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