
	Where results make sense

Topic: Sigmoid curve

Related Topics

Logistic function

Sigmoid function

Generalised logistic curve

Logistic regression

Exponential growth

Logistic map

Logarithm

Hubbert curve

British House of Commons

Rory Bremner

1977

Bloody Sunday

List of shopping malls

United States

In the News (Sun 15 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	sigmoid - Search Results - MSN Encarta
		The large intestine is divided into the cecum, ascending colon, transverse colon, descending colon, sigmoid colon, and rectum.
		A sigmoid function is a mathematical function that produces a sigmoid curve a curve having an S shape.
		The sigmoid function, also called the sigmoid curve or logistic function, is the function y==1/(1+e...
	encarta.msn.com /sigmoid.html (189 words)

	Sigmoid function - Wikipedia, the free encyclopedia
		A sigmoid function is a mathematical function that produces a sigmoid curve — a curve having an "S" shape.
		In general, a sigmoid function is real-valued and differentiable, having a non-negative or non-positive first derivative, one local minimum, and one local maximum.
		Sigmoid functions are often used in neural networks to introduce nonlinearity in the model and/or to make sure that certain signals remain within a specified range.
	en.wikipedia.org /wiki/Sigmoid_function (305 words)

	Manpage for SV Mazurka Plugin: MzPowerCurve
		The orange curve seems apparently useless in this situation because the slope is barely rising, and the seems to pass through the attack region hardly being affected by it.
		The orange curve also seems to have smeared the sharp attack seen in the raw power curve, with the smearing occurring both before and after the attack onset.
		The second note is not visible in the raw power curve (fl) or the smoothed power curve (orange), but in the smoothed power slope curve (purple) there is a sharp peak identifying the attack onset.
	sv.mazurka.org.uk /MzPowerCurve (2557 words)

	Bifurcation analysis of continuous time dynamics of oscillatory neural networks
		Typically the dynamics of a component is expressed in a linear equation describing temporal and spatial summation, and a nonlinear operator that is a unilateral or bilateral saturation on the sum.
		is a parameter related to the height and slope of the sigmoid curve that describes the wave-to-pulse conversion in a population of cells.
		The other is the asymmetry of the sigmoid, in which excitatory input increases both the output and the forward gain of the population.
	sulcus.berkeley.edu /FreemanWWW/manuscripts/ID8/93.html (5526 words)

	Polymer-thickened liquid abrasive cleaning compositions - Patent 5286405
		Region A is defined as that portion of the sigmoid curve where the viscosity of the total system corresponds approximately to that of the base system and there is a linear relationship between log viscosity and log concentration.
		Region B (lower) is defined as that portion of the sigmoid curve which obeys a power law relationship (the coefficient of which is greater than 1) beneath the point of inflexion.
		Region C is defined as that portion of the sigmoid curve where the viscosity of the total system is greater than that of the base system and there is an essentially linear relationship between log viscosity and log concentration.
	www.freepatentsonline.com /5286405.html (4152 words)

	Life on Mars?
		The curve shows that two distinct types of organisms were present.
		After the growth of the first was attenuated, the second organism went into exponential growth, as indicated by the second, steep portion of the curve.
		While it is desirable to obtain the entire curve, the initial portion is sufficient to establish the presence of life.
	mars.spherix.com /spie2/Reprint22.htm (1446 words)

	Notes9
		The pathway detail is shown by the Sigmoid curve an S shaped curves that begins with a decline then turns upwards before finally peaking and ending with a further decline.
		However the one catch here is that the second curve needs to be started while the original idea is on the way up when ususally the need for change is not felt until the downward slope.
		Sigmoid curves are said to be more noticable in the computer industry.
	myweb.tiscali.co.uk /imawd/Notes9.html (789 words)

