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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: 30,839
    11-10-2005, 12:21 AM Go to last post
  1. Cohen's Kappa - I have a variable number of codes per unit of text

    Hi all, I have a question about Cohen's Kappa that have been puzzled about for a long time - it comes up all the time for me, almost every single...

    Started by vonkorff‎, 11-11-2014 03:16 PM
    • Replies: 0
    • Views: 1,289
    11-11-2014, 03:16 PM Go to last post
  2. Question about contrast coefficients in split plot ANOVA

    I had a statistical question regarding specific contrasts for a mixed ANOVA that I am running (Cond is a between subjects factor and Time is a within...

    Started by petervenkmanjr‎, 09-19-2012 01:11 PM
    • Replies: 1
    • Views: 2,308
    11-10-2014, 07:04 PM Go to last post
  3. How to test Accuracy significantly different from chance?

    Hi All, So I have more than 60 subjects who participated in an experiment. I would like to exclude those who performed at chance level. The...

    Started by ilaria‎, 11-10-2014 01:14 PM
    chance level, performance, significance test
    • Replies: 4
    • Views: 1,862
    11-10-2014, 04:17 PM Go to last post
  4. Icc

    Hi! I'm interested in using an Intraclass Correlation Coefficient to answer some questions about a project. I'm wondering if someone can advise on...

    Started by jamesmartinn‎, 11-05-2014 01:19 PM
    • Replies: 2
    • Views: 1,654
    11-10-2014, 08:45 AM Go to last post
  5. HELP effect size and z value

    Hey there, for non-parametric tests, what exactly is the Z value(I've heard different reasons one being to do with probabilities...). Do you have...

    Started by Rupert93‎, 11-08-2014 02:54 PM
    • Replies: 2
    • Views: 1,927
    11-08-2014, 05:33 PM Go to last post
  6. Question Need help Identifying the method to Analyze my data & assumption tests

    Any and all help would be much appreciated! I've detailed a bit of information below, but if I left anything out please let me know My hypotheses...

    Started by ztable‎, 11-08-2014 02:37 PM
    • Replies: 0
    • Views: 1,553
    11-08-2014, 02:37 PM Go to last post
  7. Comparsion grouped data (binary)

    Hello people! I have a simple question.. I want to compare grouped data that have a binary outcome (I hope I say this right..). Explanation: My...

    Started by tartufo‎, 11-06-2014 05:22 PM
    • Replies: 0
    • Views: 1,433
    11-06-2014, 05:22 PM Go to last post
  8. Exclamation Systematic way to find cases with random answers in a survey data set

    Hi everyone ! I'm new to the forums and I am a first year PhD student. We just collected data with a survey the research team I work on...

    Started by pvincentruz‎, 11-06-2014 10:53 AM
    random answers, survey
    • Replies: 3
    • Views: 1,396
    11-06-2014, 12:20 PM Go to last post
  9. Lightbulb Can I still incorporate excluded cases in some analyses?

    Hi again! In our study we want to exclude subject with a schizotypal personality disorder as well as possible without needing to do any clinical...

    Started by Saluience‎, 11-04-2014 06:02 AM
    cut-off
    • Replies: 3
    • Views: 1,291
    11-06-2014, 12:08 PM Go to last post
  10. Lightbulb Hypothesis: High levels of variable X+Y predict Z better than X/Y alone

    I'm working on a paper for school about mindfulness and have found this in the literature: A sample of mindfulness practitioners was analyzed to...

    Started by Inferknite‎, 11-05-2014 07:21 PM
    • Replies: 3
    • Views: 2,755
    11-06-2014, 11:59 AM Go to last post
  11. Reporting ANOVA & Kruskal-wallis in one table

    Hello, I have been trying to get to the bottom of this and it seems rather inconsistent across papers, so perhaps someone could help... I'm...

    Started by flapjacj2000‎, 11-05-2014 08:47 PM
    • Replies: 0
    • Views: 2,202
    11-05-2014, 08:47 PM Go to last post
  12. Work absence prediction

    Hi I want to make a model to predict sickness rate (as a percentage of total number of employees) based on weekday/month/age/job/shift/length of...

