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# Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

• Replies: 0
• Views: 32,186
11-10-2005, 12:21 AM
1. ### experiemental items in factor analysis

Good morning, everyone. We are analyzing a questionnaire data set, which has some core items and some experimental items. The core items are those...

• Replies: 0
• Views: 1,276
09-21-2015, 09:32 AM
2. ### Calculating Partial Correlation from Published Work

I am working on a meta-analysis, and I read in a published meta-analysis that the researchers calculated partial correlations controlling for two...

• Replies: 1
• Views: 1,530
09-21-2015, 02:40 AM
3. ### Calculating effect size at T2 while controling for baseline differences.

Hi Everyone, I would really appreciate some pointers how I might calculate a treatment V control effect size at T2 (using means, SD's, and sample...

• Replies: 0
• Views: 1,246
09-20-2015, 10:56 AM
4. ### Transforming a negatively skewed ikert scale dependent variable for ANOVA and M.Reg

Hello, I have a negatively skewed Likert scale as my dependent variable and would like to use parametric testing (multiple regression and ANOVA)....

• Replies: 4
• Views: 1,562
09-19-2015, 05:01 PM
5. ### Mixed method ANOVA post hoc confusion?

My experiment had a between-subjects variable of condition (experimental and control) and a within-subjects variable of time (baseline and follow-up...

• Replies: 1
• Views: 1,055
09-19-2015, 01:25 PM
6. ### How to measure- effect of additional categorical DV on repeated m. ANOVA?

Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly...

• Replies: 4
• Views: 1,418
09-19-2015, 01:03 PM
7. ### HELP PLEASE :) ANOVAs repeated measures

More I read more I get confused, so please help me ! 1. In 2 (2 conditions)x2 (2 time intervals) within subjects Anova if normality assumption is...

• Replies: 0
• Views: 1,112
09-18-2015, 03:47 PM
8. ### Query on item response theory. Pls help

When an examination involving 250 multiple choice questions is being evaluated by item response theory , and the candidates ability score is being...

• Replies: 0
• Views: 1,172
09-13-2015, 07:10 AM
9. ### Detect possible subgroups in sample

Hi, My data consist of the total scores from a questionnaire (N=700). The distribution is somewhat negatively skewed, however there appears to be...

• Replies: 2
• Views: 1,543
09-10-2015, 05:09 AM
10. ### Psychology textbook error regarding stats?

Hi all, I'm teaching a community college psychology class this semester out of a new textbook, and the book contains this claim: My first...

• Replies: 6
• Views: 1,834
09-10-2015, 12:27 AM
11. ### Sum of Squares

My homework problem says: For the following summary statistics, find ∑X and SS (sum of squares) a. XBar = 25, s = 10, n = 11 So,I have that...

• Replies: 1
• Views: 2,567
09-07-2015, 01:53 PM
12. ### SEM with categorical variable/parceling/how to enter in AMOS?

I need to do an SEM and I'm stumped about what to do with one of my variables, which is a nominal categorical variable (previous experience in x vs....

• Replies: 32
• Views: 19,614
09-07-2015, 06:00 AM
13. ### Help with the level of measurement for correct/incorrect answers

Please, help bring in some lucidity and fill in any possible gaps in my reasoning. The research assessed the participants' recall of a narrative...

• Replies: 17
• Views: 8,535
09-04-2015, 03:27 PM
14. ### What statistical analysis to use?

HI, Each of the participants completed 7 tasks. I collected several measures in each task (like answer correctness, perception of difficulty, time...

• Replies: 2
• Views: 1,953
09-04-2015, 04:01 AM
15. ### [R - Lavaan] Which estimator for confirmatory factor analysis?

Hi, Currently I am using Rstudio with the Lavaan package in order to perform a confirmatory factor analysis (CFA) on a dataset (N = ~ 700, 23...

• Replies: 0
• Views: 1,324
09-04-2015, 01:56 AM
16. ### Forest plot help

Hello there, I am calculating effect sizes for a forest plot. The RCTs I am using each have several outcome measures (e.g. PARS, SRS, ADIS, MASC,...

• Replies: 0
• Views: 2,026
08-28-2015, 09:40 AM
17. ### measuring Construct Validity

Hi! I'm reviewing a psychological assessment battery that is currently under preparation, and am concerned about the method used by the developers to...

• Replies: 2
• Views: 1,037
08-28-2015, 06:55 AM
18. ### Need help planning analysis of longitudinal survey data

Hi all, I'm working on a project that is investigating a number of things about art teachers in the years following their completing of a...

• Replies: 1
• Views: 967
08-28-2015, 12:03 AM
19. ### repeated measure with some people quit in mid-way

Never mind. Got answered from another SPSS forum.

• Replies: 4
• Views: 1,998
08-27-2015, 06:15 PM
20. ### Data fit for latent profile analyses?

