Description Traci Arthur-Hartranft 2010-08-26 15:40:19 EDT

Created attachment 177558 [details]
spreadsheet showing example results; yellow columns are copied from STEM .csv files, others were calculated; red text was expected to match more closely

This is based on a simple case of a DeterministicSEIRDisease model where there are no changes in population (natural birth and death rate=0), no disease deaths (infectious mortality rate=0) and no movement from R back to S (immunity loss rate=0). 

Incidence is stated to be the transition from S to E in a time step. Given the simple example above, movement from S to E should be constrained to be equal to the reduction in S between time steps. 

But the calculated S to E values can be off by up to 1000 or so from the Incidence file results. A summary is in the attached spreadsheet for a single county where I started with 200 infected people.