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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: 32,110
    11-10-2005, 12:21 AM Go to last post
  1. Understanding correlations in order to test speed-accuracy trade-off in experiments

    I understand that in experiments where the measures of interest are speed (reaction time) and accuracy, for an effect to be valid one needs to make...

    Started by Poppy1‎, 10-18-2016 04:33 PM
    accuracy, correlation, reaction time, sat, speed-accuracy trade-off
    • Replies: 3
    • Views: 3,095
    10-20-2016, 05:15 PM Go to last post
  2. Regression for multiple scores obtained from multiple subjects

    Hello, I have preference ratings (1-to-7 scale) for k=80 stimuli, obtained from N=30 subjects. I would like to do a multiple regression for these...

    Started by wildetudor‎, 10-19-2016 07:08 PM
    matlab, multiple regression, regression, repeat measures
    • Replies: 0
    • Views: 2,327
    10-19-2016, 07:08 PM Go to last post
  3. Can someone give example of, 2-way randomized fixed factor Anova (between subjects)

    Hi all, can someone give a link, or even a description of a two-way randomized fixed factor design, in which all factors (2) are between subject...

    Started by allie_moore‎, 10-19-2016 01:27 PM
    • Replies: 0
    • Views: 1,751
    10-19-2016, 01:27 PM Go to last post
  4. ANOVA help

    Hi everyone, I desperately need help with this ANOVA stuff. I didn't get to do my 2nd year STATs subjects, and I have no idea how to interpret...

    Started by Dragonaire‎, 10-18-2016 06:55 PM
    • Replies: 0
    • Views: 2,589
    10-18-2016, 06:55 PM Go to last post
  5. ANOVA on simple proportional accuracy scores versus on d prime indexes

    To answer this, you would need to know what d prime is. Here is a link: http://www-psych.stanford.edu/~lera/psych115s/notes/signal/ The method I...

    Started by Poppy1‎, 10-18-2016 05:02 PM
    accuracy, anova, d prime, power, signal detection theory
    • Replies: 0
    • Views: 2,090
    10-18-2016, 05:02 PM Go to last post
  6. Lightbulb What statistical tests to use? - advice please

    Hi all I am working on a project looking at ADHD in a large sample of adolescents. I am looking to investigate whether there are any differences...

    Started by sallysolomon‎, 10-14-2016 11:21 AM
    independent sample, spss, t-test
    • Replies: 2
    • Views: 2,516
    10-17-2016, 11:38 AM Go to last post
  7. Within Subjects Repeated Measures - Overall correlation across subjects

    Iíll just start by giving a brief description of my study. Itís a memory study in which participants study an object and a cue stimulus together for...

    Started by TommyJimmy‎, 03-23-2011 08:59 AM
    • Replies: 4
    • Views: 9,590
    10-14-2016, 05:54 AM Go to last post
  8. Physiological statistics

    Hello, I am planning my study, and cannot find the answers in a textbook, please could I have some advice? I am looking at variations in muscle...

    Started by DanielWals‎, 10-13-2016 10:16 AM
    • Replies: 0
    • Views: 2,251
    10-13-2016, 10:16 AM Go to last post
  9. Incredibility Index

    Any anyone worked with the incredibility index before (Schimmack, 2012)? I've been trying to figure out exactly how it is calculated. Unfortunately,...

    Started by chigou‎, 10-11-2016 01:19 AM
    • Replies: 9
    • Views: 4,135
    10-12-2016, 10:37 AM Go to last post
  10. no interaction but moderated mediation?

    Hello, my ANOVA analysis shows me that I have no interaction between my moderator and IV. Is it still possible to test for a moderated...

    Started by yologer‎, 10-09-2016 05:22 AM
    • Replies: 3
    • Views: 2,598
    10-09-2016, 04:04 PM Go to last post
  11. Between and within group differences

    I am doing a research project on antisocial youth behavior and SES inequality. I am supposed to run two level logistic regression in STATA. There is...

    Started by Nour13‎, 09-15-2016 06:41 AM
    logistic regression, multi level, stata
    • Replies: 2
    • Views: 2,724
    10-05-2016, 03:55 PM Go to last post
  12. Creating a summative scale for items with different number of response categories?

    Dear TalkStats users, Let me first give you my main goal: I would like to create a summative scale that I could compare with other scales (each of...

