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Hi, so I run a Fisher's exact test, and it shows me that the table probability is <0.0001, but doesn't show any other p-values like the one-sided or two-sided p-values
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Your answer is in the WARNING.
WARNING: There is not enough memory available to compute Fisher's exact test.
The suggestion would be to either use the asymptotic test or get a Monte-Carlo estimate of the exact p-value by adding the MC option to the EXACT statement.
PROC FREQ DATA=first;
TABLES cut*Oxarma;
EXACT FISHER/MC:
RUN:
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PROC FORMAT; value $Oxarma '1' = 'None' '2' = 'Trace' '3' = 'Some' '4' = 'Unacceptable'; value $Oxarmab '1' = 'None/Trace' '2' = 'None/Trace' '3' = 'Some' '4' = 'Unacceptable'; value $Oxarmac '1' = 'Acceptable' '2' = 'Acceptable' '3' = 'Acceptable' '4' = 'Unacceptable'; Run; PROC FREQ data=first; tables day*Oxarma / FISHER; format Oxarma $Oxarma.; Run; Quit;
Log:
PROC FREQ data=first;
946 tables cut*Oxarma / FISHER;
947 format Oxarma $Oxarma.;
948 Run;NOTE: Writing HTML Body file: sashtml.htm
WARNING: Computing exact p-values for this problem may require much time and memory. Press the
system interrupt key to terminate exact computations.
WARNING: There is not enough memory available to compute Fisher's exact test.
NOTE: There were 913 observations read from the data set WORK.FIRST.
NOTE: PROCEDURE FREQ used (Total process time):
real time 5:32.70
cpu time 5:28.39
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Your answer is in the WARNING.
WARNING: There is not enough memory available to compute Fisher's exact test.
The suggestion would be to either use the asymptotic test or get a Monte-Carlo estimate of the exact p-value by adding the MC option to the EXACT statement.
PROC FREQ DATA=first;
TABLES cut*Oxarma;
EXACT FISHER/MC:
RUN:
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Pr <= P 0.9481
99% Lower Conf Limit 0.9424
99% Upper Conf Limit 0.9538
Number of Samples 10000
Initial Seed 358024000
This is the data I get. How reliable is this Monte Carlo estimate? This suggests that the two variables are independent and that the treatment does not affect the outcome, does it not?
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The MC estimate is very reliable. Interpretation in terms of treatment and outcome is left to the researcher. Only he/she knows the details of the data. For instance, why so many data are missing...
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