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Topic: Fat tails


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In the News (Wed 15 Feb 12)

  
  Kurtosis
It has fatter tails, which might lead us to believe that it has a higher standard deviation.
If the effect of the peakedness exactly offsets that of the fat tails, the two PDFs will have the same standard deviation.
Leptokurtosis is associated with PDFs that are simultaneously “peaked” and have “fat tails.” Platykurtosis is associated with PDFs that are simultaneously less peaked and have thinner tails.
www.riskglossary.com /link/kurtosis.htm   (411 words)

  
  Fat Tail Option Calculator
The Fat Tail Option Calculator is available as a stand-alone application or as an Add-in to MS Excel.
Fat tails can be modeled with so called Stable Distributions, also called Levy distributions and Levy-Pareto distributions.
This is usually close to zero, and is calculated by the Fat Tail Option Calculator based on the arbitrage model used to value the options.
www.economymodels.com /optcalc.asp   (943 words)

  
 leopard gecko caresheet   (Site not responding. Last check: 2007-10-30)
Fat tails are generally a very good sign of health, but babies don't notrmally have very fat tails since all the fat they take in is used for growing.
The tail should still have some bulge to it, any leo with a tail the same width all the way down should not be bought.
Tail dropping should not kill a gecko (assuming it doesn't get infected), but it will weaken the gecko and take away most of its fat reserves.
www.dreamgecko.com /caresheet.html   (2743 words)

  
 Leopard (& Fat Tail) Geckos   (Site not responding. Last check: 2007-10-30)
The baby fat tails look very similar but if you look at their tails, the fat tail's is slightly larger/rounder.
Fat tails are from Africa; hence many are called African Fat Tail Geckos, while Leopard Geckos are primarily from the Pakistani area.
Leopard and fat tails are fairly small compared to most reptiles, maxing out at about 8" or so, with fat tails being slightly smaller.
people.ku.edu /~peace03/reptiles_leopardgeckos.htm   (945 words)

  
 African Fat Tail Gecko Care Sheet
Tail: The original tail of a Fat-tail gecko is long, thick and banded.
A gecko tail must be treated carefully, as they can be released at will to throw off a predetor or dropped due to some other trama.
A gecko who is missing a tail must be kept warm and well fed, as it will have nowhere to store its fat until another is regrown.
www.paulfirlotte.com /fattail.html   (1085 words)

  
 african fat tail care sheet.   (Site not responding. Last check: 2007-10-30)
The Fat tail gecko (Hemitheconyx caudicinctus) are native to West Africa, from Nigeria west to Senegal.
fat tail hatchlings and juveniles are not as skittish as leopard geckos.
All the fat and water storage is inside the tail and when the tail is lost so is the geckos storage of fat and water.
www.reptilerascals.com /fattailscare.html   (2027 words)

  
 Awassi fat tails - a chance for premium exports : Journal of Agriculture, Western Australia 35(3): 99-105 , 1994   (Site not responding. Last check: 2007-10-30)
The program to import Awassi fat tail sheep was one of a number of Department of Agriculture initiatives in the early 1980s to improve opportunities for diversification in agriculture and enhance the potential for exports.
The typical Awassi is a large framed, fat tail sheep with a brown or, less commonly, fl head and neck.
Fat distribution is different as the Awassi cross lamb carries a much higher proportion of total body fat on the rump and in the tail.
agspsrv34.agric.wa.gov.au /agency/pubns/journalofag/v35/awassiFatTails.htm   (2494 words)