    Started by menteith‎, 10-03-2016 09:31 AM
    likert scale, likert-type scale
    • Replies: 0
    • Views: 1,648
    10-03-2016, 09:31 AM Go to last post
  13. What does only one significant standardised residual mean in 2x3 Chi Squared tables?

    Hi everyone. I'm writing up a report for my advisor, which compares count data for three conditions, across two different groups. I therefore have a...

    Started by DrJay‎, 09-29-2016 06:45 AM
    categorical data, chi squared, count data, residuals, standardized residuals
    • Replies: 2
    • Views: 2,638
    09-29-2016, 03:12 PM Go to last post
  14. What to do about higher drop out rates in one group compared to another group?

    Hey all - Something I am noticing with my data (still collecting) is that drop out rates in Group 1 is much higher than in Group 2. What is the...

    Started by allie_moore‎, 09-27-2016 12:46 PM
    • Replies: 3
    • Views: 2,514
    09-27-2016, 08:54 PM Go to last post
  15. Post When to control for multiple comparisons?

    I have a test that I have given people, and it is looking at two particular variables. Each variable has two item types. So either an item is, for...

    Started by sunlight123‎, 09-24-2016 11:36 AM
    anovas, familywise error, multiple comparisons
    • Replies: 10
    • Views: 3,157
    09-27-2016, 10:22 AM Go to last post
  16. PROCESS: Interaction term not significant but conditional indirect effect

    Hello, my moderated mediation model with a mediation effect (two mediators), but PROCESS is telling my that my moderating effect (one moderator)...

    Started by yologer‎, 09-13-2016 06:40 AM
    • Replies: 1
    • Views: 2,163
    09-26-2016, 07:44 PM Go to last post
  17. PROCESS: dichotomous moderator

    Hello, I'm testing my moderated mediation model. I have dichotomous predictor and modeator. PROCESS is telling me that: "When the moderator is...

    Started by yologer‎, 09-25-2016 11:45 AM
    • Replies: 1
    • Views: 2,760
    09-26-2016, 07:35 PM Go to last post
  18. Sample Size Requirements (Power of .80.....)

    Hi everyone, first post here :) Hoping to get some help with finding appropriate sample size for a little study. Ill try to give all relevant...

    Started by allie_moore‎, 09-23-2016 12:51 PM
    • Replies: 4
    • Views: 3,903
    09-26-2016, 10:41 AM Go to last post
  19. How do I examine statistical differences between sensitivity and specificity values?

    Hi again, I have created sensitivity and specificity values for 2 devices against a gold standard. I would like to see whether these 2 devices...

    Started by coffee123‎, 09-24-2016 12:25 AM
    • Replies: 5
    • Views: 2,853
    09-25-2016, 01:16 AM Go to last post
  20. Combining measures into 1 variable

    I have 2 variables, one that measures (just for an examples) state aggression, and 1 that measures trait aggression. The state measure was responded...

    Started by lsrms3‎, 09-04-2016 01:11 PM
    combine measure, measure, question, statistics, variable
    • Replies: 7
    • Views: 2,550
    09-21-2016, 06:08 PM Go to last post
  21. Different results between MANOVA and Regression (PROCESS - moderated Mediation)

    I have to calculate a moderated mediation with 2 mediators and 2 dependent variables. My model: predictor (dichotomous) moderator...

    Started by yologer‎, 09-19-2016 11:03 AM
    • Replies: 1
    • Views: 2,135
    09-20-2016, 10:51 AM Go to last post
  22. Testing an exploratory factor analysis model?

    Dear colleagues, Is an exploratory factor analysis (EFA) model testable? is it common to test an EFA model using fit indices? the plausibility of a...

    Started by Anthony_1000‎, 09-13-2016 01:16 PM
    • Replies: 1
    • Views: 1,343
    09-13-2016, 08:40 PM Go to last post
  23. Falsify Normality results

    Is it possible to falsify normality results - in order to conduct parametric analysis of results? Or will someone be able to tell?

    Started by ivyc‎, 09-12-2016 10:45 AM
    falsify, normality, statistics
    • Replies: 3
    • Views: 2,124
    09-13-2016, 02:17 AM Go to last post
  24. Power calculation

    Conducted a preliminary study & want to determine if i need more participants. How do I do this using spss 30 n , 10 stimuli (2 subcategories, 5...

