Dear Users
I have a problem with how to test the equality of coefficients of three
regressions. I have a sample of 600,000 enrollees in one of our sick
funds in year 2004.
I have the cost of each individual including those who died during the
year. Some of the decedents died in January some in April and some in
December. I calculated the cost of the last year of life in two ways.
First, I just multiplied the cost by the inverse of the proportion of
year the individual lived, e.g. if some one died in February I
multiplied his cost by 12/2 (Since the last months of life are much
expensive than the first months of the year this method overestimates
the cost) and I called it c1.
I also multiplied the cost by a different weight that takes care of this
problem and called it c2.
The original cost is called c (the cost as is)
I regressed:
C=a + b1*age + b2*sex + b3*survive
C1=a1 + b11*age + b12*sex + b13*survive
C2=a2 + b21*age + b22*sex + b23*survive. (Survive is a dummy variable)
The only difference between the regressions is how I have calculated the
cost. The right side of the equation is the same.
I want to test the coefficient equalities: b3=b13=b23
How can I do it? Could I use suest? If so, do I have to adjust to the
fact I use the same sample?
Thanks in advanced
David
David Messika
The Health Economics Unit
The Gertner Institute for Epidemiology and Health Policy Research
Chaim Sheba Medical Center
Ramat-Gan, Israel
(: 972-3-5303935 (: 972-3-5303277
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