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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: 21,875
    11-10-2005, 12:21 AM Go to last post
  1. 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 03:04 PM
    • Replies: 1
    • Views: 576
    09-21-2015, 03:24 PM Go to last post
  2. 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 10:32 AM
    • Replies: 0
    • Views: 428
    09-21-2015, 10:32 AM Go to last post
  3. 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 09:54 PM
    calculating correlation, partial correlation
    • Replies: 1
    • Views: 579
    09-21-2015, 03:40 AM Go to last post
  4. 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 11:56 AM
    • Replies: 0
    • Views: 437
    09-20-2015, 11:56 AM Go to last post
  5. 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 05:08 AM
    likert, negative skew, transformation
    • Replies: 4
    • Views: 586
    09-19-2015, 06:01 PM Go to last post
  6. 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 01:18 PM
    • Replies: 1
    • Views: 576
    09-19-2015, 02:25 PM Go to last post
  7. 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 10:07 PM
    anova, categorical covariate, data analysis, repeated measures
    • Replies: 4
    • Views: 543
    09-19-2015, 02:03 PM Go to last post
  8. 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 04:47 PM
    anova, one-way anova, repeated measures, within-subjects
    • Replies: 0
    • Views: 463
    09-18-2015, 04:47 PM Go to last post
  9. 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 08:10 AM
    • Replies: 0
    • Views: 524
    09-13-2015, 08:10 AM Go to last post
  10. 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 03:19 PM
    • Replies: 2
    • Views: 673
    09-10-2015, 06:09 AM Go to last post
  11. 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 04:39 PM
    • Replies: 6
    • Views: 863
    09-10-2015, 01:27 AM Go to last post
  12. 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 01:52 PM
    sum of squares
    • Replies: 1
    • Views: 611
    09-07-2015, 02:53 PM Go to last post
  13. 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 03:56 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 9,253
    09-07-2015, 07:00 AM Go to last post
  14. 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 07:04 PM
    2 Pages
    1 2
    categorical, dichotomous, level of measurement, logit
    • Replies: 17
    • Views: 2,396
    09-04-2015, 04:27 PM Go to last post
  15. 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 12:11 PM
    • Replies: 2
    • Views: 717
    09-04-2015, 05:01 AM Go to last post
  16. [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 02:56 AM
    cfa, lavaan, mardia, multivariate normality, rstudio
    • Replies: 0
    • Views: 457
    09-04-2015, 02:56 AM Go to last post
  17. 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 10:40 AM
    • Replies: 0
    • Views: 686
    08-28-2015, 10:40 AM Go to last post
  18. 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 03:05 AM
    • Replies: 2
    • Views: 481
    08-28-2015, 07:55 AM Go to last post
  19. 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, 08-28-2015 12:48 AM
    • Replies: 1
    • Views: 423
    08-28-2015, 01:03 AM Go to last post
  20. repeated measure with some people quit in mid-way

    Never mind. Got answered from another SPSS forum.

    Started by fengyuwuzu‎, 08-27-2015 04:26 PM
    • Replies: 4
    • Views: 638
    08-27-2015, 07:15 PM Go to last post
  21. 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 09:55 AM
    latent profile anaysis
    • Replies: 0
    • Views: 440
    08-27-2015, 09:55 AM Go to last post
  22. 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 01:35 PM
    anova, repeat measures, spss
    • Replies: 2
    • Views: 535
    08-25-2015, 03:37 PM Go to last post
  23. 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 12:39 PM
    • Replies: 0
    • Views: 407
    08-25-2015, 12:39 PM Go to last post
  24. 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 03:40 PM
    • Replies: 1
    • Views: 658
    08-25-2015, 03:43 AM Go to last post
  25. 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 12:01 PM
    • Replies: 1
    • Views: 587
    08-21-2015, 12:04 PM Go to last post
  26. 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 08:05 AM
    • Replies: 3
    • Views: 772
    08-19-2015, 01:44 PM Go to last post
  27. 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 11:04 AM
    interaction, mediation, mediation analysis, rstudio, statistic
    • Replies: 2
    • Views: 554
    08-18-2015, 02:47 PM Go to last post
  28. 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 05:00 AM
    experiment analysis, experiment design, order effects, ordering, perception
    • Replies: 0
    • Views: 494
    08-17-2015, 05:00 AM Go to last post
  29. 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 07:44 AM
    • Replies: 0
    • Views: 516
    08-14-2015, 07:44 AM Go to last post
  30. 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 04:07 AM
    • Replies: 1
    • Views: 483
    08-09-2015, 06:32 AM Go to last post
  31. 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 03:41 AM
    compare means, subsample
    • Replies: 6
    • Views: 1,228
    08-05-2015, 11:50 AM Go to last post
  32. 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 12:50 PM
    binning, dichotomizing variables, experiment design
    • Replies: 13
    • Views: 1,400
    08-04-2015, 06:13 PM Go to last post
  33. Null hypothesis significance testing in psychology research

    Interested in learning more.

