[R] Odp: Using t tests

Petr PIKAL petr.pikal at precheza.cz
Fri Jul 8 11:39:56 CEST 2011


> [R] Using t tests
> Dear Sir,
> I am doing some work on a population of patients. About half of them are 
> admitted into hospital with albumin levels less than 33. The other half 
> albumin levels greater than 33, so I stratify them into 2 groups, x and 
> respectively.
> I suspect that the average length of stay in hospital for the group of 
> patients (x) with albumin levels less than 33 is greater than those with 

> albumin levels greater than 33 (y).
> What command function do I use (assuming that I will be using the chi 
> square test) to show that the length of stay in hospital of those in 
group x is 
> statistically significantly different from those in group y?

I am not an expert statistician but you suggested t test which seems to me 

About how to use it see



> I look forward to your thoughts.
> Ivo Gwanmesia
>    [[alternative HTML version deleted]]
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