The fitness method [FitnessMethodRMSE](https://github.com/FireDynamics/propti/blob/8450532fd2e37536a071ef0b6c59ea13ee86539a/propti/fitness_methods.py#L15) does not take the `relation.model.factor` into account, when calculating the RMSE.
The fitness method FitnessMethodRMSE does not take the
relation.model.factorinto account, when calculating the RMSE.