Question

Can someone tell me the definition of tukey's and duncan's test? and what is the difference between tukey's and duncan test? and when do I perform each test?

Answer 1

Tukey's test - It is a procedure and Statistical tind means that are other, single step mutiple compasison test. It can be used to significantly different food exch The formula for Tukey's Tot is: 9s - Yn - Y0 SE Where YA is the larger of the two means being compared, YB is the smaller of the two means being conkised, and SE is the standard essor of the son of the means This is value can then be compared to a q value from the studentized sange distaibution. If the Is vaker is larger than the critical value I obtained from the distribution , the two means are said to be significantly different at level a O< < 1: Auncan's developed multiple muttiple dongo test : It is a multiple composison procedure by David B. Duncan in 1955. Auncan's range test belongs to the general class of compasison pocelube that use the studertized statistic go to compare sets of means.

Difference between Tukey's & duncan test o Tukey is the best for all possible baiswise comparisons when simple sizes are unequal on confidence intervals we needed very good even with equal sample sizes without confidence intervals. Duncan use for comparing each of the others , but to each other. me not sample ("Control) to comparing the others @ In Duncan treatment significant Easily all test there is no need for control and there is no need for checking differences among the treatments (f vake). the treatment I could be compared. Howeres Tukey test is like LSA ac could do this test that the and means se compared with a test and when f is meaningful constant value. & Auncar test only produces information but Tukey porduces p value for of each pair of conditions. Tukey conservative than Duncan test. of sanges compression test is more

Duncan's regative a MRT is especially (Type 11) essor at greater disk of protective against the expense of making false pot talse having of making false estors. oth positive Type 1) Duncan's test ich armony used in agronomy & other agricuthercal remarch Duncan multiple range test is used for : Duncan's multiple range test, or Duncan's test of Auncan's new multiple range test to provides significance levels for the difference between any Mais 07 means . Voegardless of whether al. significant f resulted from an initial analysis go ranjance. e Tukey test used foo :- Tupey's multiple comparison tost is one og several that that can be used to determine ! Ctlich means amongst a set of means difter from the rest . Tukey's multiple comparison test is also called Tukey's honestly significant difference test of Tukey's HSA. It is based on the studentized dange distribution.