nivel de significación del 0,05%

English translation: significance level

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Spanish term or phrase:nivel de significación
English translation:significance level
Entered by: MJ Barber

13:26 Jan 11, 2004
Spanish to English translations [PRO]
Mathematics & Statistics / statistics
Spanish term or phrase: nivel de significación del 0,05%
Was reading about this in an earlier question, but I'm afraid I still don't understand it. So should I say a 95.95% confidence level? A 0.05% confidence level just doesn't sound very confident at all.



Utilizando el test de Fisher, con un nivel de significación del 0,05% y un poder del 80%, una muestra de 25 pacientes en cada grupo de tratamiento es suficiente para detectar diferencias de al menos el 30% en el porcentaje de pacientes en las que desaparece el melasma, asumiendo que la tasa de curación en el grupo activo es del 30% y en el grupo placebo del 0,1%.
MJ Barber
Spain
Local time: 15:21
0.05 significance level
Explanation:
Hi MJ,

It was my question, right? :-)

You should express the significance level as 0.05. Here's a good explanation:

Significance levels show you how likely a result is due to chance. The most common level, used to mean something is good enough to be believed, is .95. This means that the finding has a 95% chance of being true. However, this value is also used in a misleading way. No statistical package will show you "95%" or ".95" to indicate this level. Instead it will show you ".05," meaning that the finding has a five percent (.05) chance of not being true, which is the converse of a 95% chance of being true. To find the significance level, subtract the number shown from one. For example, a value of ".01" means that there is a 99% (1-.01=.99) chance of it being true. In this table, there is probably no difference in purchases of gasoline X by people in the city center and the suburbs, because the probability is .795 (i.e., there is only a 20.5% chance that the difference is true). In contrast the high significance level for type of vehicle (.001 or 99.9%) indicates there is almost certainly a true difference in purchases of Brand X by owners of different vehicles in the population from which the sample was drawn.

My question had to do with a 95.5% "nivel de significación" (just the opposite of what is usually seen, i.e., the 0.05) and the client eventually changed it to 95.5% confidence level (rather than significance).

Hope that helps.
Cindy
Selected response from:

tazdog (X)
Spain
Local time: 15:21
Grading comment
Yes, it was your question I was reading, and I found it really confusing! Thanks for straightening that out for me. MJ
4 KudoZ points were awarded for this answer



Summary of answers provided
4 +30.05% significance value
Ramon Somoza
5 +10.05 significance level
tazdog (X)
5 +1significance level of 5%
John Speese
5level of significance (OR significance level)
rhandler


  

Answers


14 mins   confidence: Answerer confidence 5/5
level of significance (OR significance level)


Explanation:
Check for its definition at the first reference, and an example at the second:

level of significance. The American Heritage® Dictionary of the ...
level of significance. The American Heritage® Dictionary of the English Language:
Fourth Edition. 2000. ... 2000. level of significance. NOUN: Inflected forms: pl. ...
www.bartleby.com/61/80/L0138000.html

Help for Level of Significance of a Test Laboratory
Help file for StatConcepts Level of Significance of a Test LaboratoryS-Plus version. Help for Level of Significance of a Test Laboratory. Menu: Labs. Introduction. ...
www2.msstate.edu/~harvill/schelp/size.html


--------------------------------------------------
Note added at 2004-01-11 13:43:13 (GMT)
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Level of significance = probability of a false rejection of the null hypothesis in a statistical test.

Watch out: 1 - 0.05 = 99.95

--------------------------------------------------
Note added at 2004-01-11 13:47:01 (GMT)
--------------------------------------------------

Here\'s another site of interest:

The p-value (level of significance)
... The p-value (level of significance). All statistical tests produce
a p-value and this is equal to the probability of obtaining the ...
hsc.uwe.ac.uk/dataanalysis/quant_iss_pval.htm

--------------------------------------------------
Note added at 2004-01-11 14:00:05 (GMT)
--------------------------------------------------

Typo: it should say 100-0.05 = 99.95

--------------------------------------------------
Note added at 2004-01-11 15:45:39 (GMT)
--------------------------------------------------

I assumed you didn\'t need help with the 0,05% portion of your question.


