| NIST/ITL StRD | |
| Dataset Name: Nelson (Nelson.dat) | |
| File Format: ASCII | |
| Starting Values (lines 41 to 43) | |
| Certified Values (lines 41 to 48) | |
| Data (lines 61 to 188) | |
| Procedure: Nonlinear Least Squares Regression | |
| Description: These data are the result of a study involving | |
| the analysis of performance degradation data from | |
| accelerated tests, published in IEEE Transactions | |
| on Reliability. The response variable is dialectric | |
| breakdown strength in kilo-volts, and the predictor | |
| variables are time in weeks and temperature in degrees | |
| Celcius. | |
| Reference: Nelson, W. (1981). | |
| Analysis of Performance-Degradation Data. | |
| IEEE Transactions on Reliability. | |
| Vol. 2, R-30, No. 2, pp. 149-155. | |
| Data: 1 Response ( y = dialectric breakdown strength) | |
| 2 Predictors (x1 = time; x2 = temperature) | |
| 128 Observations | |
| Average Level of Difficulty | |
| Observed Data | |
| Model: Exponential Class | |
| 3 Parameters (b1 to b3) | |
| log[y] = b1 - b2*x1 * exp[-b3*x2] + e | |
| Starting values Certified Values | |
| Start 1 Start 2 Parameter Standard Deviation | |
| b1 = 2 2.5 2.5906836021E+00 1.9149996413E-02 | |
| b2 = 0.0001 0.000000005 5.6177717026E-09 6.1124096540E-09 | |
| b3 = -0.01 -0.05 -5.7701013174E-02 3.9572366543E-03 | |
| Residual Sum of Squares: 3.7976833176E+00 | |
| Residual Standard Deviation: 1.7430280130E-01 | |
| Degrees of Freedom: 125 | |
| Number of Observations: 128 | |
| Data: y x1 x2 | |
| 15.00E0 1E0 180E0 | |
| 17.00E0 1E0 180E0 | |
| 15.50E0 1E0 180E0 | |
| 16.50E0 1E0 180E0 | |
| 15.50E0 1E0 225E0 | |
| 15.00E0 1E0 225E0 | |
| 16.00E0 1E0 225E0 | |
| 14.50E0 1E0 225E0 | |
| 15.00E0 1E0 250E0 | |
| 14.50E0 1E0 250E0 | |
| 12.50E0 1E0 250E0 | |
| 11.00E0 1E0 250E0 | |
| 14.00E0 1E0 275E0 | |
| 13.00E0 1E0 275E0 | |
| 14.00E0 1E0 275E0 | |
| 11.50E0 1E0 275E0 | |
| 14.00E0 2E0 180E0 | |
| 16.00E0 2E0 180E0 | |
| 13.00E0 2E0 180E0 | |
| 13.50E0 2E0 180E0 | |
| 13.00E0 2E0 225E0 | |
| 13.50E0 2E0 225E0 | |
| 12.50E0 2E0 225E0 | |
| 12.50E0 2E0 225E0 | |
| 12.50E0 2E0 250E0 | |
| 12.00E0 2E0 250E0 | |
| 11.50E0 2E0 250E0 | |
| 12.00E0 2E0 250E0 | |
| 13.00E0 2E0 275E0 | |
| 11.50E0 2E0 275E0 | |
| 13.00E0 2E0 275E0 | |
| 12.50E0 2E0 275E0 | |
| 13.50E0 4E0 180E0 | |