	Bioline International Official Site (site up-dated regularly)
		A true sigmoid dose-response curve can be generated only if the various data points on clinical outcome are available for the entire range of the radiation dose, starting from a minimum to a maximum tolerable dose.
		Outcomes were correlated with various demographic and dose-response parameters to identify the most relevant parameter of the sigmoid curve and recognize its implication in management of carcinoma of the cervix.
		Curve fits were generated from the scatter plots of dose-response separately between patients based on known prognostic factors, which could have an impact on the outcome.
	www.bioline.org.br /request?cn04004 (2817 words)

	Ask Jeeves: Search Results for "Sigmoid"
		Description: The sigmoid colon is the extension of the mobile descending colon that curves antero-inferiorly from the left side of the abdomen...
		The double sigmoid is a function similar to the sigmoid function with numerous applications.
		Sigmoid is a database of models of cellular signaling and metabolic pathways.
	partner.ask.com /megadirectory?q=Sigmoid (162 words)

	DREAM-World: The Pattern of Variation
		In a typical Sigmoid curve, the value of a variable (say population) initially increases exponentially, but instead of continuing unchecked, the rate of growth reaches a maximum and then gradually decreases to zero.
		It is also a characteristic of S-shaped curves that the ultimate maximum value of the variable is twice that at the inflection point --- so that, in the above example, the ultimate value of world population in the distant future would be 12 billion.
		Sigmoid curves can also be used to represent variables that are decreasing as well as those that are increasing.
	www.open2.net /opensaturday/pages/schedule/july/trans/dreamworld/sigmoid.htm (446 words)

	Population Growth of Lemna and Azolla
		Although the experiment is not perfectly in accordance with the initial hypotheses because of the curve of the mean total, the experiment in general, follows the rules that was introduced in the introduction.
		The logistic estimate of the population size is a negative exponential curve.
		The technique to find the best sigmoid curve seems to be a good method, but that is only an approximation because maybe it represents the mean total or maybe not.
	www.sftext.com /ecology/lemnaazolla.html (1583 words)

	The operational model of agonist action
		They began with the observation that dose-response curves often have a sigmoidal shape with a Hill Slope of 1.0, (the curves are hyperbolas when response is plotted against agonist concentration, sigmoidal when response is plotted against the log of concentration).
		Any symmetrical dose-response curve is defined by four parameters: Bottom (response with no agonist), Top (response at very high concentrations), EC (concentration of agonist needed to provoke a response halfway between Bottom and Top) and the Hill Slope.
		Instead, the dose-response curve of the partial agonist curve is compared to the dose-response curve of the full agonist.
	www.curvefit.com /operational_model_.htm (1832 words)

	Neural Networks: The Sigmoid Function
		The sigmoid function is so-called because it is shaped like one form of the Greek letter Sigma.
		This works on the bold assumption that any section of the sigmoid curve, between two successive tabulated plots, is a straight line.
		An exerciser for the 'C' version of Sigmoid() was therefore written and exercised within the Microsoft Programmer's Workbench development environment using Microsoft C 6.00 as follows.
	users.computerweekly.net /robmorton/projects/neural/sigmoid.htm (2006 words)

	Logistic function information - Search.com
		The sigmoid curve shows early exponential growth for negative t, which slows to linear growth of slope 1/4 near t = 0, then approaches y = 1 with an exponentially decaying gap.
		Cohen explains that Verhulst attempted to fit a logistic curve based on the logistic function to 3 separate censuses of the population of the United States of America in order to predict future growth.
		Nevertheless, the logistics curve has been a staple of models both mathematical and sociological, for instance the transformation theory of George Land, which uses the concept of the S-curve to prescribe appropriate business behaviour in various stages of a technology's growth.
	domainhelp.search.com /reference/Logistic_function (958 words)

	Ira Shafran, M.D., P.A. -
		The sigmoid colon mucosa is generally a darker shade of pink with less prominent vascularity and the salient feature is the presence of muscular valve.
		The junction of the sigmoid and descending colon usually occurs between 40 cm and 50 cm from the anus.
		Within the sigmoid they are recognized as 3 - 5 mm circular openings in the central portion of the short haustral segment situated between the enlarged valvulae.
	www.shafran.net /flex.html (4792 words)

