S-curve

English

$f(x)={\frac {1}{1+e^{-x}}}={\frac {e^{x}}{1+e^{x}}}$

Etymology

From the shape, which resembles a vertically compressed letter S.

Noun

S-curve (plural S-curves)

1. Logistic growth, or a graph detailing it.

   Synonym: logistic curve

2. Reverse curve
   • 2016 March 15, Justin Breen, “Remember The Old Lake Shore Drive 'S' Curve? It's Been Gone For 30 Years”, in DNAinfo‎^[1], archived from the original on 29 July 2023:

     The current S-curve includes much gentler bends starting around Randolph Street and ending just before Monroe Street.

   • 2024 April 17, Curtis Segarra, “NMDOT hosting public meeting on ‘S-curve’ portion of Albuquerque I-25”, in KRQE‎^[2]:

     The so-called “S-curve” on I-25 is a notoriously dangerous stretch of freeway just south of the Big-I.

See also

• J-curve

Anagrams

• cruves, curves