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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: 12,793
    11-10-2005, 12:21 AM Go to last post
  1. Can someone give me feedback about this post-hoc study of learner retention?

    Hello all, I studied experimental psychology at university and had two under grad courses in stats plus research methods, advanced quantitative...

    Started by kyiv‎, 11-19-2014 04:19 PM
    • Replies: 5
    • Views: 212
    Yesterday, 10:30 PM Go to last post
  2. Comparing the validity of two scales to a golden standard

    Hi there! I've been advising a friend on his research project, but I have to admit I'm a bit out of my league and would appreciate any help. He is...

    Started by Junes‎, 11-23-2014 02:12 PM
    • Replies: 4
    • Views: 190
    Yesterday, 04:27 AM Go to last post
  3. Statistics test for frequency counts (please read!)

    Hello, Please forgive my ignorance, itís been a while since I have done any quantitative research. I used to be okay at it, but I always...

    Started by clareish‎, 11-21-2014 04:48 PM
    • Replies: 3
    • Views: 181
    11-21-2014, 06:25 PM Go to last post
  4. Please help! Running ANOVA with skewed data in some conditions

    Hi there, I really hope you can help. I've been looking on a number of forums and have had no luck. Also have been looking through some of the...

    Started by ninja‎, 11-06-2014 03:25 PM
    anova, log10, residuals non-normal, transformations
    • Replies: 13
    • Views: 390
    11-16-2014, 04:31 PM Go to last post
  5. Outliers with skewed distributions

    Hi! I hope you can help! I'm using the outlier labelling rule (with a g multiplier of 2.2) to remove outliers in any normally distributed dependent...

    Started by ninja‎, 11-13-2014 07:20 PM
    • Replies: 1
    • Views: 148
    11-13-2014, 11:13 PM Go to last post
  6. cohens d and nominal data pwweaase help

    Hey, I was wondering why I have been told to do a wilcoxin for my child psychology study on overimitation...the DV is nominal(they overimitate or...

    Started by Rupert93‎, 11-11-2014 12:06 PM
    • Replies: 3
    • Views: 167
    11-13-2014, 10:44 AM Go to last post
  7. Summation Scores - assumptions

    Hi, maybe not practical in essence, but: what are the assumptions underlying summated scores (simple summation of Yes/No dichotomous items or...

    Started by Martin Marko‎, 11-12-2014 08:07 AM
    • Replies: 1
    • Views: 157
    11-12-2014, 01:58 PM Go to last post
  8. 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: 140
    11-11-2014, 03:16 PM Go to last post
  9. How to do stratified randomised allocation.

    Hello, Can anyone clearly explain some good, proper methods to do stratified randomised allocation? I have looked in my stats/research books...

    Started by Jake-Finn‎, 11-05-2014 04:48 AM
    • Replies: 3
    • Views: 224
    11-11-2014, 09:28 AM Go to last post
  10. 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 02:11 PM
    • Replies: 1
    • Views: 783
    11-10-2014, 07:04 PM Go to last post
  11. 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: 181
    11-10-2014, 04:17 PM Go to last post
  12. 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: 250
    11-10-2014, 08:45 AM Go to last post
  13. 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: 293
    11-08-2014, 05:33 PM Go to last post
  14. 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: 242
    11-08-2014, 02:37 PM Go to last post
  15. 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: 165
    11-06-2014, 05:22 PM Go to last post
  16. 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: 210
    11-06-2014, 12:20 PM Go to last post
  17. 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: 185
    11-06-2014, 12:08 PM Go to last post
  18. 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: 241
    11-06-2014, 11:59 AM Go to last post
  19. 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: 191
    11-05-2014, 08:47 PM Go to last post
  20. 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: 216
    11-05-2014, 07:31 PM Go to last post
  21. 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: 316
    11-05-2014, 01:21 AM Go to last post
  22. 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 04:30 PM
    paired samples t-test, pre-post, repeated measure anova
    • Replies: 1
    • Views: 354
    11-04-2014, 07:10 PM Go to last post
  23. 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: 152
    11-04-2014, 08:03 AM Go to last post
  24. 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: 135
    11-04-2014, 06:03 AM Go to last post
  25. 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 04:12 AM
    sample size
    • Replies: 4
    • Views: 277
    11-03-2014, 10:14 AM Go to last post
  26. 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: 222
    11-02-2014, 05:25 PM Go to last post
  27. 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 08:30 AM
    • Replies: 2
    • Views: 224
    11-01-2014, 08:28 AM Go to last post
  28. 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, letís assume the...

