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Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

  1. Arrow Sticky Thread Sticky: Please Read This Before Posting

    Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

    Started by quark‎, 11-10-2005 12:21 AM
    • Replies: 0
    • Views: 31,392
    11-10-2005, 12:21 AM Go to last post
  1. Power analysis for GEE

    I am designing a study that would require using GEE (generalized estimating equations) to analyze repeated measures of a dichotomous variable. Is...

    Started by blc‎, 12-07-2015 02:48 PM
    dichotomous dv, gee, repeated measures design
    • Replies: 2
    • Views: 1,551
    12-18-2015, 07:32 PM Go to last post
  2. What analysis do IQ tests use?

    I can't find anywhere what statistical analysis IQ tests (like Weschler scales, BAS, etc.) use. It is not stated in any of their material (that I...

    Started by cmms‎, 12-13-2015 01:53 PM
    factor analysis
    • Replies: 3
    • Views: 1,416
    12-13-2015, 08:34 PM Go to last post
  3. Comparing between correlation coefficients

    Hi, I have experimental design which includes 3 dependent variables (Reading Mind in the Eyes test and 2 other measures of social cognition, for...

    Started by Gilina78‎, 12-13-2015 04:33 PM
    correlations; dependancy, correlations; time series, mancova, regression analysis, zsteiger's z
    • Replies: 0
    • Views: 1,528
    12-13-2015, 04:33 PM Go to last post
  4. What does it mean to norm an instrument say mathematics attitudes scale?

    Hello I was wondering if norming an instrument is the same as developing an instrument say some mathematics attitudes survey or something? I...

    Started by Ilma‎, 12-12-2015 10:21 PM
    • Replies: 1
    • Views: 1,707
    12-13-2015, 04:22 AM Go to last post
  5. marginally significant 3-way interaction ANOVA

    Hi everyone, I have to analyze the data of an intervention study, in which a treatment and control group were tested before and after the...

    Started by dejam‎, 12-12-2015 12:24 PM
    • Replies: 1
    • Views: 1,068
    12-12-2015, 06:23 PM Go to last post
  6. ANCOVA assumptions SPSS help..!

    Hi everyone, Just wondering if someone could help me. I need to conduct a repeated measures ancova (4 levels) with no between subjects factor....

    Started by ANCOVA'D‎, 12-10-2015 06:54 AM
    • Replies: 0
    • Views: 1,400
    12-10-2015, 06:54 AM Go to last post
  7. When to use Bonferroni

    I am working with a mark-all-that-apply survey question that has 8 categorical response options. I am comparing responses statistically between two...

    Started by N. Adams‎, 12-09-2015 03:42 PM
    bonferroni correction, groups, multiple response
    • Replies: 0
    • Views: 1,893
    12-09-2015, 03:42 PM Go to last post
  8. "bias" in chi-square GOF tests?

    Simple question (simple for some people) about the chi-square GOF test: Let's say we do a chi-square GOF test where the the expected values are...

    Started by bruin‎, 12-07-2015 02:14 PM
    • Replies: 1
    • Views: 2,988
    12-07-2015, 02:40 PM Go to last post
  9. Disagreement with my advisor about Cronbach's alpha for my thesis

    My psychology thesis is for an interdisciplinary degree, so I wasn't able to take any advanced methods before completing the research. I took two...

    Started by adtree74‎, 12-06-2015 03:30 PM
    • Replies: 2
    • Views: 1,332
    12-06-2015, 05:34 PM Go to last post
  10. What's a good resource to brush up on college level psychology stats?

    I've taken quite a few different courses, but have since forgotten some of the details. I'm interested in the applied aspects of sampling, all sorts...

    Started by etest‎, 12-02-2015 12:28 PM
    • Replies: 1
    • Views: 1,218
    12-02-2015, 08:24 PM Go to last post
  11. Comparing absolute values of difference scores between two groups

    I have two groups (A and B) that each completed a different version of an experimental measure (measure A and measure B). Both groups also completed...

    Started by ShakeyD‎, 12-01-2015 09:34 PM
    measurement, reliability, variance
    • Replies: 4
    • Views: 1,706
    12-02-2015, 06:19 PM Go to last post
  12. Dealing with Missing Data...

    So I have ran into an issue with my study. We utilized Qualtrics to design an online survey/study that had subjects complete 10 questionnaires and...

