Kruskal-Wallis test with very small p-values

The results from the Kruskall-Wallis test I applied in my data retrives some p-values like e-218, can anyone tell me if this can be related with some kind of issue? Or it is an acceptable value? I used the command:

 p = kruskalwallis(x,group) 

Thank you.

Answer 1

[Jeff Miller]

p values can be anywhere between 0 and 1, depending on your data. a tiny p value like that is telling you that you would very rarely obtain such large group differences by chance if there were no real differences. if you have done everything correctly, you should be able to see that the groups are obviously different just by eye--by looking at the scores from the different groups.