	Contact Lens Spectrum
		Second, adjacent to the base curve is a patented sigmoid-shaped curve that controls the amount of lens clearance across the central cornea.
		A shallower sigmoid in the return zone brings the base curve into closer apposition to the cornea, where a deeper sigmoid in the return zone results in greater apical clearance.
		The flat K and the spherical component of the refractive error (vertexed to the plane of the cornea) are cross-referenced with the Paragon CRT Initial Lens Selector.
	www.clspectrum.com /article.aspx?article=12252 (1417 words)

	Introduction to tropical fish stock assessment - Part 1: Manual (French version not published)
		If the basic assumption that the selection curves are shaped like normal distributions is not fulfilled the estimation of the numbers in the population must be restricted to the part of the curve for which the assumption is approximately fulfilled.
		Using the descending slope of this curve to estimate total mortality from the length-based catch curve analysis would lead to an overestimate of Z. Before using any gill net data for estimation of growth parameters or mortality rates, they should be critically examined.
		Curve R is the "recruitment curve", curve G is the "gear selection curve", and curve S is the "resultant curve".
	www.fao.org /docrep/W5449E/w5449e08.htm (7735 words)

	The CEO Refresher - Life Beyond the Sigmoid Curve (Site not responding. Last check: 2007-10-13)
		The curve sums up the story and time line of life itself; we start slowly, we experiment and falter, we then grow rapidly, then wax, and wane.
		Leaders who live beyond the curve gain a shared understanding of the paradox very early in the cycle and actively create the next wave with a clear vision and sense of purpose.
		With reference to a discussion of the sigmoid curve in The Age of Paradox, by Charles Handy, Harvard Press, Boston, 1994.
	www.refresher.com /!paradox.html (867 words)

	Quality Digest Magazine/Blanchard Article
		A study of the typical development curve shows that there is a wisdom in anticipating the drop-off before it begins to occur.
		The point on the first curve designated as "a" is the "observation point." It is the stage at which a different plan needs to be put into effect.
		Develop the perspective and discipline necessary to allow funds to be siphoned away from the curve they currently are leading (the first curve) to one that they may not be leading (the second curve).
	www.qualitydigest.com /nov96/blanchrd.html (750 words)

	PopEcol Lect 23
		Remember, however, that the sigmoid curve is a plot of N(t) against t, the solution of the differential equation Eqn 23.1.
		Of the three curves, it may be the most plausible -- and it can have the scary, puzzling consequence of an "irreversible" decline in the stable population size.
		Although it is not mathematically similar, a somewhat analogous alternation of effects occurs in some trophic interactions (look back at the sigmoid functional response curve and the coyote, scrubland bird examples of Lecture 21 and forward to the examples in Lecture 29 on regulation and trophic interactions).
	www.uwyo.edu /dbmcd/popecol/marlects/lect23.html (2158 words)

	Target Difficulty (Site not responding. Last check: 2007-10-13)
		You should normally use the standard curve for larger tournaments (with more than 30 players), and for any tournament where there are enough stronger players (5 dan and up) to compete with each other.
		The standard curve sets target difficulty as a function of the average rating of the two players, following a sigmoid curve from a low target at 7 dan to a high target at 7 kyu and below.
		The flat curve is not appropriate for championship tournaments.
	ourworld.compuserve.com /homepages/accelrat/Target.htm (535 words)

	One-Site Versus Two-Site Competition Experiments
		The characteristics of a competition curve with one-site binding are a sigmoid curve with:
		The characteristics of a competition curve with two-site binding is a sigmoid curve with
		Hill slope is the slope of the curve
	www.unmc.edu /Pharmacology/receptortutorial/competition/one_two.htm (758 words)

