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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: 12,945
    11-10-2005, 12:21 AM Go to last post
  1. 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: 4
    • Views: 370
    12-16-2014, 04:11 PM Go to last post
  2. Which method is best for synthesising effectiveness data of interventions?

    Hello everyone, I was wondering if someone might be able to point me in the right direction... I want to combine the findings of several...

    Started by Ant_Thompson‎, 12-13-2014 04:59 PM
    meta-analysis, systematic review
    • Replies: 0
    • Views: 125
    12-13-2014, 04:59 PM Go to last post
  3. One-way ANOVA - which is best effect size stats to report for unequal size samples?

    I am finding quite contradictory information on line as to which best statistics to use for effect size for one-way ANOVA when the size of the groups...

    Started by Arvoriad‎, 12-12-2014 09:30 PM
    • Replies: 0
    • Views: 124
    12-12-2014, 09:30 PM Go to last post
  4. Needed effect size of a treatment from variation of base stimuli?

    Hello, from a previous experiment I know the variance of ratings from subjects to a given stimulus in its original form. Now if I make an...

    Started by masch‎, 12-11-2014 05:12 AM
    • Replies: 0
    • Views: 121
    12-11-2014, 05:12 AM Go to last post
  5. small SD

    Hi, for my stats course, we are using a programme my tutor made himself and we found that having a small SD compared to large doesn't actually affect...

    Started by Rupert93‎, 12-08-2014 10:26 AM
    • Replies: 2
    • Views: 167
    12-08-2014, 02:44 PM Go to last post
  6. correlation/regression with data that's non-normally distributed, collinear, missing

    I have a dataset that's like this: dependent variable: standardized test score independent variables: weeks spent using study method A weeks...

    Started by chronicidal‎, 12-06-2014 12:55 AM
    • Replies: 0
    • Views: 197
    12-06-2014, 12:55 AM Go to last post
  7. how to determine qualitative dispersion over time with differing sample sizes

    I've been working on a study with workers at a certain plant, to test their safety awareness. During a meeting, everyone is asked to select a card...

    Started by Junes‎, 12-03-2014 12:20 PM
    correlation, qualitative variation, time trend
    • Replies: 0
    • Views: 178
    12-03-2014, 12:20 PM Go to last post
  8. Single Subject Research Analyses

    Hello, Thank you in advance for taking the time to read and consider this problem. I really appreciate it. I am doing some single subject...

    Started by clareish‎, 11-27-2014 12:23 PM
    • Replies: 2
    • Views: 286
    11-27-2014, 06:49 PM Go to last post
  9. latent class analysis

    Hi all: I'm interested in using a set of 6 binary indicators to do a latent class analysis and I'm wondering if my strategy can be improved. We...

    Started by jamesmartinn‎, 11-26-2014 08:38 AM
    • Replies: 1
    • Views: 230
    11-26-2014, 12:30 PM Go to last post
  10. 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: 321
    11-24-2014, 10:30 PM Go to last post
  11. 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: 283
    11-24-2014, 04:27 AM Go to last post
  12. 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: 266
    11-21-2014, 06:25 PM Go to last post
  13. 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: 490
    11-16-2014, 04:31 PM Go to last post
  14. 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: 200
    11-13-2014, 11:13 PM Go to last post
  15. 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: 213
    11-13-2014, 10:44 AM Go to last post
  16. 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: 206
    11-12-2014, 01:58 PM Go to last post
  17. 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: 203
    11-11-2014, 03:16 PM Go to last post
  18. 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: 873
    11-10-2014, 07:04 PM Go to last post
  19. 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: 290
    11-10-2014, 04:17 PM Go to last post
  20. 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: 336
    11-10-2014, 08:45 AM Go to last post
  21. 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: 391
    11-08-2014, 05:33 PM Go to last post
  22. 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: 318
    11-08-2014, 02:37 PM Go to last post
  23. 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: 217
    11-06-2014, 05:22 PM Go to last post
  24. 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: 266
    11-06-2014, 12:20 PM Go to last post
  25. 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: 238
    11-06-2014, 12:08 PM Go to last post
  26. 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: 364
    11-06-2014, 11:59 AM Go to last post
  27. 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: 247
    11-05-2014, 08:47 PM Go to last post
  28. 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: 337
    11-05-2014, 07:31 PM Go to last post
  29. 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: 419
    11-05-2014, 01:21 AM Go to last post
  30. 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: 444
    11-04-2014, 07:10 PM Go to last post
  31. 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: 197
    11-04-2014, 08:03 AM Go to last post
  32. 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: 166
    11-04-2014, 06:03 AM Go to last post
  33. 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: 331
    11-03-2014, 10:14 AM Go to last post
  34. 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: 257
    11-02-2014, 05:25 PM Go to last post
  35. 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: 257
    11-01-2014, 08:28 AM Go to last post
  36. 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: 230
    10-31-2014, 09:49 AM Go to last post
  37. 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: 485
    10-30-2014, 09:56 AM Go to last post
  38. 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: 383
    10-23-2014, 10:21 AM Go to last post
  39. 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: 231
    10-23-2014, 12:09 AM Go to last post
  40. 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: 218
    10-22-2014, 01:05 PM Go to last post
  41. 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: 185
    10-22-2014, 11:50 AM Go to last post
  42. 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: 157
    10-21-2014, 11:22 AM Go to last post
  43. 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: 284
    10-21-2014, 07:49 AM Go to last post
  44. 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: 374
    10-18-2014, 07:29 AM Go to last post
  45. 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: 260
    10-18-2014, 04:02 AM Go to last post
  46. 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: 315
    10-15-2014, 08:53 AM Go to last post
  47. 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: 335
    10-15-2014, 05:53 AM Go to last post
  48. 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: 214
    10-14-2014, 08:39 AM Go to last post
  49. 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: 339
    10-12-2014, 03:51 PM Go to last post
  50. 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: 248
    10-12-2014, 12:09 PM Go to last post
  51. 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: 452
    10-08-2014, 04:48 PM Go to last post
  52. 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: 259
    10-08-2014, 10:15 AM Go to last post
  53. 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: 192
    10-08-2014, 09:09 AM Go to last post
  54. 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: 293
    10-07-2014, 05:43 PM Go to last post
  55. 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: 265
    10-06-2014, 08:54 PM Go to last post
  56. 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: 335
    10-06-2014, 12:51 AM Go to last post
  57. 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: 250
    09-30-2014, 08:13 AM Go to last post
  58. 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: 487
    09-27-2014, 01:33 PM Go to last post
  59. 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: 316
    09-26-2014, 05:09 AM Go to last post
  60. 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: 327
    09-25-2014, 01:55 PM Go to last post

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