# How do you find the pairwise comparison?

## How do you find the pairwise comparison?

The formula for the number of independent pairwise comparisons is k(k-1)/2, where k is the number of conditions. If we had three conditions, this would work out as 3(3-1)/2 = 3, and these pairwise comparisons would be Gap 1 vs.

## What is weighted Bonferroni Holm procedure?

In statistics, the Holm–Bonferroni method, also called the Holm method or Bonferroni–Holm method, is used to counteract the problem of multiple comparisons. It is intended to control the family-wise error rate and offers a simple test uniformly more powerful than the Bonferroni correction.

What is Holm Sidak method?

The Holm-Sidak test is a step-down “recursive reject”, because it applies an accept/reject criterion on a sorted set of null hypothesis, starting from the lower p-value and going up to the acceptance of null hypothesis. For each comparison, the alpha value is set according to Sidak correction of Bonferroni inequality.

How do you perform a Bonferroni correction?

To perform the correction, simply divide the original alpha level (most like set to 0.05) by the number of tests being performed. The output from the equation is a Bonferroni-corrected p value which will be the new threshold that needs to be reached for a single test to be classed as significant.

### How do you do Anova single factor in Excel?

To perform a single factor ANOVA, execute the following steps.

1. On the Data tab, in the Analysis group, click Data Analysis.
2. Select Anova: Single Factor and click OK.
3. Click in the Input Range box and select the range A2:C10.
4. Click in the Output Range box and select cell E1.
5. Click OK.

### When to use Holm multiple comparisons in prism?

Prism can perform the Holm multiple comparisons test as part of several analyses: •Following one-way ANOVA. This makes sense when you are comparing selected pairs of means, with the selection based on experimental design. Prism also lets you choose Bonferroni tests when comparing every mean with every other mean.

Which is more powerful Holm or Sidak method?

In contrast, Holm’s method can be used to analyze any set of P values, and is not restricted to use as a followup test after ANOVA. •The Šídák modification of the Holm test makes it a bit more powerful, especially when there are many comparisons.

Is the Holm multiple comparison test a confidence interval test?

•The Holm multiple comparison test cannot compute confidence intervals for the difference between means. •The method is also called the Holm step-down method. • Although usually attributed to Holm, in fact this method was first described explicitly by Ryan (3) so is sometimes called the Ryan-Holm step down method.

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