anova

  1. R

    Which ANOVA?

    Hi there :) I am struggling to determine which would be the most appropriate ANOVA analysis to use for some work I am doing. I have 3 independent groups: control, CBT group, and CBT + antidepressant group. For each individual, there are 2 pieces of data- before and after treatment...
  2. F

    Pooling time points to perform a Fisher test?

    Hello, I am currently trying to analyse an experiment to assess if rats with cerebral malformations have a sensitivity deficit on one of their front paws. I put 2 sticky dots on their front paws then look which side they turn to first. I repeated this over 4 trials. So my data look like...
  3. C

    Can I use ANOV for testing how correlation coefficient varies in condition??

    Hi everyone, I have a problem with the statistical analysis of my data namely I want to look into how anatomical values correlate with some electrophysiological ones, in different condition. Trying to simplify and explain, I want to relate the volume of some brain structures (a, b, c) to an...
  4. T

    Regression for comparing two groups on one variable? And t-test with survey data?

    Hi - I have two populations / groups that I need to compare on one variable. Now usually I would use a t-test or anova but ive been told that these are unable to be used with survey data in stata. Is this correct advice - can I not use a t-test or anova in stata with survey data? And would a...
  5. T

    2x2x3 Anova, what will it tell me?

    Hi - I would like to compare the means of a DV (emotional intelligence) between three different variables, those being; 1) Gender (are the emotional intelligence scores between males and females significantly different etc. etc.) 2) Group (again with two levels - one group with a disability...
  6. T

    Which analysis to choose? Urgent

    Hi, any help is greatly appreciated. I have data from the same children at ages 4, 7 and 11 for a variable (self-regulation) created from a questionnaire. The data for this variable is numbers from 1-4 (the mean of their scores from the questionnaire). I need to compare the differences...
  7. E

    Anova without intercept?

    Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says “no intercept”. Once I do that, the test results become significant! Is it okay to do that? Thanks very much
  8. P

    ANOVA on simple proportional accuracy scores versus on d prime indexes

    To answer this, you would need to know what d prime is. Here is a link: http://www-psych.stanford.edu/~lera/psych115s/notes/signal/ The method I used is z-score "hits minus false alarms" When I run an ANOVA on simple proportional accuracy scores I find no interaction between condition A...
  9. C

    Variance / Anova Questions

    I have readings taken at 20 different positions for 3 different treatments ( x 3 reps). The mean for each treatment is different. I am not interested in testing for significant differences in the means, i am interested only in the level of variation. a) I want to determine if the level of...
  10. J

    Help!! a little confused with ANOVA, should be easy

    Dear all, I would like to ask for your help in determining which test I should run for my samples. Here is my data: I have 4 water samples of Nitrite (mg/l) from 3 sites. Site1:.00171, .00206, .00031, .00066 Site3:.00136, .00206, .00415, .00275 Site4:.02193, .02298, .02681, .01531 My...
  11. F

    GLM on non-linear/curvilinear data

    Dear all! I’m sure somebody of you will help me with my non-linear data-problem. I measured a fitness correlate of an animal (response variable) and want to investigate the effect of the following predictor variable: gender (male/female), temperature (9, 12, 15, 18, 21, 24 °C), population (four...
  12. S

    Generalized Least Squares (and ANOVA type III)

    Dear all, I ran a type III ANOVA on a model of this kind: gls(y~x1+x2+x3). I found that both x2 and x3 are significant. However, if I drop x3 from the analysis (gls(y~x1+x2), then no independent variable is significant. If I drop x2 instead (gls(y~x1+x3), x3 is significant. So, basically...
  13. J

    Engineering research tests: comparing post hoc data and paring

    Hello - I have several tests to do but my stats is a bit rusty... They are all based on the deflection of different beam designs: Test 1 Beam design A (n=4) is loaded and deflection measured Beam design A (n=4) is loaded, but with a changed contact, and deflection measured Test 2 Beam design B...
  14. U

    Are the parametric analyses appropriate?

    In an experimental study, the aesthetic value (independent var) of a picture is manipulated into (low and high quality). "Low Quality" -- to make it look less appealing; and "High Quality" to make it look "very attractive." I want to examine the effect of "Low" and "High" Quality images on the...
  15. U

    Examine the effect of one independent var

    Hi, I want to examine the effect of still images (independent var) with two levels (monochromatic and multi-color) on mood perception (dependent var) of participants. What is the appropriate analysis I must conduct in this case? Furthermore, I conduct a regression analysis to examine the...
  16. G

    Cave Temperature Analysis, Real life management issues.

    Hi, I've taken math course's up to Calc III and Diff Eq, but never a statistics course. So I was hoping this forum could help me. I am working with 10+years of temperature data taken from several loggers throughout a cave system. The loggers record temperature every 30mins, which I have...
  17. R

    Question about permutations ANOVA test

    Hello everyone, I have data of a variable from 4 sites, with 3 repetitions from each site. Tests revealed that I do have homoscedasticity but no normality. So I chose to use a test of permutations to ANOVA. A few days ago someone told me that I cannot do this test if I have 4 sites and only 3...
  18. B

    SPSS association tests

    Hi, I have completed a UNIANOVA in SPSS to test the association of several variables against a final score dependant variable. Some of the variables are coming through with no means in the estimates tables but with pairwise comparisons, and some are coming through the other way round...
  19. U

    What type of ANOVA test should I do?

    The same participants are exposed to two different screen sizes 27" (stimulus A) and screen size 9.7" (stimulus B). Independent var is "screen" with two levels - sizes. After exposure to stimulus A, they fill two questionnaires to answer dependent variables Y1 and Y2. After that, they are...
  20. U

    compare groups and examine relationships

    Hi, 1.I am planning to examine the level of user engagement of participants playing a particular computer game, that has two versions, one in color and the other one in black and white. I understand that I can conduct a one way-within subject test ANOVA to compare the means of the two groups...