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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: 21,138
    11-10-2005, 12:21 AM Go to last post
  1. Appropriate Statistical Test?

    Hi everyone, I have a question regarding the appropriate statistical test to use for a particular experiment. This is a 2x2 within-subject...

    Started by boogeyzero‎, 03-12-2015 03:15 AM
    • Replies: 0
    • Views: 574
    03-12-2015, 03:15 AM Go to last post
  2. How to do Mediation across pre-post timepoints?

    Hi all, I am looking into analyzing potential mediation and not sure how to approach it with two timepoints. For some context, participants are...

    Started by roquera‎, 03-10-2015 07:35 PM
    longitudinal, mediation, mediation analysis
    • Replies: 1
    • Views: 821
    03-11-2015, 08:17 AM Go to last post
  3. Analysis for a repeated measures design with covariate that varies over conditions?

    Hi all, I'm trying to find the correct analysis that will allow me to carry out the equivalent of a repeated measures MANCOVA with a covariate...

    Started by KVella‎, 03-05-2015 02:33 AM
    anova, covariate, manova, repeated measures, spss
    • Replies: 3
    • Views: 845
    03-10-2015, 05:03 PM Go to last post
  4. Unhappy Likert scale analysis: Help!

    Hi, I'm new here. I'm at my final bachelor year and in order to graduate, I need to write a thesis. The subject of my thesis regards the...

    Started by JustJoe‎, 03-05-2015 01:52 PM
    likert scale
    • Replies: 3
    • Views: 738
    03-06-2015, 03:10 PM Go to last post
  5. A Priori Power and Sensibility analysis

    Hi everyone, I'm new around here, so i don't know if this thread belong to this board, but if it doesn't just let me know. Here is the thing....

    Started by dhvalden‎, 03-02-2015 01:47 PM
    • Replies: 0
    • Views: 493
    03-02-2015, 01:47 PM Go to last post
  6. Mediation in SPSS

    Hi all, I need some help with the research that I'm curretly doing. I would like to analyse the mediation effect in this case: 1. SES -...

    Started by marta2992‎, 02-27-2015 10:09 AM
    mediation. spss.
    • Replies: 1
    • Views: 695
    02-27-2015, 01:13 PM Go to last post
  7. Beta weights - HELP PLEASE

    Are Beta weights the same as squared predictor-dependent variable correlation coefficients? Thanks! Ryan_Cohen

    Started by Ryan_Cohen‎, 02-24-2015 09:06 PM
    • Replies: 2
    • Views: 642
    02-25-2015, 06:48 PM Go to last post
  8. unipolar and bipolar scales

    Can I correlate unipolar and bipolar scales without doing anything special? A unipolar scale runs from zero to some number, e.g., 0-50 (usually...

    Started by mkspindler1‎, 02-24-2015 03:27 AM
    • Replies: 0
    • Views: 675
    02-24-2015, 03:27 AM Go to last post
  9. [help] Reporting Fisher r to z

    How to report Fisher r to z in APA format? I used the online calculator to calculate the z.......but I am not sure how to report it in my paper.

    Started by heidi‎, 02-20-2015 01:46 AM
    • Replies: 0
    • Views: 801
    02-20-2015, 01:46 AM Go to last post
  10. Not Sure How to Start

    I'm taking an online course, have read through the textbook, gone through the PowerPoint notes, tried looking this up elsewhere online, consulted...

    Started by colsam‎, 02-19-2015 02:49 PM
    • Replies: 2
    • Views: 632
    02-19-2015, 11:44 PM Go to last post
  11. Question pre- and post-test analysis: multiple comparison problem? can someone help me out?

    Dear all, I am doing research about a cognitive training program. I am curious to know how to analyse if the difference between the pre and the...

    Started by maart91‎, 02-16-2015 08:32 AM
    • Replies: 0
    • Views: 556
    02-16-2015, 08:32 AM Go to last post
  12. goal: why cumulative % exceeds 1 when I do principal axis factoring in STATA

    Hi, I surfed the net only to find reasons why it could exceed 1 if I use ipf or pf rotation for exploratory factory analysis. How about principal...