    Started by davidman‎, 11-05-2014 07:31 PM
    • Replies: 0
    • Views: 1,438
    11-05-2014, 07:31 PM Go to last post
  13. Item response theory - 3PL and multidimensional models

    I am interested in understanding whether there may be a relationship between a 3PL IRT model and multidimensional IRT models. Here is an explanation...

    Started by nicnic‎, 11-04-2014 05:37 PM
    • Replies: 5
    • Views: 1,451
    11-05-2014, 01:21 AM Go to last post
  14. Paired Samples T test or Repeated Measures ANOVA?

    Hi everyone, I am on a tight deadline and could use some input on my proposed analyses for my project. PROJECT: I am administering a novel...

    Started by jmmu‎, 10-18-2014 03:30 PM
    paired samples t-test, pre-post, repeated measure anova
    • Replies: 1
    • Views: 1,942
    11-04-2014, 07:10 PM Go to last post
  15. Developmental Psychology Stats

    Hello, I'm struggling coming up for stats for my study..my teacher is telling me to do non-parametric tests e.g. a wilcoxin and Man-witney U. It's on...

    Started by Rupert93‎, 11-04-2014 08:03 AM
    • Replies: 0
    • Views: 1,131
    11-04-2014, 08:03 AM Go to last post
  16. Question Scale-wise testing for "missing completely at random"?

    Hi there! :) I want to impute my missing data by using maximal likelihood (ML) estimation in SPSS. I've read that concerning questionnaire data...

    Started by Saluience‎, 11-04-2014 05:52 AM
    little's mcar, mcar, missing, missing data, missing value analysis
    • Replies: 1
    • Views: 1,359
    11-04-2014, 06:03 AM Go to last post
  17. Sample Size for Prevalence Study

    Hi All, I was hoping to get some advice on how to use the following formula to estimate sample size for a prevalence study (paper with exact...

    Started by bozatron‎, 10-27-2014 03:12 AM
    sample size
    • Replies: 4
    • Views: 7,773
    11-03-2014, 10:14 AM Go to last post
  18. Moderation in Repeated Measures ANOVA?

    Hi all, My study is looking at the influence of 3 different training types on performance (so I have 3 conditions). Participants were tested at 4...

    Started by RER31‎, 11-02-2014 03:02 PM
    • Replies: 3
    • Views: 2,227
    11-02-2014, 05:25 PM Go to last post
  19. comparing statistical distributions and identifying differences

    Hello! I am doing an experiment which involves measuring a property of around 5000 proteins. The observation is a ratio which will be between...

    Started by raju.adduri‎, 10-31-2014 07:30 AM
    • Replies: 2
    • Views: 1,352
    11-01-2014, 07:28 AM Go to last post
  20. Measure of overlap between two sets of ratings (Mahalanobis?)

    Hi all, I would like to compute a measure of overlap between two sets of ratings made by the same individual. To illustrate, let’s assume the...

    Started by Kalle‎, 10-30-2014 09:53 AM
    • Replies: 2
    • Views: 1,587
    10-31-2014, 08:49 AM Go to last post
  21. Test-Retest Reliability Coefficient

    Hi Folks, Hopefully this is a relatively easy question. I collected data on a measure at two time points, and I would like to run a test-retest...

    Started by herwitz‎, 07-22-2014 08:35 AM
    cohen's kappa, test-retest
    • Replies: 8
    • Views: 3,639
    10-30-2014, 08:56 AM Go to last post
  22. Do clothes or underwear express character?

    Background I am a university level psychologists-come-English-conversation teacher, that directs student psychology even though I don't have much...

    Started by timtak‎, 10-23-2014 03:10 AM
    correlation, pearson's r
    • Replies: 4
    • Views: 1,702
    10-23-2014, 09:21 AM Go to last post
  23. Mixed-effects logistic regression model for a 10-step continuum

    Hello, I am trying understand how to correctly build a mixed-effects logistic regression model in R. I believe my model is pretty simple and...

    Started by statfail‎, 10-22-2014 11:09 PM
    logistic regression, mixed-effects, psychology
    • Replies: 0
    • Views: 1,131
    10-22-2014, 11:09 PM Go to last post
  24. Question: what statistical test to use to measure cooperation (prisoner's dilemma)

    Hi. I'm an undergraduate student and I've designed an experiment for one of my capstone courses, but I'm not sure quite how to analyze the...

