| 55 | }; |
| 56 | |
| 57 | inline |
| 58 | void |
| 59 | updateSumSquaredDeviations(double &ioLeftNumRows, double &ioLeftSumExp, |
| 60 | double &ioLeftSumObsSquareOverExp, double &ioLeftSumObs, |
| 61 | double &ioLeftSumSquaredDeviations, |
| 62 | double inRightNumRows, double inRightSumExp, |
| 63 | double inRightSumObsSquareOverExp, double inRightSumObs, |
| 64 | double inRightSumSquaredDeviations) { |
| 65 | |
| 66 | if (inRightNumRows <= 0) |
| 67 | return; |
| 68 | |
| 69 | // FIXME: Use compensated sums for numerical stability |
| 70 | // http://jira.madlib.net/browse/MADLIB-501 |
| 71 | ioLeftSumSquaredDeviations |
| 72 | += inRightSumSquaredDeviations |
| 73 | + ioLeftSumExp * inRightSumObsSquareOverExp |
| 74 | + ioLeftSumObsSquareOverExp * inRightSumExp |
| 75 | - 2 * ioLeftSumObs * inRightSumObs; |
| 76 | |
| 77 | ioLeftNumRows += inRightNumRows; |
| 78 | ioLeftSumExp += inRightSumExp; |
| 79 | ioLeftSumObsSquareOverExp += inRightSumObsSquareOverExp; |
| 80 | ioLeftSumObs += inRightSumObs; |
| 81 | } |
| 82 | |
| 83 | AnyType |
| 84 | chi2_gof_test_transition::run(AnyType &args) { |