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regression to the mean

Serbian translation: regresija po medijani

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:regression to the mean
Serbian translation:regresija po medijani
Entered by: Goran & Snežana Erdei

14:52 May 23, 2008
English to Serbian translations [PRO]
Medical - Medical (general)
English term or phrase: regression to the mean
What causes the placebo response? One of the reasons is something called the regression to the mean.

One of the things that may make them a responder is the issue of regression to the mean. So what do I mean by that? What I mean is that by its nature epilepsy is a variable disease and subjects can have exacerbations and improvements irrespective of wheather they go on a new treatment of not. Even if you just follow them over the course of time, they're going to have some times when they're better and some times when they're worse.
Goran & Snežana Erdei
Serbia
Local time: 13:06
regresija po medijani
Explanation:
A regression threat, also known as a "regression artifact" or "regression to the mean" is a statistical phenomenon that occurs whenever you have a nonrandom sample from a population and two measures that are imperfectly correlated. The figure shows the regression to the mean phenomenon. The top part of the figure shows the pretest distribution for a population. Pretest scores are "normally" distributed, the frequency distribution looks like a "bell-shaped" curve. Assume that the sample for your study was selected exclusively from the low pretest scorers. You can see on the top part of the figure where their pretest mean is -- clearly, it is considerably below the population average. What would we predict the posttest to look like? First, let's assume that your program or treatment doesn't work at all (the "null" case). Our naive assumption would be that our sample would score just as badly on the posttest as they did on the pretest. But they don't! The bottom of the figure shows where the sample's posttest mean would have been without regression and where it actually is. In actuality, the sample's posttest mean wound up closer to the posttest population mean than their pretest mean was to the pretest population mean. In other words, the sample's mean appears to regress toward the mean of the population from pretest to posttest.


Lepo pretpostavih da je reč o kliničkoj studiji u vezi sa epilepsijom, te statističkoj analizi rezultata iste. Dakle, npr. u tzv. regresionim analizama rezultata, kakva je Cox-ova, često se koristi termin "regression to the mean" ili "regression artifact/regression threat". Reč je o regresiji po medijani (srednjoj vrednosti nekog broja).


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Note added at 29 mins (2008-05-23 15:22:00 GMT)
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dr Milan Merkle: Medijana: klasicni i noviji rezultati.

Medijana kao mera srednje vrednosti, u poredjenju sa matematickim ocekivanjem ima prednost u robusnosti i bezuslovnoj egzistenciji, a nedostatak u nelinearnosti i nejedinstvenosti. U klasicnim tekstovima iz teorije Verovatnoce malo paznje je posveceno medijani, ali s druge strane koncepti kao sto su nepristrasnost po medijani, regresija po medijani, uslovna medijana i sl. nalaze veliku primenu u alternativnim resenjima tradicionalnih problema matematicke statistike. Izlaganje ce biti posveceno nekim rezultatima koji se odnose na osobine medijane, kao i nekim primenama teorije bazirane na medijani umesto na matematickom ocekivanju.

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Note added at 1 day22 hrs (2008-05-25 13:21:14 GMT) Post-grading
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Najlepše zahvaljujem! :) Bitno je da je bilo od pomoći. :)
Selected response from:

RINA LINGUISTIC SERVICES, Katarina Radojevic- Mitrovic
Serbia
Local time: 13:06
Grading comment
Hvala vam, delovali ste vrlo ubedljivo.
4 KudoZ points were awarded for this answer



Summary of answers provided
5 +3regresija po medijani
RINA LINGUISTIC SERVICES, Katarina Radojevic- Mitrovic
5 -1regresija prema srednjoj vrijednosti
Dinap


  

Answers


2 hrs   confidence: Answerer confidence 5/5 peer agreement (net): -1
regresija prema srednjoj vrijednosti


Explanation:
Mean je srednja vrijednost, aritmetička sredina ali medijana je nešto sasvim drugo

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Note added at 2 hrs (2008-05-23 17:26:51 GMT)
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Oprostite: prema srednjoj vrednosti

http://www.foi.hr/CMS_library/studiji/dodiplomski/IS/kolegij...

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Note added at 2 hrs (2008-05-23 17:30:33 GMT)
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http://www.medfak.ni.ac.yu/asn/2004/2004-decembar/3-rad.pdf

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Note added at 15 hrs (2008-05-24 06:31:48 GMT)
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http://sr.wikipedia.org/sr-el/Медијана_(статистика)-ovaj link objašnjava razlika između medijane i aritmetičke sredine, link je na srpskom, ali na svim jezicima iva se dva pojma itekako razlikuju

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Note added at 15 hrs (2008-05-24 06:33:45 GMT)
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Vidjeti također i:

http://www.proz.com/kudoz/english_to_croatian/mathematics_st...

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Note added at 15 hrs (2008-05-24 06:37:36 GMT)
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Citat:

Galtonov: «regresija prema srednjim vrijednostima»

Riječ je zapravo o istom fenomenu kao kod «miješanog nasljeđivanja» - odnosno, da potomci obično imaju srednji fenotip – što je Galton nazvao: «regression towards mediocrity» te je potom donio drugačiji zaključak o evoluciji od Darwina. Naime, on je također uvidio da bi ovaj trend erodirao bilo kakav selektivni progres (odnosno evoluciju) te je zaključio da evolucija mora biti utemeljena na mutacijama velikih učinaka («sports») prije nego na selekciji koja bi djelovala na kontinuiranu varijabilnost.

