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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: 27,527
    11-10-2005, 12:21 AM Go to last post
  1. 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: 641
    07-08-2013, 12:14 AM Go to last post
  2. 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: 847
    07-07-2013, 08:14 PM Go to last post
  3. 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: 1,411
    07-05-2013, 02:36 PM Go to last post
  4. 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: 3,732
    07-04-2013, 11:48 PM Go to last post
  5. 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: 759
    07-02-2013, 09:18 AM Go to last post
  6. 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: 3,229
    07-02-2013, 01:33 AM Go to last post
  7. 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: 1,707
    07-01-2013, 02:12 PM Go to last post
  8. 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: 635
    06-27-2013, 10:21 AM Go to last post
  9. 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: 1,143
    06-26-2013, 11:31 PM Go to last post
  10. 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: 1,389
    06-24-2013, 09:33 PM Go to last post
  11. 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: 4,612
    06-24-2013, 04:41 PM Go to last post
  12. 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: 2,649
    06-21-2013, 10:35 AM Go to last post
  13. 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: 2,436
    06-20-2013, 11:25 AM Go to last post
  14. 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: 1,455
    06-19-2013, 03:11 PM Go to last post
  15. 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: 886
    06-19-2013, 08:08 AM Go to last post
  16. 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: 787
    06-19-2013, 01:16 AM Go to last post
  17. 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: 2,549
    06-18-2013, 06:18 PM Go to last post
  18. 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: 1,160
    06-18-2013, 01:52 PM Go to last post
  19. 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: 1,057
    06-17-2013, 05:40 PM Go to last post
  20. 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: 872
    06-17-2013, 09:58 AM Go to last post
  21. 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: 1,518
    06-16-2013, 10:46 AM Go to last post
  22. 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: 5,871
    06-13-2013, 09:35 PM Go to last post
  23. 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: 3,746
    06-12-2013, 02:39 AM Go to last post
  24. 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: 1,073
    06-09-2013, 07:18 AM Go to last post
  25. Question What statistical tools should I use?

    Dear Sir/Madam: I would like to know what statistics tools should I use in my research to test my hypothesizes and measure my variables? ...

    Started by wasel‎, 06-05-2013 06:26 AM
    • Replies: 3
    • Views: 1,824
    06-08-2013, 07:26 PM Go to last post
  26. categorical to numerical

    I have a dataframe that is of categorical value. How do I convert it to numerical value? Is there a built in function in r that does that? Or maybe...

    Started by Harry1789‎, 06-08-2013 05:06 AM
    • Replies: 4
    • Views: 1,387
    06-08-2013, 11:53 AM Go to last post
  27. Unhappy Factorial MANOVA

    Hi everyone I've collected some data which, to me at least, represents a 2x3 between groups design. By this I mean I have two conditions which...

    Started by Renzakuken‎, 06-07-2013 07:40 AM
    • Replies: 0
    • Views: 2,222
    06-07-2013, 07:40 AM Go to last post
  28. Use of extracted factors from EFA with Mancova in SPSS

    For a 2x2 between subjects factorial analysis, I need to test interaction effects of 2 IVs each having 2 levels. The questionnaire has multiple items...

    Started by elik‎, 06-05-2013 05:12 AM
    factor analysis, mancova, manova
    • Replies: 0
    • Views: 890
    06-05-2013, 05:12 AM Go to last post
  29. HELP! Factor Analysis theory and algebra!! :(

    Dear talkstats board members, Hello! I am having some trouble in my class on Factor Analysis/Structural Equation Modeling. There is this one...

    Started by amanda01‎, 05-29-2013 11:48 AM
    • Replies: 6
    • Views: 1,779
    06-03-2013, 09:15 PM Go to last post
  30. In need of odds ratio explanation please!

    Can someone please explain to me what a good odds ration is and why? Thanks!

    Started by Leona9987‎, 05-14-2013 06:38 AM
    • Replies: 6
    • Views: 4,245
    05-31-2013, 03:00 PM Go to last post
  31. HELP needed with ANOVA!

    Hi everyone, I am a complete beginner at statistics so please forgive my confusion! I have gave participants a questionnaire to access whether...

    Started by Leanne‎, 05-29-2013 02:35 PM
    • Replies: 6
    • Views: 1,309
    05-31-2013, 07:15 AM Go to last post
  32. Question 2x2x3 ANOVA interaction and error term formulas?

    Hey guys, I would really appreciate some help with some ANOVA formulas. :) So I'm running a 2 (between) by 2 (between) by 3 (within) design and I...

    Started by Suede‎, 05-30-2013 09:28 AM
    anova, interaction, split-plot
    • Replies: 0
    • Views: 2,043
    05-30-2013, 09:28 AM Go to last post
  33. Negative combach's alfa in evidence based questionnaire

    Hey everyone, For a small research I had to do I used the Rosenberg Self-esteem scale and tried to look for correlations with aggression using the...

