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multiples slopes comparisson with ANCOVA

By Daniel | Apr 29, 2018 08:23PM CEST

When the software XLStat compares multiple slopes of linear regressions (i.e. five different lines - linear regressions -), does the software make some correction for multiple comparisons? Example, correct the comparisons using Bonferroni? I see that you can select to compare the slopes "by pairs", but I do not know if those comparisons are corrected to avoid errors.

In other words, I can see that you can choose Bonferroni, or Tukey, or Fischer, or SNK, etc ... but I do not know if it is only used to correct the comparisons of MEAN values or also for the comparison of the SLOPES of the different groups.

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By Efthalia | May 01, 2018 11:53AM CEST | XLSTAT Agent

Hello Daniel,
A two-sample student test without a correction is used.
Regards,

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