R help - Jul 2008 - Stratified random sample

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On 17/07/2008, at 11:45 AM, lamack lamack wrote:
>
> Dear all, I have two vector:
>  strata response1   11   21   32   12   22   3.  ..  ..  .10  110   
> 210  3.  ..  ..  .100  1100  2100  3
> I need to get a stratified random sample of size = 100, such that:
> if I select response = 1 in strata 1 then I need sample 2 or 3 in  
> strata 2
>
> if I select response = 2 in strata 2 then I need to sample 1 or 3  
> in strata 3
> if I select response = 3 in strata 2 then I need to sample 1 or 2  
> in strata 3
> and so on. Please, how can I do this?
You really should do your own homework.

	cheers,

		Rolf Turner

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create a vector containing 1,2,3

sample one value

remove the sampled value from the initial vector

sample again

now select the observations belonging to the strata indexed by the two
sampled values

-> not difficult. Most certainly, other approaches work too, maybe even
better.

Rolf, is he taking a course of yours? :)

Best
Daniel 


lamack lamack wrote:
> 
> 
> Dear all, I have two vector:
>  strata response1   11   21   32   12   22   3.  ..  ..  .10  110  210  3. 
> ..  ..  .100  1100  2100  3 
> I need to get a stratified random sample of size = 100, such that:
> if I select response = 1 in strata 1 then I need sample 2 or 3 in strata 2
>  
> if I select response = 2 in strata 2 then I need to sample 1 or 3 in
> strata 3
> if I select response = 3 in strata 2 then I need to sample 1 or 2 in
> strata 3
> and so on. Please, how can I do this?
>       Best regards
> _________________________________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
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