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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: 28,698
    11-10-2005, 12:21 AM Go to last post
  1. 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: 1,094
    08-31-2013, 02:29 PM Go to last post
  2. 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: 867
    08-30-2013, 09:24 AM Go to last post
  3. 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: 1,295
    08-28-2013, 03:51 PM Go to last post
  4. 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: 1,084
    08-28-2013, 03:40 PM Go to last post
  5. 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: 861
    08-28-2013, 09:01 AM Go to last post
  6. 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: 987
    08-28-2013, 01:18 AM Go to last post
  7. 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: 1,610
    08-27-2013, 03:42 PM Go to last post
  8. 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: 1,359
    08-27-2013, 08:07 AM Go to last post
  9. 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: 10,139
    08-27-2013, 01:28 AM Go to last post
  10. 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: 1,319
    08-27-2013, 01:01 AM Go to last post
  11. 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: 1,032
    08-26-2013, 11:58 AM Go to last post
  12. 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: 984
    08-26-2013, 08:17 AM Go to last post
  13. 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: 1,958
    08-25-2013, 11:22 AM Go to last post
  14. 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: 2,352
    08-24-2013, 10:29 AM Go to last post
  15. 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: 1,901
    08-24-2013, 10:00 AM Go to last post
  16. 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: 3,897
    08-23-2013, 12:00 PM Go to last post
  17. 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: 1,623
    08-22-2013, 06:40 PM Go to last post
  18. 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: 1,460
    08-22-2013, 09:42 AM Go to last post
  19. 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: 1,216
    08-20-2013, 05:26 PM Go to last post
  20. 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: 1,669
    08-18-2013, 05:25 PM Go to last post
  21. 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: 1,917
    08-18-2013, 01:41 PM Go to last post
  22. 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: 1,762
    08-18-2013, 11:40 AM Go to last post
  23. 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: 1,965
    08-18-2013, 03:30 AM Go to last post
  24. 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: 1,202
    08-16-2013, 07:39 AM Go to last post
  25. 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: 1,391
    08-16-2013, 03:51 AM Go to last post
  26. 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: 1,537
    08-15-2013, 04:53 PM Go to last post
  27. 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: 847
    08-15-2013, 04:58 AM Go to last post
  28. 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: 1,180
    08-14-2013, 01:26 PM Go to last post
  29. 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: 1,684
    08-14-2013, 08:34 AM Go to last post
  30. 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: 2,504
    08-14-2013, 03:47 AM Go to last post
  31. 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: 1,630
    08-13-2013, 02:08 PM Go to last post
  32. 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: 1,030
    08-13-2013, 12:05 PM Go to last post
  33. 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: 2,299
    08-12-2013, 04:17 PM Go to last post
  34. 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: 1,146
    08-10-2013, 07:51 AM Go to last post
  35. 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: 1,043
    08-10-2013, 05:06 AM Go to last post
  36. 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: 1,380
    08-08-2013, 11:08 AM Go to last post
  37. 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: 3,970
    08-07-2013, 06:59 AM Go to last post
  38. 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: 1,296
    08-07-2013, 03:48 AM Go to last post
  39. 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: 1,316
    08-06-2013, 07:10 AM Go to last post
  40. 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: 2,225
    08-06-2013, 07:04 AM Go to last post
  41. 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: 7,497
    08-05-2013, 04:51 PM Go to last post
  42. 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: 1,185
    08-05-2013, 10:56 AM Go to last post
  43. 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: 6,731
    08-05-2013, 03:02 AM Go to last post
  44. 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: 1,823
    08-03-2013, 01:25 PM Go to last post
  45. 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: 2,944
    08-02-2013, 10:32 AM Go to last post
  46. 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: 1,598
    08-02-2013, 05:08 AM Go to last post
  47. 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: 1,652
    07-31-2013, 07:20 AM Go to last post
  48. 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: 827
    07-30-2013, 06:02 AM Go to last post
  49. 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: 1,320
    07-29-2013, 06:37 PM Go to last post
  50. 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: 1,241
    07-29-2013, 11:48 AM Go to last post
  51. 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: 975
    07-26-2013, 08:43 AM Go to last post
  52. 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: 6,182
    07-26-2013, 05:02 AM Go to last post
  53. 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: 1,143
    07-24-2013, 05:45 AM Go to last post
  54. 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: 1,422
    07-22-2013, 05:42 PM Go to last post
  55. 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: 1,440
    07-20-2013, 05:43 AM Go to last post
  56. 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: 1,125
    07-19-2013, 05:46 PM Go to last post
  57. 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: 1,363
    07-19-2013, 06:09 AM Go to last post
  58. 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: 2,414
    07-18-2013, 09:37 PM Go to last post
  59. 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: 1,736
    07-18-2013, 04:56 PM Go to last post
  60. 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: 3,078
    07-18-2013, 04:46 PM Go to last post

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