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Sep
24
awarded  Autobiographer
Jun
7
asked Deriving the cumulative density of a four parameter logistic function
Jan
31
comment Describing the bended regions of a four-parameter logistic function
My apologies, my comment was a little sloppy. The plot on the right is indeed $f''(x)$. The vertical red line indicates the derived max value for $f''(x)$ and I have plotted this location on $f(x)$ on the lefthand plot. This method seems to give me a point at the end of the bended region, whereas I'm interested in characterizing the middle of the bended region (it's 'knee').
Jan
30
comment Describing the bended regions of a four-parameter logistic function
This method seems to overestimate what I'm looking for slightly. I've the vertical red line, here shows the value given at f''(x). I'm looking to characterise the portion of the curve that might be described as the 'knee'. Or the point in the middle of the region that appears to have maximum curvature. Cheers.
Jan
29
awarded  Student
Jan
29
asked Describing the bended regions of a four-parameter logistic function