	Untitled Document
		Dicraeosaurus hansemanni is a remarkably well preserved sauropod, beautifully mounted at the Humboldt Museum in Berlin with a distinctive sigmoid curve to the neck, where it dips down at the shoulder, then rises at mid neck to descend again at the head.
		Sauropod necks in general are usually shown with a more-or-less swan-like curve, this one being less obvious because of the significant downslope of the anterior dorsal vertebral column.
		Note that the neck pose as depicted in Janensch was very likely attainable by the living Dicraeosaurus; this taxon could have reached this sigmoid curve simply by dorsiflexion at the base of the neck (note that the natural droop near the neck is actually close to the undeflected pose!).
	www.cs.uoregon.edu /~kent/DinoMorph/Dicraeosaurus (568 words)

	Definition of Sigmoid curve
		The name is due to the sigmoid shape of its graph.
		The sigmoid curve shows early exponential growth for negative t, which slows to linear growth of slope 1/4 near t = 0, then approaches y = 1 with an exponentially decaying gap.
		The logistic function is the inverse of the natural logit function and so can be used to convert the logarithm of odds into a probability; the conversion from the log-likelihood ratio of two alternatives also takes the form of a sigmoid curve.
	www.wordiq.com /definition/Sigmoid_curve (452 words)

	Manual on estimation of selectivity for gillnet and longline gears in abundance surveys
		A selection curve may be defined as a curve, giving for each size of fish of a given species, the proportion of the population, which is caught and retained by a unit operation of the gear.
		Including the effect of prey size preference implies that the selectivity curve should follow a bell shaped pattern with the ascending leg of the curve being caused by the morphometrics and the descending leg of the curve being due to an avoidance of larger bait sizes.
		Gillnet selection curves are either bell-shaped or two-peaked, where the latter formulation is useful when the catch are taken by two distinct catch processes.
	www.fao.org /docrep/005/x7788e/X7788E03.htm (1672 words)

	Smart Tool
		Basically, the sigmoid model is a complex variation of an extrapolation model and is more accurate than other methods for a forecasting short- and long-term growth for cities experiencing extraordinary growth and an estimated build-out population.
		Three basic steps were employed to apply the sigmoid model in Cape Coral: First, an upper limit of growth was set as a key variable in developing Cape Coral's growth curve.
		On August 26, 2002 the Cape Coral mayor and city council adopted the forecasted population estimates based on the sigmoid curve, and authorized the application of the Interactive Growth Model for planning purposes.
	www.sactaqc.org /Resources/Visioning/Smart_Tool.htm (3044 words)

	Training and Simulating a Neutral DotNetwork in C# (Site not responding. Last check: 2007-10-13)
		The sigmoid function is shown below which approaches 1 for large values of x and 0 for very small values of x.
		In the first part of the method, each node of the input layer is multiplied by the weights between the input and hidden layer and a sigmoid is applied to obtain the form the activation value of the hidden node.
		In the second part, each node of the hidden layer is multiplied by the weights between the hidden and output layer and a sigmoid is applied to obtain the form the activation value of the output node.
	www.c-sharpcorner.com /Code/2004/Jan/NeuralNetSim.asp (2881 words)

	Anticipating and Leveraging the Future:Surfing the Sigmoid Curve
		In Section 1 we introduce key concepts technology limits, discontinuity, sigmoid curves, paradigm shift, and a strategy to identify and pioneer a paradigm shift.
		And the S Curve is a is a powerful tool to understand and visualize technology evolution and limits.
		S Curve is sometimes referred to as the Sigmoid curve[3].
	bluehawk.monmouth.edu /monmouth/academic/dna/sigmod.htm (2215 words)

	Sigmoid growth and the assessment of hormesis: A case for caution.
		Sigmoid growth and the assessment of hormesis: A case for caution.
		Recent advances in procedures for the analysis of sigmoid curves have provided some sensitive methods of detecting and evaluating hormesis in the growth responses of organisms exposed to a variety of stressors.
		When applied to growth data for cypress tree seedlings and two species of waterfowl exposed chronically to low levels of a variety of stressors, these analyses revealed that curve shape was more likely to change in response to stress than were either asymptotic size or growth rate.
	www.uga.edu /srel/Reprint/1135.htm (226 words)

Try your search on: Qwika (all wikis)