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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, 11-09-2005 11:21 PM
    • Replies: 0
    • Views: 12,342
    11-09-2005, 11:21 PM Go to last post
  1. Test-Retest Reliability Coefficient

    Hi Folks, Hopefully this is a relatively easy question. I collected data on a measure at two time points, and I would like to run a test-retest...

    Started by herwitz‎, 07-22-2014 08:35 AM
    cohen's kappa, test-retest
    • Replies: 7
    • Views: 344
    Today, 03:32 AM Go to last post
  2. Sample Size for Prevalence Study

    Hi All, I was hoping to get some advice on how to use the following formula to estimate sample size for a prevalence study (paper with exact...

    Started by bozatron‎, 10-27-2014 03:12 AM
    sample size
    • Replies: 1
    • Views: 123
    10-27-2014, 08:14 AM Go to last post
  3. Do clothes or underwear express character?

    Background I am a university level psychologists-come-English-conversation teacher, that directs student psychology even though I don't have much...

    Started by timtak‎, 10-23-2014 03:10 AM
    correlation, pearson's r
    • Replies: 4
    • Views: 204
    10-23-2014, 09:21 AM Go to last post
  4. Mixed-effects logistic regression model for a 10-step continuum

    Hello, I am trying understand how to correctly build a mixed-effects logistic regression model in R. I believe my model is pretty simple and...

    Started by statfail‎, 10-22-2014 11:09 PM
    logistic regression, mixed-effects, psychology
    • Replies: 0
    • Views: 145
    10-22-2014, 11:09 PM Go to last post
  5. Question: what statistical test to use to measure cooperation (prisoner's dilemma)

    Hi. I'm an undergraduate student and I've designed an experiment for one of my capstone courses, but I'm not sure quite how to analyze the...

    Started by cds08097‎, 10-22-2014 12:05 PM
    chi squared, cooperation, language, prisoners dilemma
    • Replies: 0
    • Views: 140
    10-22-2014, 12:05 PM Go to last post
  6. Categorical data analysis for within subjects design

    Hi, I hope someone here would be able to help. I conducted an experiment with within subjects design with 2 independent categorical variables...

    Started by AJ0‎, 10-22-2014 10:50 AM
    • Replies: 0
    • Views: 108
    10-22-2014, 10:50 AM Go to last post
  7. Error Simulation Curves - Non-metric MDS

    Hi Can anybody give any hint about how to make the simulation curves of error for different dimensionalities in non-metric multidimensional...

    Started by MDSnewbie‎, 10-21-2014 10:22 AM
    • Replies: 0
    • Views: 89
    10-21-2014, 10:22 AM Go to last post
  8. Is biological disposition an Independent Variable? What do you think?

    I've been asked to look at the relationship between child attachment in the first year of life and problem behavior at age 10. Also, whether gender...

    Started by roganjosh27‎, 10-21-2014 03:11 AM
    biology, independ variable, independent variable
    • Replies: 1
    • Views: 140
    10-21-2014, 06:49 AM Go to last post
  9. Paired Samples T test or Repeated Measures ANOVA?

    Hi everyone, I am on a tight deadline and could use some input on my proposed analyses for my project. PROJECT: I am administering a novel...

    Started by jmmu‎, 10-18-2014 03:30 PM
    paired samples t-test, pre-post, repeated measure anova
    • Replies: 0
    • Views: 193
    10-18-2014, 03:30 PM Go to last post
  10. Ancova?

    Hi, I would like to determine whether the frequency of a specific word category differs between participants’ oral and written texts, at two...

    Started by Ajna‎, 10-15-2014 06:22 AM
    • Replies: 5
    • Views: 249
    10-18-2014, 06:29 AM Go to last post
  11. T tests vs two way ANOVA?

    You have a quantitative variable (for example general intelligence) and you also have two categorical variables, each of them with two levels, for...

    Started by dmon‎, 10-18-2014 12:57 AM
    • Replies: 1
    • Views: 168
    10-18-2014, 03:02 AM Go to last post
  12. Talking 3 variables are normally distributed - 1 is not - how to transform

    Hi, I have not done transformations before but need to do now. One of my 4 variables is skewed (skewness statistic/skewness stardard error =...

