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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: 30,839
    11-10-2005, 12:21 AM Go to last post
  1. Interaction between two causally related IVs

    I am interested in studying an interaction effect of two variables that have been shown to have a causal relationship by previous research. I am...

    Started by hemivar‎, 09-15-2013 12:48 AM
    • Replies: 2
    • Views: 1,537
    09-16-2013, 12:13 PM Go to last post
  2. Help! Repeated Measures ANOVA SPSS

    Context of study: 32 participants completed a self-esteem questionnaire (scores can go from 0-40). Then they are scanned in a fMRI so we can see...

    Started by kristall‎, 09-13-2013 11:46 PM
    anova, newbie, repeated measures, spss
    • Replies: 2
    • Views: 1,524
    09-14-2013, 01:09 PM Go to last post
  3. Question about model validation.

    I'm working on a problem on my own (not for class or work) and I just wanted to get some outside opinions before I progress further. As far as my...

    Started by dberma15‎, 09-12-2013 06:14 PM
    bayesian, data analysis, model validation, statistical methods
    • Replies: 0
    • Views: 1,303
    09-12-2013, 06:14 PM Go to last post
  4. Using T tests in a multimediational model

    I have used Andrew Hayes PROCESS to construct a multimediational model. Does anyone know if it is possible to run T tests to compare the strengths...

    Started by rosenmarsh‎, 09-11-2013 01:32 PM
    • Replies: 0
    • Views: 1,109
    09-11-2013, 01:32 PM Go to last post
  5. quasi experimental design

    HI, I/\'m doing a thesis on non-compliance in procurement looking at or trying to show that noncompliance is due to psychological and economical...

    Started by Tamzylou‎, 09-07-2013 06:51 AM
    • Replies: 2
    • Views: 1,606
    09-10-2013, 11:15 AM Go to last post
  6. Exclamation Thesis Statistics - - Outcome Known, but want to categorize Participant responses

    Hi! I am beginning the process of determining which statistical tests to use for my thesis research involving high school dropouts and their...

    Started by abruno‎, 09-09-2013 05:32 PM
    • Replies: 8
    • Views: 1,697
    09-09-2013, 08:21 PM Go to last post
  7. Outcome is Ranking Variable--What is the best test?

    Hi all, I am working with a dataset in which the outcome is a rank or an ordered variable. Essentially, participants are given some information...

    Started by eveisdawning‎, 09-09-2013 02:19 PM
    rank regression, ranks
    • Replies: 1
    • Views: 1,449
    09-09-2013, 03:17 PM Go to last post
  8. help

    hello im not really sure if im on the right thread but anyways i really need ur help, i am conducting a study about knowledge attitude and practice...

    Started by noobieta‎, 09-06-2013 09:05 AM
    • Replies: 2
    • Views: 1,081
    09-07-2013, 09:02 AM Go to last post
  9. psi matrix warning--is my cure worse than the malady?

    Hi all- I've been struggling with a psi matrix warning in my multiple indicator growth model for a few weeks. I found a tentative solution this...

    Started by MattH‎, 09-07-2013 07:56 AM
    • Replies: 0
    • Views: 1,315
    09-07-2013, 07:56 AM Go to last post
  10. Unhappy I need help with Inter-Rater agreement

    I'm developing a scale and my items were already checked by a group of 4 judges. They gave a dichotomica response (yes, leave the item or no,...

    Started by le.peppermint‎, 09-04-2013 06:42 PM
    interrater agreement, interrater reliability
    • Replies: 4
    • Views: 1,954
    09-06-2013, 09:46 AM Go to last post
  11. Is Mann Whitney test appropriate when N=1?

    Hello everyone, Im working on my phd (psychology), finished collecting data, now dealing with their analysis. I have a question regarding the...

    Started by Gianna‎, 09-02-2013 11:58 AM
    • Replies: 5
    • Views: 1,799
    09-04-2013, 09:45 AM Go to last post
  12. Ranges in survey questions

    I am working on some survey research. One of the questions is something like... This is how the colleague phrased the question but I know...

    Started by trinker‎, 09-02-2013 10:14 AM
    • Replies: 12
    • Views: 3,039
    09-02-2013, 05:45 PM Go to last post
  13. Paired t-Test: 7 means which do I compare?

    Hi, I've been running research trying to ascertain if retroactive priming is possible facilitated by Extra Sensory Perception. It is based on a...

    Started by cf156‎, 08-31-2013 02:29 PM
    • Replies: 0
    • Views: 1,428
    08-31-2013, 02:29 PM Go to last post
  14. Comparing two tests

    I was hoping someone could give me some advice on a stats homework assignment. Most of it is pretty easy but the last question (even though its...

    Started by balanar‎, 08-30-2013 09:24 AM
    • Replies: 0
    • Views: 1,081
    08-30-2013, 09:24 AM Go to last post
  15. Do I have a Type 1 or Type 2 error here?

    Ok, so.. I am testing the effectiveness of an intervention on work outcome variables, using MANOVAs. For one of my MANOVAs I have a significant...

