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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: 26,272
    11-10-2005, 12:21 AM Go to last post
  1. nonparametric test for group differences?

    Hello, I have a simple question. I am not too familiar with nonparametric tests. I want to see if there are group differences in book selection....

    Started by lauralee‎, 08-15-2013 01:22 AM
    • Replies: 1
    • Views: 697
    08-15-2013, 04:58 AM Go to last post
  2. Testing difference between correlations using fishers exact test?

    Hello everyone, I have a sample n= 92 where I am looking for relationships between characteristics (age, gender, religiosity, education) attitudes...

    Started by RachelH‎, 08-14-2013 01:26 PM
    • Replies: 0
    • Views: 895
    08-14-2013, 01:26 PM Go to last post
  3. a method for calculating the proportional mediating effect

    Dear All Hi I am Amir from Iran where we have no a well know psychologist especially in quantitative.I am not good in mediation. I used Preacher...

    Started by amirpakpour‎, 08-14-2013 08:34 AM
    mediating effect, mediation, r-squared
    • Replies: 0
    • Views: 1,311
    08-14-2013, 08:34 AM Go to last post
  4. Standard Multiple Regression AND APA format write-up

    Hi all, I was just wondering if anyone knew the correct APA format to write up the results of a standard multiple regression ran in SPSS. I have...

    Started by MPsy‎, 08-14-2013 03:47 AM
    apa 6th ed., spss, write ups
    • Replies: 0
    • Views: 2,131
    08-14-2013, 03:47 AM Go to last post
  5. Statistical tests for a research study

    Dear All, Firstly, I am an absolute novice with respect to quantitative statistical analysis and I need a little guidance and all help would be...

    Started by mjm93‎, 07-30-2013 04:55 AM
    • Replies: 2
    • Views: 1,342
    08-13-2013, 02:08 PM Go to last post
  6. What correlation should I run?

    I have two data sets from identical ordinal scales (Never, Rarely, Occasionally, Often, Very Often). What correlation should I run?

    Started by sonishell‎, 08-13-2013 09:29 AM
    correlation, ordinal
    • Replies: 4
    • Views: 923
    08-13-2013, 12:05 PM Go to last post
  7. How to conduct mediation analysis with ordinal (probit) regressions

    Hello everyone, I need to conduct a mediation analysis in which all the variables (i.e., the predictor, mediator, and outcome) are single items...

    Started by rezarta‎, 08-12-2013 04:17 PM
    mediation, ordinal regression, probit, spss
    • Replies: 0
    • Views: 1,937
    08-12-2013, 04:17 PM Go to last post
  8. Interaction of two variables

    Hello all, I am using the effort reward imbalance questionnaire in my thesis research. I am really struggling on how to calculate the imbalance of...

    Started by kaz‎, 08-06-2013 04:07 AM
    • Replies: 6
    • Views: 1,058
    08-10-2013, 07:51 AM Go to last post
  9. What's the best test - I'm totally confused

    Hi Everybody, I could do with so help here. The main source of my problem is that I'm a little confused as to whether the members of my sample...

    Started by sophie2cu2‎, 08-10-2013 05:06 AM
    • Replies: 0
    • Views: 791
    08-10-2013, 05:06 AM Go to last post
  10. Wink Wilcoxon test

    I encountered the following stats in a results section: Wilcoxon test: z = 2.48, tied p < .007. What does "tied" mean?

    Started by psnoice‎, 08-07-2013 05:09 PM
    wilcoxon-test
    • Replies: 8
    • Views: 1,154
    08-08-2013, 11:08 AM Go to last post
  11. Interaction and negative binomial regression analysis for criminological thesis

    Hello, For my master's thesis I'm conducting a research on the influence of morality and self-control on self-reported delinquency. Morality is a...

    Started by eneirync‎, 08-06-2013 03:12 PM
    criminology, interaction, negative binomial, ols
    • Replies: 6
    • Views: 3,465
    08-07-2013, 06:59 AM Go to last post
  12. Post Likert scale - categories

    Hello there, For my doctoral thesis, I am analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are...

    Started by frederiquef‎, 08-07-2013 03:48 AM
    • Replies: 0
    • Views: 1,025
    08-07-2013, 03:48 AM Go to last post
  13. Not sure how to present data - 3D scatter?

