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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, 11-09-2005 11:21 PM
    • Replies: 0
    • Views: 16,064
    11-09-2005, 11:21 PM Go to last post
  1. 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: 125
    10-02-2015, 07:10 PM Go to last post
  2. 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: 65
    10-02-2015, 09:07 AM Go to last post
  3. 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: 141
    10-02-2015, 04:34 AM Go to last post
  4. 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: 107
    09-30-2015, 11:38 AM Go to last post
  5. 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: 266
    09-30-2015, 10:05 AM Go to last post
  6. 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: 140
    09-28-2015, 12:54 PM Go to last post
  7. 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: 177
    09-26-2015, 02:16 PM Go to last post
  8. 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: 548
    09-23-2015, 07:49 AM Go to last post
  9. 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: 179
    09-22-2015, 04:52 AM Go to last post
  10. 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: 163
    09-21-2015, 02:24 PM Go to last post
  11. 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: 134
    09-21-2015, 09:32 AM Go to last post
  12. 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: 133
    09-21-2015, 02:40 AM Go to last post
  13. 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: 144
    09-20-2015, 10:56 AM Go to last post
  14. 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: 209
    09-19-2015, 05:01 PM Go to last post
  15. 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: 175
    09-19-2015, 01:25 PM Go to last post
  16. 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: 205
    09-19-2015, 01:03 PM Go to last post
  17. 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: 162
    09-18-2015, 03:47 PM Go to last post
  18. 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: 274
    09-13-2015, 07:10 AM Go to last post
  19. 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: 337
    09-10-2015, 05:09 AM Go to last post
  20. 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: 321
    09-10-2015, 12:27 AM Go to last post
  21. 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: 224
    09-07-2015, 01:53 PM Go to last post
  22. 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
    • Replies: 32
    • Views: 4,845
    09-07-2015, 06:00 AM Go to last post
  23. 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: 748
    09-04-2015, 03:27 PM Go to last post
  24. 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: 318
    09-04-2015, 04:01 AM Go to last post
  25. [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: 155
    09-04-2015, 01:56 AM Go to last post
  26. 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: 306
    08-28-2015, 09:40 AM Go to last post
  27. 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: 189
    08-28-2015, 06:55 AM Go to last post
  28. 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: 169
    08-28-2015, 12:03 AM Go to last post
  29. 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: 256
    08-27-2015, 06:15 PM Go to last post
  30. 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: 185
    08-27-2015, 08:55 AM Go to last post
  31. 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: 319
    08-25-2015, 02:37 PM Go to last post
  32. 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: 155
    08-25-2015, 11:39 AM Go to last post
  33. 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: 303
    08-25-2015, 02:43 AM Go to last post
  34. 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: 257
    08-21-2015, 11:04 AM Go to last post
  35. 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: 495
    08-19-2015, 12:44 PM Go to last post
  36. 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: 235
    08-18-2015, 01:47 PM Go to last post
  37. 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: 239
    08-17-2015, 04:00 AM Go to last post
  38. 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: 288
    08-14-2015, 06:44 AM Go to last post
  39. 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: 220
    08-09-2015, 05:32 AM Go to last post
  40. 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: 272
    08-05-2015, 10:50 AM Go to last post
  41. 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: 809
    08-04-2015, 05:13 PM Go to last post
  42. Null hypothesis significance testing in psychology research

    Interested in learning more.

    Started by JackB‎, 08-01-2015 04:19 AM
    • Replies: 9
    • Views: 439
    08-03-2015, 05:29 PM Go to last post
  43. 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: 217
    08-03-2015, 09:22 AM Go to last post
  44. 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: 165
    08-03-2015, 01:09 AM Go to last post
  45. 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: 316
    07-30-2015, 10:16 AM Go to last post
  46. 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
    • Replies: 0
    • Views: 191
    07-30-2015, 01:44 AM Go to last post
  47. 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: 479
    07-28-2015, 11:02 AM Go to last post
  48. Correct way to treat data for pearson correlation

    Hello everyone I run into the following issue - I had both teachers and pupils rate their beliefs on a likert scale from 1 to 6. I want to check...