    Started by cds08097‎, 10-22-2014 12:05 PM
    chi squared, cooperation, language, prisoners dilemma
    • Replies: 0
    • Views: 2,356
    10-22-2014, 12:05 PM Go to last post
  25. Categorical data analysis for within subjects design

    Hi, I hope someone here would be able to help. I conducted an experiment with within subjects design with 2 independent categorical variables...

    Started by AJ0‎, 10-22-2014 10:50 AM
    • Replies: 0
    • Views: 2,150
    10-22-2014, 10:50 AM Go to last post
  26. Error Simulation Curves - Non-metric MDS

    Hi Can anybody give any hint about how to make the simulation curves of error for different dimensionalities in non-metric multidimensional...

    Started by MDSnewbie‎, 10-21-2014 10:22 AM
    • Replies: 0
    • Views: 909
    10-21-2014, 10:22 AM Go to last post
  27. Is biological disposition an Independent Variable? What do you think?

    I've been asked to look at the relationship between child attachment in the first year of life and problem behavior at age 10. Also, whether gender...

    Started by roganjosh27‎, 10-21-2014 03:11 AM
    biology, independ variable, independent variable
    • Replies: 1
    • Views: 1,422
    10-21-2014, 06:49 AM Go to last post
  28. Ancova?

    Hi, I would like to determine whether the frequency of a specific word category differs between participants’ oral and written texts, at two...

    Started by Ajna‎, 10-15-2014 06:22 AM
    • Replies: 5
    • Views: 1,856
    10-18-2014, 06:29 AM Go to last post
  29. T tests vs two way ANOVA?

    You have a quantitative variable (for example general intelligence) and you also have two categorical variables, each of them with two levels, for...

    Started by dmon‎, 10-18-2014 12:57 AM
    • Replies: 1
    • Views: 1,241
    10-18-2014, 03:02 AM Go to last post
  30. Talking 3 variables are normally distributed - 1 is not - how to transform

    Hi, I have not done transformations before but need to do now. One of my 4 variables is skewed (skewness statistic/skewness stardard error =...

    Started by Helen53‎, 10-15-2014 03:34 AM
    • Replies: 4
    • Views: 1,861
    10-15-2014, 07:53 AM Go to last post
  31. Comparing pre and post questionnaire percentages

    Hello, I was hoping for some help with the following few questions which I will elaborate more on below. 1) How similar does a sample need to...

    Started by Callum‎, 10-14-2014 10:37 AM
    • Replies: 4
    • Views: 2,004
    10-15-2014, 04:53 AM Go to last post
  32. Help on our research

    Please help me determine what statistics should we use IV= Dimple Placement/location, 6 kinds of dimple placement EXAMPLE PIC of our...

    Started by ccamiile13‎, 10-14-2014 07:39 AM
    help please, spss, statistical test, test statistic equation
    • Replies: 0
    • Views: 1,485
    10-14-2014, 07:39 AM Go to last post
  33. Regarding Cohen's d use...

    Hi, I am confused regarding added value of Cohen's d. Consider a case of paired t-test. I calculate the Cohen's d as: mean(vec1) - mean(vec2)) /...

    Started by john.gelburg‎, 10-12-2014 05:27 AM
    cohen's d
    • Replies: 2
    • Views: 1,506
    10-12-2014, 02:51 PM Go to last post
  34. Partial spearman correlations and normality

    hello I am trying to conduct partial spearman rho correlations with syntax. However, I have different controls for my different variables. For...

    Started by loren27‎, 10-12-2014 07:50 AM
    normality, partial spearman, sample size
    • Replies: 1
    • Views: 1,440
    10-12-2014, 11:09 AM Go to last post
  35. Item Response Theory vs Confirmatory Factor Analysis

    Hi all, I was wondering what the core, meaningful differences are between Item Response Theory and Confirmatory Factor Analysis. I understand...

    Started by SimonSchus‎, 10-07-2014 09:00 AM
    cfa, irt, philosophy
    • Replies: 5
    • Views: 5,037
    10-08-2014, 03:48 PM Go to last post
  36. Reverse Scored Items

    I am working on a survey and have included several reverse scored items. I am wondering though if reverse scored items buy anything? Do they...