    Started by Helen53‎, 10-15-2014 03:34 AM
    • Replies: 4
    • Views: 223
    10-15-2014, 07:53 AM Go to last post
  13. Comparing pre and post questionnaire percentages

    Hello, I was hoping for some help with the following few questions which I will elaborate more on below. 1) How similar does a sample need to...

    Started by Callum‎, 10-14-2014 10:37 AM
    • Replies: 4
    • Views: 241
    10-15-2014, 04:53 AM Go to last post
  14. Help on our research

    Please help me determine what statistics should we use IV= Dimple Placement/location, 6 kinds of dimple placement EXAMPLE PIC of our...

    Started by ccamiile13‎, 10-14-2014 07:39 AM
    help please, spss, statistical test, test statistic equation
    • Replies: 0
    • Views: 138
    10-14-2014, 07:39 AM Go to last post
  15. Regarding Cohen's d use...

    Hi, I am confused regarding added value of Cohen's d. Consider a case of paired t-test. I calculate the Cohen's d as: mean(vec1) - mean(vec2)) /...

    Started by john.gelburg‎, 10-12-2014 05:27 AM
    cohen's d
    • Replies: 2
    • Views: 240
    10-12-2014, 02:51 PM Go to last post
  16. Partial spearman correlations and normality

    hello I am trying to conduct partial spearman rho correlations with syntax. However, I have different controls for my different variables. For...

    Started by loren27‎, 10-12-2014 07:50 AM
    normality, partial spearman, sample size
    • Replies: 1
    • Views: 177
    10-12-2014, 11:09 AM Go to last post
  17. Item Response Theory vs Confirmatory Factor Analysis

    Hi all, I was wondering what the core, meaningful differences are between Item Response Theory and Confirmatory Factor Analysis. I understand...

    Started by SimonSchus‎, 10-07-2014 09:00 AM
    cfa, irt, philosophy
    • Replies: 5
    • Views: 314
    10-08-2014, 03:48 PM Go to last post
  18. Reverse Scored Items

    I am working on a survey and have included several reverse scored items. I am wondering though if reverse scored items buy anything? Do they...

    Started by trinker‎, 10-08-2014 08:33 AM
    • Replies: 1
    • Views: 177
    10-08-2014, 09:15 AM Go to last post
  19. MDS configuration Stress-1 acceptable value

    Hi I'm trying to do the MDS config. for ACS scale (20 items). I used ordinal model (Proxscal-spss) with primary approach (untied tied...

    Started by MDSnewbie‎, 10-08-2014 08:09 AM
    acceptable, mds, stress-1, values
    • Replies: 0
    • Views: 115
    10-08-2014, 08:09 AM Go to last post
  20. Unhappy non-significant multivariate BUT significant univariate. What to do?

    Hello, I need some urgent help with the following problem. I ran a MANCOVA but the multivariate test (Pillai's trace, wilk's lambda and...

    Started by chatlanid‎, 10-07-2014 12:50 PM
    • Replies: 2
    • Views: 196
    10-07-2014, 04:43 PM Go to last post
  21. Mann-Whitney test -- Large U values

    Hello, I've recently conducted numerous mann-whitney tests and all of the U values appear to be around 15,000 to 20,000. My n's vary between...

    Started by Templean‎, 10-02-2014 12:24 PM
    • Replies: 1
    • Views: 191
    10-06-2014, 07:54 PM Go to last post
  22. Angry Dealing with missing data in Repeated-measures ANOVAs

    Afternoon all, I've been running a longitudinal follow-up study to assess outcomes following a psychological treatment for ME. As to be expected,...

    Started by kal26‎, 10-02-2014 10:31 AM
    anovas, missing data, repeated measures
    • Replies: 3
    • Views: 257
    10-05-2014, 11:51 PM Go to last post
  23. Comparing within-group and outside-group

    Hi All, I want to compare results within a group to see if they are more closely related than random comparisons*. I'm really not sure the best...

    Started by Rob1983‎, 09-30-2014 04:38 AM
    • Replies: 2
    • Views: 171
    09-30-2014, 07:13 AM Go to last post
  24. Parametric vs. Non-parametric tests - what should I present?

    Hi everyone! I would like to have your opinion on this matter. I conducted both parametric and non-parametric MANOVAS for my master's...

