Hi, Has there been any change in the TTEST between SAS Version 9.2 and 9.4? I was told that a value for a sample size determined using version 9.2 is now different if I calculate it using the same parameters in version 9.4. I'd appreciate confirmation of a change or confirmation that the calculation has not changed and that my result should be the same given the same parameters. If anyone is curious to calculate the sample size, here are the relevant parameters: Two-sided T Test for Mean Difference, normal distribution, exact method, null difference = 0, alpha = 0.01, mean difference = 4, nominal power = 0.9, number of sides = 2, and standard deviation = 5. Version 9.4 gives an answer of 49 whereas 9.2 supposedly gives an answer of 48. I've tried the calculation with other software and always get 49 so is version 9.2 buggy or does it also correctly give a value of 49? Appreciate any confirmation - thanks!
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