[R] 2 Sample Confidence Interval - Formatting Data?

[Moshe Olshansky]

Hello Wayne,

Welch Test (as suggested by M.S.) can be a good
choice, but since your sample is very small you must
ask yourself what can you assume about the two samples
(i.e. do they come from more or less normal
distributions, etc.).

Regards,

Moshe.

--- Wayne Aldo Gavioli <wgavioli at fas.harvard.edu>
wrote:

> 
> 
> Hello all,
> 
> I have to run a 2 Sample Confidence Interval on some
> data; the command for such
> intervals is "confint(...)", but in the help
> documentation it says that you
> need a "fitted model object" in order to run this
> command.  What does that
> mean?
> 
> The data is very small, it's:
> 
> x=c(8,12,10,14,2,0,0)
> y=c(-6,0,1,2,-3,-4,2)
> 
> 
> and I want to be able to run a Confidence interval
> for the difference of two
> means (x-bar minus y-bar).  Do I have to fit these
> two pieces of data into some
> kind of object?
> 
> 
> A little confused,
> 
> 
> Wayne
> 
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