HuasoFoundries /
math_histogram
| @@ 428-441 (lines=14) @@ | ||
| 425 | * @see sum2() |
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| 426 | * @see sumN() |
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| 427 | */ |
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| 428 | public function sum() |
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| 429 | { |
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| 430 | if (!array_key_exists('sum', $this->_calculatedValues)) { |
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| 431 | try { |
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| 432 | $sum = $this->sumN(1); |
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| 433 | $this->_calculatedValues['sum'] = $sum; |
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| 434 | } catch (\PEAR_Exception $e) { |
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| 435 | return $sum; |
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| 436 | } |
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| 437 | } |
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| 438 | return $this->_calculatedValues['sum']; |
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| 439 | } |
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| 440 | ||
| 441 | /** |
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| 442 | * Calculates SUM { (xi)^2 } |
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| 443 | * Handles cummulative data sets correctly |
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| 444 | * |
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| @@ 451-463 (lines=13) @@ | ||
| 448 | * @see sum() |
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| 449 | * @see sumN() |
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| 450 | */ |
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| 451 | public function sum2() |
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| 452 | { |
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| 453 | if (!array_key_exists('sum2', $this->_calculatedValues)) { |
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| 454 | try { |
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| 455 | $sum2 = $this->sumN(2); |
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| 456 | $this->_calculatedValues['sum2'] = $sum2; |
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| 457 | } catch (\PEAR_Exception $e) { |
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| 458 | return $sum2; |
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| 459 | } |
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| 460 | } |
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| 461 | return $this->_calculatedValues['sum2']; |
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| 462 | } |
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| 463 | ||
| 464 | /** |
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| 465 | * Calculates SUM { (xi)^n } |
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| 466 | * Handles cummulative data sets correctly |
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| @@ 503-516 (lines=14) @@ | ||
| 500 | * a PEAR_Error object otherwise |
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| 501 | * @see productN() |
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| 502 | */ |
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| 503 | public function product() |
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| 504 | { |
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| 505 | if (!array_key_exists('product', $this->_calculatedValues)) { |
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| 506 | try { |
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| 507 | $product = $this->productN(1); |
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| 508 | $this->_calculatedValues['product'] = $product; |
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| 509 | } catch (\PEAR_Exception $e) { |
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| 510 | return $product; |
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| 511 | } |
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| 512 | } |
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| 513 | return $this->_calculatedValues['product']; |
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| 514 | } |
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| 515 | ||
| 516 | /** |
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| 517 | * Calculates PROD { (xi)^n }, which is the product of all observations |
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| 518 | * Handles cummulative data sets correctly |
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| 519 | * |
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| @@ 660-673 (lines=14) @@ | ||
| 657 | * @see __sumdiff() |
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| 658 | * @see count() |
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| 659 | */ |
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| 660 | public function variance() |
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| 661 | { |
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| 662 | if (!array_key_exists('variance', $this->_calculatedValues)) { |
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| 663 | try { |
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| 664 | $variance = $this->__calcVariance(); |
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| 665 | } catch (\PEAR_Exception $e) { |
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| 666 | return $variance; |
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| 667 | } |
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| 668 | ||
| 669 | $this->_calculatedValues['variance'] = $variance; |
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| 670 | } |
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| 671 | return $this->_calculatedValues['variance']; |
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| 672 | } |
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| 673 | ||
| 674 | /** |
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| 675 | * Calculates the standard deviation (unbiased) of the data points in the set |
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| 676 | * Handles cummulative data sets correctly |
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| @@ 683-696 (lines=14) @@ | ||
| 680 | * @see calc() |
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| 681 | * @see variance() |
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| 682 | */ |
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| 683 | public function stDev() |
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| 684 | { |
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| 685 | if (!array_key_exists('stDev', $this->_calculatedValues)) { |
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| 686 | try { |
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| 687 | $variance = $this->variance(); |
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| 688 | } catch (\PEAR_Exception $e) { |
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| 689 | return $variance; |
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| 690 | } |
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| 691 | ||
| 692 | $this->_calculatedValues['stDev'] = sqrt($variance); |
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| 693 | } |
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| 694 | return $this->_calculatedValues['stDev']; |
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| 695 | } |
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| 696 | ||
| 697 | /** |
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| 698 | * Calculates the variance (unbiased) of the data points in the set |
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| 699 | * given a fixed mean (average) value. Not used in calcBasic(), calcFull() |
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| @@ 749-762 (lines=14) @@ | ||
| 746 | * @see count() |
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| 747 | * @see absDevWithMean() |
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| 748 | */ |
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| 749 | public function absDev() |
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| 750 | { |
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| 751 | if (!array_key_exists('absDev', $this->_calculatedValues)) { |
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| 752 | try { |
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| 753 | $absDev = $this->__calcAbsoluteDeviation(); |
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| 754 | } catch (\PEAR_Exception $e) { |
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| 755 | return $absDev; |
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| 756 | } |
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| 757 | ||
| 758 | $this->_calculatedValues['absDev'] = $absDev; |
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| 759 | } |
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| 760 | return $this->_calculatedValues['absDev']; |
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| 761 | } |
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| 762 | ||
| 763 | /** |
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| 764 | * Calculates the absolute deviation of the data points in the set |
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| 765 | * given a fixed mean (average) value. Not used in calcBasic(), calcFull() |
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| @@ 1360-1372 (lines=13) @@ | ||
| 1357 | * @see quartiles() |
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| 1358 | * @see interquartileRange() |
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| 1359 | */ |
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| 1360 | public function quartileDeviation() |
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| 1361 | { |
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| 1362 | if (!array_key_exists('quartileDeviation', $this->_calculatedValues)) { |
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| 1363 | try { |
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| 1364 | $iqr = $this->interquartileRange(); |
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| 1365 | } catch (\PEAR_Exception $e) { |
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| 1366 | return $iqr; |
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| 1367 | } |
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| 1368 | $this->_calculatedValues['quartileDeviation'] = $iqr / 2; |
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| 1369 | } |
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| 1370 | return $this->_calculatedValues['quartileDeviation']; |
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| 1371 | } |
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| 1372 | ||
| 1373 | /** |
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| 1374 | * The quartile variation coefficient is defined as follows: |
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| 1375 | * |
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