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Data source: USDA
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Average number of milk cows in the United States correlates with...

Variable	Correlation	Years	Has img?
Popularity of the first name Robin	r=0.97	43yrs	No
Popularity of the first name Sylvia	r=0.97	43yrs	No
Popularity of the first name Stacy	r=0.97	43yrs	No
Popularity of the first name Russell	r=0.96	43yrs	No
Popularity of the first name Crystal	r=0.96	43yrs	No
Popularity of the first name Amy	r=0.96	43yrs	No
Popularity of the first name Lisa	r=0.95	43yrs	No
How clickbait-y CGP Grey YouTube video titles are	r=0.95	12yrs	No
Popularity of the first name Tara	r=0.95	43yrs	No
Popularity of the first name Jennifer	r=0.94	43yrs	No
Popularity of the first name Heather	r=0.94	43yrs	No
Popularity of the first name Jay	r=0.94	43yrs	No
Popularity of the first name Howard	r=0.94	43yrs	No
The number of septic tank servicers and sewer pipe cleaners in Virginia	r=0.93	20yrs	No
Popularity of the first name Sonya	r=0.93	43yrs	No
Popularity of the first name Theresa	r=0.93	43yrs	No
Popularity of the first name Duane	r=0.93	43yrs	No
Popularity of the first name Valerie	r=0.93	43yrs	No
Popularity of the first name Bobby	r=0.93	43yrs	No
Popularity of the first name Charles	r=0.92	43yrs	No
Popularity of the first name Adam	r=0.92	43yrs	No
Popularity of the first name Bernadette	r=0.92	43yrs	No
The number of pharmacists in Massachusetts	r=0.92	20yrs	No
Popularity of the first name Walter	r=0.92	43yrs	No
Popularity of the first name Paula	r=0.92	43yrs	No
Popularity of the first name Dana	r=0.91	43yrs	No
Annual US household spending on pets, toys, and hobbies	r=0.91	23yrs	No
Popularity of the first name Carl	r=0.9	43yrs	No
Ryanair Holdings' stock price (RYAAY)	r=0.9	21yrs	No
Popularity of the first name George	r=0.9	43yrs	No
Air pollution in San Diego, California	r=0.88	43yrs	No
Popularity of the first name Shannon	r=0.88	43yrs	No
Popularity of the first name Amanda	r=0.88	43yrs	No
Popularity of the first name Lara	r=0.86	43yrs	No
The number of graphic designers in California	r=0.83	20yrs	No
Arson in Illinois	r=0.81	38yrs	No
Air pollution in Portland, Oregon	r=0.76	43yrs	No
Air pollution in Minneapolis	r=0.66	43yrs	No
Air pollution in Tulsa, Oklahoma	r=0.62	43yrs	No
Air quality in Portland, Oregon	r=-0.54	43yrs	No
Boston Celtics' NBA season loss count	r=-0.58	43yrs	No
Popularity of the first name Miriam	r=-0.87	43yrs	No

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Average number of milk cows in the United States also correlates with...

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^{What is Sys. Score?} 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.)