    Started by GentlemanA‎, 05-24-2013 02:27 PM
    cronbach's alpha
    • Replies: 8
    • Views: 2,279
    05-29-2013, 11:07 AM Go to last post
  34. Variance of combined normally distributed scores

    I'm trying to compute a average score of several normally distributed weighted variables. To make myself easy, I'm using z-scores. The weights are X1...

    Started by fraatsr‎, 04-23-2013 11:08 AM
    • Replies: 1
    • Views: 2,511
    05-28-2013, 05:36 PM Go to last post
  35. please help me

    Hey Guys I kind of need help with these questions would really appreciate it 1.)When the assumption of sphericity is violated, correction...

    Started by kavi‎, 05-28-2013 02:08 AM
    • Replies: 1
    • Views: 824
    05-28-2013, 02:35 AM Go to last post
  36. Mixed models, Repeated Measures, multiple DVs, SPSS- help!

    Hi there, My data is approximately as follows: 400 participants split over 2 interventions. The participants are school students from 14...

    Started by lir6777‎, 05-27-2013 05:42 AM
    mixed models
    • Replies: 0
    • Views: 1,520
    05-27-2013, 05:42 AM Go to last post
  37. Within-subject comparison

    I randomly exposed subjects (students) to one of two experimental conditions before each of four exams, with their exam performance as the dependent...

    Started by Phoenix123‎, 05-25-2013 06:35 AM
    • Replies: 0
    • Views: 1,483
    05-25-2013, 06:35 AM Go to last post
  38. Can I use a two way repeated measures ANOVA?

    Hi, I'm doing an acoustic experiment where I have the same 10 subjects listening to/undergoing 18 different conditions. I have 3 independent...

    Started by mAcA‎, 05-24-2013 01:39 PM
    • Replies: 0
    • Views: 792
    05-24-2013, 01:39 PM Go to last post
  39. omega squared as effect size measure in repeated measure ANCOVA

    Hi, I would like to report the effects size for a repeated measure ANCOVA. Instead of the eta squared it seems that the omega squared is more...

    Started by Flavia‎, 05-24-2013 05:19 AM
    • Replies: 0
    • Views: 1,563
    05-24-2013, 05:19 AM Go to last post
  40. Main effects in factorial ANOVA

    Hello helpful people, I'm doing my comps exam and I have an issue determining what constitutes a main effect in my design. I will conduct a 3x3...

    Started by navigo‎, 05-22-2013 08:41 PM
    • Replies: 1
    • Views: 1,342
    05-23-2013, 07:31 AM Go to last post
  41. Paired-sample or Independent T-test?

    Hi, I have read all of the examples available but I can't tell which test to use because none of the examples use the kind data that I do! Please...

    Started by codma269‎, 05-22-2013 04:45 AM
    -test, archaeology, independent
    • Replies: 1
    • Views: 1,154
    05-22-2013, 06:34 AM Go to last post
  42. Question Performing Pearson Correlation On Multiple (more than 2) Variables

    Greetings all, I am struggling with finding out the Pearson's coefficient when there are more than 2 variables, and would welcome any assistance...

    Started by billcurtis‎, 12-13-2008 06:25 AM
    • Replies: 8
    • Views: 61,207
    05-22-2013, 05:09 AM Go to last post
  43. Help in categorizing data

    Hi, I am working on my dissertation and am stuck with the data analysis. :confused: I am dealing with 4 variables, all of which are categorical...

    Started by natashaakaul‎, 05-15-2013 04:32 AM
    categorical data, categorical dependent, categorical predictors
    • Replies: 1
    • Views: 1,244
    05-21-2013, 11:26 PM Go to last post
  44. Using PCA Components in K-Means Cluster

    I put this here because I didn't think this was necessarily an SPSS specific question, forgive me if I chose the wrong forum. I had a very large...

    Started by lifeafter2am‎, 05-13-2013 10:10 AM
    • Replies: 1
    • Views: 1,284
    05-21-2013, 11:21 PM Go to last post
  45. Repeated measures ANOVA or multilevel modeling

    Hi everyone, I have collected questionnaire data from a group of 20 trainees and their 20 supervisors on a construct called professionalism (25...

    Started by jamie157‎, 05-21-2013 05:13 AM
    • Replies: 4
    • Views: 2,016
    05-21-2013, 04:15 PM Go to last post
  46. Structured equational modelling in multimediational analysis

    Hi Everybody I am currently writing up my results regarding mediators between insecure attachment and depression. I have used Andrew Hayes...

    Started by rosenmarsh‎, 05-21-2013 12:37 PM
    • Replies: 0
    • Views: 698
    05-21-2013, 12:37 PM Go to last post
  47. Does it matter whether the same construct is measured differently for different pp's?

    Hi all, I am doing a multiple regresssion analysis with several temperament scales, birth order (firstborn(age =4) or secondborn(age=2) and...