I was wondering on how you decide whether data is suitable for latent profile analysis. By that I mean both the assumptions that need to be met, and...

• Replies: 0
• Views: 1,169
08-27-2015, 08:55 AM
21. ### Repeated Measure ANOVA with muliple samples per participant

I am currently doing an experiment where I measure the time it takes for a participant to complete a task. There are 7 different modes for the task...

• Replies: 2
• Views: 957
08-25-2015, 02:37 PM
22. ### Compare multiple measures in a one-within dyad design

Hello everyone, I have a dataset of 50 heterosexual couples, in which the women have a medical condition and the men do not. This suggest that I...

• Replies: 0
• Views: 1,604
08-25-2015, 11:39 AM
23. ### Which Statistical method or test to use ?

Hello, Currently I am pursuing a degree in Psychology through distance mode. I am studying on my own as of now and taking help of internet. The...

• Replies: 1
• Views: 1,309
08-25-2015, 02:43 AM
24. ### Grand mean vs meaning individual data points?

Hello, I'm running an experiment in which I take a measure (reaction time) repeatedly from a human subject. The reaction time is measured at 3...

• Replies: 1
• Views: 2,031
08-21-2015, 11:04 AM
25. ### Too few responses to my questionnaire, sample too small for factor analysis?

Hi there, For my MSc. dissertation, I've administered a questionnaire and only had 69 usable responses. The questionnaire is made up of 6 factors,...

• Replies: 3
• Views: 1,734
08-19-2015, 12:44 PM
26. ### Mediation analysis for two correlated mediators

Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the...

• Replies: 2
• Views: 1,700
08-18-2015, 01:47 PM
27. ### Dealing with a strong ordering effect

Hello, I'm conducting a study in which people have to judge a perceptual effect (by rating it on a 10 point continous scale). I have three levels...

• Replies: 0
• Views: 1,126
08-17-2015, 04:00 AM
28. ### Unequal variance

I have a within group IV (before and after) and Between group DV (control and experimental) for 25 participants (I had a 40% attrition rate). All of...

• Replies: 0
• Views: 1,046
08-14-2015, 06:44 AM
29. ### When the 3-way interaction is insignificant

Hi, I have a 3 way-mixed design ANOVA. If the 3-way interaction is insignificant but all the 2-way are, can I still analyze them? If I have some...

• Replies: 1
• Views: 1,622
08-09-2015, 05:32 AM
30. ### Comparing means between sample and subsample

I would like to compare the mean score on personality questionnaire between my total sample (n=97) and my subsample (n=44) to see if there is a...

• Replies: 6
• Views: 4,533
08-05-2015, 10:50 AM
31. ### Dichotomizing continuous variables for an EXPERIMENT not a survey

I am aware of the many issues/pitfalls with splitting continuous variables in survey research. Nothing I have read addresses whether doing so to...

• Replies: 13
• Views: 2,359
08-04-2015, 05:13 PM
32. ### Null hypothesis significance testing in psychology research

Interested in learning more.

• Replies: 9
• Views: 2,060
08-03-2015, 05:29 PM
33. ### R2 test with Model II error

In Jacob Cohen's "Statistical power analysis for the behavioral science" (2nd edition, 1988), page 409, 411-412, it mentions a F test with Model II...

• Replies: 3
• Views: 695
08-03-2015, 09:22 AM
34. ### Factor Analysis Question

Hi, My research team and I ran two separate confirmatory factor analyses on two separate measures (same participants filled out both self-report...

• Replies: 0
• Views: 1,381
08-03-2015, 01:09 AM
35. ### understanding published results (a median of 0 ???)

hello everyone, appoligies if this is a strange question but we can not grasp the meaning of the following statement published in an English paper....

• Replies: 4
• Views: 1,627
07-30-2015, 10:16 AM

Hello, I am new to LCA and attempting to design a secondary data study utilizing LCA as to show latent classes (subtypes) of a specific disorder...

• Replies: 0
• Views: 1,300
07-30-2015, 01:44 AM
37. ### Ordinal or interval survey response analysis (from a convenience sample)

I have the responses from a survey where people had to provide a rating on a scale from one to five, where five was most positive side of things. I...

• Replies: 9
• Views: 2,741
07-28-2015, 11:02 AM
38. ### Correct way to treat data for pearson correlation

Hello everyone I run into the following issue - I had both teachers and pupils rate their beliefs on a likert scale from 1 to 6. I want to check...

• Replies: 3
• Views: 1,695
07-28-2015, 09:59 AM
39. ### Likert Scale Data Question

Hi! I am working with Likert Scale Data (1-5) collected for two different sets of subjects. We have data collected from one school, at two...

