t-tests

  1. J

    Let me know a better analysis method?

    I have two IVs; "collection method" (online and classroom) and "culture" (A and B), one continuous variable ("Age") and 8 DVs (well-being variables and self-construal variables). I wanted to see if the two cultures were different in those DVs controlling for "collection method" and "Age". My...
  2. S

    Trying to analyze aggregated data

    Hi, I would like to know how it would be possible to make a t-test with aggregated data on SPSS or R. My dataset looks like this: Region......Question.....%positive.......%negative......n 1..............15...............20...................45............2956...
  3. H

    Can I use Partial Eta Squared for t-tests?

    Hi, I am currently trying to decide which effect size is the most appropriate for my results. I have conducted a repeated measures ANOVA, there are five variables in the ANOVA, all of which are within samples. I have used the partial eta squared value as the effect size for the overall...
  4. T

    Hotelling's Trace v. Hotelling's T^2- Why make the move?

    Hello, I am writing a dissertation and my chair wants me to convert Hotelling's Trace (resulting from my MANOVA) into Hotelling's T^2. No problem to actually do, but what I cannot find in research, and what my chair won't tell me, is why I would do this. The Trace shows the sum of the SSM/SSR...
  5. Z

    Paired Sample t-tests do not link up with the Repeated-Measures ANOVA

    Hello, I'm currently writing up my results section for my dissertation that's looking at the nocebo effect. I'm using a repeated-measures ANOVA that has three factors each with two levels, synchronicity (synchronous vs. asynchronous), phase (pre-conditioning vs. post-conditioning), and...
  6. J

    t-tests for correlated data

    Our data set includes correlated data (i.e. respondents included some siblings from the same family). In multivariate analyses, we used GEE to adjust for that, but is there a way to adjust for the intraclass correlations when doing t-tests? Thanks for whatever help you can provide.
  7. M

    Compare groups according to significant differences in mean day spending per person

    Please accept my apologies, the question to follow has probably been posted already a million times. Nevertheless, the whole flood of numbers is somehow overwhelming me and I can't just not figure out which statistical measures are the right ones for my particular research project. :( I...
  8. D

    Testing data to determine proficiency.

    Hi, I have been giving a work project and I believe that I need to use t-tests to get to my results, but don't know what results I need to get to determine how long it takes our new hire employees to reach proficiency. I have 3 separate data sets (approx 70,000 lines of excel data) which...
  9. W

    Appropriate tests for comparing 2 normally distributed datasets (ttest?)

    Hello, It's been a while since my A-level statistics course so I just want to make sure I'm doing the appropriate test for my data. I'm a PhD student working in X-ray crystallography. My situation is that I have 2 populations of data, of varying sizes, in one population the samples have...
  10. D

    Controlling for type-1 error

    We have conducted an experiment that asks respondents to rate whether they thought an article was biased on an 11-point scale, with 0 being biased to one side, 6, not biased at all and 11, biased against the other side. We used two organizations, each that supports different sides of the...
  11. I

    Can't run Independent-Samples T-test

    Hello, everyone, I need a piece of your help on a popular question of Statistical Test Choosing :confused: I have an Experimental Group and a Control Group I have pre-test scores for both groups the experimental group receives a treatment then I have Post-tests scores for both groups...
  12. S

    Help! Which test do I use and how?! *very rusty graduate*

    Hi all I have been given some data and I need to do some significance testing on it. The data revolves around food types. Firstly I have been given data, about 1000 rows, of a food type with the date the food was bought and date it went off, I need to test whether after X number of days, a...
  13. S

    Comparing two means

    Hi. I have some trouble comparing two means in SPSS. I am writing a thesis about audit exemption in Norway, and have found 48 000 companies in the population. 11 000 of these are registrated with e - mail, and are used in my sample. To defend this sample I have to compare the mean of...
  14. A

    Statistics advice

    Hello, I have 6 independent groups and one dependent variable. I did a univariate ANOVA analysis and the overall group significance was not significant. Is it okay to compare individual groups with the control group and do a series of unpaired t-tests? Do I need to do a Bonferroni...
  15. A

    Comparing two groups on multiple DVs

    Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under my belt but nothing very helpful! The issue is this: I have two groups (high and low on a measure), and I am comparing them on 12 different...