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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: 21,242
    11-10-2005, 12:21 AM Go to last post
  1. WANTED: statistical basis for subtest weighting

    Hello everyone, I am planning my Master thesis project in Neuropsychology and I am currently facing a statistical/mathematical challenge. ...

    Started by SophieF‎, 02-25-2013 10:00 AM
    diagnosis, sensitivity, testing, weights
    • Replies: 0
    • Views: 413
    02-25-2013, 10:00 AM Go to last post
  2. A desperate call for help

    Hi, I am working on my psychology project and struggling big time with stats. If some lovely person could have a quick look at what I have done...

    Started by melissa88‎, 02-23-2013 08:12 AM
    • Replies: 1
    • Views: 448
    02-23-2013, 11:08 AM Go to last post
  3. Do I need to nomralize samples or not. frequecies differ but Point biserial looks ok

    I am conducting a study of how supervisors would rate an ideal job candidate in a particular industry on the HEXAC-PI. I have N=94 (males=63,...

    Started by statdane‎, 02-22-2013 03:24 PM
    • Replies: 2
    • Views: 479
    02-23-2013, 07:51 AM Go to last post
  4. power analysis repeated measures anova

    Hello, I am trying to do a power analyse to estimate how many participants are necessary for a replication. The analysis is a repeated measures...

    Started by Hfly‎, 02-21-2013 04:17 PM
    • Replies: 2
    • Views: 2,333
    02-21-2013, 05:18 PM Go to last post
  5. Which ANOVA to use

    Difference between two-way ANOVA and repeated measures ANOVA?

    Started by emilywidnall‎, 02-18-2013 12:20 PM
    • Replies: 1
    • Views: 477
    02-20-2013, 09:31 PM Go to last post
  6. Factor Analysis Question

    I have 41 variables measured on a four point likert scale (they are ordinal at least). I have 809 subjects in the test. Since multicolinearity (MC)...

    Started by noetsi‎, 02-20-2013 05:49 PM
    • Replies: 2
    • Views: 560
    02-20-2013, 06:57 PM Go to last post
  7. Testing interaction of two continuous predictors with ANCOVA - Help

    Hi, I’m a PhD student working on my thesis and having a bit of a dilemma on how to test the interaction of two continuous predictors. My design...

    Started by darc‎, 11-12-2009 06:09 AM
    • Replies: 3
    • Views: 3,889
    02-20-2013, 06:41 PM Go to last post
  8. Examining whether a repeated measure is stable high, or non-stable over time

    Dear all, I have conducted an experiment with a patient versus a control group, in which I asked them to do a reaction time tasks with control...

    Started by Esmee2000‎, 02-20-2013 03:38 PM
    crosslaged panel design, longitudinal design, repeated measures, stability, structural equation model
    • Replies: 0
    • Views: 426
    02-20-2013, 03:38 PM Go to last post
  9. Confirmatory factor analysis

    Hi there, I have had some reviewer comments back on a manuscript and I'm not sure how to respond: 1. Purpose of the study = development and...

    Started by njt14‎, 02-20-2013 11:56 AM
    • Replies: 3
    • Views: 535
    02-20-2013, 02:23 PM Go to last post
  10. Correspondence Analysis: What to report

    I'm writing up an output for a correspondence analysis run on SPSS and would very much appreciate some guidance. I am going to report the...

    Started by stats-student‎, 02-17-2013 02:47 PM
    • Replies: 7
    • Views: 2,466
    02-18-2013, 05:35 PM Go to last post
  11. Query regarding multiple comparisons

    When you perform a permutation test on a two-factor within-subject repeated measures ANOVA, how should you relabel the category information? For...

    Started by tv2012‎, 02-18-2013 01:00 PM
    anova, permutation test
    • Replies: 0
    • Views: 457
    02-18-2013, 01:00 PM Go to last post
  12. Query regarding linearity assumption in Binary Logistic Regression

    I have modelled a logistic regression analysis which includes the combination of categorical and continous explanatory variables. My understanding...

    Started by Collinsbex‎, 02-13-2013 11:07 AM
    • Replies: 1
    • Views: 2,003
    02-15-2013, 02:23 PM Go to last post
  13. Urgent stats help! Multiple comparisons?

