hwo to measure steepness for a curve - beginner

Hi all,

i am trying to compare several curves for their "steepness". The
curves i'm dealing with are generated numerically - sets of ordinary
differntial equations and nonlinear.

Each point of a curve represents fraction of a species of interest over
60,000 days. All of curves reach pleateaus before 60,000 days.

i think presenting the time to reach half-maximum will be a good
measure, but am wondering if their are better and more rigorous ways to
represent steepness of a curve.

thank you.

jhonny

.

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