Rolf Dalin <[EMAIL PROTECTED]> wrote:
> Brad Anderson wrote:
>> I have a continuous response variable that ranges from 0 to 750. I only
>> have 90 observations and 26 are at the lower limit of 0,
> What if you treated the information collected by that variable as really
> two variables, one categorical variable indicating zero or non-zero value.
> Then the remaining numerical variable could only be analyzed conditionally
> on the category was non-zero.
> In many cases when you collect data on consumers consumption of
> some commodity, you would end up in a big number of them not
> using the product at all, while those who used the product would
> consume different amounts.
IIRC, your example is exactly the sort of situation for which Tobit
modelling was invented.
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