Would anyone be able to advise on the appropriate model and Stata
command syntax for the following analysis?
The dependent variable is gas mileage (mpg), and I wish to determine if
average gas mileage per car type has changed (increased or decreased)
over an eight-year period.
Each observation is a make and model car in a particular year. A given
make and model has from one to eight observations, depending on the
number of years that make and model was produced. Other car features may
be included as potential covariates. The manufacturer couild also be
included in the model.
Perhaps this calls for a multilevel, hierarchical, and/or repeated
measures model. Specific advice regarding how to model the analysis
including command and the specific parameters would be much appreciated.
Variables:
mpg
manufacturer
make
model
year
covariate1
covariate2
covariate3
Many thanks in advance.
Hilllel Alpert
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