    Started by talkstats_user‎, 02-15-2015 08:57 AM
    • Replies: 0
    • Views: 486
    02-15-2015, 08:57 AM Go to last post
  13. Need help with an assignment for stats class: reading Two Factor ANOVA tables

    Hello, first I suck at statistics and have fallen behind a bit in my class and have a lot of very obvious questions to ask. This is probably one of...

    Started by Rodgelinkbot‎, 02-13-2015 11:29 PM
    • Replies: 2
    • Views: 600
    02-14-2015, 05:38 PM Go to last post
  14. Need help selecting the appropriate test!

    Hello all, I'm trying to determine if gender has an influence in 1. Qualifying for a competition (3 finalists) and 2. winning a competition (New...

    Started by Srab‎, 02-13-2015 11:35 AM
    • Replies: 0
    • Views: 422
    02-13-2015, 11:35 AM Go to last post
  15. comparing means of aggregate data

    Dear community, We recently administered a test with 30 multiple choice questions to a sample of freshmen at our college. I also received the...

    Started by EffectSize‎, 02-13-2015 10:25 AM
    • Replies: 0
    • Views: 495
    02-13-2015, 10:25 AM Go to last post
  16. Experimental design question

    I am struggling with the complexity of my experimental design... I apologize in advance for any incorrect terminology or grammar. I know that I...

    Started by belench19‎, 02-05-2015 10:15 PM
    blocking, experimental design, factorial design, nesting, split plot
    • Replies: 7
    • Views: 1,097
    02-12-2015, 03:08 PM Go to last post
  17. Grouped continuous variables in descriptives

    Hi, I am conducting a study in which I have measured stress (lowest score 1, highest 5 - Likert) and several other variables such as age,...

    Started by funnyman‎, 02-06-2015 01:04 PM
    • Replies: 3
    • Views: 721
    02-12-2015, 12:02 PM Go to last post
  18. choose a test for 4 independent variables research

    Hi, I conducdt a small research with 4 categorial independents variables and 1 ratio sependent variable. i intrested to find out about each...

    Started by natan1‎, 02-09-2015 11:34 AM
    • Replies: 8
    • Views: 883
    02-10-2015, 01:47 PM Go to last post
  19. linearity assumption HELP

    Hi, I am horrible with interpreting scatter plots and actually have a little argument with a friend over linearity of relationship between...

    Started by stell93‎, 02-09-2015 06:51 PM
    • Replies: 2
    • Views: 654
    02-10-2015, 05:44 AM Go to last post
  20. analysing cognitive rehabilitation and controlling for spontaneous recovery(SEM)

    Dear all, When trying to figure out the proportion of explained variance of a cognitive rehabilitation program for stroke patients, you have to...

    Started by maart91‎, 02-10-2015 04:46 AM
    control variable, sample groups, sem
    • Replies: 0
    • Views: 388
    02-10-2015, 04:46 AM Go to last post
  21. [R - "interval range"] - how to analyse a self-applied range?

    I am conducting a experiment in the form of a survey where I test the effect of three different framings on the same subject (data collecting has not...

    Started by hotjer‎, 02-09-2015 06:20 PM
    • Replies: 0
    • Views: 429
    02-09-2015, 06:20 PM Go to last post
  22. Violation of Homogeneity of Variance

    I'm using SPSS to test whether my two groups (HCs and Offspring) have a difference in the number of errors comitted on a psych measure. Total sample...

    Started by Shayshu‎, 02-05-2015 07:30 PM
    • Replies: 7
    • Views: 873
    02-09-2015, 06:00 PM Go to last post
  23. How to test my hypothesis?

    TLDR: I have acquired data via questionnaire, want to test hypothesis as in picture below. What to do? Dear all, I am studying psychology in...

    Started by AsbachAlex‎, 01-28-2015 05:06 AM
    • Replies: 5
    • Views: 1,169
    02-06-2015, 09:59 AM Go to last post
  24. A psy student in desperate need of help.

    Hey guys, lovely to know there's a forum that does SPSS. I have a task in Inferential Statistics that consists of 5 questions. I got two covered, but...

