A graduation card for your math and stats nerd!
Or a thank you card for your math and stats teacher!
In mathematics and statistics, y with that accent on top is called y-hat. Therefore, y without the accent means it has no hat. The equation shown is a rearrangement of the equation to calculate the difference between "y with a hat" and "y without a hat." Hence the caption "hats off."
For a nerdier explanation, "y-hat" represents a predicted value on a regression line, whereas "y" represents the true observed value of a data point. The calculation of the difference between "y" and "y-hat" is a calculation of the residual... it tells you how close or far your predicted value is from the actual value.
Greeting: hats off to you
Size: 5.5 x 4.25 in (14 x 10.8 cm)
Quantity: 1 card with envelope
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