Fixed cost parameter for returning to school for KW97 and KW2000.

[tobiasraabe]

Current behavior

• The return to school cost parameter have bad names.
• Because of that we potentially mixed them up and applied the cost to return to high school (23k) to individuals returning to college (10k).

Desired behavior

Fix it.

Solution / Implementation / References

The parameters are now called returns_to_high_school and returns_to_college which should express that the person has not been to school the previous period and that she has not high school or college diploma, respectively.

A high school diploma is achieved with 12 years of schooling (g(a) >= 12) and a college diploma with 16 years.

The formulas for the parameters are given in the appendix of KW97 as rc1 and rc2:

Their description is given in table 8:

Todo

• Review whether the documentation needs to be updated.
• Document PR in CHANGES.rst.

[tostenzel]

The values in the respy params dataframe returns_to_highschool and returns_to_college, i.e. -2.3283e+4 and -1.07e+4 correspond perfectly to -rc1 and -rc2 in KW97.