICE DOBSON" <[email protected]>
Dear All,
I use stata 9 and have a very simple question.
I have a categorical independent variable [Level of Investment] in an 
unbalanced panel of firms. All firms fall within the three categories: Low, 
Medium, and High investments. I code them as 1 or 0 for each category, which 
are exclusive. If a firm has low level of investment then it canot have 
medium or high.
My question is how do I explain to Stata that this is a categorical variable 
and which of the three should be the base dummy?
Best,
Alice.
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