    To help aid the reader of my thesis I want to present some perceptual data in a graph or table format, but am unsure what approach to use as I want...

    Started by helpless2k‎, 08-02-2013 11:17 AM
    3 way, perception, psychology
    • Replies: 4
    • Views: 1,069
    08-06-2013, 07:10 AM Go to last post
  14. Computing the reliability of a single item scale

    I am using a single item measure of self-esteem for my study and have computing the scale reliabilities of my other measures using cronbach's alpha....

    Started by Lolly‎, 08-05-2013 04:58 PM
    • Replies: 2
    • Views: 1,760
    08-06-2013, 07:04 AM Go to last post
  15. Quick question: When reporting on Cronbach's Alpha..

    Do you round up? So if using 2 decimal places, would .885 be rounded up to .89, or do you report it as .88? Many thanks! Lolly

    Started by Lolly‎, 08-05-2013 03:45 PM
    • Replies: 6
    • Views: 6,718
    08-05-2013, 04:51 PM Go to last post
  16. Question Literature review: comparing prevalences calculated from existing data. Chi-squared?

    I am currently conducting a systematic review of the literature on the prevalence and topography of challenging behaviours (such as self-injury and...

    Started by rlh432‎, 08-05-2013 10:56 AM
    compare rates, prevalence, review
    • Replies: 0
    • Views: 1,027
    08-05-2013, 10:56 AM Go to last post
  17. Stuck on MANOVAs: How do I run a MIXED MANOVA in SPSS?

    I have been searching everywhere online and I really can't find the answer! No uni lecture notes, youtube tutorials, nothing. I need to conduct a...

    Started by Lolly‎, 08-03-2013 09:47 AM
    • Replies: 3
    • Views: 5,830
    08-05-2013, 03:02 AM Go to last post
  18. Chi-square analysis for (possibly) not independent observations?

    Hello all, I have recently passed my PhD viva, and one of the examiners asked me to make a correction in my statistical analysis. I would greatly...

    Started by Leloni‎, 08-02-2013 11:19 AM
    • Replies: 5
    • Views: 1,571
    08-03-2013, 01:25 PM Go to last post
  19. Data not normally distributed-what to do?

    `Hey guys, I'm hoping someone can give me some advice on this. I collected data for 4 continuous DVs from 408 people. I want to do ANCOVAs and so...

    Started by lir6777‎, 08-02-2013 06:42 AM
    • Replies: 5
    • Views: 2,338
    08-02-2013, 10:32 AM Go to last post
  20. Imputation at the item level vs scale level

    Hello all. I wonder if someone could help me to clarify a doubt. It is usually said that it is always better (if possible) to impute at the...

    Started by Holmes‎, 08-02-2013 04:18 AM
    • Replies: 3
    • Views: 1,226
    08-02-2013, 05:08 AM Go to last post
  21. Which statistical test to use

    Hi everyone, I'm a little bit confused as to what kind of analysis to do, and would really appreciate some advice from people more statistically...

    Started by lindles‎, 07-29-2013 12:02 PM
    • Replies: 10
    • Views: 1,462
    07-31-2013, 07:20 AM Go to last post
  22. Optimal clustering

    I have demographic data which includes birth dates and some binary variables for each of several hundred people sampled. An example for a binary...

    Started by jobxyz1‎, 07-30-2013 06:02 AM
    • Replies: 0
    • Views: 636
    07-30-2013, 06:02 AM Go to last post
  23. Statistically Challenged Psychology student!!!

    Hi everyone, I am really hoping that someone here can help me out. I am really struggling with the analysis for a Psychology study I have conducted,...

    Started by Lolly‎, 07-28-2013 01:05 PM
    3x2, intervention, manova, psychology, stress
    • Replies: 1
    • Views: 1,151
    07-29-2013, 06:37 PM Go to last post
  24. How to concluded surveyed data to result

    I am working on a survey where I have to prove/diprove my hypothesis. I am seeking this help/guidance since I am getting hard time to related my...

    Started by x509‎, 07-28-2013 04:41 AM
    anova, survey, survey analysis
    • Replies: 4
    • Views: 1,022
    07-29-2013, 11:48 AM Go to last post
  25. Linear discriminant analysis

    Hi All, Here is my problem. I ran a LDA analysis in SPSS and I go a quite high classification accuracy (72.7%) what I find odd is that the Wilk's...

