NotImplementedError should be raised in the Interface class init method if the class is Instance and not a subclass of Instance. This will prevent the creation of a 'bare' interface.

A function to create models and associated data of arbitrary size (number of records, number of choices, number of parameters) would be helpful for benchmarking purposes.

To simplify this in the fist instance perhaps assert that utility functions for all alternatives depend on all variables and there are no choice dependent variables.

The ALOGIT input file has a maximum line length of 77

- is a special character in the ALOGIT input file used for mathematics.

This could make it easy to accidentally modify the model and cause unexpected errors when creating a new interface (or recreating the same interface).

The models should be passed as an argument only to methods that require it.

For each interface there should be a uniform way to query results and run information such as final log-likelihood and estimation time.

The intercepts need to be defined as coefficients in the ALOGIT input file.

Input data files for ALOGIT must only contain one kind of number data (real or integer).

The constructor for interfaces should be uniform to aid in creating benchmarking tools. Additional parameters which may be required (i.e. the ALOGIT path ) could be passed in the generic **kwargs manner.

Some column labels are input multiple times as literal strings. It would be better to create a module level variable

The character limit for variables declared in the alo file is 10.