  
 Behavioral finance glossary: Fat tails, peter greenfinch
Fat tails are anomalies in Gaussian distributions, where extreme occurences are more frequent that the theory predicts.
But if, because of some biological accident, there are more people than the normal law predict in those extreme categories, this will show in the shape of fat tail(s) at one end or at both ends the curve.
However invisible fat tails are in those too short statistics, that risk of extreme prices, returns or volatilities is often higher than a normal distribution law would...entail.
perso.wanadoo.fr /pgreenfinch/bfglo/bfglo.fat_tails.htm   (449 words)

  
 gexfiles - fat tail care sheet
The fat-tail's coloration is dark brown and tan banding that extends all the way to the middle of the tail and then the banding is dark brown and white.
African fat tails can be kept and cared for just the same as a leopard gecko.
Fat tails require higher relative air humidity than leopard geckos and the bark plus misting the cage 2-3 times a week will help.
www.gexfiles.com /fattailcare.html   (1639 words)

  
 Journal of the Academy of Business and Economics: Fat—tails and VaR estimation using power EWMA models
An important feature of the normal distribution is that the tail decay as the square of an exponential and thus faster than an exponential toward zero, implying that the large positive or negative returns are rare event.
The tail index is a measure of the degree of tail fatness of underlying distributions and is estimated using the extreme value theory (EVT), which addresses tail distribution behavior characteristics.
The larger the average, the smaller the tail index and the greater the magnitude of the fat-tailedness.
www.findarticles.com /p/articles/mi_m0OGT/is_1_3/ai_n8690371   (1259 words)

  
 * Fat Tails - (Stock Market): Definition   (Site not responding. Last check: 2007-10-30)
Excess kurtosis means that distribution has fatter tails than a normal distribution.
Fat tails means there is a higher than normal probability of big positive and negative returns realizations...
This is often called "fat tails" because of the way this looks when you graph the probability function...
www.mimihu.com /stockmarket/fat_tails.html   (109 words)

  
 Gecko Breeding   (Site not responding. Last check: 2007-10-30)
Fat tails, like leopard geckos, are temperature sex dependent.
Crowding young fat tails can cause them to produce more melanin, making them darker, and smaller individuals may fail to thrive because of competition for food among their larger siblings.
Other than those provisions, baby fat tails can be housed with the same environmental conditions as used for the adults.
www.roqufort.com /gex/gecko.htm   (1202 words)

  
 Fat Tail Geckos   (Site not responding. Last check: 2007-10-30)
Fat Tail geckos are a great choice when considering a gecko for a pet.
As hatchlings, Fat Tail geckos are one of the most docile and calm lizards we've ever encountered.
Fat Tails don't come in quite the variety of colors that Leopard Geckos do, but they do range in color from chocolate brown to bright orange.
home.cogeco.ca /~hqreptiles/fattails.html   (189 words)

  
 A General Approach to Integrated Risk Management with Skewed, Fat-Tailed Risk - Federal Reserve Bank of New York
In this paper, we use the method of copulas to construct the joint risk distribution for a typical large, internationally active bank.
A complex relationship between volatility and fat tails exists in determining the total risk: whether they offset or reinforce each other will depend on the setting.
We then compare the copula-based method with several conventional approaches to computing risk, each of which may be thought of as an approximation.
www.ny.frb.org /research/staff_reports/sr185.html   (322 words)

  
 PetPlace.com - Choosing a Fat-Tailed Gecko   (Site not responding. Last check: 2007-10-30)
Its tail is an effective fat-storing organ and does get very heavy, but it is probable that the common name actually refers instead to the regenerated tails of some specimens.
The tails of fat-tailed geckos autotomize, or break off, quite easily, and although the broken portion of the tail regenerates quickly, it is often bulbous, rounded and truly fat.
When the gecko is active, its tail is often curled upwards, and may be wriggled or writhed from side to side.
www.petplace.com /Articles/artShow.asp?artID=2028   (976 words)

  
 FAT RIGHT TAILS (10/19/02)   (Site not responding. Last check: 2007-10-30)
Sorry.) The reason is that it has a much fatter right tail — that is, there are many more people with really high incomes than you would expect from a normal distribution.
Even a lognormal distribution doesn’t capture it; the right tail is a lot fatter than that.
century work of Vilfredo Pareto it has been known that the right or upper tail of the distribution is well described by a power law.
www.wws.princeton.edu /~pkrugman/fattails.html   (566 words)