• Replies: 2
• Views: 2,656
07-27-2015, 10:24 AM
40. ### Between Subjects Experimental Design- How to analyse

I have conducted an experiment with 2 conditions, 50 people in each condition. Each person completed a booklet of tasks and self-report measures (the...

• Replies: 1
• Views: 1,121
07-27-2015, 10:17 AM
41. ### Types of interactions

Hi, I am stuggling to find the right words for the statistical terms I would like to look up. Hope, you can help :-) I am looking at a higher...

• Replies: 2
• Views: 1,323
07-27-2015, 08:46 AM
42. ### Presentation and interpretation of frequency data

I carried out a study which involved going through a pathological cohort of 97 patient case files retrospectively and rating whether 21 behavioural...

• Replies: 2
• Views: 1,027
07-23-2015, 12:27 PM
43. ### Advice on which statistical test

Dear Stats Friends I am a UK Clinical Psychology Trainee carrying out a small (5000 words) service improvement project based on where I am on...

• Replies: 8
• Views: 1,689
07-20-2015, 04:13 PM
44. ### Chi square and player order as a variable

Hi all, I am getting myself in a muddle trying to use chi square correctly and hoping someone here can help. I am trying to see if there is an...

• Replies: 2
• Views: 1,338
07-17-2015, 01:27 AM
45. ### Interpretation and reporting of dummy variables in causal model (Amos/SEM)

I am using Amos to conduct SEM. The model I am running has a control variable with several categories for religion. I've used dummy variables to...

• Replies: 3
• Views: 1,889
07-15-2015, 05:54 PM
46. ### 2 x 3 (Repeated Measures?) ANOVA

Hi guys! I would be very grateful if someone could just doublecheck my choice of data analysis. This is for a dissertation, and I do not have the...

• Replies: 0
• Views: 1,194
07-14-2015, 05:58 AM
47. ### Help with interpretation

Hi All, Here is what i need help with. I am working with small sample size and this is the result so far. X and Y are not correlated ; however,...

• Replies: 4
• Views: 2,152
07-13-2015, 11:08 AM
48. ### Comparing two groups with two data sets? Is multiple regression test conveniant

Hi I was wondering if someone could direct me to the right area.. I have currently done my research, where I wanted to find out the causal...

• Replies: 0
• Views: 1,090
07-12-2015, 10:03 PM
49. ### Comparing three percentages (not means) which test [spss]

Hello I wonder if you can help I am having trouble working out which statistical test to use. I have conducted a TMS study with four participants....

• Replies: 0
• Views: 1,155
07-11-2015, 06:46 AM
50. ### differences between different levels of ordinal variables (repeated measures)

Hi all, I'm writing my thesis at the moment and I've come across a problem that I'm not sure how to solve. Maybe i'm just too focussed on it to...

• Replies: 1
• Views: 1,509
07-03-2015, 08:57 AM
51. ### imputation on ordinal varibales (likert scale) missing values

We have some survey data, and some questions were left answered. When I tried to do multiple imputation, I got the message: The imputation model...

• Replies: 3
• Views: 1,605
07-02-2015, 10:16 AM
52. ### Big Data

In a surveillance society, are there now computer-aided methods way more sophisticated than Factor Analysis such that no piece of info about any...

• Replies: 10
• Views: 3,635
07-01-2015, 12:12 PM
53. ### normality problem

I have 15 dependent variables on on IQ measure am using in my study but after checking for skewness and kurtosis two of them are not normally...

• Replies: 3
• Views: 1,753
06-29-2015, 06:32 PM
54. ### comparing two independent binomial data sets, unequal size, Welchs t-test?

I would like to compare the pass rates of two different classes (say English 111 and English 113). The data is binomial (0= fail, 1=pass). The sets...

• Replies: 3
• Views: 2,715
06-29-2015, 10:02 AM
55. ### HELP! 4x2 Mixed Design ANOVA Post Hoc Tests

Hi all, I'm a PhD student and for my most recent study I conducted a 4 (experimental condition) x 2 (emotion type) mixed design ANOVA with...

• Replies: 0
• Views: 1,222
06-29-2015, 09:19 AM
56. ### dependence of measures

What to do with lack of independence in measures? What would you do if there's a correlation among measures? I am comparing a group of 20...

• Replies: 1
• Views: 1,169
06-28-2015, 02:28 AM
57. ### grouping participants together to form 1 group

Hi sorry for the silly question:shakehead but I need some help I have 3 groups of participants in groups A, B and C but due to the small population...

• Replies: 0
• Views: 1,297
06-27-2015, 11:04 AM
58. ### SEM modelers and R users: lavaan, sem or OpenMX?

hey out there to all SEM and R users... just wanted to conduct a quick, informal poll about which R package do people consider is the best suited to...

• Replies: 10
• Views: 13,659
06-26-2015, 09:08 AM

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