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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, 11-09-2005 11:21 PM
    • Replies: 0
    • Views: 22,707
    11-09-2005, 11:21 PM Go to last post
  1. [R - "interval range"] - how to analyse a self-applied range?

    I am conducting a experiment in the form of a survey where I test the effect of three different framings on the same subject (data collecting has not...

    Started by hotjer‎, 02-09-2015 05:20 PM
    • Replies: 0
    • Views: 463
    02-09-2015, 05:20 PM Go to last post
  2. Violation of Homogeneity of Variance

    I'm using SPSS to test whether my two groups (HCs and Offspring) have a difference in the number of errors comitted on a psych measure. Total sample...

    Started by Shayshu‎, 02-05-2015 06:30 PM
    • Replies: 7
    • Views: 970
    02-09-2015, 05:00 PM Go to last post
  3. 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 04:06 AM
    • Replies: 5
    • Views: 1,257
    02-06-2015, 08:59 AM Go to last post
  4. A psy student in desperate need of help.

    Hey guys, lovely to know there's a forum that does SPSS. I have a task in Inferential Statistics that consists of 5 questions. I got two covered, but...

    Started by Ross‎, 02-04-2015 06:16 AM
    • Replies: 3
    • Views: 886
    02-05-2015, 01:19 PM Go to last post
  5. What test?

    Hello, I have 46 participants coming on three different days. They will be doing 3 tasks with three treatment/stimulation conditions. 1st...

    Started by rafiq‎, 02-05-2015 09:51 AM
    • Replies: 0
    • Views: 525
    02-05-2015, 09:51 AM Go to last post
  6. Psychology Research Data Analysis Help

    Just a little background on my data: I have been thinking about names and how I cannot imagine anyone I know to have a different name. Their name...

    Started by BrownIRL‎, 02-04-2015 02:34 PM
    • Replies: 2
    • Views: 702
    02-04-2015, 05:37 PM Go to last post
  7. Sociology - A Mapping of Cultural Practices

    Hi, For my thesis I study the french cultural social network SensCritique.com allowing people to rate and review different kind of cultural...

    Started by Mistral‎, 01-30-2015 06:16 AM
    • Replies: 2
    • Views: 745
    02-04-2015, 03:00 AM Go to last post
  8. 3 ways to decompose the strength of prediction in linear regression.

    I am wondering how to explain the three ways that the strength of prediction in linear regression can be decomposed. I need to explain using words...

    Started by Maybel‎, 03-26-2013 07:23 PM
    • Replies: 5
    • Views: 1,860
    02-03-2015, 12:13 AM Go to last post
  9. An unusual case

    Having some trouble figuring out the appropriate test for my data. The problem is structured as follows. For each of my subjects I have: 1) a...

    Started by grayden‎, 02-02-2015 09:50 PM
    • Replies: 0
    • Views: 466
    02-02-2015, 09:50 PM Go to last post
  10. Please help--what test do I use?

    Hello, I'm trying to answer the following using SPSS: is there a difference in Offspring Children and Healthy Controls on the number of errors...

    Started by Shayshu‎, 02-01-2015 11:38 PM
    • Replies: 1
    • Views: 543
    02-02-2015, 02:43 AM Go to last post
  11. need some help for finding the right method :)


