## English translation: Heteroscedasticity

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
 Spanish term or phrase: heterocedasticidad English translation: Heteroscedasticity Entered by:

 07:28 Feb 14, 2007
Spanish to English translations [PRO]
Bus/Financial - Transport / Transportation / Shipping
 Spanish term or phrase: heterocedasticidad This term occurs in a scientific research paper on public transportation. This term does appear in the Proz glossary, but without any explanation as to what it means. CONTEXT : "Dentro de la teoría de la utilidad aleatoria existen varios modelos de elección discreta, que suponen una distribución de probabilidad conjunta para el término aleatorio. Otros consideran cierta correlación entre las variables definidas, incluso la existencia de ***heterocedasticidad*** (distinta varianza entre alternativas); "
 Stuart AllsopChile Local time: 07:30
 Heteroscedasticity Explanation:Heteroscedasticity From Wikipedia, the free encyclopedia Plot with random data showing heteroscedasticity.In statistics, a sequence or a vector of random variables is heteroscedastic if the random variables in the sequence or vector may have different variances. The complementary concept is called homoscedasticity. (Note: There seems to be no standard agreed-upon spelling for these words; they are sometimes spelled homo- or heteroskedastic or (incorrectly) -schedastic, depending on location and personal taste.) When using a variety of techniques in statistics, such as ordinary least squares (OLS), a number of assumptions are typically made. One of these is that the error term has a constant variance. This will be true if the observations of the error term are assumed to be drawn from identical distributions. Heteroscedasticity is a violation of this assumption.
Selected response from:

David Brown
Spain
Local time: 11:30
 Selected automatically based on peer agreement.4 KudoZ points were awarded for this answer

5 +3Heteroscedasticity
 David Brown

Discussion entries: 2

32 mins   confidence: peer agreement (net): +3
Heteroscedasticity

Explanation:
Heteroscedasticity

Plot with random data showing heteroscedasticity.In statistics, a sequence or a vector of random variables is heteroscedastic if the random variables in the sequence or vector may have different variances. The complementary concept is called homoscedasticity. (Note: There seems to be no standard agreed-upon spelling for these words; they are sometimes spelled homo- or heteroskedastic or (incorrectly) -schedastic, depending on location and personal taste.)

When using a variety of techniques in statistics, such as ordinary least squares (OLS), a number of assumptions are typically made. One of these is that the error term has a constant variance. This will be true if the observations of the error term are assumed to be drawn from identical distributions. Heteroscedasticity is a violation of this assumption.

 David BrownSpainLocal time: 11:30Native speaker of: EnglishPRO pts in category: 32
 Selected automatically based on peer agreement.

agree
 45 mins

agree  Noni Gilbert: Heterocedasticity is the spelling I know. P´s spelling comment looks likely, although indeed these v technical ex-Greek words sometimes have alternative spellings.
 2 hrs

agree  Patricia Rosas: according to Harper Collins Economics Dictionary, David's spelling is right (could it be a US/UK difference?)
 8 hrs

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