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fisher's exact
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2022-08-26
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FISHER'S EXACT TEST
When at least one cell has an
EXPECTED value less than five, Chi-
square is not applicable.
Fisher's exact test applies in such
cases. Because of the overflow limi-
tation when calculating factorials,
our program will not calculate
Fisher's exact test when the sum of
all four cells in the table exceeds
33.
Seventeen persons had been bitten in
the head or neck by the same rabid
wolf in Iran (Bull. WORLD HEALTH
ORGAN, 1955).
The standard Pasteur vaccine
treatment was given. In addition, 12
persons also received one or more
doses of antirabies gamma globulin.
The results are summarized as
follows:
I ALIVE I DEAD I
I I I
------------------------
I I I
GAM GLOB I 11 I 1 I 12
I I I
------------------------
I I I
PASTEUR I 2 I 3 I 5
I I I
------------------------
I I I
I 13 I 4 I 17
I I I
Since at least one expected value is
less than 5, Chi-Square is not valid.
Fisher's exact test is the test to
use.
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