    Hello, I just have a quick question understanding multiple comparisons and I'd appreciate any help because I'm on the verge of failing :( I'm...

    Started by ellenmichellen‎, 02-11-2013 12:46 PM
    • Replies: 7
    • Views: 1,061
    02-12-2013, 08:19 PM Go to last post
  14. Checking the normality of residuals - 2x2 mixed ANOVA (spss)

    Hi there, I've come across advice from various sources that when assessing the assumption of normality before deciding whether it is appropriate...

    Started by freofan‎, 02-11-2013 11:48 PM
    • Replies: 0
    • Views: 2,173
    02-11-2013, 11:48 PM Go to last post
  15. 2x2 mixed ANOVA - significant interaction with non significant follow up tests?

    Hi, I've run a study where high and low trait anxious participants were presented with 2 types of material (lets called 'social' and 'physical')...

    Started by freofan‎, 02-11-2013 11:31 PM
    • Replies: 0
    • Views: 1,361
    02-11-2013, 11:31 PM Go to last post
  16. I cannot find the independent variable from my research question

    Basically i know that dependent variable is the one we measure and independent is the one we manipulate, therefore my research question is ''The...

    Started by Izzabel89‎, 02-09-2013 09:27 PM
    • Replies: 8
    • Views: 1,590
    02-11-2013, 04:58 PM Go to last post
  17. Multiple Imputation for missing data

    Hello, I've been doing some reading of articles on multiple imputation but haven't found my question directly addressed. I am doing correlational...

    Started by PikeyJM‎, 02-11-2013 02:27 PM
    • Replies: 3
    • Views: 1,000
    02-11-2013, 04:37 PM Go to last post
  18. Analysising the relationship between team ID and Brand Recall

    Hi all. I have conducted some research into the impact that team identification has upon brand recall from an international sports event. The...

    Started by Student3291‎, 02-08-2013 06:18 AM
    • Replies: 2
    • Views: 710
    02-11-2013, 07:21 AM Go to last post
  19. Please help me with non-parametric tests

    I'm studying for an upcoming test in my advanced statistics course, and I was wondering if anyone could help me understand how to conduct a post hoc...

    Started by ellenmichellen‎, 02-04-2013 10:51 PM
    • Replies: 7
    • Views: 1,214
    02-10-2013, 10:33 PM Go to last post
  20. Question mediation results - using two methods - problem explaining how mediation can be 100%

    Greetings - I completed mediation statistical calculations using the Preacher (manual) and Jose (online calculator to identify level of significance...

    Started by amirzand‎, 01-27-2013 01:25 AM
    • Replies: 1
    • Views: 1,163
    02-09-2013, 02:51 AM Go to last post
  21. Correlational Question

    I have a study where participants completed a number of DV measurements before and after a psychological intervention. I am attempting to ascertain...

    Started by Laf‎, 02-08-2013 06:17 PM
    • Replies: 1
    • Views: 665
    02-08-2013, 07:10 PM Go to last post
  22. Mixed model, repeated measures ANOVA, SPSS

    Hi everyone :), I have a data set that consists of 16 participants, running an experiment twice each, using different stimulus sets each time. I...

    Started by louiserc‎, 02-08-2013 09:15 AM
    anova, data entry, repeated measures anova, spss
    • Replies: 0
    • Views: 821
    02-08-2013, 09:15 AM Go to last post
  23. Help with which spss test to use

    Can anybody please help me I am going out of my mind trying to figure out which spss test to use!, its for my dissertation, im in my final year of a...

    Started by 137‎, 02-07-2013 12:52 PM
    • Replies: 1
    • Views: 729
    02-08-2013, 04:00 AM Go to last post
  24. Spearman-Brown

    Hi guys, I know this might sound a little basic, but I am having trouble understanding the Spearman-Brown stepped-up reliability correlation. Does it...

    Started by JoshMikes‎, 02-07-2013 12:50 PM
    • Replies: 1
    • Views: 3,373
    02-07-2013, 02:47 PM Go to last post
  25. Test-retest reliability - Interpretation of results

    Hi everyone! :wave: Context. I have a database where coping strategies were assessed with a certain questionnaire and re-assessed some time later....

