familywise error

  1. S

    When to control for multiple comparisons?

    I have a test that I have given people, and it is looking at two particular variables. Each variable has two item types. So either an item is, for example, nice or mean, or passionate or dispassionate. I wanted to look at whether responses to nice and mean items were differentially affected...
  2. N

    Post hoc comparisons. How to do the grouping?

    Hi all, Can anyone help me trying to understand how to do the grouping at the end of the post-hoc procedure in the one way ANOVA? For each kind of test (LSD, Bonferroni, Tukey, Scheffé etc) I can understand the way it calculates the confidence interval and how it check if the means of each...
  3. A

    Family-wise error rate in T test and ANOVA

    I'm using one psychological questionnaire that consists of 3 sub scales. As part of the data analysis, I want to carry out 2 Independent sample T tests and 1 one-way ANOVA for each sub scale. I need to do the ANOVA because the independent variable in this case (age) has 4 levels. So my question...
  4. B

    How to test for group differences in questionnaire responses

    The original project involved giving different forms of instruction to three different groups. We also gave participants a questionnaire regarding previous knowledge of the subject, how many college courses they've taken, and how much they liked the instruction formats. Because of group...
  5. B

    Controlling for familywise error for large correlations matrix

    Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise error and false discovery rate (e.g. http://www.unt.edu/rss/class/mike/5030/articles/falsediscovery2.pdf) but still do not have a clear idea on how...