    Started by Ross‎, 02-04-2015 07:16 AM
    • Replies: 3
    • Views: 830
    02-05-2015, 02:19 PM Go to last post
  25. What test?

    Hello, I have 46 participants coming on three different days. They will be doing 3 tasks with three treatment/stimulation conditions. 1st...

    Started by rafiq‎, 02-05-2015 10:51 AM
    • Replies: 0
    • Views: 466
    02-05-2015, 10:51 AM Go to last post
  26. Psychology Research Data Analysis Help

    Just a little background on my data: I have been thinking about names and how I cannot imagine anyone I know to have a different name. Their name...

    Started by BrownIRL‎, 02-04-2015 03:34 PM
    • Replies: 2
    • Views: 637
    02-04-2015, 06:37 PM Go to last post
  27. Sociology - A Mapping of Cultural Practices

    Hi, For my thesis I study the french cultural social network SensCritique.com allowing people to rate and review different kind of cultural...

    Started by Mistral‎, 01-30-2015 07:16 AM
    • Replies: 2
    • Views: 685
    02-04-2015, 04:00 AM Go to last post
  28. 3 ways to decompose the strength of prediction in linear regression.

    I am wondering how to explain the three ways that the strength of prediction in linear regression can be decomposed. I need to explain using words...

    Started by Maybel‎, 03-26-2013 08:23 PM
    • Replies: 5
    • Views: 1,793
    02-03-2015, 01:13 AM Go to last post
  29. An unusual case

    Having some trouble figuring out the appropriate test for my data. The problem is structured as follows. For each of my subjects I have: 1) a...

    Started by grayden‎, 02-02-2015 10:50 PM
    • Replies: 0
    • Views: 438
    02-02-2015, 10:50 PM Go to last post
  30. Please help--what test do I use?

    Hello, I'm trying to answer the following using SPSS: is there a difference in Offspring Children and Healthy Controls on the number of errors...

    Started by Shayshu‎, 02-02-2015 12:38 AM
    • Replies: 1
    • Views: 500
    02-02-2015, 03:43 AM Go to last post
  31. need some help for finding the right method :)

    .-.-.-.-.-

    Started by uku1234‎, 02-01-2015 09:36 PM
    • Replies: 0
    • Views: 422
    02-01-2015, 09:36 PM Go to last post
  32. Unhappy Design to use?

    If I want to test music use for social reasons against music use for personal reasons and scores on an emotional wellbeing questionnaire, would this...

    Started by Tyldo‎, 01-29-2015 03:50 AM
    method, research design
    • Replies: 2
    • Views: 678
    01-29-2015, 06:40 PM Go to last post
  33. Using a dependent t-test with z-scores

    Hi, I'm trying to run a dependent t-test to check if the manipulation of the independent variable in an experiment worked. The independent...

    Started by ostwaertstramper‎, 01-26-2015 02:46 PM
    • Replies: 2
    • Views: 618
    01-27-2015, 05:23 AM Go to last post
  34. Change within groups and differences between groups

    Hi All, I have a question that perhaps is basic for most of you. I am hoping I can rely on your expertise to answer this question. I am trying...

    Started by casher‎, 01-24-2015 11:33 PM
    between-groups, change, groups, within-groups
    • Replies: 1
    • Views: 574
    01-24-2015, 11:34 PM Go to last post
  35. Complex study data analysis

    Good afternoon, I have a long-running experiment on music and emotion for my Ph.D. research. Big picture—there have been nine total ‘versions’...

    Started by brennon‎, 01-23-2015 03:47 PM
    data analysis, emotion, music
    • Replies: 2
    • Views: 729
    01-24-2015, 11:12 AM Go to last post
  36. Smile Factorial where you can't cross every factor?

    Does anyone know how to do a factorial analysis where you can't cross every factor? I did a melody recognition study where I measured accuracy of...

    Started by TomR‎, 01-21-2015 05:23 PM
    • Replies: 1
    • Views: 611
    01-22-2015, 07:57 AM Go to last post
  37. Weaknesses in the assumptions misuses of HLM/multilevel modeling

    Hopefully the title says it. What do people see as potential/perceived weaknesses in the assumptions and/or misuses of HLM/multilevel modeling?

