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Cost to send a letter via the USPS correlates with...
| Variable | Correlation | Years | Has img? |
| Google searches for 'i am dizzy' | r=0.98 | 17yrs | Yes! |
| Church & Dwight Co.'s stock price (CHD) | r=0.98 | 17yrs | No |
| Microsoft's Worldwide Earnings | r=0.97 | 17yrs | No |
| Associates degrees awarded in gender studies | r=0.97 | 11yrs | Yes! |
| Wind power generated in France | r=0.97 | 16yrs | No |
| The number of nurse practitioners in Idaho | r=0.96 | 11yrs | No |
| Popularity of the first name Theodore | r=0.96 | 17yrs | No |
| Google searches for 'do i need to go to the doctor' | r=0.96 | 17yrs | No |
| Google searches for 'what is my zodiac sign' | r=0.95 | 17yrs | Yes! |
| Associates degrees awarded in linguistics | r=0.95 | 11yrs | Yes! |
| NIKE, Inc.'s stock price (NKE) | r=0.94 | 17yrs | No |
| Hydopower energy generated in Burundi | r=0.94 | 16yrs | Yes! |
| Annual US household spending on pork | r=0.92 | 17yrs | No |
| The number of statisticians in Vermont | r=0.88 | 17yrs | No |
| The number of opticians in Puerto Rico | r=0.86 | 17yrs | Yes! |
| US Rice Consumption | r=0.8 | 14yrs | Yes! |
| The number of private detectives in Ohio | r=0.73 | 17yrs | No |
Cost to send a letter via the USPS also correlates with...
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You caught me! While it would be intuitive to sort only by "correlation," I have a big, weird database. If I sort only by correlation, often all the top results are from some one or two very large datasets (like the weather or labor statistics), and it overwhelms the page.
I can't show you *all* the correlations, because my database would get too large and this page would take a very long time to load. Instead I opt to show you a subset, and I sort them by a magic system score. It starts with the correlation, but penalizes variables that repeat from the same dataset. (It also gives a bonus to variables I happen to find interesting.)