    Started by arlp‎, 09-22-2014 12:16 PM
    • Replies: 5
    • Views: 337
    09-27-2014, 12:33 PM Go to last post
  25. Question Comparing two genetic models

    Hi there, I have a question about how to compare two models within SPSS. My problem: I have data acquired for let's say 100 people. My...

    Started by Xeno‎, 09-25-2014 07:47 AM
    • Replies: 4
    • Views: 236
    09-26-2014, 04:09 AM Go to last post
  26. G Theory / Variance Components problems

    I'm running SPSS Variance Components analyses using REML estimation. I have both real and fictitious data in which employees are rated by multiple...

    Started by Uwyze‎, 09-25-2014 10:33 AM
    • Replies: 9
    • Views: 227
    09-25-2014, 12:55 PM Go to last post
  27. Question Is a factor analysis possible on aggregated survey data?

    Hi, All, so I've been asked to help with an analysis and it's not as straightforward as I thought it would be. Background: The company gives...

    Started by SabbyATL‎, 09-25-2014 12:47 PM
    • Replies: 0
    • Views: 125
    09-25-2014, 12:47 PM Go to last post
  28. SEM - Comparing Models with Different Variables

    I am doing some structural equation modeling. I have made one model with 3 exogenous variables predicting 5 endogenous variables and would like to...

    Started by xralphyx‎, 01-31-2013 09:55 AM
    2 Pages
    1 2
    sem fit indices ecvi
    • Replies: 20
    • Views: 2,128
    09-23-2014, 06:58 PM Go to last post
  29. Mixed Design ANOVA (2 x 2 x 3) - Partial Eta Squared?

    I'm so confused! I have completed my thesis, and am being asked to provide the partial eta squared values for the mixed-design ANOVA I performed...

    Started by mackerbuddy‎, 09-22-2014 11:04 PM
    • Replies: 1
    • Views: 141
    09-23-2014, 06:47 AM Go to last post
  30. What test should I run? Repeated measures manova?

    Hello, I'm interested in determining if significant differences exist among consumers' perceptions of their two favorite restaurants on 4...

    Started by ColdPillow‎, 09-18-2014 10:09 AM
    • Replies: 1
    • Views: 228
    09-22-2014, 11:21 AM Go to last post
  31. Latent Growth Curve and covariates

    I'm examining latent growth curves in Mplus. My dependent variable is continuous, measured over three time points. I have a great unconditional...

    Started by reisareno‎, 09-20-2014 09:52 PM
    aic, bic, latent growth curve, mplus
    • Replies: 0
    • Views: 162
    09-20-2014, 09:52 PM Go to last post
  32. Advice on linear regression analysis

    Hi! For my dissertation, I'm conducting a research in which I'm exploring the role of some psychosocial variables (i.e. mindfulness, automatic...

    Started by arlp‎, 09-17-2014 12:26 PM
    • Replies: 5
    • Views: 314
    09-19-2014, 09:23 AM Go to last post
  33. Running non-parametric repeated measures analysis with split file on

    Okay so, I'm currently writing up my thesis, and I've got 2 between group variables and 3 within-group variables. I'm not doing a mixed design...

    Started by Mimi‎, 09-18-2014 08:29 AM
    friedman test, help me!, non-parameteric, split-file, spss
    • Replies: 0
    • Views: 130
    09-18-2014, 08:29 AM Go to last post
  34. sample size in a mixed ANOVA

    I'd like to calculate my sample size for a mixed ANOVA. I have 2 groups in my experiment and within groups I have 3 variables. the first variable has...

    Started by kata‎, 09-18-2014 05:34 AM
    • Replies: 0
    • Views: 114
    09-18-2014, 05:34 AM Go to last post
  35. 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: 17
    • Views: 532
    09-17-2014, 05:06 PM Go to last post
  36. Outliers question for repeated measures anova

    Hi, I just wanted some confirmation because I cannot seem to find a clear answer in any textbook yet. When running a repeated measures anova...

    Started by a.jerovich‎, 09-15-2014 12:10 AM
    • Replies: 0
    • Views: 162
    09-15-2014, 12:10 AM Go to last post
  37. decision making

    is decision making related to psychology???

