chipmaney schreef:
I have run a kruskal.test() using the by() function, which returns a list of
results like the following (subset of results):

Herb.df$ID: 4-2
       Kruskal-Wallis chi-squared = 18.93, df = 7, p-value = 0.00841
--------------------------------------------------------------------
Herb.df$ID: 44-1
        Kruskal-Wallis chi-squared = 4.43, df = 6, p-value = 0.6187


So then, how do extract a vector of p-values (i.e., result$p.value) for
every element in the list?



If result$p.value normally returns the p value from a kruskal.test result you can probably do something like:

vector_pvalues = sapply(result_from_by_list, function(x) x$p.value)

cheers,
Paul

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