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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: 27,527
    11-10-2005, 12:21 AM Go to last post
  1. 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: 1,082
    10-28-2015, 02:55 PM Go to last post
  2. 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: 1,009
    10-28-2015, 06:59 AM Go to last post
  3. 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: 721
    10-27-2015, 10:37 AM Go to last post
  4. 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: 472
    10-27-2015, 08:56 AM Go to last post
  5. 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: 834
    10-25-2015, 05:01 AM Go to last post
  6. 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: 1,166
    10-20-2015, 01:37 PM Go to last post
  7. 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: 732
    10-20-2015, 01:09 PM Go to last post
  8. 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: 861
    10-19-2015, 08:13 AM Go to last post
  9. 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
    z-score
    • Replies: 0
    • Views: 917
    10-15-2015, 10:14 AM Go to last post
  10. 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: 705
    10-15-2015, 04:16 AM Go to last post
  11. 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: 658
    10-11-2015, 09:22 AM Go to last post
  12. BEST STATISTIC TO USE for TWO STATIC GROUPS?

    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: 906
    10-05-2015, 08:14 PM Go to last post
  13. 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: 981
    10-02-2015, 07:10 PM Go to last post
  14. 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: 535
    10-02-2015, 09:07 AM Go to last post
  15. 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
    cfa
    • Replies: 2
    • Views: 1,017
    10-02-2015, 04:34 AM Go to last post
  16. 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: 1,146
    09-30-2015, 11:38 AM Go to last post
  17. 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: 1,900
    09-30-2015, 10:05 AM Go to last post
  18. 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: 974
    09-28-2015, 12:54 PM Go to last post
  19. 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: 487
    09-27-2015, 08:28 AM Go to last post
  20. 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: 663
    09-26-2015, 02:16 PM Go to last post
  21. 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: 2,524
    09-23-2015, 07:49 AM Go to last post
  22. 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: 750
    09-22-2015, 04:52 AM Go to last post
  23. 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: 972
    09-21-2015, 02:24 PM Go to last post
  24. 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: 807
    09-21-2015, 09:32 AM Go to last post
  25. 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: 900
    09-21-2015, 02:40 AM Go to last post
  26. 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: 761
    09-20-2015, 10:56 AM Go to last post
  27. 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: 1,001
    09-19-2015, 05:01 PM Go to last post
  28. 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: 769
    09-19-2015, 01:25 PM Go to last post
  29. 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: 882
    09-19-2015, 01:03 PM Go to last post
  30. 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: 650
    09-18-2015, 03:47 PM Go to last post
  31. Query on item response theory. Pls help

    When an examination involving 250 multiple choice questions is being evaluated by item response theory , and the candidates ability score is being...

    Started by Pseudomonas‎, 09-13-2015 07:10 AM
    • Replies: 0
    • Views: 696
    09-13-2015, 07:10 AM Go to last post
  32. Detect possible subgroups in sample

    Hi, My data consist of the total scores from a questionnaire (N=700). The distribution is somewhat negatively skewed, however there appears to be...

    Started by nielsl‎, 09-08-2015 02:19 PM
    • Replies: 2
    • Views: 1,064
    09-10-2015, 05:09 AM Go to last post
  33. Psychology textbook error regarding stats?

    Hi all, I'm teaching a community college psychology class this semester out of a new textbook, and the book contains this claim: My first...

    Started by bruin‎, 09-09-2015 03:39 PM
    • Replies: 6
    • Views: 1,256
    09-10-2015, 12:27 AM Go to last post
  34. Sum of Squares

    My homework problem says: For the following summary statistics, find ∑X and SS (sum of squares) a. XBar = 25, s = 10, n = 11 So,I have that...

    Started by JWade‎, 09-07-2015 12:52 PM
    sum of squares
    • Replies: 1
    • Views: 1,488
    09-07-2015, 01:53 PM Go to last post
  35. SEM with categorical variable/parceling/how to enter in AMOS?

    I need to do an SEM and I'm stumped about what to do with one of my variables, which is a nominal categorical variable (previous experience in x vs....

    Started by buntington‎, 04-14-2014 02:56 PM
    3 Pages
    1 2 3
    sem
    • Replies: 32
    • Views: 13,665
    09-07-2015, 06:00 AM Go to last post
  36. Help with the level of measurement for correct/incorrect answers

    Please, help bring in some lucidity and fill in any possible gaps in my reasoning. The research assessed the participants' recall of a narrative...

