How do I exclude data from statistics (Kruskal-Wallis test)?

Hi everyone,

I have loaded a table into matlab using T = readtable(filename). The table contains two columns where data is grouped by five concentrations like this example:

data concentration

23 1

32 1

45 2

44 2

22 3

21 3

26 4

26 4

41 5

44 5

Lets say I only want to test the data of groups 3 - 5. How do I exclude data (1 and 2) from the statistical test?

I want to carry out a Kruskal-Wallis test for this.

p = kruskalwallis(x,group)

How do i exclude data from a Kruskal-Wallis test?

Any help would be highly appreciated!

[Tommy]

You could get a subset of your table with

subset = T(any(T.concentration==[3 4 5],2),:)

so that subset only contains the data in groups 3 through 5.

Then the test might be

p = kruskalwallis(subset.data, subset.concentration)

but not 100% sure on that.