    Started by trinker‎, 10-08-2014 08:33 AM
    • Replies: 1
    • Views: 1,860
    10-08-2014, 09:15 AM Go to last post
  37. MDS configuration Stress-1 acceptable value

    Hi I'm trying to do the MDS config. for ACS scale (20 items). I used ordinal model (Proxscal-spss) with primary approach (untied tied...

    Started by MDSnewbie‎, 10-08-2014 08:09 AM
    acceptable, mds, stress-1, values
    • Replies: 0
    • Views: 1,902
    10-08-2014, 08:09 AM Go to last post
  38. Unhappy non-significant multivariate BUT significant univariate. What to do?

    Hello, I need some urgent help with the following problem. I ran a MANCOVA but the multivariate test (Pillai's trace, wilk's lambda and...

    Started by chatlanid‎, 10-07-2014 12:50 PM
    • Replies: 2
    • Views: 1,790
    10-07-2014, 04:43 PM Go to last post
  39. Mann-Whitney test -- Large U values

    Hello, I've recently conducted numerous mann-whitney tests and all of the U values appear to be around 15,000 to 20,000. My n's vary between...

    Started by Templean‎, 10-02-2014 12:24 PM
    • Replies: 1
    • Views: 1,390
    10-06-2014, 07:54 PM Go to last post
  40. Angry Dealing with missing data in Repeated-measures ANOVAs

    Afternoon all, I've been running a longitudinal follow-up study to assess outcomes following a psychological treatment for ME. As to be expected,...

    Started by kal26‎, 10-02-2014 10:31 AM
    anovas, missing data, repeated measures
    • Replies: 3
    • Views: 1,435
    10-05-2014, 11:51 PM Go to last post
  41. Comparing within-group and outside-group

    Hi All, I want to compare results within a group to see if they are more closely related than random comparisons*. I'm really not sure the best...

    Started by Rob1983‎, 09-30-2014 04:38 AM
    • Replies: 2
    • Views: 1,109
    09-30-2014, 07:13 AM Go to last post
  42. Parametric vs. Non-parametric tests - what should I present?

    Hi everyone! I would like to have your opinion on this matter. I conducted both parametric and non-parametric MANOVAS for my master's...

    Started by arlp‎, 09-22-2014 12:16 PM
    • Replies: 5
    • Views: 1,927
    09-27-2014, 12:33 PM Go to last post
  43. Question Comparing two genetic models

    Hi there, I have a question about how to compare two models within SPSS. My problem: I have data acquired for let's say 100 people. My...

    Started by Xeno‎, 09-25-2014 07:47 AM
    • Replies: 4
    • Views: 1,613
    09-26-2014, 04:09 AM Go to last post
  44. G Theory / Variance Components problems

    I'm running SPSS Variance Components analyses using REML estimation. I have both real and fictitious data in which employees are rated by multiple...

    Started by Uwyze‎, 09-25-2014 10:33 AM
    • Replies: 9
    • Views: 3,008
    09-25-2014, 12:55 PM Go to last post
  45. Question Is a factor analysis possible on aggregated survey data?

    Hi, All, so I've been asked to help with an analysis and it's not as straightforward as I thought it would be. Background: The company gives...

    Started by SabbyATL‎, 09-25-2014 12:47 PM
    • Replies: 0
    • Views: 1,078
    09-25-2014, 12:47 PM Go to last post
  46. SEM - Comparing Models with Different Variables

    I am doing some structural equation modeling. I have made one model with 3 exogenous variables predicting 5 endogenous variables and would like to...

    Started by xralphyx‎, 01-31-2013 10:55 AM
    2 Pages
    1 2
    sem fit indices ecvi
    • Replies: 20
    • Views: 9,106
    09-23-2014, 06:58 PM Go to last post
  47. Mixed Design ANOVA (2 x 2 x 3) - Partial Eta Squared?

    I'm so confused! I have completed my thesis, and am being asked to provide the partial eta squared values for the mixed-design ANOVA I performed...

    Started by mackerbuddy‎, 09-22-2014 11:04 PM
    • Replies: 1
    • Views: 1,848
    09-23-2014, 06:47 AM Go to last post
  48. What test should I run? Repeated measures manova?

    Hello, I'm interested in determining if significant differences exist among consumers' perceptions of their two favorite restaurants on 4...

