Output | P-Value Operations | Volcano Plot(s)

Volcano Plot(s)
The Volcano Plot tab, which is created when either of the inverse variance methods for combining p-values has been selected as the Method to Use and an Effect ID Variable has been specified, is shown below:
The Volcano Plot tab contains the following elements:
When an inverse variance method has been used to combine p -values, a scatter plot shows the meta-analysis p -values and estimates of the overall effect. The y -axis variable of this scatter plot is the meta-analysis p -value, converted to the -log or -log 10 scale if selected in the process dialog . The x -axis plots the estimate of the overall effect estimate for each effect, calculated by a weighted average of the individual study effects, where effect estimates can be regression coefficients or log odds ratios for example.
A horizontal reference line is drawn as a red, dashed line at the significance level that was specified. For -log or -log 10 -converted p -values, effects above this line are significant; for p -values on the original scale, effects below the line are significant.