    Started by uku1234‎, 02-01-2015 08:36 PM
    • Replies: 0
    • Views: 478
    02-01-2015, 08:36 PM Go to last post
  12. 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, 01-29-2015 02:50 AM
    method, research design
    • Replies: 2
    • Views: 754
    01-29-2015, 05:40 PM Go to last post
  13. 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 01:46 PM
    • Replies: 2
    • Views: 644
    01-27-2015, 04:23 AM Go to last post
  14. 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 10:33 PM
    between-groups, change, groups, within-groups
    • Replies: 1
    • Views: 607
    01-24-2015, 10:34 PM Go to last post
  15. 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 02:47 PM
    data analysis, emotion, music
    • Replies: 2
    • Views: 831
    01-24-2015, 10:12 AM Go to last post
  16. 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 04:23 PM
    • Replies: 1
    • Views: 742
    01-22-2015, 06:57 AM Go to last post
  17. 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 12:35 PM
    hlm, multilevel
    • Replies: 4
    • Views: 961
    01-19-2015, 01:59 PM Go to last post
  18. 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 11:05 AM
    • Replies: 1
    • Views: 668
    01-19-2015, 02:29 AM Go to last post
  19. 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 11:02 AM
    • Replies: 1
    • Views: 776
    01-19-2015, 02:25 AM Go to last post
  20. 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 07:03 AM
    • Replies: 0
    • Views: 1,231
    01-12-2015, 07:03 AM Go to last post
  21. 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 08:00 AM
    bonferroni correction, pairwise comparisons, spss
    • Replies: 1
    • Views: 1,521
    01-07-2015, 08:25 AM Go to last post
  22. 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 07:38 AM
    • Replies: 2
    • Views: 930
    01-03-2015, 11:27 PM Go to last post
  23. 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 09:47 AM
    • Replies: 0
    • Views: 639
    12-29-2014, 09:47 AM Go to last post
  24. 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 05:33 PM
    • Replies: 5
    • Views: 1,097
    12-23-2014, 10:00 AM Go to last post
  25. 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 03:48 AM
    • Replies: 5
    • Views: 1,285
    12-18-2014, 03:12 PM Go to last post
  26. 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 03:59 PM
    meta-analysis, systematic review
    • Replies: 0
    • Views: 672
    12-13-2014, 03:59 PM Go to last post
  27. 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 08:30 PM
    • Replies: 0
    • Views: 710
    12-12-2014, 08:30 PM Go to last post
  28. 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 04:12 AM
    • Replies: 0
    • Views: 646
    12-11-2014, 04:12 AM Go to last post
  29. 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 09:26 AM
    • Replies: 2
    • Views: 870
    12-08-2014, 01:44 PM Go to last post
  30. 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, 12-05-2014 11:55 PM
    • Replies: 0
    • Views: 800
    12-05-2014, 11:55 PM Go to last post
  31. 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 11:20 AM
    correlation, qualitative variation, time trend
    • Replies: 0
    • Views: 594
    12-03-2014, 11:20 AM Go to last post
  32. 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 11:23 AM
    • Replies: 2
    • Views: 970
    11-27-2014, 05:49 PM Go to last post
  33. 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 03:19 PM
    • Replies: 5
    • Views: 1,070
    11-24-2014, 09:30 PM Go to last post
  34. 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 01:12 PM
    • Replies: 4
    • Views: 1,050
    11-24-2014, 03:27 AM Go to last post
  35. 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 03:48 PM
    • Replies: 3
    • Views: 856
    11-21-2014, 05:25 PM Go to last post
  36. 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 02:25 PM
    anova, log10, residuals non-normal, transformations
    • Replies: 13
    • Views: 2,172
    11-16-2014, 03:31 PM Go to last post
  37. 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 06:20 PM
    • Replies: 1
    • Views: 878
    11-13-2014, 10:13 PM Go to last post
  38. 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 11:06 AM
    • Replies: 3
    • Views: 963
    11-13-2014, 09:44 AM Go to last post
  39. 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 07:07 AM
    • Replies: 1
    • Views: 935
    11-12-2014, 12:58 PM Go to last post
  40. 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 02:16 PM
    • Replies: 0
    • Views: 696
    11-11-2014, 02:16 PM Go to last post
  41. 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: 1,492
    11-10-2014, 06:04 PM Go to last post
  42. 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 12:14 PM
    chance level, performance, significance test
    • Replies: 4
    • Views: 942
    11-10-2014, 03:17 PM Go to last post
  43. 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 12:19 PM
    • Replies: 2
    • Views: 929
    11-10-2014, 07:45 AM Go to last post
  44. 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 01:54 PM
    • Replies: 2
    • Views: 1,076
    11-08-2014, 04:33 PM Go to last post
  45. 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 01:37 PM
    • Replies: 0
    • Views: 897
    11-08-2014, 01:37 PM Go to last post
  46. 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 04:22 PM
    • Replies: 0
    • Views: 601
    11-06-2014, 04:22 PM Go to last post
  47. 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 09:53 AM
    random answers, survey
    • Replies: 3
    • Views: 795
    11-06-2014, 11:20 AM Go to last post
  48. 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 05:02 AM
    • Replies: 3
    • Views: 700
    11-06-2014, 11:08 AM Go to last post
  49. 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 06:21 PM
    • Replies: 3
    • Views: 1,481
    11-06-2014, 10:59 AM Go to last post
  50. 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 07:47 PM
    • Replies: 0
    • Views: 949
    11-05-2014, 07:47 PM Go to last post
  51. 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 06:31 PM
    • Replies: 0
    • Views: 828
    11-05-2014, 06:31 PM Go to last post
  52. 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 04:37 PM
    • Replies: 5
    • Views: 1,153
    11-05-2014, 12:21 AM Go to last post
  53. 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: 1,203
    11-04-2014, 06:10 PM Go to last post
  54. 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 07:03 AM
    • Replies: 0
    • Views: 621
    11-04-2014, 07:03 AM Go to last post
  55. 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 04:52 AM
    little's mcar, mcar, missing, missing data, missing value analysis
    • Replies: 1
    • Views: 698
    11-04-2014, 05:03 AM Go to last post
  56. 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: 3,334
    11-03-2014, 09:14 AM Go to last post
  57. 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 02:02 PM
    • Replies: 3
    • Views: 1,191
    11-02-2014, 04:25 PM Go to last post
  58. 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: 695
    11-01-2014, 07:28 AM Go to last post
  59. 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: 874
    10-31-2014, 08:49 AM Go to last post
  60. 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: 1,630
    10-30-2014, 08:56 AM Go to last post

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