Test for Equal Shapes or Scales Across Growth Curves
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When your failure/repair data are from more than one growth curve, Minitab first performs an analysis on each growth curve. Then it uses the resulting parameter estimates to provide a likelihood ratio test for:

·    Equal shapes across groups - if you do not provide a known shape

·    Equal scales across groups - if you provide a known shape

·    Equal MTBFs across groups - if the shape is set at 1

The hypotheses for these tests are:

·    H0: all of the shapes (or scales or MTBFs) are equal

·    H1: at least one of the shapes (or scales or MTBFs) is different

Note    These tests are not available for interval data.