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{{Probability distribution| | |||
name = Shifted Gompertz| | |||
type =density| | |||
pdf_image =[[File:Shiftedgompertz distribution PDF new.png|325px|Probability density plots of shifted Gompertz distributions]]| | |||
cdf_image =[[File:Shiftedgompertz distribution CDF new.png|325px|Cumulative distribution plots of shifted Gompertz distributions]]| | |||
parameters =<math>b>0</math> [[scale parameter|scale]] ([[real number|real]])<br/><math>\eta>0</math> [[shape parameter|shape]] (real)| | |||
support =<math>x \in [0, \infty)\!</math>| | |||
pdf =<math>b e^{-bx} e^{-\eta e^{-bx}}\left[1 + \eta\left(1 - e^{-bx}\right)\right]</math>| | |||
cdf =<math>\left(1 - e^{-bx}\right)e^{-\eta e^{-bx}}</math>| | |||
mean =<math>(-1/b)\{\mathrm{E}[\ln(X)] - \ln(\eta)\}\,</math> | |||
where <math>X = \eta e^{-bx}\,</math> and | |||
<math>\begin{align}\mathrm{E}[\ln(X)] =& [1 {+} 1 / \eta]\!\!\int_0^\eta \!\!\!\! e^{-X}[\ln(X)]dX\\ &- 1/\eta\!\! \int_0^\eta \!\!\!\! X e^{-X}[\ln(X)] dX \end{align}</math>| | |||
median =| | |||
mode = <math>0 \text{ for }0 < \eta \leq 0.5</math><br/> <math>(-1/b)\ln(z^\star)\text{, for } \eta > 0.5</math><br/><math>\text{ where }z^\star = [3 + \eta - (\eta^2 + 2\eta + 5)^{1/2}]/(2\eta)</math>| | |||
variance =<math>(1/b^2)(\mathrm{E}\{[\ln(X)]^2\} - (\mathrm{E}[\ln(X)])^2)\,</math> | |||
where <math>X = \eta e^{-bx}\,</math> and <math>\begin{align}\mathrm{E}\{[\ln(X)]^2\} =& [1 {+} 1 / \eta]\!\!\int_0^\eta \!\!\!\! e^{-X}[\ln(X)]^2 dX\\ &- 1/\eta \!\!\int_0^\eta \!\!\!\! X e^{-X}[\ln(X)]^2 dX \end{align}</math>| | |||
skewness =| | |||
kurtosis =| | |||
entropy =| | |||
mgf =| | |||
char =| | |||
}} | |||
The '''shifted Gompertz distribution''' is the distribution of the largest of two independent [[random variable]]s one of which has an [[exponential distribution]] with parameter b and the other has a [[Gumbel distribution]] with parameters <math>\eta</math> and b. In its original formulation the distribution was expressed referring to the Gompertz distribution instead of the Gumbel distribution but, since the Gompertz distribution is a reverted Gumbel distribution ([[truncated distribution|truncated]] at zero), the labelling can be considered as accurate. It has been used as a model of [[Diffusion of innovations|adoption of innovations]]. It was proposed by Bemmaor (1994). | |||
== | == Specification == | ||
===Probability density function=== | |||
The [[probability density function]] of the shifted Gompertz distribution is: | |||
:<math> f(x;b,\eta) = b e^{-bx} e^{-\eta e^{-bx}}\left[1 + \eta\left(1 - e^{-bx}\right)\right] \text{ for }x \geq 0. \,</math> | |||
where <math>b > 0</math> is the [[scale parameter]] and <math>\eta > 0</math> is the [[shape parameter]] of the shifted Gompertz distribution. | |||
===Cumulative distribution function=== | |||
The [[cumulative distribution function]] of the shifted Gompertz distribution is: | |||
:<math> F(x;b,\eta) = \left(1 - e^{-bx}\right)e^{-\eta e^{-bx}} \text{ for }x \geq 0. \,</math> | |||
The | == Properties == | ||
The shifted Gompertz distribution is right-skewed for all values of <math>\eta</math>. It is more flexible than the [[Gumbel distribution]]. | |||
===Shapes=== | |||
:<math> | The shifted Gompertz density function can take on different shapes depending on the values of the shape parameter <math>\eta</math>: | ||
* <math>0 < \eta \leq 0.5\,</math> the probability density function has its mode at 0. | |||
* <math>\eta > 0.5\,</math> the probability density function has its mode at | |||
::<math>\text{mode}=-\frac{\ln(z^\star)}{b}\, \qquad 0 < z^\star < 1</math> | |||
:where <math>z^\star\,</math> is the smallest root of | |||
::<math>\eta^2z^2 - \eta(3 + \eta)z + \eta + 1 = 0\,,</math> | |||
:which is | |||
::<math>z^\star = [3 + \eta - (\eta^2 + 2\eta + 5)^{1/2}]/(2\eta).</math> | |||
== | == Related distributions == | ||
If <math>\eta</math> varies according to a [[gamma distribution]] with shape parameter <math>\alpha</math> and scale parameter <math>\beta</math> (mean = <math>\alpha\beta</math>), the distribution of <math>x</math> is Gamma/Shifted Gompertz (G/SG). When <math>\alpha</math> is equal to one, the G/SG reduces to the [[Bass model]]. | |||
