In my Stata data set, the "alternative" variable consists of 4 modes including pier, private, beach and charter.
I want to generate new variable y as follows:
We collapse the model to three alternatives and order the alternatives, with y = 0 if fishing from a pier or beach, y = 1 if fishing from a private boat and y = 2 if fishing from a charter.
The descriptions of variables in the dataset is as follows:

Note: I don't understand from the dataset. And I get error related to type of the variable while generating variable I download the dataset from the website https://www.stata-press.com/data/musr/musr.zip The data name is mus15data
How can I generate the variable y?
I want to generate new variable y as follows:
We collapse the model to three alternatives and order the alternatives, with y = 0 if fishing from a pier or beach, y = 1 if fishing from a private boat and y = 2 if fishing from a charter.
The descriptions of variables in the dataset is as follows:
Note: I don't understand from the dataset. And I get error related to type of the variable while generating variable I download the dataset from the website https://www.stata-press.com/data/musr/musr.zip The data name is mus15data
How can I generate the variable y?
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