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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: 32,186
    11-10-2005, 12:21 AM Go to last post
  1. Bayesian for dummies

    I saw this blog post: http://vasishth-statistics.blogspot.com/2013/10/new-course-on-bayesian-data-analysis.html And opened the notes on Bayesian...

    Started by trinker‎, 10-09-2013 08:51 AM
    • Replies: 0
    • Views: 2,834
    10-09-2013, 08:51 AM Go to last post
  2. Re-post: R, pwr: Proper test to determine multi-stage random sample size?

    Hello. Thanks for participating in this forum. I'm here to confirm or revise my plans for a multi-stage sample of an existing data set. ...

    Started by Binip‎, 10-08-2013 11:25 PM
    • Replies: 0
    • Views: 1,515
    10-08-2013, 11:25 PM Go to last post
  3. Eliminate effects of covariate for each item

    Hi, I hope that somebody can help me with my little stats problem in regard to my memory study. In my study, participants are tested for their...

    Started by Student1111‎, 10-08-2013 02:02 AM
    • Replies: 1
    • Views: 1,308
    10-08-2013, 08:34 PM Go to last post
  4. Interpreting time invariant covariate - repeated measures

    I conducted a 3 x 2 x 2 x 2 repeated measures ANOVA with 2 time invariant / between subjects covariates (research details below). While covariates...

    Started by RPS‎, 10-04-2013 07:14 PM
    • Replies: 0
    • Views: 2,468
    10-04-2013, 07:14 PM Go to last post
  5. Therapeutic Outcomes for a single group at 3 time points

    Hi, I would be very grateful for some advice because I am getting really confused! I have been collecting outcomes data (3 different...

    Started by AlexdPerry‎, 09-30-2013 06:17 AM
    anova, pre-post, single group, t-test
    • Replies: 1
    • Views: 1,674
    10-04-2013, 04:51 PM Go to last post
  6. Repeated measures ANOVA : problem with interpretation

    My repeted factor represents an effect of an antipsychotic drug on some quantitative variable measured in 5 time points. When that is the only factor...

    Started by Anchyboom‎, 10-04-2013 04:22 PM
    post hoc, repeated measures
    • Replies: 0
    • Views: 1,123
    10-04-2013, 04:22 PM Go to last post
  7. Unsure if what I am doing is OK... advice?

    Thanks I actually ended up doing something else. I just had to think things through.

    Started by eyeaye‎, 10-01-2013 03:47 PM
    • Replies: 1
    • Views: 1,321
    10-01-2013, 04:18 PM Go to last post
  8. post-hoc test after principal coordinate analysis

    Hello, I'm going to explore my dataset, composed by 100 subjects and 14 binary (1,0) variables. I was wondering if my protocol makes sense: ...

    Started by Marco777‎, 09-27-2013 06:30 AM
    binary data, discriminant analisys
    • Replies: 2
    • Views: 2,173
    09-27-2013, 10:18 AM Go to last post
  9. Three groups two linear regressions

    Hello friends,:wave: I am analyzing data that has three groups (type I treatment - the new treatment, type 2 treatment - is the "regular"...

    Started by Galit‎, 09-27-2013 05:31 AM
    • Replies: 0
    • Views: 1,351
    09-27-2013, 05:31 AM Go to last post
  10. Post-hoc Power, effect size for Chi-square

    I need help with my post-hoc power analysis, specifically the effect size: I measure children's successrate under four conditions. My dependent...

    Started by a_schaman‎, 09-25-2013 01:13 PM
    chi sq test, cohen's w, cramer's v, effect size, power
    • Replies: 0
    • Views: 3,837
    09-25-2013, 01:13 PM Go to last post
  11. Question About MANOVA (assumptions violated)

    Hi everyone, I am doing a research on demographical factors (e.g. family income, step family, gender etc.) and aggressiveness/delinquency of...

    Started by acchan‎, 09-22-2013 05:13 AM
    • Replies: 5
    • Views: 2,709
    09-24-2013, 02:43 AM Go to last post
  12. Research stats & power analysis

    Hi please could someone help as I am very confused and I'm sure the answer is very straight forwaard. I am doing a study looking at beliefs about...

    Started by Psy86‎, 09-16-2013 07:34 AM
    • Replies: 1
    • Views: 1,819
    09-24-2013, 01:09 AM Go to last post
  13. [SOLVED] Stats question..Please help!

