Implement `incrmwstdev`
Open
difficulty: 3
Feature
Math
- Dominant language
- JavaScript
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Description
Incremental moving weighted standard deviation. `@stdlib/math/statistics/incr/mwstdev`.
Two use cases:
1. Fixed window weights. In which case, should provide a `factory` method to set the weights beforehand.
2. Weights which accompany each value: `accumulator( x, weight )`.
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