fisher.test 中的错误：fexact3 中的错误，it[i=6]=0：否定键 (kyy=91)

Question

I have this table abd I want to analyse it statistically.

table(sci$category, sci$true_group)


                 mono sim_rus_nen suc_balanced suc_nen_rus suc_rus_nen
  generalization    9           3            9           4           3
  description      35          16           15          13          17
  scheme            2           1            1           1           2
  syncretism        5           3            7          16           2
  tautology         2           2            2           3           3
  substitution      1           0            0           0           0
  indefinite        7           5            5           6           9
  no_answer        30          17           18          13          19

So I decided to apply Fisher's exact test. But I have this error (although it's OK with chiq.square)

fisher.test(table(sci$category, sci$true_group))

Error in fisher.test(my_tab) : Bug in fexact3, it[i=6]=0: negative key -1099365618 (kyy=91)

How can I fix this?

Answer 1

For larger contingency table/ counts, it gets resource intensive, to count all the worst cases to arrive at the p-value (seems to be that error).

So its convenient to simulate the p-values for tables larger than (2x2):

df <- table(sci$category, sci$true_group)

fisher.test(df, simulate.p.value = TRUE, B = 1e6)

Fisher's Exact Test for Count Data with simulated p-value (based on 1e+06 replicates)
data:  df
p-value = 0.1054
alternative hypothesis: two.sided

PS: Choosing between Fishers exact test vs Chisq-test is a whole another discussion. I would refer you to this cross validated post for clarity: Alternatives to chisq-test

Answer 2

I have the problem that I get an error message if I try to use the fisher.test

fisher.test(carprices$insurance_symboling, carprices$weight)

Error in fisher.test(carprices$insurance_symboling, carprices$weight) : FEXACT error 6 (f5xact). LDKEY=427 is too small for this problem: kval=317844542. Try increasing the size of the workspace.

What can I do?