  
 Pet Tails - For owners of mutt, mixed breed, rescued dogs and cats - Dogs & Puppies
Pet Tails is designed especially for owners of adopted dogs and cats.
The articles in Pet Tails have advice that's specifically tailored to the special problems of living with adopted or rescued cat or dog.
Pet Tails is also full of my personal experiences with solving the problems of my own adopted pets.
www.pet-tails.com   (504 words)

  
 Untitled Document   (Site not responding. Last check: 2007-10-30)
The fat is stored in the base of the tail, which nearly triples in volume!
The Fat-tail is the among the few dwarf lemurs (and primates) to hibernate during the dry season.
Body and head 16-26cm, tail about the same length, 177-600g depending on how fat its tail is. Soft, woolly fur.
www.szgdocent.org /resource/pp/p-lmfat.htm   (550 words)

  
 Emanuel Derman's Blog: Fat Tails vs Phase Transitions   (Site not responding. Last check: 2007-10-30)
Emanuel Derman's Blog: Fat Tails vs Phase Transitions
Saddam is part of a fat tail, too far out to understand and prevent by some imagined diagnosis alone.
Germany is an ensemble that collectively underwent a phase transition.
www.wilmott.com /blogs/eman/index.cfm/2007/1/15/HitlerGermany   (195 words)

  
 July/August 2003 Sheep! Magazine   (Site not responding. Last check: 2007-10-30)
Moreover, the fat tail, being unfamiliar to U.S. lamb packing companies, is apt to be discounted by conventional, already low-paying outlets, such as auctions and traveling buyers.
Another benefit of the fat tail is the fact that Damaras wag their tails when all is well.
The Damara sheep's fat tail has two other potential benefits: It doesn't need to be docked, and it reduces a lot of the butcher's fat-trimming labor.
www.sheepmagazine.com /issues/03_04_03.html   (3220 words)

  
 Fat Tail Haven
Indigenous to West Africa, the African Fat Tail is one of the most popular geckos in the exotic pet world.
They are characterized as having a docile personality with beautiful chocolate colored bands and a fat tail.
Some fat tails have a beautiful white stripe that runs down their back.
www.kingsnake.com /fat_tail_haven   (236 words)

  
 The Frog Forum : talk to the frog :: 2 gecko questions
Sorry, I don't know a thing about fat tails but here is a good care sheet for cresteds.
Ok, my geckos will dig once in a while, leos and fat tails are burrowers, so it's natural for them to dig.
Fat tasiles are nice geckos, kept pretty much the same as leos, ut with a slightly higher humidity.
talkto.thefrog.org /index.php?action=vthread&forum=9&topic=4679   (1184 words)

  
 Screaming Amelanistic Fat Tails - LeosAnonymous.com
There is only one word to describe these fat tails...
Never in my life have I seen any amelanistic fat tails that surpass these beauties.
Not only are these some of most magnificently colored fat tails I have ever seen, they also carry the striped genes!
www.leosanonymous.com /AmelFatTails.html   (143 words)

  
 Fat Cat Merry Tails Case of 3   (Site not responding. Last check: 2007-10-30)
Soft and chewy dog toy has a floppy tail and a squeaker inside.
Fat Cat Ring Toss Case of 6
Fat Cat Fetch Art Heads - Guy Head Only
retailpets.com /metadogto.html   (349 words)

  
 Forums - MonteCarlo 'Fat-Tails' and Chebyshev's Inequality
I once heard it mentioned if you analyze other sets of returns (2 day, monthly, etc..) the fat tails disappear.
Having experienced a 4,5 or 6 sigma event does not imply the distribution has fat tails.
While these may be due to some concentrated number of trades, the fat tails nonetheless still manifest themselves.
www.elitetrader.com /vb/showthread.php?threadid=75409&perpage=6&pagenumber=3   (612 words)