    Started by ColdPillow‎, 09-18-2014 10:09 AM
    • Replies: 1
    • Views: 1,507
    09-22-2014, 11:21 AM Go to last post
  49. Latent Growth Curve and covariates

    I'm examining latent growth curves in Mplus. My dependent variable is continuous, measured over three time points. I have a great unconditional...

    Started by reisareno‎, 09-20-2014 09:52 PM
    aic, bic, latent growth curve, mplus
    • Replies: 0
    • Views: 1,004
    09-20-2014, 09:52 PM Go to last post
  50. Advice on linear regression analysis

    Hi! For my dissertation, I'm conducting a research in which I'm exploring the role of some psychosocial variables (i.e. mindfulness, automatic...

    Started by arlp‎, 09-17-2014 12:26 PM
    • Replies: 5
    • Views: 1,781
    09-19-2014, 09:23 AM Go to last post
  51. Running non-parametric repeated measures analysis with split file on

    Okay so, I'm currently writing up my thesis, and I've got 2 between group variables and 3 within-group variables. I'm not doing a mixed design...

    Started by Mimi‎, 09-18-2014 08:29 AM
    friedman test, help me!, non-parameteric, split-file, spss
    • Replies: 0
    • Views: 1,483
    09-18-2014, 08:29 AM Go to last post
  52. sample size in a mixed ANOVA

    I'd like to calculate my sample size for a mixed ANOVA. I have 2 groups in my experiment and within groups I have 3 variables. the first variable has...

    Started by kata‎, 09-18-2014 05:34 AM
    • Replies: 0
    • Views: 1,850
    09-18-2014, 05:34 AM Go to last post
  53. Outliers question for repeated measures anova

    Hi, I just wanted some confirmation because I cannot seem to find a clear answer in any textbook yet. When running a repeated measures anova...

    Started by a.jerovich‎, 09-15-2014 12:10 AM
    • Replies: 0
    • Views: 1,694
    09-15-2014, 12:10 AM Go to last post
  54. decision making

    is decision making related to psychology???

    Started by haraharae‎, 09-12-2014 12:47 PM
    • Replies: 2
    • Views: 2,008
    09-12-2014, 01:53 PM Go to last post
  55. RMSEA impacted by high reliability scores..

    Hello again Sorry - In relation to running Confirmatory Factor Analysis - I'm wondering whether someone is aware of RMSEA being impacted by...

    Started by anon2000‎, 09-11-2014 03:07 AM
    cfa, model fit, reliability, rmsea
    • Replies: 12
    • Views: 2,976
    09-12-2014, 02:25 AM Go to last post
  56. post hoc/planned comparisons, what's ok and what's not ok?

    Hi, first time here and hoping you guys can help. I am working on a few analyses for my PI. The problem is that she knows nothing about stats and...

    Started by loust‎, 09-11-2014 07:17 PM
    • Replies: 0
    • Views: 919
    09-11-2014, 07:17 PM Go to last post
  57. Multilevel Linear Modelling Help

    Hi, I'm hoping someone with expertise with MLM/HLM etc might be able to help me. I recently conducted a transmission chain study looking at the...

    Started by freofan‎, 09-09-2014 09:50 PM
    fixed effects, hlm, mlm, random effects
    • Replies: 6
    • Views: 1,657
    09-10-2014, 11:10 PM Go to last post
  58. Factor Analysis and correlated measurement errors

    Hi, I am planning to do an experiment which seeks to measure two latent constructs related to different types of cognitive processing. For each...

    Started by Scarlatti‎, 09-09-2014 08:37 PM
    • Replies: 0
    • Views: 1,699
    09-09-2014, 08:37 PM Go to last post
  59. Multiple Dependent Variables and Multiple Time Points?

    Hello! I have a question about how to analyze my data. I have two groups, experimental VS control and 4 different measures related to various...

    Started by will22‎, 09-06-2014 01:33 PM
    • Replies: 0
    • Views: 1,560
    09-06-2014, 01:33 PM Go to last post
  60. Negative ICC values in SPSS

    Hi there, I have run an ICC to assess if scores for 5 dimensions of a quality of life scale have been rated the same by child and their parent....

    Started by Tazmes‎, 09-06-2014 08:33 AM
    icc, negative, spss, spss 21, variance
    • Replies: 0
    • Views: 2,564
    09-06-2014, 08:33 AM Go to last post

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