    Started by Mase‎, 02-06-2013 07:22 AM
    • Replies: 5
    • Views: 3,693
    02-06-2013, 03:50 PM Go to last post
  26. Comparing Percentages In Unequal Groups

    Hello, and thanks for having a look! I'm running an experiment looking at recognition of pictures using a 2x5 design. In the first round...

    Started by kevinteoh‎, 02-04-2013 09:51 AM
    • Replies: 2
    • Views: 1,085
    02-06-2013, 05:10 AM Go to last post
  27. Unhappy The significance test

    Hello. Can someone kindly explain what Significance Test is and can he/she give me a practical step by step example with stats involved ? I tried...

    Started by uwritetherules‎, 02-04-2013 07:37 AM
    • Replies: 3
    • Views: 635
    02-05-2013, 01:35 PM Go to last post
  28. Non-positive definite matrix and second order confirmatory factor analysis

    For my research I'm using SEM to model the relation between a couple of variables. All scales have been used in a 7 point likert format and most have...

    Started by MrJP‎, 02-05-2013 11:18 AM
    factoranalysis, positive_definite, second order model, structural equation model
    • Replies: 0
    • Views: 1,230
    02-05-2013, 11:18 AM Go to last post
  29. Pre- and post-test comparison, is there a minimum sample size (behaviour change treat

    Hi I have to measure the efficacy of a group based treatment for the perpetrators of domestic violence. I started out trying to organise an rct,...

    Started by no eye dear‎, 01-30-2013 01:51 PM
    pre post test analysis, social science
    • Replies: 5
    • Views: 3,756
    01-30-2013, 04:36 PM Go to last post
  30. Query about using clustered regression in STATA

    Hello, I am working with a large dataset of young people. The data comes from a household survey, so young people are nested within households....

    Started by pjtaylor‎, 01-30-2013 05:57 AM
    • Replies: 0
    • Views: 845
    01-30-2013, 05:57 AM Go to last post
  31. Mediation and Causality? What is The deal?

    Hello Friends I am approaching my defense and the stress in building up. I have done a mediation analysis and am reading al ot about "Mediation does...

    Started by sampier85‎, 01-10-2013 02:22 PM
    • Replies: 9
    • Views: 2,158
    01-29-2013, 03:23 PM Go to last post
  32. Copy of 9th edition chapter review problems Basic Statistical Analysis Sprinthall

    I need chapter 12 14 and 16 end of chapter questions, if anyone has this book it would be helpful thanks

    Started by Caseboma‎, 01-29-2013 12:07 PM
    • Replies: 0
    • Views: 1,266
    01-29-2013, 12:07 PM Go to last post
  33. How do you choose the appropriate statistic?

    Hi all: I am having issues analyzing my data. I know, I know, it shows my lack of research design skills. I have a data set of 3,000 responses to...

    Started by applelady‎, 07-27-2007 10:07 AM
    • Replies: 7
    • Views: 3,390
    01-28-2013, 01:34 PM Go to last post
  34. Question Family-wise error rate in T test and ANOVA

    I'm using one psychological questionnaire that consists of 3 sub scales. As part of the data analysis, I want to carry out 2 Independent sample T...

    Started by artibg‎, 01-28-2013 07:56 AM
    anova, familywise error, t test
    • Replies: 0
    • Views: 1,938
    01-28-2013, 07:56 AM Go to last post
  35. Urgent! Please help

    Hi everyone, I have carried out a research and when it comes to the stats part I am not sure which test should I use.:( My research topic, IVs,...

    Started by Koey‎, 01-27-2013 05:38 PM
    • Replies: 2
    • Views: 592
    01-27-2013, 10:18 PM Go to last post
  36. very urgent plz help me: Interaction is significant but posthoc is not significant

    I'm running ANOVA with a 3 groups x 2 (Time: pretest, posttest) and a 2 groups x 3 (Time: pretest, posttest, follow-up) repeated measures design. In...

    Started by shiva‎, 01-18-2013 06:22 PM
    • Replies: 2
    • Views: 1,045
    01-22-2013, 10:55 AM Go to last post
  37. Complex comparison of dependent effect sizes

    Hi everyone, I am new to this forum, and still figuring out how to navigate the site. So, I apologize if this question has already been asked. ...

