HuasoFoundries /
math_histogram
| @@ 608-626 (lines=19) @@ | ||
| 605 | * @see sum() |
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| 606 | * @see count() |
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| 607 | */ |
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| 608 | public function mean() |
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| 609 | { |
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| 610 | if (!array_key_exists('mean', $this->_calculatedValues)) { |
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| 611 | try { |
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| 612 | $sum = $this->sum(); |
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| 613 | try { |
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| 614 | $count = $this->count(); |
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| 615 | } catch (\PEAR_Exception $e) { |
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| 616 | return $count; |
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| 617 | } |
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| 618 | $this->_calculatedValues['mean'] = $sum / $count; |
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| 619 | } catch (\PEAR_Exception $e) { |
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| 620 | return $sum; |
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| 621 | } |
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| 622 | } |
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| 623 | return $this->_calculatedValues['mean']; |
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| 624 | } |
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| 625 | ||
| 626 | /** |
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| 627 | * Calculates the range of the data set = max - min |
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| 628 | * |
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| 629 | * @access public |
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| @@ 632-652 (lines=21) @@ | ||
| 629 | * @access public |
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| 630 | * @return mixed the value of the range on success, a PEAR_Error object otherwise. |
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| 631 | */ |
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| 632 | public function range() |
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| 633 | { |
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| 634 | if (!array_key_exists('range', $this->_calculatedValues)) { |
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| 635 | try { |
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| 636 | $min = $this->min(); |
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| 637 | try { |
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| 638 | $max = $this->max(); |
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| 639 | } catch (\PEAR_Exception $e) { |
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| 640 | return $max; |
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| 641 | } |
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| 642 | $this->_calculatedValues['range'] = $max - $min; |
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| 643 | } catch (\PEAR_Exception $e) { |
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| 644 | return $min; |
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| 645 | } |
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| 646 | } |
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| 647 | return $this->_calculatedValues['range']; |
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| 648 | } |
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| 649 | ||
| 650 | /** |
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| 651 | * Calculates the variance (unbiased) of the data points in the set |
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| 652 | * Handles cummulative data sets correctly |
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| 653 | * |
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| 654 | * @access public |
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| 655 | * @return mixed the variance value on success, a PEAR_Error object otherwise |
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| @@ 960-978 (lines=19) @@ | ||
| 957 | * @see max() |
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| 958 | * @see calc() |
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| 959 | */ |
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| 960 | public function midrange() |
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| 961 | { |
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| 962 | if (!array_key_exists('midrange', $this->_calculatedValues)) { |
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| 963 | try { |
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| 964 | $min = $this->min(); |
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| 965 | try { |
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| 966 | $max = $this->max(); |
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| 967 | } catch (\PEAR_Exception $e) { |
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| 968 | return $max; |
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| 969 | } |
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| 970 | } catch (\PEAR_Exception $e) { |
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| 971 | return $min; |
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| 972 | } |
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| 973 | ||
| 974 | $this->_calculatedValues['midrange'] = (($max + $min) / 2); |
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| 975 | } |
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| 976 | return $this->_calculatedValues['midrange']; |
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| 977 | } |
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| 978 | ||
| 979 | /** |
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| 980 | * Calculates the geometrical mean of the data points in the set |
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| 981 | * Handles cummulative data sets correctly |
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| @@ 1192-1209 (lines=18) @@ | ||
| 1189 | * @see count() |
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| 1190 | * @see calc() |
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| 1191 | */ |
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| 1192 | public function stdErrorOfMean() |
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| 1193 | { |
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| 1194 | if (!array_key_exists('stdErrorOfMean', $this->_calculatedValues)) { |
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| 1195 | try { |
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| 1196 | $count = $this->count(); |
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| 1197 | } catch (\PEAR_Exception $e) { |
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| 1198 | return $count; |
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| 1199 | } |
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| 1200 | try { |
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| 1201 | $stDev = $this->stDev(); |
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| 1202 | } catch (\PEAR_Exception $e) { |
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| 1203 | return $stDev; |
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| 1204 | } |
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| 1205 | $this->_calculatedValues['stdErrorOfMean'] = $stDev / sqrt($count); |
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| 1206 | } |
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| 1207 | return $this->_calculatedValues['stdErrorOfMean']; |
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| 1208 | } |
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| 1209 | ||
| 1210 | /** |
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| 1211 | * Calculates the value frequency table of a data set. |
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| 1212 | * Handles cummulative data sets correctly |
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