| 17.50E0 4E0 180E0 | |
| 17.50E0 4E0 180E0 | |
| 13.50E0 4E0 180E0 | |
| 12.50E0 4E0 225E0 | |
| 12.50E0 4E0 225E0 | |
| 15.00E0 4E0 225E0 | |
| 13.00E0 4E0 225E0 | |
| 12.00E0 4E0 250E0 | |
| 13.00E0 4E0 250E0 | |
| 12.00E0 4E0 250E0 | |
| 13.50E0 4E0 250E0 | |
| 10.00E0 4E0 275E0 | |
| 11.50E0 4E0 275E0 | |
| 11.00E0 4E0 275E0 | |
| 9.50E0 4E0 275E0 | |
| 15.00E0 8E0 180E0 | |
| 15.00E0 8E0 180E0 | |
| 15.50E0 8E0 180E0 | |
| 16.00E0 8E0 180E0 | |
| 13.00E0 8E0 225E0 | |
| 10.50E0 8E0 225E0 | |
| 13.50E0 8E0 225E0 | |
| 14.00E0 8E0 225E0 | |
| 12.50E0 8E0 250E0 | |
| 12.00E0 8E0 250E0 | |
| 11.50E0 8E0 250E0 | |
| 11.50E0 8E0 250E0 | |
| 6.50E0 8E0 275E0 | |
| 5.50E0 8E0 275E0 | |
| 6.00E0 8E0 275E0 | |
| 6.00E0 8E0 275E0 | |
| 18.50E0 16E0 180E0 | |
| 17.00E0 16E0 180E0 | |
| 15.30E0 16E0 180E0 | |
| 16.00E0 16E0 180E0 | |
| 13.00E0 16E0 225E0 | |
| 14.00E0 16E0 225E0 | |
| 12.50E0 16E0 225E0 | |
| 11.00E0 16E0 225E0 | |
| 12.00E0 16E0 250E0 | |
| 12.00E0 16E0 250E0 | |
| 11.50E0 16E0 250E0 | |
| 12.00E0 16E0 250E0 | |
| 6.00E0 16E0 275E0 | |
| 6.00E0 16E0 275E0 | |
| 5.00E0 16E0 275E0 | |
| 5.50E0 16E0 275E0 | |
| 12.50E0 32E0 180E0 | |
| 13.00E0 32E0 180E0 | |
| 16.00E0 32E0 180E0 | |
| 12.00E0 32E0 180E0 | |
| 11.00E0 32E0 225E0 | |
| 9.50E0 32E0 225E0 | |
| 11.00E0 32E0 225E0 | |
| 11.00E0 32E0 225E0 | |
| 11.00E0 32E0 250E0 | |
| 10.00E0 32E0 250E0 | |
| 10.50E0 32E0 250E0 | |
| 10.50E0 32E0 250E0 | |
| 2.70E0 32E0 275E0 | |
| 2.70E0 32E0 275E0 | |
| 2.50E0 32E0 275E0 | |
| 2.40E0 32E0 275E0 | |
| 13.00E0 48E0 180E0 | |
| 13.50E0 48E0 180E0 | |
| 16.50E0 48E0 180E0 | |
| 13.60E0 48E0 180E0 | |
| 11.50E0 48E0 225E0 | |
| 10.50E0 48E0 225E0 | |
| 13.50E0 48E0 225E0 | |
| 12.00E0 48E0 225E0 | |
| 7.00E0 48E0 250E0 | |
| 6.90E0 48E0 250E0 | |
| 8.80E0 48E0 250E0 | |
| 7.90E0 48E0 250E0 | |
| 1.20E0 48E0 275E0 | |
| 1.50E0 48E0 275E0 | |
| 1.00E0 48E0 275E0 | |
| 1.50E0 48E0 275E0 | |
| 13.00E0 64E0 180E0 | |
| 12.50E0 64E0 180E0 | |
| 16.50E0 64E0 180E0 | |
| 16.00E0 64E0 180E0 | |
| 11.00E0 64E0 225E0 | |
| 11.50E0 64E0 225E0 | |
| 10.50E0 64E0 225E0 | |
| 10.00E0 64E0 225E0 | |
| 7.27E0 64E0 250E0 | |
| 7.50E0 64E0 250E0 | |
| 6.70E0 64E0 250E0 | |
| 7.60E0 64E0 250E0 | |
| 1.50E0 64E0 275E0 | |
| 1.00E0 64E0 275E0 | |
| 1.20E0 64E0 275E0 | |
| 1.20E0 64E0 275E0 |