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Statistics

Statistics deals with collecting, organizing, and interpreting numerical data. An important aspect of statistics is the analysis of population characteristics inferred from sampling.

36,756 Questions

Is it true In portfolio analysis you often use historical returns and standard deviations despite the fact that you are interested in future data?

This is true because the main concept of investment, especially the quantitative branch of investment, is to predict future returns based upon historical data.

What does dhoom svalka mean?

It would be helpful if you would tell us, in your question, the language of origin of the phrase you are asking about.

If you toss a penny how do you think the coin will land heads or tails explain?

there is even chance of having heads or tails since there is only 1 head and 1 tail on a penny.

Are stochastic methods classified under empirical models?

It really depends on what exactly you are referring to when you use the term "stochastic method". Stochastic implies randomness. A stochastic method could involve a random search for the correct interaction, a random search for a set of possible outcomes, or even guided guessing for a nearly exact or likely solution, just to list a few.

The model used in a stochastic method could be first principles, or empirical. In a first principles model the interactions are governed by equations which have been determined by the most basic physics. Any approximations are justified and accounted for. In an empirical model, the interaction is either approximated, guessed at, or completely ignored with a simple input to output mapping. The approximations are unknown, and the errors must be accounted for by comparing the model to a real event, and then crossing ones fingers in the hopes that the errors hold true for all similar events.

For examples:

* Most weather models are a mix of first principles, empirical and stochastic methods. They use first principles to govern air and heat flow, but use empirical approximations to account for the surface of the Earth and the effects of rain fall. They are stochastic in that they use slightly randomized sets of data to reflect errors in the data gathering, and in the model itself.

* Climate models are empirical and stochastic. The basic interactions have been either guessed at or ignored in favor of a simple input to output mapping. The "most likely" outcome is then guessed at by feeding the model a range of inputs. * Calculation of electron exchange and correlation potentials are first principles and stochastic. The interactions of the electrons are dictated strictly by quantum mechanics and electrostatics, but the ground states of many random configurations need to be investigated.

What is the largest dam in regards to water retention?

(Public knowledge) World—Structures and Buildings World's Largest Dams Dam Location cu m cu yds Year completed Three Gorges China 39,300,000 51,402,459 UC08 Syncrude Tailings Canada 540,000 706,320 UC Chapetón Argentina 296,200 387,410 UC Pati Argentina 238,180 274,026 UC New Cornelia Tailings United States 209,500 274,026 1973 Tarbela Pakistan 121,720 159,210 1976 Kambaratinsk Kyrgyzstan 112,200 146,758 UC Fort Peck Montana 96,049 125,628 1940 Lower Usuma Nigeria 93,000 121,644 1990 Cipasang Indonesia 90,000 117,720 UC Atatürk Turkey 84,500 110,522 1990 Yacyretá-Apipe Paraguay/Argentina 81,000 105,944 1998 Guri (Raúl Leoni) Venezuela 78,000 102,014 1986 Rogun Tajikistan 75,500 98,750 1985 Oahe South Dakota 70,339 92,000 1963 Mangla Pakistan 65,651 85,872 1967 Gardiner Canada 65,440 85,592 1968 Afsluitdijk Netherlands 63,400 82,927 1932 Oroville California 59,639 78,008 1968 San Luis California 59,405 77,700 1967 Nurek Tajikistan 58,000 75,861 1980 Garrison North Dakota 50,843 66,500 1956 Cochiti New Mexico 48,052 62,850 1975 Tabka (Thawra) Syria 46,000 60,168 1976 Bennett W.A.C. Canada 43,733 57,201 1967 Tucuruíi Brazil 43,000 56,242 1984 Boruca Costa Rica 43,000 56,242 UC High Aswan (Sadd-el-Aali) Egypt 43,000 56,242 1970 San Roque Philippines 43,000 56,242 UC Kiev Ukraine 42,841 56,034 1964 Dantiwada Left Embankment India 41,040 53,680 1965 Saratov Russia 40,400 52,843 1967 Mission Tailings 2 Arizona 40,088 52,435 1973 Fort Randall South Dakota 38,227 50,000 1953 Kanev Ukraine 37,860 49,520 1976 Mosul Iraq 36,000 47,086 1982 Kakhovka Ukraine 35,640 46,617 1955 Itumbiara Brazil 35,600 46,563 1980 Lauwerszee Netherlands 35,575 46,532 1969 Beas India 35,418 46,325 1974 Oosterschelde Netherlands 35,000 45,778 1986

What is a familiar and convenient way of keeping score of a set of obervations when constructing a frequency distribution table?

Tally


You can extend the idea of tally further to what Statisticians refer to as a Stem & Leaf Plot, which is a simple type of histogram. With a Stem & Leaf plot your tallies are placed in 'bins' according to their value, allowing you to observe the distribution of your data.

Let's say you have a data set: 0, 7, 10, 13, 18, 19, 21, 29, 55, 57, 59, 59, 60

The Stem & Leaf Plot would look like this:

0|07
1|0389
2|19
3|
4|
5|5799
6|0

i.e. '0' becomes '00' and '7' becomes '07' for the purposes of this Stem & Leaf Plot which needs two digits to illustrate its shape in this way.

What does 'erden' mean?

erden means to ground or to earth. It can also mean to bring so. back down to earth (who has his/her head in the clouds).

auf Erden means on earth.

What does mean Isolability?

http://dictionary.reference.com/browse/isolability

Capable of being isolated.

What does polariod mean?

1. A trademark used for a specially treated, transparent plastic capable of polarizing light passing through it, used in glare-reducing optical devices.2. A trademark used for a camera and film that produce instant photographs.