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Maths SL IA on SIR Model help

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I have been using equations:

dS/dt (rate of change in susceptible people 

dR/dt (rate of change of recovery people)

dI/dt (rate of change of infected people)


After calculations are made, I get the following values:

dS/dt = -937

dR/dt = 6491

dI/dt = -5540

The samples with SIR model that I've seen before all have a positive dI/dt value, I wanted to ask if the value for this can be negative?

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