  
 Pro Geckos
I house my fat tails in 28 quart Rubbermaid containers.
As with leopard geckos fat tails don't necessarily need a cool down.
As with leopard gecko eggs fat tails eggs are also temperature sexed dependent.
www.progeckos.com /caresheets/fat-tail.htm   (796 words)

  
 geckos-leopard - Care Sheets Information about Leopard GEckos Lizards geckos-leopard ,characteristics and sexing, ...
Fat tails like it a bit hotter and more humid.
Branches and logs make good cage furniture for geckos and leos and fat tailds need humid hide boxes with moist vermiculite or mist paper towells.
The same with fat tails- but they tend to be shyer.
www.repticzone.com /caresheets/483.html   (496 words)

  
 On Bayesian modelling of fat tails and skewness...   (Site not responding. Last check: 2007-10-30)
On Bayesian modelling of fat tails and skewness...
In addition, the impact on the existence of posterior moments in a regression model with unknown scale under commonly used improper priors is quite limited.
The linear regression model with a skewed Student error term is the main focus of the paper: we first characterize existence of the posterior distribution and its moments, using standard improper priors and allowing for inference on skewness and tail parameters.
db.socionet.nw.ru /RuPEc/xml/dgr/paper-kubcen/dgrkubcen199658.xml   (229 words)

  
 Fat Tails
FAT TAILS by Bill Bonner "I should have stayed away from the stump." - Elizabeth Bonner The figure in the distance was no native Nicaraguan.
But long-term thinking is a luxury not always available to the highly leveraged; they may not survive that long." Lowenstein is describing what statisticians call a "fat tail." A bell curve ought to be perfect - as perfect as the Nobel Prize winners thought the market itself was.
A fat tail had been reached in credit markets - where all the traders seemed to want to get out of the very same positions at the very same time.
www.talkabouttaxes.com /group/misc.taxes/messages/208002.html   (1893 words)

  
 Journal of the American Statistical Association : On Bayesian modeling of fat tails and skewness. @ HighBeam Research   (Site not responding. Last check: 2007-10-30)
Start / J / Journal of the American Statistical Association / March 01, 1998 / On Bayesian modeling of fat tails and skewness.
In particular, we introduce a class of sampling models that can simultaneously account for both skewness and fat tails, and conduct Bayesian inference in the context of a regression model with unknown scale.
Quite surprisingly, the currently existing toolbox for handling the common phenomenon of skewed data with fat tails seems rather limited.
static.highbeam.com /j/journaloftheamericanstatisticalassociation/march011998/onbayesianmodelingoffattailsandskewness/index.html   (257 words)

  
 The Best Little Beginner Lizards - Reptiles and Amphibians
Known for their ridges and big expressive eyes, these little nocturnal Mac Trucks are easy to heat, easy to feed, and easy to love.
A vertical cage is a must, and an important point to remember is that these geckos will NOT (unlike most geckos) re-grow their tails.
In fact, most adults in the wild don’t have tails.
www.bellaonline.com /articles/art46165.asp   (518 words)

  
 EconPapers: On Rational Bubbles and Fat Tails   (Site not responding. Last check: 2007-10-30)
Using insights on the behavior of multiplicative stochastic processes, we demonstrate that the tails of the unconditional distribution emerging from such bubble processes follow power-laws (exhibit hyperbolic decline).
Although power-law tails are a pervasive feature of empirical data, these numerical predictions are in disagreement with the usual empirical estimates.
Keywords: rational bubbles; random difference equations; multiplicative processes; rational bubbles; random difference equations; multiplicative processes; fat tails.
econpapers.repec.org /paper/bonbonsfb/458.htm   (275 words)

  
 Turtle Forum -> Fat Tails? ( Skin by Sunlite )
I've always just referred to our YBS as a male, but by looking at that tail, if this applys to "him" I think I might be giving my turtle a personality conflict...
Longer, thicker tails are males, and short tails are females.
The tail is not visible at all unles I flip him-- er...
www.turtleforum.com /forum/upload/index.php?showtopic=7335   (279 words)

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