    Started by theemezz0‎, 11-30-2015 12:41 PM
    • Replies: 9
    • Views: 3,568
    12-01-2015, 07:19 PM Go to last post
  13. I failed the 4/5ths Rule. Can I prove it is not significant?

    I am a (hypothetical) employer who used an aptitude test to screen candidates for their trainability before hire. I am being sued for discriminating...

    Started by cellardoor367‎, 12-01-2015 11:10 AM
    eeoc, four fifths rule, t test, uniform guidelines
    • Replies: 1
    • Views: 2,147
    12-01-2015, 04:47 PM Go to last post
  14. 3 experiments and the same 3 scales as DV - run Factorial Analysis together or sep

    Hi! I realized three experiments (varying only the marketing context) and used as dependent variables the same three scales (attitude, purchase...

    Started by fabiorfborges‎, 11-30-2015 06:40 AM
    experiments, factor analysis
    • Replies: 1
    • Views: 1,116
    12-01-2015, 08:09 AM Go to last post
  15. Question Repeated measures ANCOVA in SPSS help needed with multiple covariates

    Hello everyone. Hope someone can help. I have a repeated measures (4) ancova I need to run with no between subjects factor. I have 5 covariates....

    Started by ANCOVA'D‎, 11-26-2015 01:15 PM
    ancova, repeated measures
    • Replies: 2
    • Views: 1,389
    11-27-2015, 06:14 AM Go to last post
  16. Help me in two way anova please

    After using log transformation, my data is homogenous. So i want to use two way anova analysis. In that analysis should i data that has been...

    Started by Sabila‎, 11-25-2015 03:42 PM
    • Replies: 3
    • Views: 1,448
    11-26-2015, 03:32 AM Go to last post
  17. Is this data normally distributed?

    Got my question answered. Thank you guys

    Started by paperrockbazooka‎, 11-24-2015 08:22 PM
    • Replies: 5
    • Views: 3,184
    11-26-2015, 02:25 AM Go to last post
  18. Help in Levene's test, Please

    Hi, I did an experiment, studying on the effects of types of sugar and their concentrations on milk spoilage. The sugars I was using are sucrose,...

    Started by bom_bomkung‎, 11-30-2006 09:51 PM
    • Replies: 13
    • Views: 37,514
    11-25-2015, 03:39 PM Go to last post
  19. Incremental validity testing

    Hi everyone, The short story first: I was asked by reviewers to formally test whether a variable V1 is incrementally valid (explains more...

    Started by katsch‎, 11-25-2015 01:00 AM
    • Replies: 0
    • Views: 1,470
    11-25-2015, 01:00 AM Go to last post
  20. t-test help- what is the IV???

    I did an experiment where I got data on children’s playmate choices (like if they chose to play with boys or girls or both or neither). My...

    Started by heeeeeellllllpppppppppp‎, 11-18-2015 03:05 PM
    proportion test
    • Replies: 8
    • Views: 1,547
    11-19-2015, 06:07 AM Go to last post
  21. multiple regfression

    Hello forum.I am very new in statistics so pardon me if the questions are too silly:) Within the frameworks of a lab report, i conducted a multiple...

    Started by LEMONIAS‎, 11-14-2015 11:37 PM
    • Replies: 8
    • Views: 1,459
    11-16-2015, 11:16 PM Go to last post
  22. creating scores based on LCA classification

    With LCA (Mplus) on 11 variables, we grouped 1100 patients into 3 classes. Now, we want to create a score, to classify future patients to one of...

    Started by fengyuwuzu‎, 11-13-2015 10:13 AM
    • Replies: 0
    • Views: 1,195
    11-13-2015, 10:13 AM Go to last post
  23. How to create norms for a new assessment?

    If a novel assessment is created and tested on hundreds of participants, what is the process of converting raw scores to standard scores with a mean...

    Started by blc‎, 11-12-2015 11:19 AM
    • Replies: 1
    • Views: 1,879
    11-12-2015, 11:30 AM Go to last post
  24. Bar graph showing difference of means

    Is there a way to create a bar graph, with multiple DVs, showing the difference between the means of the IV? I have two experimental conditions and...