    Started by Lolly‎, 08-27-2013 08:14 AM
    • Replies: 8
    • Views: 1,510
    08-28-2013, 03:51 PM Go to last post
  16. Testing Group Equivalence

    Hi, I am doing an intervention study for my thesis. I need to check that the control groups and experimental groups are equal at the outset on...

    Started by Lolly‎, 08-26-2013 05:35 PM
    • Replies: 3
    • Views: 1,295
    08-28-2013, 03:40 PM Go to last post
  17. Help with comparing stanines across groups

    I am trying to put together some stats on a simple questionnaire (10 items) administered to approx 200 respondents from 5 different organisations....

    Started by PeterGi‎, 08-20-2013 09:01 PM
    • Replies: 1
    • Views: 1,018
    08-28-2013, 09:01 AM Go to last post
  18. Choosing Scales and determing if difference between questions are significant

    Hi I'm pilot testing a survey on innovation. Survey objective is to find out whether the factors affecting innovation are present in a specific work...

    Started by cookydough‎, 08-02-2013 02:29 AM
    • Replies: 2
    • Views: 1,248
    08-28-2013, 01:18 AM Go to last post
  19. data transformation- varied result using log10- better method?

    To transform or not to transform and how to transform data? Hi, My study: - 2 groups- 1. Not allowed to work; 2. Allowed to work (control) -...

    Started by psy_vm‎, 08-26-2013 01:21 PM
    data transformation, normal distribution, psychology statistics, spss
    • Replies: 2
    • Views: 1,954
    08-27-2013, 03:42 PM Go to last post
  20. Quick question: When running an Independent Samples MANOVA...

    Where are the univariate output tables?!! I cant see any in SPSS (I am using Syntax). I had univariate outputs for my mixed MANOVAs, but I have...

    Started by Lolly‎, 08-26-2013 05:46 PM
    • Replies: 7
    • Views: 1,693
    08-27-2013, 08:07 AM Go to last post
  21. Chi Square Expected Count less than 5!

    Hi there, any help needed with my problem would be MUCH appreciated. I have a 2x7 design. Gender VS different treatment options. I did a...

    Started by statshelpneeded‎, 08-26-2013 11:14 AM
    • Replies: 6
    • Views: 11,222
    08-27-2013, 01:28 AM Go to last post
  22. need help with sample size

    Hi all-How do I calculate sample size for a one group repeated measures? I want to know how many subjects I need for a study looking at whether a...

    Started by norajones‎, 08-27-2013 01:01 AM
    • Replies: 0
    • Views: 1,731
    08-27-2013, 01:01 AM Go to last post
  23. Help needed with analyzing sensitivity to changes in Musical sounds

    Thank you so much for your advice in advance, I owe you a pint if you are in London! :) I am trying to analyze whether kids with autism are more...

    Started by icsgreen‎, 08-26-2013 10:18 AM
    change detection, music, perception, psychology, statistics
    • Replies: 1
    • Views: 1,452
    08-26-2013, 11:58 AM Go to last post
  24. Type I and type II errors in multiple factor ANOVA

    Hello, I wonder if someone can explain to me what happens with type I and type II errors as you add more factors to ANOVA design, specifically to...

    Started by dangor‎, 08-26-2013 08:17 AM
    anova, multivariate analysis, type 2 errors, type i error
    • Replies: 0
    • Views: 1,236
    08-26-2013, 08:17 AM Go to last post
  25. The importance of 'breaching zero' in a bootstrapping mediation Analysis

    Dear all, I am using mediation analaysis as part of my research and I am bit confused about the idea of 'breaching zero' in the confidence...

    Started by kaz‎, 08-25-2013 10:34 AM
    • Replies: 2
    • Views: 2,313
    08-25-2013, 11:22 AM Go to last post
  26. Exclamation is it possible to convert a pass or fail data into quantifiable data for thesis?

    our thesis is about personality factors affecting performance. and their performance is evaluated to either pass or fail only since its for a...

    Started by mikeecomendador‎, 08-11-2013 11:55 AM
    psychology, statistics, thesis
    • Replies: 9
    • Views: 2,657
    08-24-2013, 10:29 AM Go to last post
  27. T-test vs nonparametric for likert scale (very small sample size)

    Hi everyone, I'm in the process of completing my masters thesis, and while I did my share of psych stats in my undergrad it's been YEARS and I'm a...

    Started by romy‎, 08-24-2013 06:02 AM
    likert scale, nonparametric, parametric, small sample size
    • Replies: 1
    • Views: 2,372
    08-24-2013, 10:00 AM Go to last post
  28. how to calculate for unbalanced panel data Lagrange-multiplier test

    Hi, I have unbalanced panel data. Using SAS, the null hypthesis of Hausman Test was not rejected (means the random effects model is better than...

    Started by tantan‎, 04-24-2010 10:37 AM
    • Replies: 2
    • Views: 4,326
    08-23-2013, 12:00 PM Go to last post
  29. Smile Data transformation

    Hi all, I have used Fraley's ECR-RS with two subscales, one on attachment-related anxiety and the other on attachment-related avoidance to collect...

