pub struct StdDev<T> { /* private fields */ }Expand description
Standard deviation aggregation index using Welford’s algorithm.
Welford’s algorithm computes variance and standard deviation incrementally by maintaining:
mean: running mean (M in the algorithm)sum_sq_diff: sum of squared differences from the mean (S in the algorithm)count: number of samples (n in the algorithm)
This index does not hold samples, thus requiring only O(1) space.
Returns 0.0 when count < 2 (need at least 2 samples for std dev).
Warning: This implementation is susceptible to numerical instability for very large datasets or values with high variance.
Implementations§
Trait Implementations§
impl<T: Copy> Copy for StdDev<T>
Source§impl<T: Clone> ShallowClone for StdDev<T>
impl<T: Clone> ShallowClone for StdDev<T>
fn shallow_clone(&self) -> Self
Auto Trait Implementations§
impl<T> Freeze for StdDev<T>
impl<T> RefUnwindSafe for StdDev<T>where
T: RefUnwindSafe,
impl<T> Send for StdDev<T>where
T: Send,
impl<T> Sync for StdDev<T>where
T: Sync,
impl<T> Unpin for StdDev<T>where
T: Unpin,
impl<T> UnsafeUnpin for StdDev<T>
impl<T> UnwindSafe for StdDev<T>where
T: UnwindSafe,
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