Estimating parameters for growth curves

When you use a parametric growth curve to evaluate failure data, Minitab provides three methods for estimating the parameters.
  • Maximum likelihood estimation (MLE)
  • Conditional maximum likelihood estimation (CMLE)
  • Least squares estimation (LSE)
This table summarizes the features available with each estimation method.
Feature MLE CMLE LSE
Exact standard error and confidence interval for the shape No Yes No
Asymptotic standard error and confidence interval for the shape Yes No No
Asymptotic standard error and confidence interval for the scale Yes No No
Non-iterative solutions, even when data are from multiple systems No Yes Yes
Comparison of estimates between growth curves Yes Yes No
Available for interval data Yes No Yes
Available when the shape is specified Yes No Yes
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