data analysis

  1. G

    Stores and ordered rank of products

    I have data about popularity of some products in some stores. For each of the stores I have only a ordered rank of best-selling products in them. I need help how to find information about which products are popular only in certain stores versus products that are popular in all stores.
  2. R

    What are some data mining techniques for analyzing cause of disease

    I have a dataset of 300 observations, of which 200 are normal, and the rest have the disease. I have the cognitive assessment scores of these 300 participants, and the assessment is divided into different sections: delusions, depression, anxiety, etc. I'm wondering what technique(s) would be...
  3. P

    interpreting ModMed results

    Can we interpret ModMed results if our indirect effect is significant (Class Intervals don't include zero) but our interactions are not significant (CI includes zero)? Please may you guide me to an article which I can quote w.r.t your response? Thanks in advance!
  4. P

    Interpreting Mediation results

    Hello, I have a few questions regarding interpretation of my results for Mediation using Hayes' Process macro. The key point for finding significance is to see that the Class Interval does not include zero. However, in my mediation model, although the indirect effect CI doesn't include zero...
  5. M

    Help with non normality distribution. Transformations didn't work. Help!

    Hi, new to this forum. I'm writing up my MsC in psychology and I've got problems with my data. The study involved administering questionnaires to 157 young carers. The dependent variables I've got are: emotional symptoms, peer problems, prosocial behaviour, hyperactivity, difficulties...
  6. F

    Seeking Stats/Maths Experts for Help Determining Possible Analysis of Complex Data

    Dear all, I have recently started a new job and have taken on a large and complex data set. I do not think meaningful analysis is possible, but I am hopeful that I am wrong. I am seeking answers to two questions; 1. Have I correctly calculated the possible combinations of answers & if so...
  7. M

    Time series analysis with external events in R

    I have a time series of daily website visitors and several different marketing events (some continuous for several days). I would like to determine what impact did those marketing events have on website visitors dynamics. What approach would you suggest in terms of analysis ? I'm working with R...
  8. N

    Need data analysis direction.

    I’m a grad student (clinical psychology) and research neophyte and need some direction. Once I gain statistical ground I would be more than happy to help others. Even though this is a mixed-methods study, I just need quantitative help. My focus is on perpetrators who harass the same victim...
  9. I

    Case studies for loyalty management (insight extraction)

    Hi all, I have just been called for an interview with a loyalty management company. I have been told that my data mining skills will be assessed using case studies. Given that this will be my first job if I succeed and so I am not entirely familiar with all the problems affecting real...
  10. J

    dendrogram graph - how many clusters would you pick in this with reasons why?

    Hi having a little problem with this question which i need to learn for my test coming up.. i have produced a dendrogram (on sas enterprise) which consists of 77 countrys with various information. I need to discuss the graph and explain how many clusters i would pick and why? (its more...
  11. K

    Scatterplot relationship issue.

    Hi, the data below is just a sample of the data I am trying to enter into a scatterplot. The issue is that a previous correlation test shows a p value of 0.011, a clear relationship. However, when I took the averages of 196 entries of the data below, the scatterplot shows little...
  12. A

    Question about what test to run when comparing groups.

    I am doing a research study on the effects of study methods on exam performance. I have already administered a survey and collected data from students asking them what study method they plan to use on an upcoming exam (highlighting, re-reading, or self-testing). All students were required to...
  13. A

    Where can I find real data for ANOVA for a project?

    Where can I find real data for ANOVA for a project? I have my semester project due soon and I need to get real life data to use for the analysis. I searched but didn't get the best results. any one know any website?
  14. D

    Question about model validation.

    I'm working on a problem on my own (not for class or work) and I just wanted to get some outside opinions before I progress further. As far as my background, I've taken some introductory statistics courses for psychology majors, and an intro probability and statistics course for engineers...
  15. R

    SPSS Question Regarding entering data and calculation

    Hi, i am doing a research on stress level and i have 2 questionnaire and the total no. of respondents is 60. First questionnaire has been measured on a 6 point likert scale and it has total 16 questions. Second questionnaire has been measured on 5 point likert scale and it has total 46...
  16. H

    Re: Help needed for forecasting model

    Hi, I have a dataset of some monthly usage values. I have to forecast the for the next 12 months. I have taken log of data for ease of use. It seems to me that ARMA(2,0,2) model fits best for it. Can you confirm if I am right or wrong? If it is, please tell me which one fits the best. Also...
  17. A

    What analysis should I run?

    Hi, I am not sure which analysis to run based on what I am trying to figure out, any guidance is appreciated. The research question is- are certain ethnicities more likely to report their ethnicity in the online classroom? Data- I have a variable of ethnicities (1= Caucasian, 2= African...
  18. W

    Minitab/Excel to Analyze Data - What do I use?

    Hi, I've been collecting data from a couple different experiments I've been running the lab. I run a mixing system through runs with solid material. The material is the same but some of the properties keep changing when I put it in (pH, %-solids) and are recorded through tests. I take T=0...
  19. K

    crazy p-value

    I am taking data analysis, and am having a bit of trouble. It has been a couple years since i took intro to stats, so i am very rusty. I performed a t-test (two sided, and both alternates) on Sleuth 2 ex0222, and I get a p value with an negative exponent. this seems ridiculous to me, and I...
  20. C

    Whether / how to combine 2 linear equations for different variables, and weighting

    I'm analysing results from measurements of 2 variables (a, b). The goal is to use them singly or together to determine a 3rd variable, c. All 3 variables are instrumented, measured data (not social science). We made over 5000 simultaneous measurements of a & b. Our equipment software gave us...