    Started by ivyc‎, 09-07-2016 01:50 PM
    power, psychology, spss
    • Replies: 2
    • Views: 1,578
    09-09-2016, 10:36 AM Go to last post
  25. Assumption of Equal Sample Size for Publication Bias Analysis

    I am trying to do a meta analysis across 30ish studies and I am reachign the point of working on the publication bias issue. Unfortunately, for...

    Started by chigou‎, 09-05-2016 11:33 PM
    • Replies: 0
    • Views: 1,227
    09-05-2016, 11:33 PM Go to last post
  26. CFA - compare two different models with same outcome

    Hello, I'm testing my model in a CFA which hasaccording to my EFA two factors. I had two theories: 1.) Two Factors (correlation between...

    Started by yologer‎, 08-31-2016 05:42 PM
    • Replies: 2
    • Views: 1,676
    08-31-2016, 06:25 PM Go to last post
  27. DIF Analyses with Missing Data

    Hi all, I'm currently analyzing items from a bank for K-12 education. I have a separate data set for each grade/subject combination (for example,...

    Started by bshelly‎, 08-23-2016 09:34 AM
    dif, missing data
    • Replies: 1
    • Views: 2,522
    08-31-2016, 06:01 PM Go to last post
  28. Can we test when a correlation becomes significant?

    Hi all, Apologies that this is going to be quite a basic question, I just can't seem to find an answer in books and google etc.. If say I have...

    Started by Calger‎, 08-19-2016 10:00 AM
    • Replies: 4
    • Views: 3,492
    08-31-2016, 04:13 PM Go to last post
  29. Compute reliability after modification my model in AMOS

    Hello, I've modified my model in AMOS to get a better fit. I've transferred my new factors with regression imputation to SPSS. I like to...

    Started by yologer‎, 08-30-2016 05:28 PM
    • Replies: 0
    • Views: 2,293
    08-30-2016, 05:28 PM Go to last post
  30. No bivariate correlation for mediation/moderated mediation

    Hello :) I've checked my bivariate correlation and found this pattern (graphic) Question 1: I want to test, if both mediators predict both...

    Started by yologer‎, 08-27-2016 02:09 PM
    • Replies: 0
    • Views: 1,713
    08-27-2016, 02:09 PM Go to last post
  31. Question comparing two sets of data

    hi, i want to check whether the two samples can be drawn from the same distribution. can i do it with chi-square test? what are the assumptions i...

    Started by hagit‎, 08-21-2016 07:41 AM
    chi square test, data set
    • Replies: 0
    • Views: 2,130
    08-21-2016, 07:41 AM Go to last post
  32. Interpreting negative correlations between factors?

    Hello evetyone! I conducted factor analysis on a 30-item scale which is suppose to be measuring xenophobia. All the variables were previously...

    Started by capybara‎, 08-17-2016 08:04 AM
    factor analysis, interpretation, negative correlation
    • Replies: 1
    • Views: 1,030
    08-17-2016, 09:25 AM Go to last post
  33. What statistical method to use?

    I am currently designing a study and have all of the data entered but am having trouble finding the statistical method that should be used. ...

    Started by atamalu‎, 08-16-2016 01:18 PM
    • Replies: 1
    • Views: 1,672
    08-16-2016, 01:40 PM Go to last post
  34. Moderated Mediation Model using PROCESS

    Hello, I am running a moderated mediation model using PROCESS macro in SPSS and a bit confused with the results. The interaction of IV and...

    Started by Jchavano‎, 08-16-2016 10:20 AM
    moderated mediation, process
    • Replies: 0
    • Views: 978
    08-16-2016, 10:20 AM Go to last post
  35. [Combining data][2-way between-groups ANOVA]

    Dear smart people, I am currently finishing my Master's in International Business Communication and I am wondering if I can combine data to...

    Started by alanacrs‎, 08-12-2016 08:50 AM
    anova, combining data
    • Replies: 0
    • Views: 1,103
    08-12-2016, 08:50 AM Go to last post
  36. What analysis method available? Exploratory analysis with repeated measures design.

    Hi, I would like to know if there is any analysis method that explores patterns between independent variables that are repeatedly measured. To...

    Started by Skyskipper‎, 08-12-2016 07:04 AM
    • Replies: 0
    • Views: 1,010
    08-12-2016, 07:04 AM Go to last post
  37. Inter-rater reliability - what analysis do I use?