== See also == | |||
* | *[[Gumbel distribution]] | ||
* | *[[Generalized extreme value distribution]] | ||
* | *[[Mixture model]] | ||
*[[Bass model]] | |||
*[[Gompertz distribution]] | |||
== References == | |||
{{No footnotes|date=April 2012}} | |||
* | *{{Cite book | surname=Bemmaor | given=Albert C. | year= 1994 |pages=201–223| chapter=Modeling the Diffusion of New Durable Goods: Word-of-Mouth Effect Versus Consumer Heterogeneity | editor=G. Laurent, G.L. Lilien & B. Pras | title=Research Traditions in Marketing | publisher=Kluwer Academic Publishers | place=Boston| ISBN=0-7923-9388-0}} | ||
*{{Cite book| surname1=Chandrasekaran| given1=Deepa | surname2=Tellis| given2=Gerard J. |year= 2007 |volume=3| chapter=A Critical Review of Marketing Research on Diffusion of New Products | editor=Naresh K. Malhotra | title=Review of Marketing Research | publisher=M.E. Sharpe | place=Armonk | pages = 39–80 | ISBN = 978-0-7656-1306-6}} | |||
*: | *{{Cite journal | ||
* | | last1 = Dover | ||
* | | first1 = Yaniv | ||
| title = Network Traces on Penetration: Uncovering Degree Distribution From Adoption Data | |||
| first2 = Jacob |last2=Goldenberg | |||
| first3 = Daniel |last3=Shapira | |||
| journal = Marketing Science|doi=10.1287/mksc.1120.0711 |year=2012 }} | |||
*{{Cite journal | |||
| last1 = Jimenez | |||
| first1 = Fernando | |||
| title = A Note on the Moments and Computer Generation of the Shifted Gompertz Distribution | |||
| first2 = Pedro |last2=Jodra | |||
| journal = Communications in Statistics - Theory and Methods | |||
| volume = 38 | issue = 1 | |||
| pages = 78–89 | |||
| year = 2009 | |||
| doi=10.1080/03610920802155502}} | |||
*{{Cite journal | |||
| last1 = Van den Bulte | |||
| first1 = Christophe | |||
| title = Social Contagion and Income Heterogeneity in New Product Diffusion: A Meta-Analytic Test | |||
| first2 = Stefan |last2=Stremersch | |||
| journal = Marketing Science | |||
| volume = 23 | issue = 4 | |||
| pages = 530–544 | |||
| year = 2004 | |||
| doi = 10.1287/mksc.1040.0054}} | |||
{{ProbDistributions|continuous-semi-infinite}} | |||
[[Category:Continuous distributions]] | |||
[[Category: | |||
Revision as of 22:01, 15 August 2014
Template:Probability distribution The shifted Gompertz distribution is the distribution of the largest of two independent random variables one of which has an exponential distribution with parameter b and the other has a Gumbel distribution with parameters and b. In its original formulation the distribution was expressed referring to the Gompertz distribution instead of the Gumbel distribution but, since the Gompertz distribution is a reverted Gumbel distribution (truncated at zero), the labelling can be considered as accurate. It has been used as a model of adoption of innovations. It was proposed by Bemmaor (1994).
Specification
Probability density function
The probability density function of the shifted Gompertz distribution is:
where is the scale parameter and is the shape parameter of the shifted Gompertz distribution.
Cumulative distribution function
The cumulative distribution function of the shifted Gompertz distribution is:
Properties
The shifted Gompertz distribution is right-skewed for all values of . It is more flexible than the Gumbel distribution.
Shapes
The shifted Gompertz density function can take on different shapes depending on the values of the shape parameter :
- the probability density function has its mode at 0.
- the probability density function has its mode at
Related distributions
If varies according to a gamma distribution with shape parameter and scale parameter (mean = ), the distribution of is Gamma/Shifted Gompertz (G/SG). When is equal to one, the G/SG reduces to the Bass model.
See also
- Gumbel distribution
- Generalized extreme value distribution
- Mixture model
- Bass model
- Gompertz distribution
References
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A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
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In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
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