    Started by Tigerlily‎, 11-09-2015 04:10 PM
    bar graph, difference of means, multiple dv's
    • Replies: 8
    • Views: 2,183
    11-11-2015, 04:57 PM Go to last post
  25. Regression to the mean

    Hello, I have a question concerning regression to the mean. Suppose there is a test X, which is taken by 30 people. Person A has a score of 10...

    Started by Helge‎, 11-06-2015 02:15 PM
    • Replies: 1
    • Views: 1,237
    11-10-2015, 03:09 AM Go to last post
  26. What statistical test should I use.

    So I am writing a report on whether mean intelligence through an IQ test and mean psychopathy scores (DV) are significant in different types of crime...

    Started by TomXD1‎, 11-04-2015 01:17 PM
    analysis, psychology, test
    • Replies: 0
    • Views: 1,448
    11-04-2015, 01:17 PM Go to last post
  27. How do you display the correlation significance level (.08**) in AMOS

    Sorry this is a basic question but I can't figure out how to display the significance level asterisks associated with the correlations/covariances on...

    Started by Cardale‎, 11-03-2015 03:23 PM
    • Replies: 0
    • Views: 806
    11-03-2015, 03:23 PM Go to last post
  28. Question (SPSS) Meta-analysis about control variables in psychology research

    Hello everyone, I'm doing a research on the use of control variables in studies about 'the psychological contract'. I'm almost done with my...

    Started by Paolo‎, 11-03-2015 12:58 PM
    coding, control variables, psychological contract, spss
    • Replies: 0
    • Views: 1,360
    11-03-2015, 12:58 PM Go to last post
  29. Z-Scores: Finding the score which separates the top 40% from the bottom 60%?

    Hi there I am struggling a little with my z-scores. This was one of my questions which I do not understand: For a normal distribution with a mean...

    Started by gpmp1996‎, 11-03-2015 04:36 AM
    • Replies: 1
    • Views: 2,061
    11-03-2015, 09:56 AM Go to last post
  30. If total variance explained is less than 60%...

    I am conducting an exploratory factor analysis of some data exploring bullying behaviour. In my initial EFA I have found that 11 factors were...

    Started by rubyred89‎, 11-01-2015 04:25 PM
    • Replies: 4
    • Views: 2,928
    11-03-2015, 05:17 AM Go to last post
  31. How to analyze dichotomous DV with between- and within-subjects factors?

    Hello everybody, I am designing a study and need to make sure I'll be able to analyze the data (or else I will modify the design). For the...

    Started by blc‎, 10-27-2015 11:04 PM
    dichotomous dv, logit regression, mixed design, multilevel modeling, within-subject
    • Replies: 2
    • Views: 1,579
    10-28-2015, 02:55 PM Go to last post
  32. Physiological response to musical stimuli

    I have performed a study whereby I measure participant’s physiological response (HRV which is a continuous variable) to different musical stimuli....

    Started by p_billy_c‎, 10-26-2015 04:10 AM
    • Replies: 4
    • Views: 1,425
    10-28-2015, 06:59 AM Go to last post
  33. How to analyse data when subjects received both control and experimental condition?

    Dear all, I hope to get some suggestions on how to analyse the data from an experiment I recently ran. My question is whether a new treatment has a...

    Started by Marieke21‎, 10-27-2015 10:09 AM
    control condition, pre-post, repeated measures, treatment
    • Replies: 2
    • Views: 1,213
    10-27-2015, 10:37 AM Go to last post
  34. Checking homogeneity of regression with multiple covariates

    Hi, I am running an ANCOVA with 2 fixed factors, while controlling for 3 covariates, and I would like to test the assumption of homogeneity of...

    Started by nielsl‎, 10-27-2015 08:56 AM
    • Replies: 0
    • Views: 649
    10-27-2015, 08:56 AM Go to last post
  35. Help please with bootstrapping HMR SPSS output interpretation and reporting

    Hi I am in the middle of writing up a lab that is due in 12 hours (eeekkkk!!) and I am having issues interpreting the SPSS output on a bootstrapped...

    Started by Becdev‎, 10-25-2015 05:01 AM
    • Replies: 0
    • Views: 1,308
    10-25-2015, 05:01 AM Go to last post
  36. Non-parametric and parametric tests combined ??

    Hi everyone, I'm achieving a postdoc study in Psychology (75 participants) in Belgium and I need your help... The aim of the study is to look at...

