Bartlett's Test Calculator
Bartlett's test is used to test the assumption that variances are equal (homogeneous) across groups.
For help in using this calculator, read the
FrequentlyAsked Questions or review the
Sample Problem.
To learn more about Bartlett's test, read Stat Trek's
tutorial on Bartlett's test.
 Enter inputs in unshaded text boxes.
 Click the Calculate button to produce outputs.



FrequentlyAsked Questions
Instructions: To find the answer to a frequentlyasked
question, simply click on the question.
Sample Problem
Problem 1
The table below shows sample data and variance for five groups. How would you test the assumption that variances are equal across groups?
Group 1 
Group 2 
Group 3 
Group 4 
Group 5 
Sample Data 
1 2 3 4 5 
1 3 5 7 9 
1 4 7 10 13 
1 5 9 13 17 
1 6 11 16 21 
Variance 
2.5 
10 
22.5 
40 
62.5 
One option would be to use Stat Trek's Bartlett's Test Calculator. Simply, take the following steps:
 Enter the number of groups (5).
 Enter the significance level. For this problem, we'll use 0.05.
 For each group, enter sample size.
 For each group, enter a sample estimate of group variance.
Then, click the Calculate button to produce the output shown below:
From the calculator, we see that the test statistic (T) is 8.92. Assuming equal variances in groups and given a significance level of 0.05,
the probability of observing a test statistic (T) bigger than 8.92 is given by the Pvalue.
Since the Pvalue (0.06) is bigger than the significance level (0.05), we cannot reject the null hypothesis
of equal variances across groups.
Note: To see the hand calculations required to solve this problem, go to
Bartlett's Test for Homogeneity of Variance: Example 1.