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A sigmoid function is any mathematical function whose graph has a characteristic S-shaped or sigmoid curve. A common example of a sigmoid function is the logistic function , which is defined by the formula: [ 1 ]
Sigmoid means resembling the lower-case Greek letter sigma (uppercase Σ, lowercase σ, lowercase in word-final position ς) or the Latin letter S. Specific uses include: Sigmoid function, a mathematical function; Sigmoid colon, part of the large intestine or colon; Sigmoid sinus, two structures that drain blood from the bottom of the brain
The standard logistic function is the logistic function with parameters =, =, =, which yields = + = + = / / + /.In practice, due to the nature of the exponential function, it is often sufficient to compute the standard logistic function for over a small range of real numbers, such as a range contained in [−6, +6], as it quickly converges very close to its saturation values of 0 and 1.
The left colic flexure or splenic flexure (as it is close to the spleen) is the sharp bend between the transverse colon and the descending colon.The splenic flexure receives dual blood supply from the terminal branches of the superior mesenteric artery and the inferior mesenteric artery.
The sigmoid colon is completely surrounded by peritoneum (and thus is not retroperitoneal), which forms a mesentery (sigmoid mesocolon), which diminishes in length from the center toward the ends of the loop, where it disappears, so that the loop is fixed at its junctions with the iliac colon and rectum, but enjoys a considerable range of movement in its central portion.
is the apparent dissociation constant derived from the law of mass action, is the ligand concentration producing half occupation, is the Hill coefficient. The special case where = is a Monod equation.
Sigmoidal or sigmoid, literally means S-shaped and can refer to: Sigmoid function; Sigmoidal artery; Sigmoid colon This page was last edited on 30 ...
This nonelementary integral is a sigmoid function that occurs often in probability, statistics, and partial differential equations. In statistics, ...