    Started by AlanT‎, 01-21-2013 02:53 PM
    comparing, dependent, effect sizes, meng
    • Replies: 0
    • Views: 736
    01-21-2013, 02:53 PM Go to last post
  38. Urgent: ANCOVA Analysis for Nested Design

    In an experimental study, 210 students were randomly assigned into 6 sections, out of which 2 sections were treated as experimental group 1 subjected...

    Started by statanx‎, 01-16-2013 03:56 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,066
    01-18-2013, 09:52 AM Go to last post
  39. Post-hoc is not significant but significant F for interaction time by group

    I'm running an ANOVA repeated measure 2 group x3 time: pretest, posttest, follow-up, I have a significant F for interaction time by group, for six...

    Started by shiva‎, 01-17-2013 06:31 PM
    • Replies: 0
    • Views: 732
    01-17-2013, 06:31 PM Go to last post
  40. Smile What is the difference between statistical significance (based on probability) and...

    (Questions wouldn't fit) What is the difference between statistical significance (based on probability) and an effect size? I am fairly new to...

    Started by Kurisu87‎, 01-03-2013 09:09 PM
    effect size, statistical significance
    • Replies: 4
    • Views: 2,894
    01-17-2013, 12:07 PM Go to last post
  41. SEM: combining binary & ordinal variables

    In my research I surveyed participants after they had used a website. I have 28 items which related 8 different concepts. Which means I have 8 latent...

    Started by MrJP‎, 01-17-2013 08:43 AM
    dichotomous, likert scale, ordinal data, structural equation model
    • Replies: 0
    • Views: 1,475
    01-17-2013, 08:43 AM Go to last post
  42. Use of Mcnemar test for dichotomous IV vs. dichotomous DV: how pertinent is it?

    I intend to study the effect of a given psychological intervention (dichotomous independent variable) on the compliance of a medical treatment...

    Started by joaomachadovaz‎, 01-11-2013 01:10 PM
    mcnemar, mcnemar's
    • Replies: 0
    • Views: 878
    01-11-2013, 01:10 PM Go to last post
  43. Odd thing happening in linear regression when I enter my predictors...can you help?

    Hello friends This may sound like a total rookie question but please if you could help me better understand this. I am performing a linear...

    Started by sampier85‎, 01-07-2013 04:03 PM
    depression, linear regression, psychology
    • Replies: 3
    • Views: 853
    01-09-2013, 06:09 PM Go to last post
  44. Smile How to determine if a conclusion is justified?

    Hi All I'm new to statistics and have a little query; I have been given a scenario, by which an experimenter allocated participants to a...

    Started by Kurisu87‎, 01-09-2013 08:23 AM
    • Replies: 3
    • Views: 4,665
    01-09-2013, 05:56 PM Go to last post
  45. How to call ltm function using rpy package in python

    I am trying the following code-- from rpy import * r.library("ltm") dat= #some data frame or matrix r.ltm(r('dat~z1')) error coming is---...

    Started by mohit_ahead‎, 01-08-2013 05:19 AM
    python rpy ltm
    • Replies: 1
    • Views: 736
    01-08-2013, 06:35 AM Go to last post
  46. Hypothesis testing of two data series

    Hi, I am new to this forum. :wave: I have a basic understanding of statistics from a module at university. I am currently pursuing research in...

    Started by tomasz.bulinski@gmail.com‎, 01-06-2013 10:31 AM
    hypothesis testing, management research, mba
    • Replies: 0
    • Views: 693
    01-06-2013, 10:31 AM Go to last post
  47. Mediation without hypothesizing a direct effect

    I know the current view (contrary to Baron & Kenny) is that you do not need to find a significant direct effect to test for mediation (e.g., Shrout &...

    Started by jasjones‎, 01-05-2013 12:53 PM
    direct effects, indirect effects, mediation
    • Replies: 0
    • Views: 1,110
    01-05-2013, 12:53 PM Go to last post
  48. Difference between CFA latent factor intercorrelation and Pearson correlation coeffic

    Hello, I've used SEM to run CFA on a scale that includes 22 items and 4 latent factors. Factors 1-3 have 6 items each and the fourth factor has 4...

    Started by lynngaut‎, 01-03-2013 05:12 PM
    • Replies: 0
    • Views: 1,281
    01-03-2013, 05:12 PM Go to last post
  49. deciding which form of ANOVA to use

    Hi there, I am struggling to choose which form of ANOVA to use for a problem I have. there is a court case where participants have to decide...