    During an intensive 5-day group therapy camp, where counselors are 1:1 paired with a camper (25 campers, 25 counselors), we collected data on the...

    Started by PsychResearch‎, 08-10-2016 07:29 PM
    • Replies: 0
    • Views: 1,494
    08-10-2016, 07:29 PM Go to last post
  38. Unhappy Mixed ANOVA - How to interpret and write up results

    Hello everyone! I'm struggling with my first-ever data analysis using SPSS. I have conducted a mixed ANOVA using a total number of objects kept...

    Started by Viellina‎, 08-10-2016 10:38 AM
    • Replies: 0
    • Views: 1,735
    08-10-2016, 10:38 AM Go to last post
  39. Different Outcomes between MANOVA and PROCESS

    Hello, I'm checking a moderated mediation. First of all I put my both IV and both mediators in a MANOVA. Next I put all variables in PROCESS....

    Started by yologer‎, 08-10-2016 08:27 AM
    • Replies: 0
    • Views: 1,563
    08-10-2016, 08:27 AM Go to last post
  40. Question Anova: Components of variation in population (notation in Doncaster and Davey)

    Hi I am reading Doncaster and Davey's 2007 book. The book lists the appropriate ANOVA/ANCOVA models for combinations of nested and crossed...

    Started by Shraspen‎, 08-08-2016 02:45 PM
    • Replies: 0
    • Views: 641
    08-08-2016, 02:45 PM Go to last post
  41. Pair t-test with non-independent samples

    Dear list, In my experiment, each subject of my sample has three time-series of data: tc_A, tc_B and tc_C. Using Pearson correlation within...

    Started by john.gelburg‎, 08-07-2016 01:41 PM
    t-test
    • Replies: 0
    • Views: 1,360
    08-07-2016, 01:41 PM Go to last post
  42. Multilevels model versus Regression

    Assume I want to model data on dependent variable y_i for N observations belonging to J groups. Assume we are looking at N students distributed on J...

    Started by JesperHP‎, 08-03-2016 03:29 PM
    james & stein, shrinkage
    • Replies: 6
    • Views: 2,007
    08-05-2016, 01:11 PM Go to last post
  43. Sample size for mediation analysis

    Does anyone know of any clear guidance on how to calculate sample size for mediation analyses? My research is looking at whether the relationship...

    Started by missychar‎, 08-05-2016 04:59 AM
    • Replies: 2
    • Views: 1,611
    08-05-2016, 10:13 AM Go to last post
  44. Association between interval and possibly binary variables

    Hello, I am in the process of writing my dissertation proposal, which will be examining treatment outcomes in first episode psychosis clients....

    Started by emma621‎, 08-04-2016 08:47 PM
    • Replies: 1
    • Views: 721
    08-04-2016, 11:38 PM Go to last post
  45. 3-way ANOVA with unequal sample sizes (between-groups)

    Dear smart people, I am currently finishing my Master's in International Business Communication and have run into a problem with my data. I was...

    Started by alanacrs‎, 08-04-2016 05:53 AM
    anova, between-group, three-way anova, unequal sample sizes
    • Replies: 0
    • Views: 1,890
    08-04-2016, 05:53 AM Go to last post
  46. Comparing groups when each subject can be in multiple groups - which test?

    Hi all, I would like to compare groups on a ratio DV when each subject can belong to more than one group. I am used to data where each subject...

    Started by RobCooper‎, 08-03-2016 04:37 AM
    • Replies: 0
    • Views: 915
    08-03-2016, 04:37 AM Go to last post
  47. Mixed ANOVA post hocs-paired samples t tests or bonferroni corrected?

    Hey everyone, Just a question on what is the best statistical test to report with this study I am doing. So, in the study, I am separating...

    Started by aiyer1‎, 08-01-2016 11:05 AM
    • Replies: 0
    • Views: 2,467
    08-01-2016, 11:05 AM Go to last post
  48. Control Variables & moderated Mediation

    Hello, I'm testing a moderated mediation with two dependent variables, so I'm running two tests with PROCESS SPSS. I have included 5 control...

    Started by yologer‎, 07-31-2016 11:22 AM
    control variables
    • Replies: 4
    • Views: 2,312
    08-01-2016, 08:05 AM Go to last post
  49. Repeated measures ANOVA on correlation coefficients

    The purpose of the study is to examine a gradual linear decay in an EEG signal over a period of time. I measured the average signal over 20 bins of...