    Started by Kalle‎, 10-30-2014 10:53 AM
    • Replies: 2
    • Views: 188
    10-31-2014, 09:49 AM Go to last post
  29. 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 09:35 AM
    cohen's kappa, test-retest
    • Replies: 8
    • Views: 455
    10-30-2014, 09:56 AM Go to last post
  30. 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 04:10 AM
    correlation, pearson's r
    • Replies: 4
    • Views: 309
    10-23-2014, 10:21 AM Go to last post
  31. 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, 10-23-2014 12:09 AM
    logistic regression, mixed-effects, psychology
    • Replies: 0
    • Views: 205
    10-23-2014, 12:09 AM Go to last post
  32. 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 01:05 PM
    chi squared, cooperation, language, prisoners dilemma
    • Replies: 0
    • Views: 190
    10-22-2014, 01:05 PM Go to last post
  33. 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 11:50 AM
    • Replies: 0
    • Views: 158
    10-22-2014, 11:50 AM Go to last post
  34. 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 11:22 AM
    • Replies: 0
    • Views: 131
    10-21-2014, 11:22 AM Go to last post
  35. 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 04:11 AM
    biology, independ variable, independent variable
    • Replies: 1
    • Views: 193
    10-21-2014, 07:49 AM Go to last post
  36. Ancova?

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

    Started by Ajna‎, 10-15-2014 07:22 AM
    • Replies: 5
    • Views: 335
    10-18-2014, 07:29 AM Go to last post
  37. 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 01:57 AM
    • Replies: 1
    • Views: 218
    10-18-2014, 04:02 AM Go to last post
  38. 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 04:34 AM
    • Replies: 4
    • Views: 275
    10-15-2014, 08:53 AM Go to last post
  39. 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 11:37 AM
    • Replies: 4
    • Views: 308
    10-15-2014, 05:53 AM Go to last post
  40. 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 08:39 AM
    help please, spss, statistical test, test statistic equation
    • Replies: 0
    • Views: 189
    10-14-2014, 08:39 AM Go to last post
  41. 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 06:27 AM
    cohen's d
    • Replies: 2
    • Views: 296
    10-12-2014, 03:51 PM Go to last post
  42. 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 08:50 AM
    normality, partial spearman, sample size
    • Replies: 1
    • Views: 224
    10-12-2014, 12:09 PM Go to last post
  43. 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 10:00 AM
    cfa, irt, philosophy
    • Replies: 5
    • Views: 398
    10-08-2014, 04:48 PM Go to last post
  44. 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 09:33 AM
    • Replies: 1
    • Views: 233
    10-08-2014, 10:15 AM Go to last post
  45. 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 09:09 AM
    acceptable, mds, stress-1, values
    • Replies: 0
    • Views: 163
    10-08-2014, 09:09 AM Go to last post
  46. 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 01:50 PM
    • Replies: 2
    • Views: 260
    10-07-2014, 05:43 PM Go to last post
  47. 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 01:24 PM
    • Replies: 1
    • Views: 235
    10-06-2014, 08:54 PM Go to last post
  48. 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 11:31 AM
    anovas, missing data, repeated measures
    • Replies: 3
    • Views: 309
    10-06-2014, 12:51 AM Go to last post
  49. 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 05:38 AM
    • Replies: 2
    • Views: 228
    09-30-2014, 08:13 AM Go to last post
  50. 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 01:16 PM
    • Replies: 5
    • Views: 412
    09-27-2014, 01:33 PM Go to last post
  51. 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 08:47 AM
    • Replies: 4
    • Views: 280
    09-26-2014, 05:09 AM Go to last post
  52. 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 11:33 AM
    • Replies: 9
    • Views: 287
    09-25-2014, 01:55 PM Go to last post
  53. 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 01:47 PM
    • Replies: 0
    • Views: 180
    09-25-2014, 01:47 PM Go to last post
  54. 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: 2,270
    09-23-2014, 07:58 PM Go to last post
  55. 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, 09-23-2014 12:04 AM
    • Replies: 1
    • Views: 196
    09-23-2014, 07:47 AM Go to last post
  56. 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 11:09 AM
    • Replies: 1
    • Views: 281
    09-22-2014, 12:21 PM Go to last post
  57. 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 10:52 PM
    aic, bic, latent growth curve, mplus
    • Replies: 0
    • Views: 204
    09-20-2014, 10:52 PM Go to last post
  58. 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 01:26 PM
    • Replies: 5
    • Views: 370
    09-19-2014, 10:23 AM Go to last post
  59. 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 09:29 AM
    friedman test, help me!, non-parameteric, split-file, spss
    • Replies: 0
    • Views: 181
    09-18-2014, 09:29 AM Go to last post
  60. 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 06:34 AM
    • Replies: 0
    • Views: 159
    09-18-2014, 06:34 AM Go to last post

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