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I have corrected my alpha level using Šidák correction to take into account the experiment-wise error rate, as I am doing multiple correlation tests using the same data set.

My new alpha is 0.00056.

I tried using SPSS but the p threshold (alpha) seems to be either 0.01 or 0.05 and the p value of the correlation is given only in three decimal places.

For example, SPSS returns the p value of one of my correlations as 0.000 and indicated it is significant at 0.01. However, my p threhold is not 0.01 but 0.00056.

How do I determine if this correlation is significant? How do I work out the extact p value at 4 decimal points, which will then enable me to compare it with 0.00056. Is there an easy to use but reliable online calculator, or is this adjustment possible in SPSS?

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Double-click the output table. Select the cells containing p-values. Right-click...Cell Properties...and adjust the number of decimal places.

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    $\begingroup$ Also, if memory serves, when SPSS does post-hocs it reports the p-values /after/ the adjustment has already been performed. $\endgroup$ – russellpierce Sep 6 '11 at 1:14

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