    Need help with this question ASAP. It is very important. Fiona takes part in two different choice-reaction time tasks as part of her research...

    Started by AmJ‎, 09-23-2013 04:39 AM
    standard, statistics
    • Replies: 1
    • Views: 1,802
    09-23-2013, 06:12 AM Go to last post
  14. Singular correlation matrix problem

    I'm using principal components to reduce problem dimension. I obtain correlation matrix whose determinant is about 10^(-13) as the result of ...

    Started by kobylkinks‎, 08-04-2008 06:30 AM
    • Replies: 5
    • Views: 19,601
    09-20-2013, 12:46 AM Go to last post
  15. 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: 1,817
    09-16-2013, 12:13 PM Go to last post
  16. 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: 1,789
    09-14-2013, 01:09 PM Go to last post
  17. 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: 1,447
    09-12-2013, 06:14 PM Go to last post
  18. 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: 1,290
    09-11-2013, 01:32 PM Go to last post
  19. 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: 1,773
    09-10-2013, 11:15 AM Go to last post
  20. 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: 1,852
    09-09-2013, 08:21 PM Go to last post
  21. 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: 1,797
    09-09-2013, 03:17 PM Go to last post
  22. 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: 1,258
    09-07-2013, 09:02 AM Go to last post
  23. 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: 1,551
    09-07-2013, 07:56 AM Go to last post
  24. 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: 2,204
    09-06-2013, 09:46 AM Go to last post
  25. 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: 2,094
    09-04-2013, 09:45 AM Go to last post
  26. 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: 3,345
    09-02-2013, 05:45 PM Go to last post
  27. 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: 1,753
    08-31-2013, 02:29 PM Go to last post
  28. 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: 1,199
    08-30-2013, 09:24 AM Go to last post
  29. 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: 3,811
    08-28-2013, 03:51 PM Go to last post
  30. 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: 1,384
    08-28-2013, 03:40 PM Go to last post
  31. 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: 1,114
    08-28-2013, 09:01 AM Go to last post
  32. 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: 1,458
    08-28-2013, 01:18 AM Go to last post
  33. 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: 2,263
    08-27-2013, 03:42 PM Go to last post
  34. 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: 1,991
    08-27-2013, 08:07 AM Go to last post
  35. 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: 12,157
    08-27-2013, 01:28 AM Go to last post
  36. 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: 1,994
    08-27-2013, 01:01 AM Go to last post
  37. 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: 1,757
    08-26-2013, 11:58 AM Go to last post
  38. 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: 1,440
    08-26-2013, 08:17 AM Go to last post
  39. 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: 2,511
    08-25-2013, 11:22 AM Go to last post
  40. 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: 2,880
    08-24-2013, 10:29 AM Go to last post
  41. 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: 2,604
    08-24-2013, 10:00 AM Go to last post
  42. 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: 4,706
    08-23-2013, 12:00 PM Go to last post
  43. 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: 2,142
    08-22-2013, 06:40 PM Go to last post
  44. 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: 1,837
    08-22-2013, 09:42 AM Go to last post
  45. 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: 1,621
    08-20-2013, 05:26 PM Go to last post
  46. 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: 2,498
    08-18-2013, 05:25 PM Go to last post
  47. 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: 2,432
    08-18-2013, 01:41 PM Go to last post
  48. 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: 2,449
    08-18-2013, 11:40 AM Go to last post
  49. 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: 2,924
    08-18-2013, 03:30 AM Go to last post
  50. 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: 1,646
    08-16-2013, 07:39 AM Go to last post
  51. 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: 2,015
    08-16-2013, 03:51 AM Go to last post
  52. 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
    • Replies: 3
    • Views: 2,057
    08-15-2013, 04:53 PM Go to last post
  53. 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: 1,128
    08-15-2013, 04:58 AM Go to last post
  54. 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: 1,876
    08-14-2013, 01:26 PM Go to last post
  55. 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: 3,014
    08-14-2013, 08:34 AM Go to last post
  56. 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: 3,762
    08-14-2013, 03:47 AM Go to last post
  57. 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: 2,422
    08-13-2013, 02:08 PM Go to last post
  58. 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: 1,365
    08-13-2013, 12:05 PM Go to last post
  59. 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: 3,006
    08-12-2013, 04:17 PM Go to last post
  60. 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: 1,470
    08-10-2013, 07:51 AM Go to last post

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