    Started by shlomit‎, 08-01-2016 01:36 AM
    correlated correlations, r to z fisher transform., repeated measures anova
    • Replies: 0
    • Views: 1,078
    08-01-2016, 01:36 AM Go to last post
  50. Reporting GEE results

    I'm working on a paper, and was struggling with how to analyze one question, and finally figured out that I needed to use GEE, ran the model, and...

    Started by cmc253‎, 07-29-2016 05:47 PM
    gee
    • Replies: 1
    • Views: 3,335
    07-29-2016, 09:20 PM Go to last post
  51. Question comparing distributions

    hi as a part of my thesis, i have two discrete distributions. i want to check if it is possible that they both drawn from the same distribution. i...

    Started by hagit‎, 07-28-2016 07:14 AM
    • Replies: 3
    • Views: 2,155
    07-28-2016, 06:30 PM Go to last post
  52. Wilcoxon Signed rank test, Students's T-test, or a mixture of both?

    Hello! For my dissertation I am looking at the temporal order of physiological and behavioural events before a voluntary action. I have 12 different...

    Started by pepperpockets‎, 07-27-2016 04:24 AM
    psychology, t-test, wilcoxon signed-rank test
    • Replies: 4
    • Views: 2,863
    07-27-2016, 08:32 AM Go to last post
  53. Meaningful Variables

    Some background: I am an early childhood educator taking my very first statistics course. We are in week three and I am already lost. We are...

    Started by amhcmh‎, 04-26-2014 11:12 AM
    • Replies: 6
    • Views: 13,820
    07-26-2016, 07:16 PM Go to last post
  54. Exclamation Discrepancy between Chi-square and sensitivity and specificity

    The performance of 19 impaired and 42 typically developing children was tested using 3 assessment parameters to see which parameter best...

    Started by Naomiyiftach‎, 07-24-2016 08:14 PM
    chi-square, chi-square help, diagnostic accuracy
    • Replies: 3
    • Views: 3,282
    07-25-2016, 08:32 AM Go to last post
  55. How to convert two different types of measurement (both in ms) to run a MANOVA?

    I measured reaction time and movement time in an experiment (within-subjects measures) and want to run a MANOVA in SPSS with these measures as the...

    Started by Poppy1‎, 07-19-2016 09:25 PM
    repeated measures manova, spss, z-scores
    • Replies: 2
    • Views: 1,441
    07-20-2016, 08:46 PM Go to last post
  56. Question Study design flaw - no participant IDs.

    Hi :wave:, I have been asked to do the statistical analysis aspect on a mixed methods study that was supposed to follow a pre/post analysis...

    Started by dublinguy‎, 07-18-2016 02:42 PM
    flaws, participants number, pre post, spss, study design
    • Replies: 5
    • Views: 1,493
    07-18-2016, 06:35 PM Go to last post
  57. Data screening for regression analysis

    I am currently attempting an assessment for my Psychology MSc but am a little confused by the screening required. I have three independent...

    Started by Missjeevious‎, 07-15-2016 03:24 PM
    • Replies: 4
    • Views: 1,551
    07-16-2016, 09:40 PM Go to last post
  58. Analyzing Sleep and Productivity Data

    You are given data that stores the hours that an individual slept every night between the data's start and end points. You are also given the...

    Started by c_harris‎, 07-12-2016 06:03 PM
    data analysis
    • Replies: 3
    • Views: 1,542
    07-13-2016, 11:17 AM Go to last post
  59. Interpreting findings in Behavioural Science Journal

    Hi everyone, I've been trying my best to think about how to put this problem across. The authors of the paper said they used a multinomial logits...

    Started by WebberNaturals‎, 07-11-2016 11:35 AM
    • Replies: 0
    • Views: 1,033
    07-11-2016, 11:35 AM Go to last post
  60. Red face The Best Statistical Analysis Method and How to calculate number of participants

    Hello all! I have a research design : As it can be seen A, B, C are independent variables; D is a mediator and E is the dependent...

    Started by Ayfer‎, 07-09-2016 12:59 PM
    • Replies: 4
    • Views: 1,595
    07-10-2016, 02:19 AM Go to last post

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