[R] Which test should I use for comparing the change of two samples
Bert Gunter
gunter.berton at gene.com
Mon Oct 29 14:52:15 CET 2012
Is this homework? We don't do homework on this list.
You may also do better posting your question on
stats.stackexchange.com or other statistical list, as this appears to
be a statistics not an R question.
Cheers,
-- Bert
On Mon, Oct 29, 2012 at 6:12 AM, Tammy Ma <metal_licaling at live.com> wrote:
>
> Dear All,
>
> I have two samples as the following:
> conjps<-c(9.41,10.45,10.78,10.73,11.11,11.12,11.59,11.04,11.63)
>
> ms<-c(4.11,5.10,5.70,6.46,6.04,6.16, 6.24,6.32,7.33)
>
> I want to test the change of sample is same to the another one.
> conjps_ch<-c(1.04,0.33.....)
> ms<-c(0.99,0.60,0.76....)
>
>
> which test I should use, which conclusion can we drive based on the test?
>
> I used the following test:
>
>
> •Test Equality
> of Two Variances
>
> F
> test to compare two variances
>
>
>
> data:
> conjps and ms
>
> F = 0.5419, num df = 8,
> denom df = 8,
> p-value = 0.4045
>
> alternative hypothesis: true ratio of
> variances is not equal to 1
>
> 95 percent confidence interval:
>
> 0.1222368 2.4024170
>
> sample estimates:
>
> ratio of variances
>
>
> 0.5419076
>
>
>
> is it correct? which conclusion can I get based on this?
>
>
> Thanks for help.
>
> Kind regards,
> Tammy
>
> [[alternative HTML version deleted]]
>
>
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--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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