    Started by Billy the Poet‎, 09-01-2015 06:04 PM
    2 Pages
    1 2
    categorical, dichotomous, level of measurement, logit
    • Replies: 17
    • Views: 4,058
    09-04-2015, 03:27 PM Go to last post
  37. What statistical analysis to use?

    HI, Each of the participants completed 7 tasks. I collected several measures in each task (like answer correctness, perception of difficulty, time...

    Started by Sam31‎, 08-31-2015 11:11 AM
    • Replies: 2
    • Views: 1,202
    09-04-2015, 04:01 AM Go to last post
  38. [R - Lavaan] Which estimator for confirmatory factor analysis?

    Hi, Currently I am using Rstudio with the Lavaan package in order to perform a confirmatory factor analysis (CFA) on a dataset (N = ~ 700, 23...

    Started by nielsl‎, 09-04-2015 01:56 AM
    cfa, lavaan, mardia, multivariate normality, rstudio
    • Replies: 0
    • Views: 755
    09-04-2015, 01:56 AM Go to last post
  39. Forest plot help

    Hello there, I am calculating effect sizes for a forest plot. The RCTs I am using each have several outcome measures (e.g. PARS, SRS, ADIS, MASC,...

    Started by Reda_Johnson‎, 08-28-2015 09:40 AM
    • Replies: 0
    • Views: 1,299
    08-28-2015, 09:40 AM Go to last post
  40. measuring Construct Validity

    Hi! I'm reviewing a psychological assessment battery that is currently under preparation, and am concerned about the method used by the developers to...

    Started by cLEE‎, 08-27-2015 02:05 AM
    • Replies: 2
    • Views: 652
    08-28-2015, 06:55 AM Go to last post
  41. Need help planning analysis of longitudinal survey data

    Hi all, I'm working on a project that is investigating a number of things about art teachers in the years following their completing of a...

    Started by scottwc‎, 08-27-2015 11:48 PM
    • Replies: 1
    • Views: 597
    08-28-2015, 12:03 AM Go to last post
  42. repeated measure with some people quit in mid-way

    Never mind. Got answered from another SPSS forum.

    Started by fengyuwuzu‎, 08-27-2015 03:26 PM
    • Replies: 4
    • Views: 897
    08-27-2015, 06:15 PM Go to last post
  43. Data fit for latent profile analyses?

    I was wondering on how you decide whether data is suitable for latent profile analysis. By that I mean both the assumptions that need to be met, and...

    Started by bramv‎, 08-27-2015 08:55 AM
    latent profile anaysis
    • Replies: 0
    • Views: 743
    08-27-2015, 08:55 AM Go to last post
  44. Repeated Measure ANOVA with muliple samples per participant

    I am currently doing an experiment where I measure the time it takes for a participant to complete a task. There are 7 different modes for the task...

    Started by blooop‎, 08-25-2015 12:35 PM
    anova, repeat measures, spss
    • Replies: 2
    • Views: 669
    08-25-2015, 02:37 PM Go to last post
  45. Compare multiple measures in a one-within dyad design

    Hello everyone, I have a dataset of 50 heterosexual couples, in which the women have a medical condition and the men do not. This suggest that I...

    Started by psantos‎, 08-25-2015 11:39 AM
    • Replies: 0
    • Views: 754
    08-25-2015, 11:39 AM Go to last post
  46. Question Which Statistical method or test to use ?

    Hello, Currently I am pursuing a degree in Psychology through distance mode. I am studying on my own as of now and taking help of internet. The...

    Started by WARLOCK‎, 08-24-2015 02:40 PM
    • Replies: 1
    • Views: 882
    08-25-2015, 02:43 AM Go to last post
  47. Question Grand mean vs meaning individual data points?

    Hello, I'm running an experiment in which I take a measure (reaction time) repeatedly from a human subject. The reaction time is measured at 3...

    Started by bugsbunny‎, 08-21-2015 11:01 AM
    • Replies: 1
    • Views: 1,245
    08-21-2015, 11:04 AM Go to last post
  48. Too few responses to my questionnaire, sample too small for factor analysis?

