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Aurélie_D
‎01-28-2017
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Re: compute effect size

by Calcite | Level 5 in Statistical Procedures
‎01-26-2017 08:22 AM
‎01-26-2017 08:22 AM
hello,   thank you for the reaction. I have a dataset with 1 group measured 2 times, so I used a paired t-test. But as you see when I calculate this in g*power I get a huge effect size. The effect size that I get when using method 1 is different than when I use method 2.   METHOD 1 I compute first the effect size in g*power in the additional window (effect size = 2,56). Then I use this value to calculate the power (power = 1).   METHOD 2 I first calculate the power in SAS (power = 0,9999). Then I use this power value to calculate the effect size in G*power (effect size = 0,68)   Can somebody explain this?   greetings,   Aurélie ... View more

compute effect size

by Calcite | Level 5 in Statistical Procedures
‎01-26-2017 06:01 AM
‎01-26-2017 06:01 AM
hello,   I want to compute the effect size of a variable. mean group1 = 10,978 mean group 2 = 9,228 standard deviation 1 = 0,8402 standard deviation 2 = 0,5767 correlation = 0,59105   I calculated the effecct size with g*power, but the result is 2,56. This is a very high value ? Can I compute this in SAS with this given information, or am I doing something wrong?   greetings,   Aurélie     ... View more
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