[R] how to use apply on a two variable t-test

[Simon Fear]

For your main question, see ?mapply.

For the "what happened to the output in my for loop"
FAQ: you need to put in an explicit print() around
the t.test call. At the command prompt, expressions are
evaluated and printed; elsewhere they are only
evaluated.

HTH and Happy New Year to all,
Simon

> -----Original Message-----
> From: Jason Dunsmore [mailto:jbdunsmo at utmb.edu]
> Sent: 31 December 2003 15:13
> To: r-help at stat.math.ethz.ch
> Subject: [R] how to use apply on a two variable t-test
> 
> 
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> ________________________________________________________________ 
>  
> does anyone know how to use the apply function on a 
> two-variable t-test? 
> i've tried everything.
> 
> apply(data[1:4],1,t.test) # works, but only a one-variable test
> apply((data[1:4],data[5:9]),1,t.test) # returns a syntax error
> 
> i've also tried using the for loop:
> 
> for (i in 1:1000) t.test(data[i,1:4],data[i,5:9])
> 
> doesn't print anything!  it processes for awhile, so i know 
> it's doing 
> the calculations.
> 
> t.test(data[1,1:4],data[1,5:9])
> 
> works fine! prints to the screen as i'd expect.
> 
> i have checked and double checked that sink() is empty.  please also 
> send your reply to jbdunsmo at utmb.edu.  i receive the digest 
> version of 
> the mailing list.
> 
> thanks for any help,
> jason
> 
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Simon Fear 
Senior Statistician 
Syne qua non Ltd 
Tel: +44 (0) 1379 644449 
Fax: +44 (0) 1379 644445 
email: Simon.Fear at synequanon.com 
web: http://www.synequanon.com 
  
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