Cumulative standard deviation: Difference between revisions
Content added Content deleted
(add cl) |
m (eliminate variable used in only one place) |
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(defun standard-deviation (samples) |
(defun standard-deviation (samples) |
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(let (( |
(let ((mean (arithmetic-average samples))) |
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(sqrt (* (/ 1.0d0 (length samples)) |
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(sqrt (* (/ 1.0d0 len) |
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(reduce #'+ samples |
(reduce #'+ samples |
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:key (lambda (x) |
:key (lambda (x) |
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(expt (- x mean) 2.0d0))))))) |
(expt (- x mean) 2.0d0))))))) |
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(defun make-deviator () |
(defun make-deviator () |
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