Gundala Viswanath
2013-May-09 01:29 UTC
[R] Choice of statistical test (in R) of two apparently different distributions
I have the following list of data each has 10 samples. The values indicate binding strength of a particular molecule. What I want so show is that 'x' is statistically different from 'y', 'z' and 'w'. Which it does if you look at X it has more values greater than zero (2.8,1.00,5.4, etc) than others. I tried t-test, but all of them shows insignificant difference with high P-value. What's the appropriate test for that? Below is my code: x <- c(2.852672123,0.076840264,1.009542943,0.430716968,5.4016,0.084281843,0.065654548,0.971907344,3.325405405,0.606504718) y <- c(0.122615039,0.844203734,0.002128992,0.628740077,0.87752229,0.888600425,0.728667099,0.000375047,0.911153571,0.553786408); z <- c(0.766445916,0.726801899,0.389718652,0.978733927,0.405585807,0.408554832,0.799010791,0.737676439,0.433279599,0.947906524) w <- c(0.000124984,1.486637663,0.979713013,0.917105894,0.660855127,0.338574774,0.211689885,0.434050179,0.955522972,0.014195184) t.test(x,y) t.test(x,z) --END-- G.V. [[alternative HTML version deleted]]
Pascal Oettli
2013-May-09 01:42 UTC
[R] Choice of statistical test (in R) of two apparently different distributions
Hello, 1) Why 'x' should be statistically different from others? 2) 'y' looks to be bimodal. The mean is not an appropriate measurement for this kind of distribution. Regards, Pascal On 05/09/2013 10:29 AM, Gundala Viswanath wrote:> I have the following list of data each has 10 samples. > The values indicate binding strength of a particular molecule. > > What I want so show is that 'x' is statistically different from > 'y', 'z' and 'w'. Which it does if you look at X it has > more values greater than zero (2.8,1.00,5.4, etc) than others. > > I tried t-test, but all of them shows insignificant difference > with high P-value. > > What's the appropriate test for that? > > Below is my code: > > x <- > c(2.852672123,0.076840264,1.009542943,0.430716968,5.4016,0.084281843,0.065654548,0.971907344,3.325405405,0.606504718) > y <- > c(0.122615039,0.844203734,0.002128992,0.628740077,0.87752229,0.888600425,0.728667099,0.000375047,0.911153571,0.553786408); > z <- > c(0.766445916,0.726801899,0.389718652,0.978733927,0.405585807,0.408554832,0.799010791,0.737676439,0.433279599,0.947906524) > w <- > c(0.000124984,1.486637663,0.979713013,0.917105894,0.660855127,0.338574774,0.211689885,0.434050179,0.955522972,0.014195184) > > t.test(x,y) > t.test(x,z) > > --END-- > > G.V. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >