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diferencias estadísticamente significativas y al menos con tamaño de efecto medi

English translation: statistically significant differences and an effect size of medium or larger

13:13 Feb 22, 2017
Spanish to English translations [PRO]
Science - Mathematics & Statistics / Results of experiment
Spanish term or phrase: diferencias estadísticamente significativas y al menos con tamaño de efecto medi
Results of an experiment in which groups of rats were / were not deprived of food.

I am utterly confused by this sentence and cannot get beyond a literal translation (which doesn't make sense).

"Dichos índices de tamaño del efecto se evaluaron de acuerdo con los niveles propuestos por Cohen (1988). Se comprobó previamente el cumplimiento del supuesto de homocedasticidad con la prueba F de Levene para las variables transversales y se utilizó la F ajustada de Greenhouse-Geisser para las variables de medidas repetidas con más de un grado de libertad.

Se encontraron **diferencias estadísticamente significativas y al menos con tamaño de efecto medio** en sólo dos efectos principales (ver Tabla 2), de las variables entrenamiento y sesiones."

Any help greatly appreciated.
Lucy Breen
United Kingdom
Local time: 12:36
English translation:statistically significant differences and an effect size of medium or larger
Explanation:
Here a basically literal translation is correct. If you're not familiar with the terms it probably sounds strange, but statistical significance and effect size are two different ways to measure the effect of some treatment.
Statistical significance here is related to the likelihood that an observed difference in outcomes between two groups was due to random chance. If unlikely, the conclusion is that the observed difference must be due to the treatment being studied, and the difference is deemed statistically significant.
Effect size is a way to quantify how large or how important the effect of a treatment is. It can be measured in various ways, and Cohen proposed a scale (arbitrary but used quite often in some fields) where an effect size of 0.2 is considered "small," 0.5 is considered "medium," and 0.8 is considered "large."
Since they are measured differently, it's possible to have a statistically significant outcome whose effect size is small or, conversely, an outcome that is not statistically significant but whose effect size is large. The text is focusing on those that are both statistically significant and have large effect size as a way of highlighting the "most important" outcome variables.

Some references for effect sizes:

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Note added at 5 hrs (2017-02-22 19:06:12 GMT)
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No problem Lucy, glad to help!
Selected response from:

Samantha Cook
United States
Local time: 08:36
Grading comment
4 KudoZ points were awarded for this answer



Summary of answers provided
4 +1statistically significant differences and an effect size of medium or larger
Samantha Cook


Discussion entries: 3





  

Answers


23 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +1
statistically significant differences and an effect size of medium or larger


Explanation:
Here a basically literal translation is correct. If you're not familiar with the terms it probably sounds strange, but statistical significance and effect size are two different ways to measure the effect of some treatment.
Statistical significance here is related to the likelihood that an observed difference in outcomes between two groups was due to random chance. If unlikely, the conclusion is that the observed difference must be due to the treatment being studied, and the difference is deemed statistically significant.
Effect size is a way to quantify how large or how important the effect of a treatment is. It can be measured in various ways, and Cohen proposed a scale (arbitrary but used quite often in some fields) where an effect size of 0.2 is considered "small," 0.5 is considered "medium," and 0.8 is considered "large."
Since they are measured differently, it's possible to have a statistically significant outcome whose effect size is small or, conversely, an outcome that is not statistically significant but whose effect size is large. The text is focusing on those that are both statistically significant and have large effect size as a way of highlighting the "most important" outcome variables.

Some references for effect sizes:

--------------------------------------------------
Note added at 5 hrs (2017-02-22 19:06:12 GMT)
--------------------------------------------------

No problem Lucy, glad to help!


    https://en.wikipedia.org/wiki/Effect_size
    Reference: http://staff.bath.ac.uk/pssiw/stats2/page2/page14/page14.htm...
Samantha Cook
United States
Local time: 08:36
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 24
Notes to answerer
Asker: O the perils of translating outside one's campo! Thanks once again Samantha for a clear and precise explanation.

Asker: Many thanks


Peer comments on this answer (and responses from the answerer)
agree  philgoddard: Presumably you could say medium or larger effect size.
37 mins
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