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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: 13,735
    11-10-2005, 12:21 AM Go to last post
  1. Unhappy Design to use?

    If I want to test music use for social reasons against music use for personal reasons and scores on an emotional wellbeing questionnaire, would this...

    Started by Tyldo‎, Yesterday 03:50 AM
    method, research design
    • Replies: 2
    • Views: 99
    Yesterday, 06:40 PM Go to last post
  2. How to test my hypothesis?

    TLDR: I have acquired data via questionnaire, want to test hypothesis as in picture below. What to do? Dear all, I am studying psychology in...

    Started by AsbachAlex‎, 01-28-2015 05:06 AM
    • Replies: 1
    • Views: 90
    01-28-2015, 06:08 AM Go to last post
  3. Using a dependent t-test with z-scores

    Hi, I'm trying to run a dependent t-test to check if the manipulation of the independent variable in an experiment worked. The independent...

    Started by ostwaertstramper‎, 01-26-2015 02:46 PM
    • Replies: 2
    • Views: 117
    01-27-2015, 05:23 AM Go to last post
  4. Meaningful Variables

    Some background: I am an early childhood educator taking my very first statistics course. We are in week three and I am already lost. We are...

    Started by amhcmh‎, 04-26-2014 12:12 PM
    • Replies: 3
    • Views: 1,234
    01-26-2015, 08:49 PM Go to last post
  5. Change within groups and differences between groups

    Hi All, I have a question that perhaps is basic for most of you. I am hoping I can rely on your expertise to answer this question. I am trying...

    Started by casher‎, 01-24-2015 11:33 PM
    between-groups, change, groups, within-groups
    • Replies: 1
    • Views: 157
    01-24-2015, 11:34 PM Go to last post
  6. Complex study data analysis

    Good afternoon, I have a long-running experiment on music and emotion for my Ph.D. research. Big picture—there have been nine total ‘versions’...

    Started by brennon‎, 01-23-2015 03:47 PM
    data analysis, emotion, music
    • Replies: 2
    • Views: 178
    01-24-2015, 11:12 AM Go to last post
  7. Smile Factorial where you can't cross every factor?

    Does anyone know how to do a factorial analysis where you can't cross every factor? I did a melody recognition study where I measured accuracy of...

    Started by TomR‎, 01-21-2015 05:23 PM
    • Replies: 1
    • Views: 141
    01-22-2015, 07:57 AM Go to last post
  8. Weaknesses in the assumptions misuses of HLM/multilevel modeling

    Hopefully the title says it. What do people see as potential/perceived weaknesses in the assumptions and/or misuses of HLM/multilevel modeling?

    Started by trinker‎, 01-17-2015 01:35 PM
    hlm, multilevel
    • Replies: 4
    • Views: 247
    01-19-2015, 02:59 PM Go to last post
  9. MANCOVA w/ continuous IV?

    For my thesis, I originally proposed to do a MANCOVA with various continuous covariates, four continuous DVs, and two categorical IVs, one of which I...

    Started by ImSkyKid‎, 01-14-2015 12:05 PM
    • Replies: 1
    • Views: 136
    01-19-2015, 03:29 AM Go to last post
  10. non parametric one sample binomial test

    Hello nice people, I am facing a problem with the binomial test in SPSS; i do not know how to interpret it :( I have to submit my thesis on...

    Started by missmiou‎, 01-17-2015 12:02 PM
    • Replies: 1
    • Views: 165
    01-19-2015, 03:25 AM Go to last post
  11. Age as covariate removes interaction with group

    Hello, I'm new here. Thanks for reading. I'm running a between subjects repeated measures anova in spss. I have one factor (with two levels;...

    Started by stats_noob7‎, 01-12-2015 08:03 AM
    • Replies: 0
    • Views: 317
    01-12-2015, 08:03 AM Go to last post
  12. bonferroni corrected p-values pairwise comparisons SPSS

    Dear, I am using Linear Mixed Modeling in SPSS. I have a significant interaction between two variables: correctness (2 levels: correct vs error)...

    Started by desS‎, 01-07-2015 09:00 AM
    bonferroni correction, pairwise comparisons, spss
    • Replies: 1
    • Views: 234
    01-07-2015, 09:25 AM Go to last post
  13. 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: 2
    • Views: 429
    01-04-2015, 12:27 AM Go to last post
  14. need help for chose statistic methods

    hello every body. Im doing a research to comparing to type of exercise in body composition. per exercise protocol has 4 steps testing (pre-test,...

