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sigmoid
(redirected from Sigmoid curve)

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See: circuitous


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Sigmoid curves (RAMP curves) showing relationships between reflex impairment and mortality were fitted by using SigmaPlot vers.
[lambda]] (1) where y represents the time-series to which curve fitting is applied, t is time, and other parameters dictate the particular details of the sigmoid curve (slope or growth rate and inflection point).
The recently proposed 3-stage theory (Contractor/Kundu/Hsu 2003, Lu/Beamish 2004, Thomas/Eden 2004) can reconcile these seemingly diverse results by suggesting that linear, U-shaped and Inverted-U-shaped results are simply subsets of the general 3-stage sigmoid curve shown in Figure 3.
 
 
 
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