If plot.type == "main", The estimated q-values versus the p-values are
plotted together with the histogram of the p-values.
If plot.type == "multiple" (default value), several graphics are displayed.
legend
Logical value for displaying the legend on the plot (when
plot.type == "main").
Details
If plot.type == "multiple", the following graphics are displayed:
1. The histogram of the p-values.
2. The estimated q-values versus the p-values.
3. The number of significant tests versus each qvalue cutoff.
4. The number of expected false positives versus the number of significant tests.