Calculate total mMETs per person in the baseline population based on non-travel PA and active travel for each scenario
Details
This function performs the following steps:
extract all people from the trip set with an active travel (walk or cycle) stage mode (non-ghost trips only)
calculate the weekly time spent on active travel
for each scenario:
scale the non-travel mMET value for the people in the baseline population by the BACKGROUND_PA_SCALAR to adjust for any biases in the PA data
calculate the total cycling and walking mMET values for each relevant person in the trip set and scale up to a week
add the active travel mMET to the non-travel mMET values for each person in the baseline population
create one dataframe with total MMET for all people in the baseline population for all scenarios