    Started by Julia91‎, 05-21-2013 08:16 AM
    cbq, early cbq, same construct
    • Replies: 0
    • Views: 785
    05-21-2013, 08:16 AM Go to last post
  48. Is it ok to run some planned comparisons and some post hoc?

    Hello - I am a phd student in psychology and I would be very grateful for some advice about contrasts. I have conducted a naming experiment for...

    Started by Esme‎, 05-20-2013 01:29 PM
    mixed anova, planned comparisons, post hoc test, repeated measures anova
    • Replies: 3
    • Views: 1,630
    05-20-2013, 05:40 PM Go to last post
  49. Controlling for type-1 error

    We have conducted an experiment that asks respondents to rate whether they thought an article was biased on an 11-point scale, with 0 being biased to...

    Started by dwise75‎, 05-16-2013 11:23 AM
    multiple comparisons, t-tests
    • Replies: 1
    • Views: 850
    05-16-2013, 12:08 PM Go to last post
  50. Statistical methods for comparing trend lines? Need help with search terms.

    Hello, I'm analyzing the results of an educational research study wherein learners had the opportunity to conduct multiple attempts (trials) at a...

    Started by ReluctantStatistician‎, 05-14-2013 07:40 AM
    differencing, lag, time series
    • Replies: 1
    • Views: 3,671
    05-14-2013, 08:30 AM Go to last post
  51. Interaction in 2X2 ANOVA: How to interpret simple effects

    In a 2x2 ANOVA I found a main effect for 1 IV and an interaction effect. I conducted a post hoc simple effects test by using paired sample t-tests...

    Started by Liz004‎, 05-13-2013 08:33 AM
    • Replies: 0
    • Views: 2,244
    05-13-2013, 08:33 AM Go to last post
  52. DIF analyses in multidimensional IRT

    Hello everyone, I am currently using IRTPro to assess the presence of DIF on a 5-dimension scale (1 general dimension, 4 subscales). It is a graded...

    Started by gradstudent11‎, 05-09-2013 11:34 PM
    • Replies: 4
    • Views: 1,896
    05-12-2013, 12:09 AM Go to last post
  53. When group sizes are not a problem in bootstrapped ANCOVA?

    Hi, I have three groups (defined by paranoid ideation level). I am running bootstrapped One Way ANCOVAs due to non-normality (expected for paranoia...

    Started by Demlo‎, 05-11-2013 09:51 AM
    • Replies: 0
    • Views: 821
    05-11-2013, 09:51 AM Go to last post
  54. How to start on data analisys

    Hey, i am new here and i would like get some advices to start on data analisys field. I study computing engineer and i work as programmer. For my...

    Started by bipe15‎, 05-09-2013 03:58 PM
    analisys, data, start
    • Replies: 6
    • Views: 1,446
    05-10-2013, 02:06 PM Go to last post
  55. Post About CFA in AMOS

    I ran CFA in AMOS, which is a second order confirmatory factor analysis. When I read the result, I found that the standardised regression weights...

    Started by Terence‎, 05-10-2013 02:02 AM
    • Replies: 0
    • Views: 1,878
    05-10-2013, 02:02 AM Go to last post
  56. confusing tests for the significance of two IVs

    Hey people, Im doing a report on the results of a memory recognition study. The experiment involves 178 students being shown a list of 30...

    Started by JesseJames‎, 05-07-2013 11:30 PM
    • Replies: 2
    • Views: 903
    05-08-2013, 02:59 AM Go to last post
  57. Help with SPSS and which analyses?

    Hiya, since posting I've sorted it all out! Thanks for your help x

    Started by grrriddle‎, 05-07-2013 03:02 PM
    • Replies: 1
    • Views: 870
    05-07-2013, 04:49 PM Go to last post
  58. Help with statistical analyses with only small sample size and multiple DV's??

    I am looking at the relationship between Schizophrenia, Substance Abuse and Neurocognition. I have 30 P's with Schizophrenia and 30...

    Started by Grace‎, 05-05-2013 02:07 AM
    manova, matched-controls, multiple dv's, neurocognition, small sample size
    • Replies: 2
    • Views: 1,582
    05-06-2013, 09:09 PM Go to last post
  59. EFA assumptions and related diagnostics

    What are the critical assumptions for EFA and how do you test for them? Here are two examples of the questions I have on this. First, some warn of...

    Started by noetsi‎, 05-06-2013 02:17 PM
    • Replies: 1
    • Views: 2,607
    05-06-2013, 06:33 PM Go to last post
  60. Conducted Experiment, Need Help Deciding Which T test to run, how to execute it.

    I'm in an introductory research class at my college and have ran a basic experiment testing for word recall ability when using gender associated...

    Started by Josh1232‎, 05-05-2013 05:26 PM
    • Replies: 1
    • Views: 1,232
    05-06-2013, 01:52 AM Go to last post

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