    Started by trinker‎, 01-17-2015 01:35 PM
    hlm, multilevel
    • Replies: 4
    • Views: 855
    01-19-2015, 02:59 PM Go to last post
  38. MANCOVA w/ continuous IV?

    For my thesis, I originally proposed to do a MANCOVA with various continuous covariates, four continuous DVs, and two categorical IVs, one of which I...

    Started by ImSkyKid‎, 01-14-2015 12:05 PM
    • Replies: 1
    • Views: 608
    01-19-2015, 03:29 AM Go to last post
  39. non parametric one sample binomial test

    Hello nice people, I am facing a problem with the binomial test in SPSS; i do not know how to interpret it :( I have to submit my thesis on...

    Started by missmiou‎, 01-17-2015 12:02 PM
    • Replies: 1
    • Views: 722
    01-19-2015, 03:25 AM Go to last post
  40. Age as covariate removes interaction with group

    Hello, I'm new here. Thanks for reading. I'm running a between subjects repeated measures anova in spss. I have one factor (with two levels;...

    Started by stats_noob7‎, 01-12-2015 08:03 AM
    • Replies: 0
    • Views: 1,081
    01-12-2015, 08:03 AM Go to last post
  41. bonferroni corrected p-values pairwise comparisons SPSS

    Dear, I am using Linear Mixed Modeling in SPSS. I have a significant interaction between two variables: correctness (2 levels: correct vs error)...

    Started by desS‎, 01-07-2015 09:00 AM
    bonferroni correction, pairwise comparisons, spss
    • Replies: 1
    • Views: 1,351
    01-07-2015, 09:25 AM Go to last post
  42. latent class analysis

    Hi all: I'm interested in using a set of 6 binary indicators to do a latent class analysis and I'm wondering if my strategy can be improved. We...

    Started by jamesmartinn‎, 11-26-2014 08:38 AM
    • Replies: 2
    • Views: 891
    01-04-2015, 12:27 AM Go to last post
  43. need help for chose statistic methods

    hello every body. Im doing a research to comparing to type of exercise in body composition. per exercise protocol has 4 steps testing (pre-test,...

    Started by ali127‎, 12-29-2014 10:47 AM
    anova
    • Replies: 0
    • Views: 546
    12-29-2014, 10:47 AM Go to last post
  44. Need to use Bonferroni?

    Hi there, I am unsure whether I need to use a Bonferroni correction... I have conducted 20 paired t-tests to analyse change in scores from...

    Started by flapjacj2000‎, 12-20-2014 06:33 PM
    • Replies: 5
    • Views: 1,035
    12-23-2014, 11:00 AM Go to last post
  45. How to do stratified randomised allocation.

    Hello, Can anyone clearly explain some good, proper methods to do stratified randomised allocation? I have looked in my stats/research books...

    Started by Jake-Finn‎, 11-05-2014 04:48 AM
    • Replies: 5
    • Views: 1,205
    12-18-2014, 04:12 PM Go to last post
  46. Which method is best for synthesising effectiveness data of interventions?

    Hello everyone, I was wondering if someone might be able to point me in the right direction... I want to combine the findings of several...

    Started by Ant_Thompson‎, 12-13-2014 04:59 PM
    meta-analysis, systematic review
    • Replies: 0
    • Views: 596
    12-13-2014, 04:59 PM Go to last post
  47. One-way ANOVA - which is best effect size stats to report for unequal size samples?

    I am finding quite contradictory information on line as to which best statistics to use for effect size for one-way ANOVA when the size of the groups...

    Started by Arvoriad‎, 12-12-2014 09:30 PM
    • Replies: 0
    • Views: 634
    12-12-2014, 09:30 PM Go to last post
  48. Needed effect size of a treatment from variation of base stimuli?

    Hello, from a previous experiment I know the variance of ratings from subjects to a given stimulus in its original form. Now if I make an...

