Equation 4 · Part 1 · Building a Deployment Safety System That Actually Holds
Symbol pi
What this part means
the base rate.
Its job in the formula
pi is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol pi→Article meaning
Where the article explains it
where and are the true- and false-positive rates and is the base rate.
The passage around this formula
where and are the true- and false-positive rates and is the base rate. Plugging in = 0.98 , = 0.01 and = 0.0005 gives a precision of roughly 4.7%: more than nineteen out of twenty flagged requests are false alarms, even though the classifier’s headline accuracy sounds close to perfect. This is not a defect specific…
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the article section
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