The following tables provide the critical value for *q*(*k, df, α*) for *α* = .10, .05 and .01 and values of *k* up to 20. Following these tables, we provide additional tables for *α* =.05, .025, .01, .005 and .001 and values of *k* up to 40, but with less granularity for higher values of *df*. See Unplanned Comparisons for ANOVA for more details.

**First group of tables**

**Alpha = 0.10**

**Alpha = 0.01**

**Alpha = 0.05**

**Alpha = 0.005**

Can you please tell me what the Q statistic is for alpha 0.05, df 21 and k 3? The numbers are so small I’m not sure I am reading them correctly.

Actually, is there a place where I can download these with greater resolution so that I can read all the numbers?

Sonja, if you download the Excel workbook with all the examples in this website, you will also find the table of Q statistics. Just go to http://www.real-statistics.com/free-download/real-statistics-examples-workbook/ for the free download. Charles

Sonja, it is 3.565. Charles

This question is regarding to one of the components of Tukey’s HSD procedure which is studentised range statistic i.e.q(k, df, α). Here I have k=9, df=441 and α=0.05.So in order to find q, I need to refer the critical values table and look for k=9 and df=441. But all the tables I get have values of df till 120 or 240 and then infinity. Since i am looking for df=441 which row of df should I use: 240 or Infinity? Hope my conveyance of the question is clear to you. Please help. Thanks

Sarthak,

After 240 you should use infinity. In the next release of the software you will be able to enter df = 441, but there will only be a small difference between that value and the value for infinity.

Charles