    Started by JackB‎, 08-01-2015 05:19 AM
    • Replies: 9
    • Views: 1,237
    08-03-2015, 06:29 PM Go to last post
  34. 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 04:37 PM
    • Replies: 3
    • Views: 421
    08-03-2015, 10:22 AM Go to last post
  35. 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 02:09 AM
    • Replies: 0
    • Views: 392
    08-03-2015, 02:09 AM Go to last post
  36. 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 09:15 AM
    • Replies: 4
    • Views: 606
    07-30-2015, 11:16 AM Go to last post
  37. 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 02:44 AM
    • Replies: 0
    • Views: 439
    07-30-2015, 02:44 AM Go to last post
  38. 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 04:35 PM
    convenience, interval, ordinal, standard deviation, survey
    • Replies: 9
    • Views: 852
    07-28-2015, 12:02 PM Go to last post
  39. 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 06:54 AM
    • Replies: 3
    • Views: 536
    07-28-2015, 10:59 AM Go to last post
  40. 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 08:22 AM
    • Replies: 2
    • Views: 660
    07-27-2015, 11:24 AM Go to last post
  41. 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 10:39 AM
    between subjects, between-group differences, experiment, mediation, psychology
    • Replies: 1
    • Views: 444
    07-27-2015, 11:17 AM Go to last post
  42. 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 07:49 AM
    correlation, higher order construct, interaction
    • Replies: 2
    • Views: 618
    07-27-2015, 09:46 AM Go to last post
  43. 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 03:24 AM
    • Replies: 2
    • Views: 421
    07-23-2015, 01:27 PM Go to last post
  44. 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 07:19 AM
    • Replies: 8
    • Views: 1,000
    07-20-2015, 05:13 PM Go to last post
  45. 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 02:49 AM
    • Replies: 2
    • Views: 728
    07-17-2015, 02:27 AM Go to last post
  46. 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 09:24 PM
    • Replies: 3
    • Views: 716
    07-15-2015, 06:54 PM Go to last post
  47. 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 06:58 AM
    2x3 design, repeated measures anova
    • Replies: 0
    • Views: 520
    07-14-2015, 06:58 AM Go to last post
  48. 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 07:22 AM
    correlation, multiple regression
    • Replies: 4
    • Views: 682
    07-13-2015, 12:08 PM Go to last post
  49. 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 11:03 PM
    • Replies: 0
    • Views: 430
    07-12-2015, 11:03 PM Go to last post
  50. 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 07:46 AM
    • Replies: 0
    • Views: 456
    07-11-2015, 07:46 AM Go to last post
  51. 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 09:46 AM
    • Replies: 8
    • Views: 1,226
    07-10-2015, 05:23 PM Go to last post
  52. 5 Factor Personality Traits and Employee Engagement

    Hello, I have just graduated, interning at a company and have been asked to find out what type of personalities we have here, and the relationship it...

    Started by thedonone‎, 07-07-2015 11:20 AM
    • Replies: 0
    • Views: 470
    07-07-2015, 11:20 AM Go to last post
  53. differences between different levels of ordinal variables (repeated measures)

    Hi all, I'm writing my thesis at the moment and I've come across a problem that I'm not sure how to solve. Maybe i'm just too focussed on it to...

    Started by nickdrenth1‎, 07-03-2015 07:37 AM
    • Replies: 1
    • Views: 587
    07-03-2015, 09:57 AM Go to last post
  54. imputation on ordinal varibales (likert scale) missing values

    We have some survey data, and some questions were left answered. When I tried to do multiple imputation, I got the message: The imputation model...

    Started by fengyuwuzu‎, 07-01-2015 10:59 AM
    • Replies: 3
    • Views: 844
    07-02-2015, 11:16 AM Go to last post
  55. Big Data

    In a surveillance society, are there now computer-aided methods way more sophisticated than Factor Analysis such that no piece of info about any...

    Started by Outlier‎, 06-14-2015 02:47 PM
    • Replies: 10
    • Views: 1,788
    07-01-2015, 01:12 PM Go to last post
  56. normality problem

    I have 15 dependent variables on on IQ measure am using in my study but after checking for skewness and kurtosis two of them are not normally...

    Started by miezahdaniel‎, 06-29-2015 06:16 PM
    issue., normality
    • Replies: 3
    • Views: 662
    06-29-2015, 07:32 PM Go to last post
  57. comparing two independent binomial data sets, unequal size, Welchs t-test?

    I would like to compare the pass rates of two different classes (say English 111 and English 113). The data is binomial (0= fail, 1=pass). The sets...

    Started by thankyou‎, 06-27-2015 08:59 PM
    binomial data, educational measurement, welch's t-test
    • Replies: 3
    • Views: 910
    06-29-2015, 11:02 AM Go to last post
  58. HELP! 4x2 Mixed Design ANOVA Post Hoc Tests

    Hi all, I'm a PhD student and for my most recent study I conducted a 4 (experimental condition) x 2 (emotion type) mixed design ANOVA with...

    Started by nerdlynoel‎, 06-29-2015 10:19 AM
    anova, mixed design, post hoc tests, reporting results
    • Replies: 0
    • Views: 496
    06-29-2015, 10:19 AM Go to last post
  59. dependence of measures

    What to do with lack of independence in measures? What would you do if there's a correlation among measures? I am comparing a group of 20...

    Started by Mriazi‎, 06-27-2015 05:36 PM
    • Replies: 1
    • Views: 430
    06-28-2015, 03:28 AM Go to last post
  60. grouping participants together to form 1 group

    Hi sorry for the silly question:shakehead but I need some help I have 3 groups of participants in groups A, B and C but due to the small population...

    Started by cindz‎, 06-27-2015 12:04 PM
    • Replies: 0
    • Views: 429
    06-27-2015, 12:04 PM Go to last post

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