    Started by Curious guy‎, 07-27-2015 05:54 AM
    • Replies: 3
    • Views: 223
    07-28-2015, 09:59 AM Go to last post
  49. Likert Scale Data Question

    Hi! I am working with Likert Scale Data (1-5) collected for two different sets of subjects. We have data collected from one school, at two...

    Started by jamesmartinn‎, 07-23-2015 07:22 AM
    • Replies: 2
    • Views: 249
    07-27-2015, 10:24 AM Go to last post
  50. Red face Between Subjects Experimental Design- How to analyse

    I have conducted an experiment with 2 conditions, 50 people in each condition. Each person completed a booklet of tasks and self-report measures (the...

    Started by lc1505‎, 07-27-2015 09:39 AM
    between subjects, between-group differences, experiment, mediation, psychology
    • Replies: 1
    • Views: 179
    07-27-2015, 10:17 AM Go to last post
  51. Types of interactions

    Hi, I am stuggling to find the right words for the statistical terms I would like to look up. Hope, you can help :-) I am looking at a higher...

    Started by liquidmodernity‎, 07-24-2015 06:49 AM
    correlation, higher order construct, interaction
    • Replies: 2
    • Views: 290
    07-27-2015, 08:46 AM Go to last post
  52. Presentation and interpretation of frequency data

    I carried out a study which involved going through a pathological cohort of 97 patient case files retrospectively and rating whether 21 behavioural...

    Started by jen_‎, 07-23-2015 02:24 AM
    • Replies: 2
    • Views: 200
    07-23-2015, 12:27 PM Go to last post
  53. Advice on which statistical test

    Dear Stats Friends I am a UK Clinical Psychology Trainee carrying out a small (5000 words) service improvement project based on where I am on...

    Started by rosenmarsh‎, 07-14-2015 06:19 AM
    • Replies: 8
    • Views: 591
    07-20-2015, 04:13 PM Go to last post
  54. Chi square and player order as a variable

    Hi all, I am getting myself in a muddle trying to use chi square correctly and hoping someone here can help. I am trying to see if there is an...

    Started by crapwithstats‎, 07-16-2015 01:49 AM
    • Replies: 2
    • Views: 416
    07-17-2015, 01:27 AM Go to last post
  55. Interpretation and reporting of dummy variables in causal model (Amos/SEM)

    I am using Amos to conduct SEM. The model I am running has a control variable with several categories for religion. I've used dummy variables to...

    Started by Gia2‎, 07-14-2015 08:24 PM
    • Replies: 3
    • Views: 418
    07-15-2015, 05:54 PM Go to last post
  56. 2 x 3 (Repeated Measures?) ANOVA

    Hi guys! I would be very grateful if someone could just doublecheck my choice of data analysis. This is for a dissertation, and I do not have the...

    Started by somethingwithchocolate‎, 07-14-2015 05:58 AM
    2x3 design, repeated measures anova
    • Replies: 0
    • Views: 241
    07-14-2015, 05:58 AM Go to last post
  57. Help with interpretation

    Hi All, Here is what i need help with. I am working with small sample size and this is the result so far. X and Y are not correlated ; however,...

    Started by arps‎, 07-12-2015 06:22 AM
    correlation, multiple regression
    • Replies: 4
    • Views: 387
    07-13-2015, 11:08 AM Go to last post
  58. Comparing two groups with two data sets? Is multiple regression test conveniant

    Hi I was wondering if someone could direct me to the right area.. I have currently done my research, where I wanted to find out the causal...

    Started by fifa786‎, 07-12-2015 10:03 PM
    • Replies: 0
    • Views: 225
    07-12-2015, 10:03 PM Go to last post
  59. Comparing three percentages (not means) which test [spss]

    Hello I wonder if you can help I am having trouble working out which statistical test to use. I have conducted a TMS study with four participants....

    Started by AbbyBradWest‎, 07-11-2015 06:46 AM
    • Replies: 0
    • Views: 220
    07-11-2015, 06:46 AM Go to last post
  60. Chi Square and Effect Size - Too easy to manipulate data?

    Hello everyone, I have several statistics textbook at home and consulted multiple online sources but have not found an answer to this. First -...

    Started by vasso‎, 07-06-2015 08:46 AM
    • Replies: 8
    • Views: 637
    07-10-2015, 04:23 PM Go to last post

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