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| a | b/w.sd.R | ||
|---|---|---|---|
| 1 | w.sd = |
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| 2 | function (x, w) |
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| 3 | { |
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| 4 | sumw = sum(w) |
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| 5 | sumw.sq = sum(w)^2 |
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| 6 | w.sq = sum(w^2) |
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| 7 | denom = sum(w * ((x - mean(x))^2)) |
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| 8 | sqrt((sumw * denom) / (sumw.sq - w.sq)) |
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| 9 | } |
| a | b/w.sd.R | ||
|---|---|---|---|
| 1 | w.sd = |
||
| 2 | function (x, w) |
||
| 3 | { |
||
| 4 | sumw = sum(w) |
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| 5 | sumw.sq = sum(w)^2 |
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| 6 | w.sq = sum(w^2) |
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| 7 | denom = sum(w * ((x - mean(x))^2)) |
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| 8 | sqrt((sumw * denom) / (sumw.sq - w.sq)) |
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| 9 | } |