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  1. R

    Estimating sample size when you know the effect size will be reduced (compared to previous studies)

    Hi, I am planning a follow-up experiment to a previous study and have a question about estimating sample size: For the sake of simplicity, the previous study showed that Condition 1 had more accurate responses (64%) than Condition 2 (41%) and a paired samples t-test was significant...
  2. R

    Simplifying Binomial Coefficients with large numbers, i.e., factorials of large numbers

    Hi, I'm reading a paper about stats in psychology (https://www.ejwagenmakers.com/2007/pValueProblems.pdf) and there is an equation in there that I cannot work out. I'm not a mathematician, but as I understand, the binomial coefficient could be simpified as such: 1000! / 500!(1000!- 500!)...
  3. R

    Calculate Standard Error over averaged responses or raw responses?

    OK so it's example 1? Or is there even a 'correct' choice? Example 2 might be more appropriate because it doesn't throw any data away i.e., it is calculating variance of every observation from the average. On the other hand, if we aren't allowed to use multiple responses from the same...
  4. R

    Calculate Standard Error over averaged responses or raw responses?

    Yes, that's correct. Is example 2 still the best way to calculate SE?
  5. R

    Calculate Standard Error over averaged responses or raw responses?

    Thank you for your response - it makes sense! PPT refers to participant (i.e., PPT 1 is data observed from first participant ,whereas PPT 2 is data from second participant, and so on). I expected this was the answer, but it is interesting because a lot of standard text books don't discuss this...
  6. R

    Calculate Standard Error over averaged responses or raw responses?

    Hi, I would like to calculate the standard error of my Dependent Variable. However, I have psycholinguistic data, which uses multiple ppts and multiple items. Thus, there are 2 ways of doing this: either by calculating SE over averaged responses (example 1) OR by calcualting SEs over raw...