    Started by ilaria‎, 07-26-2013 08:43 AM
    • Replies: 0
    • Views: 791
    07-26-2013, 08:43 AM Go to last post
  26. Lightbulb ANOVA and mediation- could someone CHECK over this with me? Help gratefully received

    Hi, I really hope someone could help me out. I'm having a crisis of confidence. I have a PhD in psychology but it's been a while since I did...

    Started by Binka‎, 05-30-2013 02:47 AM
    anova, mediation, mediation analysis
    • Replies: 8
    • Views: 5,617
    07-26-2013, 05:02 AM Go to last post
  27. Obtaining the standard error?

    I'm trying to calculate the standard error for some data I have collected for my dissertation. It is a factorial design with a within subjects...

    Started by Phoenix91‎, 07-20-2013 11:16 PM
    • Replies: 2
    • Views: 959
    07-24-2013, 05:45 AM Go to last post
  28. What analysis should I run?

    Hi, I am not sure which analysis to run based on what I am trying to figure out, any guidance is appreciated. The research question is- are...

    Started by audreye‎, 06-25-2013 03:59 PM
    analysis, data analysis, spss
    • Replies: 6
    • Views: 1,317
    07-22-2013, 05:42 PM Go to last post
  29. Question Meaning of "n" when analyzing data

    Hi all, I am a bit confused with "n" in the context of data analysis. Is "n" (1) the number of participants OR (2) the number of observations? ...

    Started by aceadimeins‎, 07-18-2013 06:00 PM
    • Replies: 4
    • Views: 1,141
    07-20-2013, 05:43 AM Go to last post
  30. Survey Design.

    I have a question about survey design. I'm fairly new to it and am looking to see if such a technique is valid. I am hosting a conference with ~20...

    Started by xelink‎, 07-12-2013 06:26 PM
    • Replies: 6
    • Views: 983
    07-19-2013, 05:46 PM Go to last post
  31. Repeated measures MANOVA follow-up

    Greetings everyone. I am new to the forum, so I hope I picked the right section for this thread. Apologies if that's not the case. As you can see...

    Started by Fabio‎, 07-15-2013 05:53 AM
    • Replies: 1
    • Views: 1,184
    07-19-2013, 06:09 AM Go to last post
  32. What is formula for calculating Simple Contrasts test for within-groups ANOVA?

    I need to be able to calculate long hand some Planned Comparison test for a Within-Groups ANOVA framework. I understand the most common tests in such...

    Started by guy‎, 07-08-2013 01:41 PM
    planned comparisons, post hoc test, within-subject anova
    • Replies: 3
    • Views: 2,048
    07-18-2013, 09:37 PM Go to last post
  33. SPSS: Handling Multiple Responses

    Hi Everyone, I have a survey question where participants can select more than one option (e.g. if they have a mood disorder, and an anxiety...

    Started by statsgi‎, 07-11-2013 10:52 AM
    • Replies: 1
    • Views: 1,323
    07-18-2013, 04:56 PM Go to last post
  34. Which ICC to choose if there are missing values?

    I want to say that I am really sorry if this question has already came up but after looking in different posts I could not find good answer. I...

    Started by ata‎, 07-15-2013 06:57 AM
    agreement, icc, missing values
    • Replies: 1
    • Views: 2,563
    07-18-2013, 04:46 PM Go to last post
  35. Survey data analysis - question about sampling weights

    I am analyzing some survey data, and I am confused about how best to weight it. The survey was placed on the internet, and respondents from different...

    Started by oncearunner‎, 07-13-2013 02:45 AM
    • Replies: 1
    • Views: 745
    07-18-2013, 04:37 PM Go to last post
  36. Multinomial Logistic Regression

    Hi everyone, I was wondering if I would be able to use Multinomial Logistic Regression in my study. I want to see whether scores on tests of...

    Started by Ant_Thompson‎, 07-13-2013 08:26 AM
    • Replies: 3
    • Views: 1,535
    07-18-2013, 04:09 PM Go to last post
  37. MANCOVA help!

    Hello, Can anybody help me out? I have had my head in books for ages now and I feel like I am going a little mad! They are either too basic or too...

