Hi Chris;

I'll try again.

I downloaded all 5 or larger quakes from 1973 to early October 2003 from NEIC, a little short of 31 years.

The file contains 47036 quakes and 11233 days for an average of 4.18 per day.

I compared each flare to this database and counted quakes per day for the 30 days following each flare. These data are listed for each flare.

A cumulative count was also made, the total quakes per day for all the flares. This is what is plotted (and listed).

The chi-square calculation is also shown in the output file. Chi-square calculates the amount of deviation between the observed and expected values and a table shows you if the amount is significant and to what degree.

In this case, it shows that the quakes per day vary too much to be represented by an average number, suggesting some kind of effect at work.

Clear?

Roger