    Started by gooner8‎, 12-12-2012 06:41 AM
    anova
    • Replies: 3
    • Views: 1,562
    12-22-2012, 03:35 PM Go to last post
  50. CFA and SEM goodness fit indices the same?

    I am using AMOS to fit a structural equation model. Before doing so, however, I would like to perform a confirmatory factor analysis, which I have...

    Started by jesse‎, 12-20-2012 09:24 AM
    cfa, goodness of fit, sem
    • Replies: 0
    • Views: 1,379
    12-20-2012, 09:24 AM Go to last post
  51. Data transformation or Spearman/Polychoric correlations?

    When conducting a factor analysis (or other types of analyses in general), one usually recommends to transform non-normal variables. Since however...

    Started by ImEngine‎, 12-18-2012 08:43 AM
    • Replies: 2
    • Views: 1,495
    12-20-2012, 03:21 AM Go to last post
  52. ANOVA or ANCOVA???

    In a QUASI-EXPERIMENTAL PRE-POST TEST STUDY (factorial design 3x2, instructional method x gender), 6 intact classes were taken & 2 instructors were...

    Started by statanx‎, 12-18-2012 01:39 PM
    • Replies: 5
    • Views: 1,501
    12-20-2012, 01:35 AM Go to last post
  53. Binomial Distribution, signal detection theory?

    Dear all, Please consider the following problem: In a psychological experiment participants are asked to intuitively decide if visual stimuli,...

    Started by PsyCog‎, 12-18-2012 04:27 AM
    "detection" "binomial"
    • Replies: 0
    • Views: 1,022
    12-18-2012, 04:27 AM Go to last post
  54. [One-Way-Anova] and [Paired-Samples T Test] in combination with [Nested Data]

    Dear Users, I am running into an interesting case regarding nested data with some experiment data I gathered. In the experiment 12 users with 3...

    Started by Kirederf‎, 12-17-2012 09:59 AM
    • Replies: 0
    • Views: 1,185
    12-17-2012, 09:59 AM Go to last post
  55. What happens to the shape of an S curve when ...

    ... initial data indicate a success rate of 50%? I expected an S curve, but got what appears to be the upper half of an S curve with data ranging...

    Started by dubina‎, 12-13-2012 04:53 PM
    • Replies: 6
    • Views: 1,129
    12-16-2012, 08:11 AM Go to last post
  56. Calculation of Levene's Robust Test of Equality of Variances (not in SPSS!)

    Hi. I'm trying to understand the calculation of a Levene's test of homogeneity of variance, for a section of my thesis on sex differences in...

    Started by reillyd‎, 12-16-2012 03:45 AM
    homogeneity tests, levene, standard deviation, variance
    • Replies: 0
    • Views: 2,866
    12-16-2012, 03:45 AM Go to last post
  57. testing moderation in repeated measures anova

    Hi, I'm testing whether the urge to disclose will differ for violent versus non-violent events, as a function of individual differences in...

    Started by nulook‎, 12-14-2012 09:07 PM
    • Replies: 0
    • Views: 2,409
    12-14-2012, 09:07 PM Go to last post
  58. Smile Is a two way ANOVA appropriate?

    Hello everyone, I am currently conducting some research into the effectiveness of future simulation on prospective memory in Alzheimer's patients....

    Started by Nahida‎, 12-14-2012 01:04 PM
    • Replies: 0
    • Views: 752
    12-14-2012, 01:04 PM Go to last post
  59. Mauchly's test of spericity

    Dear community, I'm doing a within factor ANOVA with color saturation (6levels), compatibility (compatible, incompatible), and RT quantile (5...

    Started by mathieu‎, 12-14-2012 10:53 AM
    • Replies: 0
    • Views: 937
    12-14-2012, 10:53 AM Go to last post
  60. longitudinal analysis with binary outcome?

    Dear all, I am wondering how to best analyze my data. I am looking at an whether an interaction between personality and friendship quality...

    Started by ursula1985‎, 12-14-2012 10:25 AM
    • Replies: 0
    • Views: 599
    12-14-2012, 10:25 AM Go to last post

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