    Started by EmilyMB‎, 07-17-2013 08:16 AM
    mancova
    • Replies: 2
    • Views: 1,169
    07-18-2013, 05:09 AM Go to last post
  38. Is it possible to compare (with ANOVA) results from cross-correlations data?

    Hello, Id appreciate any thoughts or direction to resources for this dilemma. I like to think myself pretty reasonable at statistics, however I'm...

    Started by Laura_Prsn‎, 07-16-2013 06:11 AM
    anova, cross-correlation
    • Replies: 3
    • Views: 1,336
    07-16-2013, 03:25 PM Go to last post
  39. Comparing correlation coefficients from the same sample

    Can anyone tell me how I can do this using SPSS? So I have self-criticism - self-compassion correlation and brooding-self-compassion correlation and...

    Started by rosenmarsh‎, 07-03-2013 12:22 PM
    • Replies: 6
    • Views: 4,760
    07-12-2013, 07:07 AM Go to last post
  40. 3*3 Mixed ANOVA - non parametric test to use??

    Quite simple really. The dependent variable procures ordinal data - I have 2 related factors and 1 unrelated factor. No idea what NP test is...

    Started by psychonut26‎, 07-12-2013 05:24 AM
    • Replies: 0
    • Views: 800
    07-12-2013, 05:24 AM Go to last post
  41. SPSS: Comparing my data with data from other studies

    Hi Everyone, I'm working with a likert scale measure which I've scored up for participants in my own study. There are two other studies who also...

    Started by statsgi‎, 06-19-2013 03:04 PM
    • Replies: 6
    • Views: 2,280
    07-11-2013, 10:37 AM Go to last post
  42. Question Power analysis and correlations (effect sizes)

    Hi everyone! Im conducting a power analysis to determine the minimum sample size I will need to detect an effect size of 0.3 (i.e., a...

    Started by Abram Rickards‎, 07-08-2013 12:22 PM
    • Replies: 1
    • Views: 869
    07-10-2013, 09:46 AM Go to last post
  43. Psychometrics characteristics - AVE measure

    Dear all, I measure validity and reliability of my questionnaire that presents feedback of users who used our system. I have problem how to...

    Started by tomazv‎, 07-10-2013 08:48 AM
    ave
    • Replies: 0
    • Views: 920
    07-10-2013, 08:48 AM Go to last post
  44. Most appropriate statistical test for this nested design

    I currently am conducting a study where I have three variables: one that is binary, and two numerical variables as measured on a ratio scale. Each of...

    Started by emblem101‎, 07-08-2013 10:48 PM
    anova, hypothesis test, nested design, significance test, spss
    • Replies: 3
    • Views: 1,113
    07-08-2013, 11:37 PM Go to last post
  45. Big Five Personality Experiment...ANOVA/MANOVA or something else?

    Hi everyone! I've been given a data set to analyse but I'm a little unsure of which statistic to use. I'm looking at whether there are any...

    Started by Ant_Thompson‎, 07-05-2013 03:36 AM
    • Replies: 6
    • Views: 1,480
    07-08-2013, 11:43 AM Go to last post
  46. Lightbulb Interpreting a significant manipulation which the scale for doesn't predict DV

    Hello, I have a stats conundrum I have an MSc thesis in which two groups were manipulated to either include others in their group, or manipulated...

    Started by thlws‎, 07-08-2013 12:14 AM
    • Replies: 0
    • Views: 604
    07-08-2013, 12:14 AM Go to last post
  47. CFA - number of indicators

    The measure I am using has only two (parcel) indicators per factor. I know this is not ideal for CFA, but my question is - Is there anything extra I...

    Started by Shannon3232‎, 07-07-2013 07:50 PM
    • Replies: 1
    • Views: 788
    07-07-2013, 08:14 PM Go to last post
  48. Exclamation Statistical test for analyzing 2*3 between-subject design's main & interaction effect

    Hello, I am now having trouble analyzing my data since I got stuck on selecting the proper statistical test to use. My data is a 2*3...

    Started by AnneLearningStats‎, 07-03-2013 12:51 AM
    factorial analysis, friedman two way anova, interaction effect, non-parametric, scheirer-ray_hare test
    • Replies: 3
    • Views: 1,300
    07-05-2013, 02:36 PM Go to last post
  49. Calculating Item Discrimination Index for a Likert Questionnaire

    I am currently in the early stages of developing a scale that measures prejudicial attitudes. I have just run a pilot study with the first draft of...