    Started by shaxhe‎, 10-19-2015 08:21 AM
    • Replies: 6
    • Views: 1,595
    10-20-2015, 01:37 PM Go to last post
  37. Post I would really appreciate your Help very important to me

    I have an exam next week and I got sample questions that look like these two below: It would really help if someone would explain me just a...

    Started by Henrico‎, 10-20-2015 01:09 PM
    • Replies: 0
    • Views: 1,079
    10-20-2015, 01:09 PM Go to last post
  38. presenting the results of logistic regression with dichotomous IVs

    I have a question about how to present the results of a series of 6 logistic regressions in which I have the same 2 dichotomous/binary IVs. The...

    Started by charles matthew‎, 10-18-2015 08:38 PM
    binary outcome, dichotomous iv, logistic regression, presentation
    • Replies: 1
    • Views: 1,329
    10-19-2015, 08:13 AM Go to last post
  39. w-score vs. z-score with age/sex covariate

    Hi everyone, I want to predict gray matter (GM) volume in a group of patients based on their degree of cognitive impairment, corrected for age and...

    Started by AnLo‎, 10-15-2015 10:14 AM
    • Replies: 0
    • Views: 1,519
    10-15-2015, 10:14 AM Go to last post
  40. Research statistics conundrum!

    Hello, I'm completing my proposal for my dissertation and I've gotten to the statistical analysis and having a bit of a me***own, hoping to get some...

    Started by getlonelyy‎, 10-15-2015 04:16 AM
    • Replies: 0
    • Views: 1,074
    10-15-2015, 04:16 AM Go to last post
  41. MANOVA vs Chi Square (and continuous variables?)

    **edited to add: Hmmm, maybe I should have named the thread MANOVA vs. Chi Square vs. two regression analyses?** Hi all, I'm in the final stages...

    Started by jessireebob‎, 10-11-2015 09:22 AM
    • Replies: 0
    • Views: 1,036
    10-11-2015, 09:22 AM Go to last post

    I am formulating a study which involves first separating participants into two groups for a specific sleep disorder experienced either no/low fear ...

    Started by yudkush‎, 10-05-2015 08:14 PM
    • Replies: 0
    • Views: 1,571
    10-05-2015, 08:14 PM Go to last post
  43. psych stats

    vampires in rumanian are 315 years old, on average, with a standard deviation of 5, and the distribution of their ages is mound-shaped and...

    Started by dorion83‎, 10-02-2015 05:59 PM
    • Replies: 3
    • Views: 1,352
    10-02-2015, 07:10 PM Go to last post
  44. Thumbs up value for the balance of 2 categories (while controlling for absolute number)

    Hi! Thank you so much for any help! Situation: I have different ascriptions per subject which are categorized in female (f), male (m) and...

    Started by Nelly2‎, 10-02-2015 09:07 AM
    • Replies: 0
    • Views: 850
    10-02-2015, 09:07 AM Go to last post
  45. Subscale CFA

    Hi, An existing questionnaire I am using (23 items, supposedly 2 subscales, N = 700) has shown poor fit to the 2-factor model as specified by its...

    Started by nielsl‎, 10-01-2015 08:35 AM
    • Replies: 2
    • Views: 1,409
    10-02-2015, 04:34 AM Go to last post
  46. four way anova

    Hi, I conduct a research with 4 between-subjects independent variables (2 levels each) and 1 dependant variable. I intrested to find out if there...

    Started by natan1‎, 09-30-2015 09:20 AM
    • Replies: 1
    • Views: 1,880
    09-30-2015, 11:38 AM Go to last post
  47. Question Implications for analysis of survey data when recall time frames differ bt questions

    Hi, I am advising some folks on setting up a brief survey containing questions that measure some well-known health indicators. My curiosity was...

    Started by SabbyATL‎, 09-25-2015 11:48 AM
    recall, survey, time frames
    • Replies: 6
    • Views: 2,594
    09-30-2015, 10:05 AM Go to last post
  48. Logistic Regression Question

    I have a continuous predictor variable (a score in a class) from 0 to 100 and a binary outcome variable for the passing of a different class...

    Started by Psych_Lab_Rat‎, 09-28-2015 11:55 AM
    • Replies: 1
    • Views: 1,489
    09-28-2015, 12:54 PM Go to last post
  49. Inter-rater reliability for multiple choice questions, 5 raters per question

    Hi, I'm interested in how people describe messages posted online, so I'm asking people to read messages and choose their topics. My goal is then...

