R help - Nov 2000 - Confidence interval

I have this question I hope you can answer. First, lets see this simple example,
using the Student's t-test:

> test<-t.test(miTest.data, mu=0.5, conf.level=0.90 )
> test
         One Sample t-test 

data:  miTest.data 
t = 0.5222, df = 9, p-value = 0.6141 
alternative hypothesis: true mean is not equal to 5 
90 percent confidence interval:
 3.744928 7.255072 
sample estimates:
mean of x 
      5.5 

The question is: what kind of expression should I use to get the confidence
interval? That is, what expression should <exp> be, so
> confInterval <- <exp>
> cinfInterval
[1] 3.744928 7.255072
> 
Thanks in advance,

Guillermo.

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gbrajovic at entelchile.net writes:
> The question is: what kind of expression should I use to get the confidence
interval? That is, what expression should <exp> be, so
> 
> > confInterval <- <exp>
> > cinfInterval
> [1] 3.744928 7.255072
> > 
> 
test$conf.int

For a more generalizable solution consider the output of

names(test)
str(test)
unclass(test)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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Good evening!

On 22-Nov-00 gbrajovic at entelchile.net wrote:
> 
> I have this question I hope you can answer. First, lets see this simple
> example, using the Student's t-test:
> 
> 
>> test<-t.test(miTest.data, mu=0.5, conf.level=0.90 )
>> test
> 
>          One Sample t-test 
> 
> data:  miTest.data 
> t = 0.5222, df = 9, p-value = 0.6141 
> alternative hypothesis: true mean is not equal to 5 
> 90 percent confidence interval:
>  3.744928 7.255072 
> sample estimates:
> mean of x 
>       5.5 
> 
> The question is: what kind of expression should I use to get the confidence
> interval? That is, what expression should <exp> be, so
> 
>> confInterval <- <exp>
>> cinfInterval
> [1] 3.744928 7.255072
Try

confInterval <- t.test(miTest.data, mu=0.5, conf.level=0.90)$conf.int[1:2]

Details are found in help(t.test)

Happy R´ing!
Detlef

----
Detlef Steuer ** Universität der Bw ** 22043 Hamburg
steuer at unibw-hamburg.de

Th. Adorno: "Die Neigung zum Okkultismus ist ein Symptom der Rückbildung
des
Bewusstseins."


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gbrajovic at entelchile.net wrote:
> 
> I have this question I hope you can answer. First, lets see this simple
example, using the Student's t-test:
> 
> > test<-t.test(miTest.data, mu=0.5, conf.level=0.90 )
> > test
> 
>          One Sample t-test
> 
> data:  miTest.data
> t = 0.5222, df = 9, p-value = 0.6141
> alternative hypothesis: true mean is not equal to 5
> 90 percent confidence interval:
>  3.744928 7.255072
> sample estimates:
> mean of x
>       5.5
> 
> The question is: what kind of expression should I use to get the confidence
interval? That is, what expression should <exp> be, so
> 
> > confInterval <- <exp>
> > cinfInterval
> [1] 3.744928 7.255072
Example:

 my.t.test <- t.test(rnorm(100))
 str(my.t.test)
# So you see, that <exp> can be replaced with:
 my.t.test$conf.int[1:2]

Uwe Ligges
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