    Started by glassviolin‎, 07-04-2013 11:48 PM
    discrimination index, item analysis, likert scale, scale development
    • Replies: 0
    • Views: 3,443
    07-04-2013, 11:48 PM Go to last post
  50. Variables correlation out of factor loadings for meta-analysis

    Hi guys, I'm making first steps with the meta-analysis, and I have some dummy questions regarding which I would like to get your help. 1. In...

    Started by Darko‎, 07-02-2013 09:18 AM
    • Replies: 0
    • Views: 703
    07-02-2013, 09:18 AM Go to last post
  51. Calculate effect size from regression estimates for meta-analysis

    Hi, I really hope someone can help me, I'm a bit stuck.. I'm running a meta-analysis looking at childhood predictors of personality disorders, so...

    Started by JoKo‎, 07-01-2013 05:06 AM
    effect sizes, meta-analysis
    • Replies: 3
    • Views: 2,994
    07-02-2013, 01:33 AM Go to last post
  52. Should I use an ANCOVA?

    Hi Everyone, I'm working with two scales (one measuring therapeutic alliance and one measuring client satisfaction). While scores on these two...

    Started by statsgi‎, 06-27-2013 02:07 PM
    • Replies: 3
    • Views: 1,522
    07-01-2013, 02:12 PM Go to last post
  53. Question about contrasts and covariate in cross-design paradigm

    Hello everyone, I need some expert advise for the following stats question. I am evaluating data for a psychological learning experiment with a...

    Started by Martinpescador‎, 06-27-2013 10:21 AM
    anova, covariate, special contrasts, spss syntax
    • Replies: 0
    • Views: 592
    06-27-2013, 10:21 AM Go to last post
  54. Research Issue: Multi item scale/Confirmatory factor analysis

    We conducted a study on information elaboration in teams. After data sampling our supervisor instructed us to also examine the dependent variable...

    Started by 5254‎, 06-23-2013 07:08 AM
    • Replies: 2
    • Views: 1,103
    06-26-2013, 11:31 PM Go to last post
  55. question about degrees of freedom in ANOVA

    Hello, Just figuring out statistics on my own after doing a psycholinguistics study for my undergrad thesis (never taken a statistics class). ...

    Started by dochme‎, 06-24-2013 09:33 PM
    • Replies: 0
    • Views: 1,245
    06-24-2013, 09:33 PM Go to last post
  56. How do you report Fisher's Least Significant Differences results?

    Hi, I've been looking online to see how to report LSD results but I cannot find anything anywhere! :( I understand for a lot of post hoc/planned...

    Started by Vickstar‎, 06-21-2013 10:41 AM
    • Replies: 1
    • Views: 4,221
    06-24-2013, 04:41 PM Go to last post
  57. Confused about causality

    I'm helping a colleague of mine with his homework for his political science master. He's investigating the effect of political orientation on support...

    Started by Junes‎, 06-18-2013 01:44 PM
    causality
    • Replies: 12
    • Views: 2,401
    06-21-2013, 10:35 AM Go to last post
  58. Question Calculating Z-scores for d' (SDT sensitivity)

    Hello, I have a database which contains three distinct groups. My goal is to compare these groups based on the d' sensitivity index which comes...

    Started by foushad‎, 06-20-2013 11:25 AM
    • Replies: 0
    • Views: 2,241
    06-20-2013, 11:25 AM Go to last post
  59. multilevel growth model--should I include random slopes?

    Hi all, I am trying to determine whether I should include random slopes at level 2 of my growth model. I suspect we are right on the borderline...

    Started by MattH‎, 06-14-2013 02:57 PM
    • Replies: 3
    • Views: 1,423
    06-19-2013, 03:11 PM Go to last post
  60. Exclamation PhD - which statistical analysis to use? MLM, t tests, ANOVA?

    Hi, my research question is "do large cognitive changes precede a period of mood stability?" (N = 30), I have 20 therapy sessions data for each...

    Started by scoobydoo‎, 06-17-2013 09:46 AM
    cluster, cognitive, therapy
    • Replies: 1
    • Views: 806
    06-19-2013, 08:08 AM Go to last post

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