    Started by ali127‎, 12-29-2014 10:47 AM
    anova
    • Replies: 0
    • Views: 213
    12-29-2014, 10:47 AM Go to last post
  15. Need to use Bonferroni?

    Hi there, I am unsure whether I need to use a Bonferroni correction... I have conducted 20 paired t-tests to analyse change in scores from...

    Started by flapjacj2000‎, 12-20-2014 06:33 PM
    • Replies: 5
    • Views: 434
    12-23-2014, 11:00 AM Go to last post
  16. 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: 5
    • Views: 652
    12-18-2014, 04:12 PM Go to last post
  17. 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: 278
    12-13-2014, 04:59 PM Go to last post
  18. 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: 277
    12-12-2014, 09:30 PM Go to last post
  19. 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: 249
    12-11-2014, 05:12 AM Go to last post
  20. 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: 270
    12-08-2014, 02:44 PM Go to last post
  21. 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: 332
    12-06-2014, 12:55 AM Go to last post
  22. 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: 255
    12-03-2014, 12:20 PM Go to last post
  23. 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: 434
    11-27-2014, 06:49 PM Go to last post
  24. 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: 457
    11-24-2014, 10:30 PM Go to last post
  25. 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: 404
    11-24-2014, 04:27 AM Go to last post
  26. Statistics test for frequency counts (please read!)

    Hello, Please forgive my ignorance, it’s 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: 353
    11-21-2014, 06:25 PM Go to last post
  27. 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: 639
    11-16-2014, 04:31 PM Go to last post
  28. 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: 240
    11-13-2014, 11:13 PM Go to last post
  29. 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: 277
    11-13-2014, 10:44 AM Go to last post
  30. 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: 256
    11-12-2014, 01:58 PM Go to last post
  31. 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: 277
    11-11-2014, 03:16 PM Go to last post
  32. 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: 959
    11-10-2014, 07:04 PM Go to last post
  33. 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: 343
    11-10-2014, 04:17 PM Go to last post
  34. 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: 440
    11-10-2014, 08:45 AM Go to last post
  35. 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: 511
    11-08-2014, 05:33 PM Go to last post
  36. 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: 417
    11-08-2014, 02:37 PM Go to last post
  37. 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: 255
    11-06-2014, 05:22 PM Go to last post
  38. 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: 317
    11-06-2014, 12:20 PM Go to last post
  39. 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: 286
    11-06-2014, 12:08 PM Go to last post
  40. 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: 550
    11-06-2014, 11:59 AM Go to last post
  41. 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: 291
    11-05-2014, 08:47 PM Go to last post
  42. 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: 466
    11-05-2014, 07:31 PM Go to last post
  43. 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: 546
    11-05-2014, 01:21 AM Go to last post
  44. 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: 569
    11-04-2014, 07:10 PM Go to last post
  45. 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: 266
    11-04-2014, 08:03 AM Go to last post
  46. 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: 214
    11-04-2014, 06:03 AM Go to last post
  47. 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: 397
    11-03-2014, 10:14 AM Go to last post
  48. 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: 319
    11-02-2014, 05:25 PM Go to last post
  49. 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: 292
    11-01-2014, 08:28 AM Go to last post
  50. 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 10:53 AM
    • Replies: 2
    • Views: 271
    10-31-2014, 09:49 AM Go to last post
  51. 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: 561
    10-30-2014, 09:56 AM Go to last post
  52. 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: 495
    10-23-2014, 10:21 AM Go to last post
  53. 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: 265
    10-23-2014, 12:09 AM Go to last post
  54. 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: 255
    10-22-2014, 01:05 PM Go to last post
  55. 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: 223
    10-22-2014, 11:50 AM Go to last post
  56. 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: 198
    10-21-2014, 11:22 AM Go to last post
  57. 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: 325
    10-21-2014, 07:49 AM Go to last post
  58. 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 07:22 AM
    • Replies: 5
    • Views: 434
    10-18-2014, 07:29 AM Go to last post
  59. 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: 313
    10-18-2014, 04:02 AM Go to last post
  60. 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: 366
    10-15-2014, 08:53 AM Go to last post

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