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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: 32,186
    11-10-2005, 12:21 AM Go to last post
  1. 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: 1,276
    09-21-2015, 09:32 AM Go to last post
  2. 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: 1,530
    09-21-2015, 02:40 AM Go to last post
  3. 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: 1,246
    09-20-2015, 10:56 AM Go to last post
  4. 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: 1,562
    09-19-2015, 05:01 PM Go to last post
  5. 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: 1,055
    09-19-2015, 01:25 PM Go to last post
  6. 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: 1,418
    09-19-2015, 01:03 PM Go to last post
  7. 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: 1,112
    09-18-2015, 03:47 PM Go to last post
  8. 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: 1,172
    09-13-2015, 07:10 AM Go to last post
  9. 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: 1,543
    09-10-2015, 05:09 AM Go to last post
  10. 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: 1,834
    09-10-2015, 12:27 AM Go to last post
  11. 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: 2,567
    09-07-2015, 01:53 PM Go to last post
  12. 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: 19,614
    09-07-2015, 06:00 AM Go to last post
  13. 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: 8,535
    09-04-2015, 03:27 PM Go to last post
  14. 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: 1,953
    09-04-2015, 04:01 AM Go to last post
  15. [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: 1,324
    09-04-2015, 01:56 AM Go to last post
  16. 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: 2,026
    08-28-2015, 09:40 AM Go to last post
  17. 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: 1,037
    08-28-2015, 06:55 AM Go to last post
  18. 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: 967
    08-28-2015, 12:03 AM Go to last post
  19. 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: 1,998
    08-27-2015, 06:15 PM Go to last post
  20. 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: 1,169
    08-27-2015, 08:55 AM Go to last post
  21. 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: 957
    08-25-2015, 02:37 PM Go to last post
  22. 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: 1,604
    08-25-2015, 11:39 AM Go to last post
  23. 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: 1,309
    08-25-2015, 02:43 AM Go to last post
  24. 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: 2,031
    08-21-2015, 11:04 AM Go to last post
  25. 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: 1,734
    08-19-2015, 12:44 PM Go to last post
  26. 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: 1,700
    08-18-2015, 01:47 PM Go to last post
  27. 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: 1,126
    08-17-2015, 04:00 AM Go to last post
  28. 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: 1,046
    08-14-2015, 06:44 AM Go to last post
  29. 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: 1,622
    08-09-2015, 05:32 AM Go to last post
  30. 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: 4,533
    08-05-2015, 10:50 AM Go to last post
  31. 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: 2,359
    08-04-2015, 05:13 PM Go to last post
  32. Null hypothesis significance testing in psychology research

    Interested in learning more.

    Started by JackB‎, 08-01-2015 04:19 AM
    • Replies: 9
    • Views: 2,060
    08-03-2015, 05:29 PM Go to last post
  33. 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: 695
    08-03-2015, 09:22 AM Go to last post
  34. 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: 1,381
    08-03-2015, 01:09 AM Go to last post
  35. 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: 1,627
    07-30-2015, 10:16 AM Go to last post
  36. 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: 1,300
    07-30-2015, 01:44 AM Go to last post
  37. 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: 2,741
    07-28-2015, 11:02 AM Go to last post
  38. 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: 1,695
    07-28-2015, 09:59 AM Go to last post
  39. 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: 2,656
    07-27-2015, 10:24 AM Go to last post
  40. 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: 1,121
    07-27-2015, 10:17 AM Go to last post
  41. 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: 1,323
    07-27-2015, 08:46 AM Go to last post
  42. 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: 1,027
    07-23-2015, 12:27 PM Go to last post
  43. 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: 1,689
    07-20-2015, 04:13 PM Go to last post
  44. 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: 1,338
    07-17-2015, 01:27 AM Go to last post
  45. 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: 1,889
    07-15-2015, 05:54 PM Go to last post
  46. 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: 1,194
    07-14-2015, 05:58 AM Go to last post
  47. 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: 2,152
    07-13-2015, 11:08 AM Go to last post
  48. 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: 1,090
    07-12-2015, 10:03 PM Go to last post
  49. 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: 1,155
    07-11-2015, 06:46 AM Go to last post
  50. 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: 2,075
    07-10-2015, 04:23 PM Go to last post
  51. 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 10:20 AM
    • Replies: 0
    • Views: 1,298
    07-07-2015, 10:20 AM Go to last post
  52. 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 06:37 AM
    • Replies: 1
    • Views: 1,509
    07-03-2015, 08:57 AM Go to last post
  53. 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 09:59 AM
    • Replies: 3
    • Views: 1,605
    07-02-2015, 10:16 AM Go to last post
  54. 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 01:47 PM
    • Replies: 10
    • Views: 3,635
    07-01-2015, 12:12 PM Go to last post
  55. 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 05:16 PM
    issue., normality
    • Replies: 3
    • Views: 1,753
    06-29-2015, 06:32 PM Go to last post
  56. 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 07:59 PM
    binomial data, educational measurement, welch's t-test
    • Replies: 3
    • Views: 2,715
    06-29-2015, 10:02 AM Go to last post
  57. 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 09:19 AM
    anova, mixed design, post hoc tests, reporting results
    • Replies: 0
    • Views: 1,222
    06-29-2015, 09:19 AM Go to last post
  58. 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 04:36 PM
    • Replies: 1
    • Views: 1,169
    06-28-2015, 02:28 AM Go to last post
  59. 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 11:04 AM
    • Replies: 0
    • Views: 1,297
    06-27-2015, 11:04 AM Go to last post
  60. SEM modelers and R users: lavaan, sem or OpenMX?

    hey out there to all SEM and R users... just wanted to conduct a quick, informal poll about which R package do people consider is the best suited to...

    Started by spunky‎, 01-23-2012 05:38 PM
    • Replies: 10
    • Views: 13,659
    06-26-2015, 09:08 AM Go to last post

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