    Reference: http://www.bartleby.com/61/80/L0138000.html
    Reference: http://www2.msstate.edu/~harvill/schelp/size.html
rhandler
Local time: 10:21
Native speaker of: Portuguese
Login to enter a peer comment (or grade)

26 mins   confidence: Answerer confidence 5/5 peer agreement (net): +1
nivel de significación del 0,05%
0.05 significance level


Explanation:
Hi MJ,

It was my question, right? :-)

You should express the significance level as 0.05. Here's a good explanation:

Significance levels show you how likely a result is due to chance. The most common level, used to mean something is good enough to be believed, is .95. This means that the finding has a 95% chance of being true. However, this value is also used in a misleading way. No statistical package will show you "95%" or ".95" to indicate this level. Instead it will show you ".05," meaning that the finding has a five percent (.05) chance of not being true, which is the converse of a 95% chance of being true. To find the significance level, subtract the number shown from one. For example, a value of ".01" means that there is a 99% (1-.01=.99) chance of it being true. In this table, there is probably no difference in purchases of gasoline X by people in the city center and the suburbs, because the probability is .795 (i.e., there is only a 20.5% chance that the difference is true). In contrast the high significance level for type of vehicle (.001 or 99.9%) indicates there is almost certainly a true difference in purchases of Brand X by owners of different vehicles in the population from which the sample was drawn.

My question had to do with a 95.5% "nivel de significación" (just the opposite of what is usually seen, i.e., the 0.05) and the client eventually changed it to 95.5% confidence level (rather than significance).

Hope that helps.
Cindy



    Reference: http://www.surveysystem.com/signif.htm
tazdog (X)
Spain
Local time: 15:21
Native speaker of: English
PRO pts in category: 8
Grading comment
Yes, it was your question I was reading, and I found it really confusing! Thanks for straightening that out for me. MJ

Peer comments on this answer (and responses from the answerer)
agree  Ana Krämer
29 mins
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44 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +3
nivel de significación del 0,05%
0.05% significance value


Explanation:
Do not confuse "significance value" (used for comparison of results) with confidence. I suggest for your assistance the following on-line dictionaries/glossaries:
http://www.estadistico.com


More about Fisher's test:
http://home.clara.net/sisa/fishrhlp.htm
http://bmj.bmjjournals.com/collections/statsbk/9.shtml


    Reference: http://www.estadistico.com/dic.html?q=significaci%F3n&mod=11...
    Reference: http://www.fisterra.com/material/investiga/signi_estadi/sign...
Ramon Somoza
Spain
Local time: 15:21
Native speaker of: Native in SpanishSpanish, Native in EnglishEnglish

Peer comments on this answer (and responses from the answerer)
agree  Cecilia Della Croce
41 mins
  -> Muchas gracias, Cecilia

agree  Maria Lorenzo
3 hrs
  -> Muchas gracias, María

agree  Gordana Podvezanec
3 hrs
  -> Thank you, Gordana
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2 hrs   confidence: Answerer confidence 5/5 peer agreement (net): +1
significance level of 5%


Explanation:
"Using Fisher's test with a significance level of 5% and a power of 80%, a sample of 25 patients in each treatment group is sufficient to detect differences of at least 30% in the percentage of pacients in whom the melasma disappears, assuming that the rate of cure/recovery is 30% in the group receiving the treatment and 0.1% in the group receiving the placebo."
All this means is that the treatment has a 95% percent probability of causing the effect observed, and that 5% of the observations would be due to chance alone. I do this stuff in agricultural research with insecticides myself.

John Speese
United States
Local time: 09:21
Native speaker of: English

Peer comments on this answer (and responses from the answerer)
agree  Sp-EnTranslator: check this out>http://hsc.uwe.ac.uk/dataanalysis/quant_iss_pval.htm<
6 hrs
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