2 Dataset Name: Nelson (Nelson.dat)
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5 Starting Values (lines 41 to 43)
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6 Certified Values (lines 41 to 48)
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7 Data (lines 61 to 188)
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9 Procedure: Nonlinear Least Squares Regression
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11 Description: These data are the result of a study involving
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12 the analysis of performance degradation data from
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13 accelerated tests, published in IEEE Transactions
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14 on Reliability. The response variable is dialectric
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15 breakdown strength in kilo-volts, and the predictor
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16 variables are time in weeks and temperature in degrees
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20 Reference: Nelson, W. (1981).
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21 Analysis of Performance-Degradation Data.
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22 IEEE Transactions on Reliability.
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23 Vol. 2, R-30, No. 2, pp. 149-155.
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25 Data: 1 Response ( y = dialectric breakdown strength)
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26 2 Predictors (x1 = time; x2 = temperature)
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28 Average Level of Difficulty
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31 Model: Exponential Class
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32 3 Parameters (b1 to b3)
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34 log[y] = b1 - b2*x1 * exp[-b3*x2] + e
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38 Starting values Certified Values
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40 Start 1 Start 2 Parameter Standard Deviation
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41 b1 = 2 2.5 2.5906836021E+00 1.9149996413E-02
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42 b2 = 0.0001 0.000000005 5.6177717026E-09 6.1124096540E-09
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43 b3 = -0.01 -0.05 -5.7701013174E-02 3.9572366543E-03
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45 Residual Sum of Squares: 3.7976833176E+00
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46 Residual Standard Deviation: 1.7430280130E-01
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47 Degrees of Freedom: 125
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48 Number of Observations: 128
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