    Hi there, For my MSc. dissertation, I've administered a questionnaire and only had 69 usable responses. The questionnaire is made up of 6 factors,...

    Started by katie8000‎, 08-09-2015 07:05 AM
    • Replies: 3
    • Views: 1,153
    08-19-2015, 12:44 PM Go to last post
  49. Mediation analysis for two correlated mediators

    Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the...

    Started by Thorstenstats‎, 08-18-2015 10:04 AM
    interaction, mediation, mediation analysis, rstudio, statistic
    • Replies: 2
    • Views: 829
    08-18-2015, 01:47 PM Go to last post
  50. Dealing with a strong ordering effect

    Hello, I'm conducting a study in which people have to judge a perceptual effect (by rating it on a 10 point continous scale). I have three levels...

    Started by masch‎, 08-17-2015 04:00 AM
    experiment analysis, experiment design, order effects, ordering, perception
    • Replies: 0
    • Views: 721
    08-17-2015, 04:00 AM Go to last post
  51. Unequal variance

    I have a within group IV (before and after) and Between group DV (control and experimental) for 25 participants (I had a 40% attrition rate). All of...

    Started by M.Wilson‎, 08-14-2015 06:44 AM
    • Replies: 0
    • Views: 686
    08-14-2015, 06:44 AM Go to last post
  52. When the 3-way interaction is insignificant

    Hi, I have a 3 way-mixed design ANOVA. If the 3-way interaction is insignificant but all the 2-way are, can I still analyze them? If I have some...

    Started by Nko‎, 08-09-2015 03:07 AM
    • Replies: 1
    • Views: 929
    08-09-2015, 05:32 AM Go to last post
  53. Comparing means between sample and subsample

    I would like to compare the mean score on personality questionnaire between my total sample (n=97) and my subsample (n=44) to see if there is a...

    Started by An-KatrienDR‎, 08-05-2015 02:41 AM
    compare means, subsample
    • Replies: 6
    • Views: 2,423
    08-05-2015, 10:50 AM Go to last post
  54. Dichotomizing continuous variables for an EXPERIMENT not a survey

    I am aware of the many issues/pitfalls with splitting continuous variables in survey research. Nothing I have read addresses whether doing so to...

    Started by Curley‎, 06-08-2015 11:50 AM
    binning, dichotomizing variables, experiment design
    • Replies: 13
    • Views: 1,760
    08-04-2015, 05:13 PM Go to last post
  55. Null hypothesis significance testing in psychology research

    Interested in learning more.

    Started by JackB‎, 08-01-2015 04:19 AM
    • Replies: 9
    • Views: 1,612
    08-03-2015, 05:29 PM Go to last post
  56. R2 test with Model II error

    In Jacob Cohen's "Statistical power analysis for the behavioral science" (2nd edition, 1988), page 409, 411-412, it mentions a F test with Model II...

    Started by wangwang‎, 08-02-2015 03:37 PM
    • Replies: 3
    • Views: 496
    08-03-2015, 09:22 AM Go to last post
  57. Factor Analysis Question

    Hi, My research team and I ran two separate confirmatory factor analyses on two separate measures (same participants filled out both self-report...

    Started by Denver‎, 08-03-2015 01:09 AM
    • Replies: 0
    • Views: 889
    08-03-2015, 01:09 AM Go to last post
  58. understanding published results (a median of 0 ???)

    hello everyone, appoligies if this is a strange question but we can not grasp the meaning of the following statement published in an English paper....

    Started by daveroeuk‎, 07-30-2015 08:15 AM
    • Replies: 4
    • Views: 948
    07-30-2015, 10:16 AM Go to last post
  59. New to LCA please help with a methodological question

    Hello, I am new to LCA and attempting to design a secondary data study utilizing LCA as to show latent classes (subtypes) of a specific disorder...

    Started by derekcruise‎, 07-30-2015 01:44 AM
    lca
    • Replies: 0
    • Views: 748
    07-30-2015, 01:44 AM Go to last post
  60. Ordinal or interval survey response analysis (from a convenience sample)

    I have the responses from a survey where people had to provide a rating on a scale from one to five, where five was most positive side of things. I...

    Started by twotone4‎, 07-23-2015 03:35 PM
    convenience, interval, ordinal, standard deviation, survey
    • Replies: 9
    • Views: 1,391
    07-28-2015, 11:02 AM Go to last post

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