    Started by Brownie‎, 08-22-2013 01:46 AM
    • Replies: 3
    • Views: 1,939
    08-22-2013, 06:40 PM Go to last post
  30. Question Urgently need help with data analysis

    Hey folks, i really am desperate for help with this, since I have to present my results at a conference in less than two weeks. I am a...

    Started by Comfort Eagle‎, 08-21-2013 10:10 AM
    correlation, multiple regression, small sample size
    • Replies: 6
    • Views: 1,713
    08-22-2013, 09:42 AM Go to last post
  31. ANOVA question.. no interaction but significant main effect

    Okay.. here it goes.. i have two variables (A and B). A has 4 levels (A1,A2,A3,A4) B has 6 levels (B1, B2, B3, B4, B5, B6) In order to answer my...

    Started by chocolatesummer‎, 08-20-2013 04:56 PM
    • Replies: 2
    • Views: 1,464
    08-20-2013, 05:26 PM Go to last post
  32. Question nonparametric tests to check the effect of independent variable on dependent variable

    hi im hoping that some one might help me. i want to check the effect of metacognitive skills (MCS) on students presentation and report writing...

    Started by gksiddiqui‎, 08-18-2013 03:22 PM
    • Replies: 2
    • Views: 2,099
    08-18-2013, 05:25 PM Go to last post
  33. My supervisor got mad. I need help!

    She read a draft of my results and I have a million and one things to correct. I am running mixed MANOVAs on my intervention study data. But...

    Started by Lolly‎, 08-15-2013 04:58 PM
    • Replies: 11
    • Views: 2,234
    08-18-2013, 01:41 PM Go to last post
  34. Repeated Measures ANOVA : Intervention and control group problem

    Hi everyone, this is my first post and like many others I am a master student writing my thesis. I ran an experiment to test the impact of left...

    Started by Melkor‎, 08-17-2013 02:18 PM
    • Replies: 1
    • Views: 2,111
    08-18-2013, 11:40 AM Go to last post
  35. Likert scale with categories - chart to illustrate results

    Ho there, I am currently analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are grouped into several...

    Started by frederiquef‎, 08-18-2013 03:30 AM
    likert chart
    • Replies: 0
    • Views: 2,513
    08-18-2013, 03:30 AM Go to last post
  36. ANOVA and regression - "the same thing" but different sample size requirements?

    It is often said that ANOVA and regression are the same thing, and indeed the results are equivalent in the cases I've encountered thus far. So I...

    Started by noise‎, 08-16-2013 07:18 AM
    • Replies: 1
    • Views: 1,474
    08-16-2013, 07:39 AM Go to last post
  37. Reporting statistics in results section

    Hi, I'm writing the results section for an undergraduate report, and to my surprise, I haven't been able to find an answer to this ridiculously...

    Started by Phoenix91‎, 08-15-2013 09:46 PM
    • Replies: 4
    • Views: 1,787
    08-16-2013, 03:51 AM Go to last post
  38. MANOVA output- What does this mean?

    As I forgot to ask my supervisor yesterday. I have run a MANOVA on two DVs, and in the Multivariate Tests table it says that the main effects of...

    Started by Lolly‎, 08-06-2013 09:29 AM
    manova
    • Replies: 3
    • Views: 1,835
    08-15-2013, 04:53 PM Go to last post
  39. 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: 1,032
    08-15-2013, 04:58 AM Go to last post
  40. 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: 1,544
    08-14-2013, 01:26 PM Go to last post
  41. 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: 2,317
    08-14-2013, 08:34 AM Go to last post
  42. 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: 3,166
    08-14-2013, 03:47 AM Go to last post
  43. 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: 2,077
    08-13-2013, 02:08 PM Go to last post
  44. 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: 1,215
    08-13-2013, 12:05 PM Go to last post
  45. 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: 2,703
    08-12-2013, 04:17 PM Go to last post
  46. 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: 1,314
    08-10-2013, 07:51 AM Go to last post
  47. 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: 1,317
    08-10-2013, 05:06 AM Go to last post
  48. 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: 1,731
    08-08-2013, 11:08 AM Go to last post
  49. 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: 4,586
    08-07-2013, 06:59 AM Go to last post
  50. 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: 1,790
    08-07-2013, 03:48 AM Go to last post
  51. 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: 1,645
    08-06-2013, 07:10 AM Go to last post
  52. 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: 2,931
    08-06-2013, 07:04 AM Go to last post
  53. 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: 8,451
    08-05-2013, 04:51 PM Go to last post
  54. 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: 1,423
    08-05-2013, 10:56 AM Go to last post
  55. 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: 7,753
    08-05-2013, 03:02 AM Go to last post
  56. 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: 2,149
    08-03-2013, 01:25 PM Go to last post
  57. 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: 3,670
    08-02-2013, 10:32 AM Go to last post
  58. 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: 2,094
    08-02-2013, 05:08 AM Go to last post
  59. 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: 1,877
    07-31-2013, 07:20 AM Go to last post
  60. 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: 1,152
    07-30-2013, 06:02 AM Go to last post

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