    Started by replica‎, 09-27-2015 08:28 AM
    • Replies: 0
    • Views: 773
    09-27-2015, 08:28 AM Go to last post
  50. Check if Groups differ from Expectation Value

    Hi! I have data from RCT with one treatment group and one control group. Each participant filled out a questionnaire once a weak (stanine scores),...

    Started by LeslieL‎, 09-26-2015 02:16 PM
    • Replies: 0
    • Views: 1,023
    09-26-2015, 02:16 PM Go to last post
  51. R squared in structural equation modeling

    Hello I recently started working with structural equation modeling. I am doing a study for which I tested a model like this: Var1 --> var2-->...

    Started by Stef Van Puyenbroeck‎, 08-05-2015 06:24 AM
    r squared, sem, structural equation model
    • Replies: 8
    • Views: 3,890
    09-23-2015, 07:49 AM Go to last post
  52. Growth Modeling of Longitudinal Data: Growth factors as predictors in Regression

    Hey! i have this following situation. I have a dataset of four measurement occasions. In the first three occasions the same test was introduced....

    Started by schadeati‎, 09-22-2015 04:52 AM
    • Replies: 0
    • Views: 1,121
    09-22-2015, 04:52 AM Go to last post
  53. difference between mailed cohorts and control cohorts

    what is the difference between mailed cohorts and control cohorts Ive been given this data to analyse but I'm not sure on what cols2 and 3 refer...

    Started by dispersion‎, 09-21-2015 02:04 PM
    • Replies: 1
    • Views: 1,478
    09-21-2015, 02:24 PM Go to last post
  54. experiemental items in factor analysis

    Good morning, everyone. We are analyzing a questionnaire data set, which has some core items and some experimental items. The core items are those...

    Started by fengyuwuzu‎, 09-21-2015 09:32 AM
    • Replies: 0
    • Views: 1,203
    09-21-2015, 09:32 AM Go to last post
  55. Calculating Partial Correlation from Published Work

    I am working on a meta-analysis, and I read in a published meta-analysis that the researchers calculated partial correlations controlling for two...

    Started by vltompkins‎, 09-20-2015 08:54 PM
    calculating correlation, partial correlation
    • Replies: 1
    • Views: 1,413
    09-21-2015, 02:40 AM Go to last post
  56. Calculating effect size at T2 while controling for baseline differences.

    Hi Everyone, I would really appreciate some pointers how I might calculate a treatment V control effect size at T2 (using means, SD's, and sample...

    Started by PavolovsDog‎, 09-20-2015 10:56 AM
    • Replies: 0
    • Views: 1,171
    09-20-2015, 10:56 AM Go to last post
  57. Transforming a negatively skewed ikert scale dependent variable for ANOVA and M.Reg

    Hello, I have a negatively skewed Likert scale as my dependent variable and would like to use parametric testing (multiple regression and ANOVA)....

    Started by Muppet‎, 09-19-2015 04:08 AM
    likert, negative skew, transformation
    • Replies: 4
    • Views: 1,493
    09-19-2015, 05:01 PM Go to last post
  58. Mixed method ANOVA post hoc confusion?

    My experiment had a between-subjects variable of condition (experimental and control) and a within-subjects variable of time (baseline and follow-up...

    Started by fellis‎, 09-19-2015 12:18 PM
    • Replies: 1
    • Views: 1,008
    09-19-2015, 01:25 PM Go to last post
  59. How to measure- effect of additional categorical DV on repeated m. ANOVA?

    Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly...

    Started by ecramer‎, 09-18-2015 09:07 PM
    anova, categorical covariate, data analysis, repeated measures
    • Replies: 4
    • Views: 1,354
    09-19-2015, 01:03 PM Go to last post
  60. Unhappy HELP PLEASE :) ANOVAs repeated measures

    More I read more I get confused, so please help me ! 1. In 2 (2 conditions)x2 (2 time intervals) within subjects Anova if normality assumption is...

    Started by Kinga‎, 09-18-2015 03:47 PM
    anova, one-way anova, repeated measures, within-subjects
    • Replies: 0
    • Views: 1,021
    09-18-2015, 03:47 PM Go to last post

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