Međutim, razlika prema Darwinu je što je Galton ovaj fenomen prikazao regresijskom linijom, te naglasio zapažanje da najviši očevi rijetko imaju i najviše sinove, a najniži najniže. Danas je Galtonov fenomen «regression towards mediocrity» preimenovan u: «regression towards mean» između ostalog i iz razloga jer se uvidjelo da se fenomen ne odnosi samo na evoluciju, odnosno na srednje vrijednosti djece u odnosu na roditelje već na sve identične mjere s koreliranim mjerenjima.


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Note added at 20 hrs (2008-05-24 11:09:11 GMT)
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Na ovom linku objašnjena je veza regresije i srednje vrijednosti:
http://www.zemris.fer.hr/predmeti/stu/Regresija.doc


    Reference: http://www.ffzg.hr/anthropos/files/kvangen/KG_PREDAVANJA1-5....
Dinap
Croatia
Local time: 13:06
Specializes in field
Native speaker of: Native in CroatianCroatian
PRO pts in category: 124

Peer comments on this answer (and responses from the answerer)
agree  Natasa Djurovic
5 mins
  -> Hvala
disagree  RINA LINGUISTIC SERVICES, Katarina Radojevic- Mitrovic: Taj termin, kao standard, ne postoji! A ako ga ko koristi po slobodnom izboru, ne bih komentarisala. Vidite komentar i gore uz moj odgovor.
5 hrs
  -> http://sr.wikipedia.org/sr-el/Медијана_(статистика), pogledajte link medijana je medijan a to nije mean
disagree  Mira Stepanovic: ovde se ne radi o srednjoj vrednosti u smislu aritmetičke sredine;molim pogledajte vaš poslednji komentar koji ste naveli za 'mean' http://www.proz.com/kudoz/english_to_croatian/mathematics_st... i objašnjenje kolege Medića
20 hrs
Login to enter a peer comment (or grade)

23 mins   confidence: Answerer confidence 5/5 peer agreement (net): +3
regresija po medijani


Explanation:
A regression threat, also known as a "regression artifact" or "regression to the mean" is a statistical phenomenon that occurs whenever you have a nonrandom sample from a population and two measures that are imperfectly correlated. The figure shows the regression to the mean phenomenon. The top part of the figure shows the pretest distribution for a population. Pretest scores are "normally" distributed, the frequency distribution looks like a "bell-shaped" curve. Assume that the sample for your study was selected exclusively from the low pretest scorers. You can see on the top part of the figure where their pretest mean is -- clearly, it is considerably below the population average. What would we predict the posttest to look like? First, let's assume that your program or treatment doesn't work at all (the "null" case). Our naive assumption would be that our sample would score just as badly on the posttest as they did on the pretest. But they don't! The bottom of the figure shows where the sample's posttest mean would have been without regression and where it actually is. In actuality, the sample's posttest mean wound up closer to the posttest population mean than their pretest mean was to the pretest population mean. In other words, the sample's mean appears to regress toward the mean of the population from pretest to posttest.


Lepo pretpostavih da je reč o kliničkoj studiji u vezi sa epilepsijom, te statističkoj analizi rezultata iste. Dakle, npr. u tzv. regresionim analizama rezultata, kakva je Cox-ova, često se koristi termin "regression to the mean" ili "regression artifact/regression threat". Reč je o regresiji po medijani (srednjoj vrednosti nekog broja).


--------------------------------------------------
Note added at 29 mins (2008-05-23 15:22:00 GMT)
--------------------------------------------------

dr Milan Merkle: Medijana: klasicni i noviji rezultati.

Medijana kao mera srednje vrednosti, u poredjenju sa matematickim ocekivanjem ima prednost u robusnosti i bezuslovnoj egzistenciji, a nedostatak u nelinearnosti i nejedinstvenosti. U klasicnim tekstovima iz teorije Verovatnoce malo paznje je posveceno medijani, ali s druge strane koncepti kao sto su nepristrasnost po medijani, regresija po medijani, uslovna medijana i sl. nalaze veliku primenu u alternativnim resenjima tradicionalnih problema matematicke statistike. Izlaganje ce biti posveceno nekim rezultatima koji se odnose na osobine medijane, kao i nekim primenama teorije bazirane na medijani umesto na matematickom ocekivanju.

--------------------------------------------------
Note added at 1 day22 hrs (2008-05-25 13:21:14 GMT) Post-grading
--------------------------------------------------

Najlepše zahvaljujem! :) Bitno je da je bilo od pomoći. :)


    Reference: http://www.southalabama.edu/coe/bset/johnson/studyq/sq8.htm
RINA LINGUISTIC SERVICES, Katarina Radojevic- Mitrovic
Serbia
Local time: 13:06
Specializes in field
Native speaker of: Native in SerbianSerbian, Native in Serbo-CroatSerbo-Croat
PRO pts in category: 28
Grading comment
Hvala vam, delovali ste vrlo ubedljivo.

Peer comments on this answer (and responses from the answerer)
agree  Mira Stepanovic: da, ovo je uobičajen termin: http://www.mi.sanu.ac.yu/seminars/programs/seminar13.node200...
22 hrs
  -> Hvala najlepše, koleginice! :)
agree  Larisa Djuvelek-Ruggiero (X)
2 days 10 hrs
  -> Hvala Vam! :)
agree  Dinap: Iskrene isprike zbog površmog i brzopletog pristupa pitanju i ustrrajavanju na netočnom rješenju
15 days
  -> Nema problema. Vazno je da se pomognemo medjusobno. :) Hvala Vam!
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