    Started by masch‎, 12-11-2014 05:12 AM
    • Replies: 0
    • Views: 591
    12-11-2014, 05:12 AM Go to last post
  49. small SD

    Hi, for my stats course, we are using a programme my tutor made himself and we found that having a small SD compared to large doesn't actually affect...

    Started by Rupert93‎, 12-08-2014 10:26 AM
    • Replies: 2
    • Views: 810
    12-08-2014, 02:44 PM Go to last post
  50. correlation/regression with data that's non-normally distributed, collinear, missing

    I have a dataset that's like this: dependent variable: standardized test score independent variables: weeks spent using study method A weeks...

    Started by chronicidal‎, 12-06-2014 12:55 AM
    • Replies: 0
    • Views: 738
    12-06-2014, 12:55 AM Go to last post
  51. how to determine qualitative dispersion over time with differing sample sizes

    I've been working on a study with workers at a certain plant, to test their safety awareness. During a meeting, everyone is asked to select a card...

    Started by Junes‎, 12-03-2014 12:20 PM
    correlation, qualitative variation, time trend
    • Replies: 0
    • Views: 555
    12-03-2014, 12:20 PM Go to last post
  52. Single Subject Research Analyses

    Hello, Thank you in advance for taking the time to read and consider this problem. I really appreciate it. I am doing some single subject...

    Started by clareish‎, 11-27-2014 12:23 PM
    • Replies: 2
    • Views: 915
    11-27-2014, 06:49 PM Go to last post
  53. Can someone give me feedback about this post-hoc study of learner retention?

    Hello all, I studied experimental psychology at university and had two under grad courses in stats plus research methods, advanced quantitative...

    Started by kyiv‎, 11-19-2014 04:19 PM
    • Replies: 5
    • Views: 1,016
    11-24-2014, 10:30 PM Go to last post
  54. Comparing the validity of two scales to a golden standard

    Hi there! I've been advising a friend on his research project, but I have to admit I'm a bit out of my league and would appreciate any help. He is...

    Started by Junes‎, 11-23-2014 02:12 PM
    • Replies: 4
    • Views: 972
    11-24-2014, 04:27 AM Go to last post
  55. Statistics test for frequency counts (please read!)

    Hello, Please forgive my ignorance, it’s been a while since I have done any quantitative research. I used to be okay at it, but I always...

    Started by clareish‎, 11-21-2014 04:48 PM
    • Replies: 3
    • Views: 816
    11-21-2014, 06:25 PM Go to last post
  56. Please help! Running ANOVA with skewed data in some conditions

    Hi there, I really hope you can help. I've been looking on a number of forums and have had no luck. Also have been looking through some of the...

    Started by ninja‎, 11-06-2014 03:25 PM
    anova, log10, residuals non-normal, transformations
    • Replies: 13
    • Views: 1,866
    11-16-2014, 04:31 PM Go to last post
  57. Outliers with skewed distributions

    Hi! I hope you can help! I'm using the outlier labelling rule (with a g multiplier of 2.2) to remove outliers in any normally distributed dependent...

    Started by ninja‎, 11-13-2014 07:20 PM
    • Replies: 1
    • Views: 733
    11-13-2014, 11:13 PM Go to last post
  58. cohens d and nominal data pwweaase help

    Hey, I was wondering why I have been told to do a wilcoxin for my child psychology study on overimitation...the DV is nominal(they overimitate or...

    Started by Rupert93‎, 11-11-2014 12:06 PM
    • Replies: 3
    • Views: 888
    11-13-2014, 10:44 AM Go to last post
  59. Summation Scores - assumptions

    Hi, maybe not practical in essence, but: what are the assumptions underlying summated scores (simple summation of Yes/No dichotomous items or...

    Started by Martin Marko‎, 11-12-2014 08:07 AM
    • Replies: 1
    • Views: 844
    11-12-2014, 01:58 PM Go to last post
  60. Cohen's Kappa - I have a variable number of codes per unit of text

    Hi all, I have a question about Cohen's Kappa that have been puzzled about for a long time - it comes up all the time for me, almost every single...

    Started by vonkorff‎, 11-11-2014 03:16 PM
    • Replies: 0
    • Views: 653
    11-11-2014, 03:16 PM Go to last post

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