    Started by haraharae‎, 09-12-2014 12:47 PM
    • Replies: 2
    • Views: 206
    09-12-2014, 01:53 PM Go to last post
  38. RMSEA impacted by high reliability scores..

    Hello again Sorry - In relation to running Confirmatory Factor Analysis - I'm wondering whether someone is aware of RMSEA being impacted by...

    Started by anon2000‎, 09-11-2014 03:07 AM
    cfa, model fit, reliability, rmsea
    • Replies: 12
    • Views: 303
    09-12-2014, 02:25 AM Go to last post
  39. post hoc/planned comparisons, what's ok and what's not ok?

    Hi, first time here and hoping you guys can help. I am working on a few analyses for my PI. The problem is that she knows nothing about stats and...

    Started by loust‎, 09-11-2014 07:17 PM
    • Replies: 0
    • Views: 124
    09-11-2014, 07:17 PM Go to last post
  40. Multilevel Linear Modelling Help

    Hi, I'm hoping someone with expertise with MLM/HLM etc might be able to help me. I recently conducted a transmission chain study looking at the...

    Started by freofan‎, 09-09-2014 09:50 PM
    fixed effects, hlm, mlm, random effects
    • Replies: 6
    • Views: 308
    09-10-2014, 11:10 PM Go to last post
  41. Factor Analysis and correlated measurement errors

    Hi, I am planning to do an experiment which seeks to measure two latent constructs related to different types of cognitive processing. For each...

    Started by Scarlatti‎, 09-09-2014 08:37 PM
    • Replies: 0
    • Views: 124
    09-09-2014, 08:37 PM Go to last post
  42. Multiple Dependent Variables and Multiple Time Points?

    Hello! I have a question about how to analyze my data. I have two groups, experimental VS control and 4 different measures related to various...

    Started by will22‎, 09-06-2014 01:33 PM
    • Replies: 0
    • Views: 179
    09-06-2014, 01:33 PM Go to last post
  43. Negative ICC values in SPSS

    Hi there, I have run an ICC to assess if scores for 5 dimensions of a quality of life scale have been rated the same by child and their parent....

    Started by Tazmes‎, 09-06-2014 08:33 AM
    icc, negative, spss, spss 21, variance
    • Replies: 0
    • Views: 152
    09-06-2014, 08:33 AM Go to last post
  44. Indirect and direct effects with multiple imputation (MIANALYZE)

    Hi all, I'm using SAS, doing some SEM with multiple imputation (PROC MI).. I can pull out almost everything I need using PROC CALIS and the PATH...

    Started by SimonSchus‎, 09-04-2014 02:46 PM
    • Replies: 0
    • Views: 163
    09-04-2014, 02:46 PM Go to last post
  45. Binomial Logistic Regression classification tables contradicted by chi square value?

    Hi, I have been attempting to run a binomial logistic regression to establish whether maternal anxiety status (anxious or non-anxious) and child...

    Started by Goldie09‎, 09-03-2014 10:24 AM
    • Replies: 0
    • Views: 157
    09-03-2014, 10:24 AM Go to last post
  46. Can I use "mixed ancova with repeated measures" in this case?

    Hi everybody, I have 4 separated groups (4 different interventions), and I measured the dependent variable over 4 time points. I considered my...

    Started by roshanak‎, 09-02-2014 01:10 PM
    • Replies: 0
    • Views: 171
    09-02-2014, 01:10 PM Go to last post
  47. Analysis for behavior change over sample treatments

    Hello all! My research examined if social behaviors in animals changed with the distribution of food treatment (clumped vs. dispersed food). My...

    Started by caddyhair‎, 08-31-2014 01:13 PM
    behavioural data, matrices, matrix, matrix data, social network
    • Replies: 3
    • Views: 282
    09-02-2014, 12:56 AM Go to last post
  48. Minimun sample for a Mann-Whitney U test

    Hello! :wave: What is the minimun sample per group for a Mann-Whitney U test? I appreciate if you give also a reference about it Thanks!

    Started by dmon‎, 08-29-2014 06:48 PM
    mann-whitney test, sample size
    • Replies: 1
    • Views: 256
    08-30-2014, 02:12 AM Go to last post
  49. Moderation Analysis

    Hi, Got a question for moderation analysis. In Step 2 where I entered the interaction term, the R^2 change = .064, F(3, 73)=1.848, p = .146, was...

