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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: 25,985
    11-10-2005, 12:21 AM Go to last post
  1. Factor analysis

    Dear all, I have a question concerning a factor analysis run in Stata (principal factor, no rotation), based on 12 variables - my experience with...

    Started by dnh‎, 11-01-2016 06:10 AM
    • Replies: 0
    • Views: 1,332
    11-01-2016, 06:10 AM Go to last post
  2. Repeated ANOVA using comparable starting values?

    Hello, I have a weird problem that I've never encountered before. I'm hoping someone else might provide their insight. I am conducted a study...

    Started by PillBaxton‎, 10-25-2016 10:55 AM
    repe
    • Replies: 1
    • Views: 1,479
    10-27-2016, 02:48 AM Go to last post
  3. Need help: Running a One-way FIXED effects Between Subject, ANOVA in SPSS.

    I am having to run a One-way FIXED effects Between Subject, ANOVA in SPSS, and I am STUCK! :( Anyone care to help? I will explain the best I can...

    Started by allie_moore‎, 10-25-2016 07:36 PM
    • Replies: 1
    • Views: 1,639
    10-26-2016, 06:55 AM Go to last post
  4. Composite reliability vs Cronbach's alpha

    Hello Wondering if someone could clarify I'm developing a new measure with 10 constructs. Each construct has between 4 - 6 items. I've...

    Started by anon2000‎, 09-09-2014 03:02 AM
    2 Pages
    1 2
    composite reliability, cronbach's alpha, questionnaire development, reliability
    • Replies: 21
    • Views: 27,389
    10-24-2016, 04:47 PM Go to last post
  5. Structural Equiation Modeling - Likert variable and fit indices

    Hello everybody! Thank you in advance for reading, and for trying to help! To put it briefly.. I am working with Structural Equiation Modeling...

    Started by SFArtamendi‎, 10-24-2016 10:13 AM
    likert, rmsea, sem
    • Replies: 1
    • Views: 1,444
    10-24-2016, 02:07 PM Go to last post
  6. HELP with data collection methods and data analysis in quantitative research

    I am doing a research proposal on the effect of a drug on haemorrhage growth in traumatic brain injury. what level of data measurement will i use to...

    Started by murrayk‎, 10-21-2016 08:59 PM
    • Replies: 1
    • Views: 1,289
    10-22-2016, 12:49 AM Go to last post
  7. Unhappy Quick one please: Difference between 1-way and 2-way ANOVA - Example provided

    Hello, I apologize in advance if this is too simple for these forums, but I am just wanted to be very sure. Example: A study that looks at 2...

    Started by Sagan_24‎, 09-27-2016 11:59 PM
    factorial anova, one-way anova
    • Replies: 7
    • Views: 1,758
    10-21-2016, 07:06 AM Go to last post
  8. 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: 1,594
    10-20-2016, 05:15 PM Go to last post
  9. 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: 1,178
    10-19-2016, 07:08 PM Go to last post
  10. 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: 963
    10-19-2016, 01:27 PM Go to last post
  11. 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: 1,284
    10-18-2016, 06:55 PM Go to last post
  12. 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: 1,004
    10-18-2016, 05:02 PM Go to last post
  13. 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: 1,471
    10-17-2016, 11:38 AM Go to last post
  14. 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: 7,017
    10-14-2016, 05:54 AM Go to last post
  15. 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: 1,182
    10-13-2016, 10:16 AM Go to last post
  16. 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: 1,843
    10-12-2016, 10:37 AM Go to last post
  17. 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: 1,229
    10-09-2016, 04:04 PM Go to last post
  18. 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: 1,467
    10-05-2016, 03:55 PM Go to last post
  19. 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: 796
    10-03-2016, 09:31 AM Go to last post
  20. 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: 1,133
    09-29-2016, 03:12 PM Go to last post
  21. 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: 1,301
    09-27-2016, 08:54 PM Go to last post
  22. 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: 1,633
    09-27-2016, 10:22 AM Go to last post
  23. 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: 869
    09-26-2016, 07:44 PM Go to last post
  24. 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: 824
    09-26-2016, 07:35 PM Go to last post
  25. 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: 1,083
    09-26-2016, 10:41 AM Go to last post
  26. 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: 1,075
    09-25-2016, 01:16 AM Go to last post
  27. 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: 1,500
    09-21-2016, 06:08 PM Go to last post
  28. 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: 935
    09-20-2016, 10:51 AM Go to last post
  29. 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: 601
    09-13-2016, 08:40 PM Go to last post
  30. 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: 1,069
    09-13-2016, 02:17 AM Go to last post
  31. 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: 643
    09-09-2016, 10:36 AM Go to last post
  32. 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: 645
    09-05-2016, 11:33 PM Go to last post
  33. 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: 888
    08-31-2016, 06:25 PM Go to last post
  34. 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: 1,120
    08-31-2016, 06:01 PM Go to last post
  35. 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: 1,578
    08-31-2016, 04:13 PM Go to last post
  36. 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: 984
    08-30-2016, 05:28 PM Go to last post
  37. 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: 876
    08-27-2016, 02:09 PM Go to last post
  38. 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: 1,037
    08-21-2016, 07:41 AM Go to last post
  39. 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: 391
    08-17-2016, 09:25 AM Go to last post
  40. 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: 700
    08-16-2016, 01:40 PM Go to last post
  41. 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: 460
    08-16-2016, 10:20 AM Go to last post
  42. [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: 410
    08-12-2016, 08:50 AM Go to last post
  43. 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: 375
    08-12-2016, 07:04 AM Go to last post
  44. 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: 715
    08-10-2016, 07:29 PM Go to last post
  45. 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: 633
    08-10-2016, 10:38 AM Go to last post
  46. 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: 587
    08-10-2016, 08:27 AM Go to last post
  47. 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: 381
    08-08-2016, 02:45 PM Go to last post
  48. 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: 556
    08-07-2016, 01:41 PM Go to last post
  49. 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: 922
    08-05-2016, 01:11 PM Go to last post
  50. 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: 672
    08-05-2016, 10:13 AM Go to last post
  51. 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: 347
    08-04-2016, 11:38 PM Go to last post
  52. 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: 706
    08-04-2016, 05:53 AM Go to last post
  53. 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: 372
    08-03-2016, 04:37 AM Go to last post
  54. 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: 1,306
    08-01-2016, 11:05 AM Go to last post
  55. 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: 928
    08-01-2016, 08:05 AM Go to last post
  56. 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: 357
    08-01-2016, 01:36 AM Go to last post
  57. 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: 1,583
    07-29-2016, 09:20 PM Go to last post
  58. 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: 931
    07-28-2016, 06:30 PM Go to last post
  59. 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: 1,318
    07-27-2016, 08:32 AM Go to last post
  60. 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: 9,025
    07-26-2016, 07:16 PM Go to last post

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