test

  1. V

    Categorical variable ; pre and post intervention

    Hi all, I really need help with this one. I am trying to see if my population change their alcohol habits between before and after an psychosocial intervention. We asked the participants : how many days per week do you consume alcohol ? a. Never b. 1 to 2 days per week c. 3 to 4 days per...
  2. H

    Generalisation of 'overlapping confidence intervals'

    I had a question about a common (possibly incorrect) trend in the medical field to look at whether two 95% confidence intervals overlap as a sign of statistical significance at the 95% level. I'm aware this is overly conservative. I've heard that 83% confidence intervals are 'better' but not...
  3. D

    Which statistical test do I need to use?

    I have a dataset showing the yearly stock returns for two investment styles (growth and value investing) as well as a column showing the difference between the returns for each year. I have attached a picture below. I want to do a test to see if the difference is significant for each individual...
  4. J

    Which test to use? Two continuous variables vs one categorical variable.

    Hello All, I am PhD student in the throes of data analysis and writing up. I’d like to ask for your expert opinions on which statistical test/s would be most appropriate for a particular problem, please. I’m trying to test the relationship for two continuous variables (carbon [d13C] and...
  5. G

    Choosing the Statistical Test (if exists)

    Hi! I'm new here and I need help with this: The data: I have 1000+ subjects each one scanned with a MR 3 times (with different sequence T1, T2 and IR). Each scan yields (after a segmentation) to the 15 volumes of the brain region in study (the brain region has 15 "sections" which volumes' are...
  6. S

    Which Test of Significane to use when comapring two interfaces using likert statements?

    Hello guys, i googled so much but i can't find an answer to my question. I hope you can help me out. I have the following problem: In a user study the same participants had to use two different user interfaces for entering their preferences. Both interfaces were designed from scratch. There...
  7. B

    Which test to use to compare results between groups

    Hello We have collected data related to performance (satisfactory/unsatisfactory) in a whole lot of assessment criteria, and are looking for the best way to analyse these data in addition to the obvious comparisons based on percentages. We have collected data from individuals, in terms of the...
  8. helgasaraswati

    White Test For Heteroskedasticity In R Commander

    I am trying to realize the white test on my linear model with R and White Test For Heteroskedasticity In R Commander
  9. S

    Need Appropriate Test for comparing a series of measurements from one bone to another

    My research involves taking measurements at 9 sections at different locations on the shaft of bones. I am having trouble determining which statistical methods I can use to test for significant difference in the distribution and change of the measurements as they progress along the shaft of the...
  10. F

    significance test begin of puberty

    Hello, I am running a metaanalysis about the age of girls and boys at the beginning of puberty (Tanner-stages) and it would be great if someone could help me out with two questions about significance tests for mean/median value differences. question 1: In SPSS I have the data of the...
  11. A

    Stats Novice: Help finding if 1 value affects another

    Apologies I have learning trouble and stats are a particularly weak point. Im doing research on 10 animals species, and their conservation status at 3 time periods. (1990, 2009, 2017). Statuses range of 7 values, from data deficient, threatened ect. to extinct. Against the number of...
  12. Z

    Looking for appropriate non-parametric test for 5 dependent group & small sample size

    What is the most appropriate parametric test for repeated observations for multiple dependent groups.
  13. K

    Stats Help needed for a project!

    Hi Stats Fans, I need your help, as I am stuck with data I collected for a project. I am currently gathering responses about mitigation strategies against fatigue. I am questioning people about what mitigation strategies against fatigue they have experienced as helpful. It is a multiple...
  14. 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...
  15. N

    significance of the difference between two values

    Hello all, I'm working on a skew-normal distribution and would like to know if the difference between 2 values of the data set is significant. It's the distribution of Mutual Information between couples of lemmas (100,000 of them). You can see the distribution on the jpg image. What I...
  16. B

    Please help: ANOVA

    I'm asking a group of young people who have experienced loss to complete the Posttraumatic Growth Inventory and then a sheet about different factors identified in previous research (age, gender, support network, religious beliefs, etc). I then want to see if there are any correlations between...
  17. H

    Stata: Test that the difference between two groups = -1

    Does anyone know how to test the hypothesis that the difference between people without and with kids = -1 per night in Stata? I have the data set with kids as a dummy variable, but can't figure out where to start.
  18. E

    Which Test To Use?

    Short version: 2-3 IVs (date, individual, compartment), repeated-measures(compartment), 20 DVs, non-parametric. Hello, I have 4 subjects that were tested 16 times. However, possible changes across time or individuals are not the subjects of the experiment, so would it be appropriate to...
  19. H

    Help! What statistical analysis test should I use?

    Hello, I am no good at statistics and need help figuring out which statistical test I should use for a hypothetical research project. This is for a paper- I am not actually doing the research. Therefore, I probably have not defined all of variables necessary...but here goes...your help is...
  20. M

    General linear mixed model - 5 years

    Dear all, every help is highly appreciated! I have a data set that looks like the one I attached to this post. I have five independent variables for each company (for each time period one). Now I need to know, if the values significantly increase over the time of five year. In other words I...