    Started by ccy‎, 08-29-2014 06:51 PM
    • Replies: 1
    • Views: 178
    08-29-2014, 07:34 PM Go to last post
  50. Basic question: linear trend effect on one-way ANOVA

    Dear experts, I have a quite basic question, when doing a one-way ANOVA (4 groups) in SPSS, if i don't find a significative effect (F test), does...

    Started by S_CALVIN‎, 08-26-2014 07:49 AM
    • Replies: 0
    • Views: 195
    08-26-2014, 07:49 AM Go to last post
  51. Question Intraclass Correlation Coefficient Types

    I have two datasets in which I probably need to use the intraclass correlation coefficient, and I want to make sure I choose the right type. ...

    Started by noober‎, 08-25-2014 07:02 PM
    data analysis, icc
    • Replies: 0
    • Views: 158
    08-25-2014, 07:02 PM Go to last post
  52. Nested vs non-nested model?

    Hi all, I am running a confirmatory factor analysis and trying to work out if my two models are nested or not - this will be important for me to...

    Started by SimonSchus‎, 08-25-2014 02:30 PM
    amos, cfa, models, nested, sem
    • Replies: 2
    • Views: 206
    08-25-2014, 03:28 PM Go to last post
  53. Random Sample Assumption Violation and Chi-Square/Reg: Ordinal and Nominal Data

    Hello Everyone, I'm a grad student in biostatistics and am currently working at my first job with real world data. I'm analyzing survey data...

    Started by doughnut1‎, 08-20-2014 01:31 PM
    assumptions, chi square?, ordinal and categorical, violation
    • Replies: 2
    • Views: 324
    08-20-2014, 05:37 PM Go to last post
  54. Steps for evaluate factorial invariance in AMOS

    Steps to evaluate factorial invariance Hi! I have to compare a model in samples of two countries, I have to run a factorial invariance analysis...

    Started by dmon‎, 08-20-2014 04:52 PM
    amos, construct validity, factorial invariance
    • Replies: 0
    • Views: 269
    08-20-2014, 04:52 PM Go to last post
  55. Categorical Moderator Regression

    Hi, I am trying to do a moderation analysis with: IV: Depressive symptoms Moderator: Condition (threat vs no threat) DV: Closeness with...

    Started by ccy‎, 08-17-2014 06:57 PM
    • Replies: 2
    • Views: 260
    08-18-2014, 08:01 PM Go to last post
  56. Inquiry about the moderated mediation, real hurry

    Hello everyone and thank you for your attention. I am now facing the problem of moderated mediation interpretation. Here is the background: ...

    Started by erikye‎, 08-18-2014 02:05 PM
    • Replies: 0
    • Views: 140
    08-18-2014, 02:05 PM Go to last post
  57. 2X2X2 design.. what statistics should I use?

    Hi, I am doing a research with a 2X2X2 design: Between subjects (Positive Mood VS Negative Mood) Within subjects (Positive Stimuli 1 VS Negative...

    Started by TiffanyReed‎, 08-18-2014 10:24 AM
    ancova, anova, research, statistics
    • Replies: 0
    • Views: 151
    08-18-2014, 10:24 AM Go to last post
  58. Which type of ANOVA to choose: split plot repeated measures or alternative?

    Hi all, I'm new to this forum but not to statistics. There's just this problem I can't get my head around, I hope someone can help me. In my...

    Started by Cis‎, 08-09-2014 05:01 PM
    • Replies: 6
    • Views: 301
    08-18-2014, 10:10 AM Go to last post
  59. Breaking-down main effect to examine demographic differences

    I showed videos of musical performances which where visually different, but the sound was identical. Participants graded both the appearance of the...

    Started by PaulC‎, 08-15-2014 08:21 PM
    interaction effects
    • Replies: 1
    • Views: 168
    08-17-2014, 06:04 PM Go to last post
  60. Estimating and using reliability metric with the same data

    Hi, I'd like to know if it is reasonable to use the same set of data to estimate and use a reliability metric from repeated measures? I am mostly...

    Started by Themistocle‎, 08-15-2014 03:17 PM
    reliability measurement
    • Replies: 0
    • Views: 167
    08-15-2014, 03:17 PM Go to last post

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