The easiest way to use Google Correlate is to put in a search term and let Google determine the correlation curve for you. I used the search term I used on by previous post - "EVE Online" - and got this result.
That's really cynical, I know. It could just be that people want to know how to make ISK in general. However, there are many ways to make ISK in EVE Online, but bots are only feasible for mining and missions. That would explain the correlations between mining, ships and ISK rather handily in my mind. And I can't forget all that Russian activity I mentioned in the Google Trend post.
Anyway, back to Google Correlate. You can also provide your own correlation curves to try and match. Now, I'm no mathematician and I took Probability and Statistics a very, very long time ago, but I can still manage an Excel spreadsheet and that is all Google needs. So I decided to gin up a couple of slapdash curves and see what I got.
The first "curve" I based off the example Google gave. Their example looked for searches correlated to the Winter Solstice. They had a rather nifty equation for creating a COS waveform for weekly values. I decided I'd try the same thing but use EVE Online expansion dates rather than a solstice date. That was a little complicated. For one thing, Solstices happen on relatively easy to calculate dates: EVE Expansions... not so much. However, I decided I'd create a weekly COS normalization (I hope that's the right term, damn that class was a long time ago) based on the days between expansions. Here is the equation and you can look at the raw Excel spreadsheet here. It's nothing fancy, but the equation is there.
Value = 0.5 + 0.5 * COS(RADIANS(360 / (Next_Expansion_Date - Last_Expansion_Date) * (Week_Date-Last_Expansion_Date)))Yeah, that's a beast but it works. Here's the curve it returned when I got everything done.
Anyway, I think I need to keep thinking about how to supply meaningful data to Google Correlate in order to get some better results. Until then there is always the method of entering a search string and letting Google provide the mathematical muscle. If I discover anything interesting I'll be sure to tell you. If you give this a try yourself and discover something interesting, please share!