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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: 32,184
    11-10-2005, 12:21 AM Go to last post
  1. 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
    • Replies: 8
    • Views: 1,959
    08-08-2013, 11:08 AM Go to last post
  2. 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: 5,026
    08-07-2013, 06:59 AM Go to last post
  3. 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: 2,354
    08-07-2013, 03:48 AM Go to last post
  4. 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: 1,837
    08-06-2013, 07:10 AM Go to last post
  5. 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: 3,812
    08-06-2013, 07:04 AM Go to last post
  6. 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: 9,356
    08-05-2013, 04:51 PM Go to last post
  7. 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: 1,648
    08-05-2013, 10:56 AM Go to last post
  8. 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: 8,570
    08-05-2013, 03:02 AM Go to last post
  9. 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: 2,464
    08-03-2013, 01:25 PM Go to last post
  10. 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: 4,342
    08-02-2013, 10:32 AM Go to last post
  11. 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: 2,560
    08-02-2013, 05:08 AM Go to last post
  12. 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: 2,029
    07-31-2013, 07:20 AM Go to last post
  13. 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: 1,438
    07-30-2013, 06:02 AM Go to last post
  14. 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: 1,953
    07-29-2013, 06:37 PM Go to last post
  15. 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: 1,832
    07-29-2013, 11:48 AM Go to last post
  16. 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: 1,418
    07-26-2013, 08:43 AM Go to last post
  17. 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: 7,281
    07-26-2013, 05:02 AM Go to last post
  18. 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: 1,521
    07-24-2013, 05:45 AM Go to last post
  19. 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: 1,712
    07-22-2013, 05:42 PM Go to last post
  20. 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: 2,008
    07-20-2013, 05:43 AM Go to last post
  21. 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: 1,424
    07-19-2013, 05:46 PM Go to last post
  22. 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: 1,841
    07-19-2013, 06:09 AM Go to last post
  23. 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: 3,042
    07-18-2013, 09:37 PM Go to last post
  24. 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: 2,527
    07-18-2013, 04:56 PM Go to last post
  25. 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: 4,064
    07-18-2013, 04:46 PM Go to last post
  26. 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: 1,419
    07-18-2013, 04:37 PM Go to last post
  27. 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: 2,692
    07-18-2013, 04:09 PM Go to last post
  28. 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
    • Replies: 2
    • Views: 2,277
    07-18-2013, 05:09 AM Go to last post
  29. 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: 2,881
    07-16-2013, 03:25 PM Go to last post
  30. 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: 6,377
    07-12-2013, 07:07 AM Go to last post
  31. 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: 1,748
    07-12-2013, 05:24 AM Go to last post
  32. 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: 3,740
    07-11-2013, 10:37 AM Go to last post
  33. 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: 1,633
    07-10-2013, 09:46 AM Go to last post
  34. 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
    • Replies: 0
    • Views: 1,993
    07-10-2013, 08:48 AM Go to last post
  35. 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: 1,767
    07-08-2013, 11:37 PM Go to last post
  36. 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: 2,121
    07-08-2013, 11:43 AM Go to last post
  37. 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: 900
    07-08-2013, 12:14 AM Go to last post
  38. 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: 1,561
    07-07-2013, 08:14 PM Go to last post
  39. 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: 2,254
    07-05-2013, 02:36 PM Go to last post
  40. 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: 5,133
    07-04-2013, 11:48 PM Go to last post
  41. 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: 1,231
    07-02-2013, 09:18 AM Go to last post
  42. 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: 4,470
    07-02-2013, 01:33 AM Go to last post
  43. 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: 2,601
    07-01-2013, 02:12 PM Go to last post
  44. 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: 1,152
    06-27-2013, 10:21 AM Go to last post
  45. 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: 1,427
    06-26-2013, 11:31 PM Go to last post
  46. 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: 2,146
    06-24-2013, 09:33 PM Go to last post
  47. 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: 6,544
    06-24-2013, 04:41 PM Go to last post
  48. 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
    • Replies: 12
    • Views: 4,245
    06-21-2013, 10:35 AM Go to last post
  49. 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: 3,594
    06-20-2013, 11:25 AM Go to last post
  50. 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: 1,717
    06-19-2013, 03:11 PM Go to last post
  51. 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: 1,274
    06-19-2013, 08:08 AM Go to last post
  52. Reduce already explained variance?

    Hello there, I am new to this forum and am very excited about it. Everyone here appears to be genuinely nice and talks about statistics. :) I...

    Started by MichaelT‎, 06-05-2013 12:33 AM
    • Replies: 1
    • Views: 1,141
    06-19-2013, 01:16 AM Go to last post
  53. Lightbulb Beauty Pageant Method of Analysis

    So, I was watching a beauty pageant last night (Miss USA) and I thought about stats. (I know, what's wrong with me?) What kind of analysis method...

    Started by JKru‎, 06-17-2013 09:22 PM
    • Replies: 3
    • Views: 3,427
    06-18-2013, 06:18 PM Go to last post
  54. Which test for this Music Perception data?

    Hi Everyone, I'm analysing to what extent a piece of music must be out of tune before people realise that it is so. Subjects were played one of...

    Started by JimRussell440‎, 06-12-2013 08:52 AM
    • Replies: 2
    • Views: 1,648
    06-18-2013, 01:52 PM Go to last post
  55. Bivariate Normal

    Suppose there are two ability tests, on which scores are normally distributed and correlated .7 with one another. Suppose that there's a criterion...

    Started by Cardano‎, 06-17-2013 04:23 PM
    • Replies: 2
    • Views: 1,771
    06-17-2013, 05:40 PM Go to last post
  56. What statistical test to use? Please help!

    I'm working on an assignment for my university stats course, and one of my questions presents me with a data set and asks me, of the continuous and...

    Started by ellenmichellen‎, 06-17-2013 01:29 AM
    • Replies: 1
    • Views: 1,336
    06-17-2013, 09:58 AM Go to last post
  57. what kind of regression tu use for competition results

    hi, we have botanical data and need to analyze this sort of scenario, in terms of students for the simplicity of explenation: we have a series of...

    Started by elalyg‎, 06-13-2013 03:20 AM
    • Replies: 5
    • Views: 2,500
    06-16-2013, 10:46 AM Go to last post
  58. How Do I Create a line graph for a three-way interaction with a continuous variable?

    I ran a 2 (Time 1, Time 2) X 2 (Prime Type: Secure, Neutral), X (Prime Technique: Implicit, Explicit) X Covariate (Anxiety) Mixed-Subjects ANOVA...

    Started by ToriMC11‎, 06-13-2013 09:16 PM
    graphing, three-way interaction
    • Replies: 1
    • Views: 7,665
    06-13-2013, 09:35 PM Go to last post
  59. Four way mixed design ANOVA / MANOVA Please help?

    In reference to the attached paper, I have been asked to comment on the use of a category of five anger groups in the four-way mixed design analysis...

    Started by MuddyOx‎, 06-10-2013 06:24 AM
    • Replies: 3
    • Views: 5,261
    06-12-2013, 02:39 AM Go to last post
  60. Help choosing a method of analyzing data.

    Ok so I need help trying to analyze my data. This isn't my experiment but it involves a similar situation which I'm using as an example. So lets...

    Started by dontcry‎, 05-30-2013 02:00 PM
    • Replies: 1
    • Views: 1,625
    06-09-2013, 07:18 AM Go to last post

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