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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: 15,171
11-09-2005, 11:21 PM
1. ### 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: 121
07-03-2015, 08:57 AM
2. ### 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: 164
07-02-2015, 10:16 AM
3. ### 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: 509
07-01-2015, 12:12 PM
4. ### 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: 157
06-29-2015, 06:32 PM
5. ### 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: 192
06-29-2015, 10:02 AM
6. ### 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: 73
06-29-2015, 09:19 AM
7. ### 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: 117
06-28-2015, 02:28 AM
8. ### 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: 81
06-27-2015, 11:04 AM
9. ### 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: 5,329
06-26-2015, 09:08 AM
10. ### Relationship between 2 measures - simple correlation or which test?

Hi, I would like to know if 2 measures are related or not across development - this is my question. I have 8 developmental age groups (from 5...

• Replies: 0
• Views: 78
06-26-2015, 06:45 AM
11. ### Factor Analysis Repeated Measure ANOVA Between Subjects

I conducted an experiment with 199 participants with each exposed to 36 different image and sound combinations (12 images x 4 sounds). They rated...

• Replies: 0
• Views: 105
06-24-2015, 10:46 AM
12. ### Factor analysis with Likert-scale justifiable or not in this situation?

Hello my name is Ramon, and I'm new to the forum, I'm currently finishing my master's thesis, and have a question about one of my analyses. ...

• Replies: 1
• Views: 146
06-24-2015, 05:48 AM
13. ### The effects of transforming skewed data

Hi There, I would like to know more about transforming data. I know that for parametric statistics data needs to be normally distributed, but I am...

• Replies: 3
• Views: 201
06-22-2015, 09:42 AM
14. ### repeated measure ancova

Hi, I do have a rather simple question but could not find a direct answer on other forums. I ran a repeated measures ancova with time (2) as...

• Replies: 4
• Views: 240
06-20-2015, 05:25 PM
15. ### Help with botched thesis data and analysis design

Hi, I need help making sense of what I can do to analyze the data I have for my thesis. I was conducting a mixed methods study within a school to...

• Replies: 2
• Views: 214
06-19-2015, 09:37 PM

I am looking at conducting some initial exploratory research and I am considering which tests to use for analyses of the quantitative data - but I am...

• Replies: 1
• Views: 222
06-19-2015, 09:09 PM
17. ### difference between item parceling and factor analysis?

I seldom see people use item parceling but heard a lot of factor analysis. what is purpose of item parceling?

• Replies: 0
• Views: 79
06-18-2015, 09:04 AM
18. ### Dividing a variable in three groups, what method to use?

Hi all, For my research, I had all my respondents fill in a quiz and I calculated their scores (ranging from 0 to 10). I want to divide the whole...

• Replies: 0
• Views: 77
06-17-2015, 09:13 AM
19. ### Bonferroni Adjustment and Assumptions

Hello, I'd just like to get clarification on something. When you perform a bonferroni adjustment (dividing the alpha level by the amount of tests...

• Replies: 3
• Views: 367
06-15-2015, 08:22 AM
20. ### Model-based cluster analysis in spss?

Greetings everyone. I recently conducted a study on attitude towards pain and psychopathy. I gathered the data of 609 participants on the PPI-SF...

• Replies: 0
• Views: 147
06-11-2015, 12:47 PM
21. ### 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: 4
• Views: 267
06-09-2015, 12:16 PM
22. ### Test for predictions/likelihood

Hi All! I have two vaiables: 1) Collision with a lead vehicle (Yes/No) and 2) Reaction Time (Scale). I'd like to know whether, in SPSS, there is a...

• Replies: 1
• Views: 278
06-05-2015, 01:23 PM
23. ### Relative measure in a questionnaire

Hello everyone, I have a psychological questionnaire which deals with people's satisfaction from life. The questionnaire is build from several...

• Replies: 0
• Views: 141
06-03-2015, 10:43 PM
24. ### Reliability between sets - is the intraclass correlation coefficient appropriate?

Hi, I am having trouble applying the ICC to data I have collected for my Masters thesis. I have collected 8 sets (of 30 samples) from 40+...

• Replies: 1
• Views: 201
06-03-2015, 11:35 AM
25. ### Test for association: Categorical data vs Continuous data

Hi! I am trying to understand whether and what statistical test I can carry out in SPSS to see if there is an association between two independent...

• Replies: 2
• Views: 160
06-03-2015, 05:35 AM
26. ### Replication: Strange flip of signs in regression

Dear all, I have successfully run an experiment 2 times. I predicted an interaction between a dummy variable (intervention 1-yes/0-no) and a...

• Replies: 0
• Views: 92
06-03-2015, 03:46 AM
27. ### Help with test selection for study

Hi everyone, I'm looking for some help around the appropriate test selection, since I am collecting my own data. Here is some background: 1....

• Replies: 2
• Views: 282
06-02-2015, 09:57 PM
28. ### how to do a contrast analysis for an interaction between two within subjects effects?

Hello! I have a quite simple data pattern but find it hard to test a specific contrast I expected. I have 2 within subjects factors, each with two...

• Replies: 27
• Views: 6,135
06-01-2015, 05:45 PM
29. ### Regression analysis to compare groups

I recently submitted a paper in which I split scores on a psychometric variable at the mean to produce high and low score groups and then used...

• Replies: 1
• Views: 181
06-01-2015, 12:57 AM
30. ### Preliminary data analysis for Logistic regression - Help please!!!

Hi everyone, I am stuck at the preliminary analysis of my data and I need your ideas and help please. Here a small overview of my study: 1....

• Replies: 0
• Views: 190
05-30-2015, 05:50 PM
31. ### Testing for Attrition Bias, within/between? Type 1 Error, Bonferroni Adjustment

Hello, My study consists of one IV (group treatment). A main treatment, and a control treatment, and four DVs (mental health measures,...

• Replies: 2
• Views: 136
05-28-2015, 07:50 AM
32. ### Help with our data analysis (which one?!)

Hey folks, hope this is the right place... Ok, so we aren't completely sure if we have the right data analysis type, so it would be awesome if you...

• Replies: 2
• Views: 267
05-26-2015, 06:12 AM
33. ### mean+/-2.5 sd to remove outliers

Hi everybody. I'm looking for a smart answer to this question: "Provide a justification of using 2.5 standard deviation (and not 3 o 2) for...

• Replies: 1
• Views: 218
05-26-2015, 06:01 AM
34. ### Homogeneity Of Variances assumption in ANOVA use Levene's AND Box's test?

Hello, I am carrying out a Mixed between-within subjects analysis of variance, following Pallant's (2011) instructions. The chapter I am...

• Replies: 2
• Views: 290
05-25-2015, 03:43 PM
35. ### Bonferroni Adjustment/Correction and Confidence Intervals

Hello, I have two questions here. RESOLVED (for now): You perform the bonferroni for multiple tests and/or multiple comparisons. FIRST: I...

• Replies: 13
• Views: 503
05-25-2015, 12:23 PM
36. ### Difficult Ranking/Regression Problem

Hello. I am trying to work out how well a number of independent variables predict the probability of being perceived to be good at a certain task. ...

• Replies: 0
• Views: 201
05-20-2015, 12:36 PM
37. ### HLM- daily diary data for lagged analyses, controlling for DV at t-1?

Hi all, I have a dataset that consists of daily observations (21 days) of people's daily general mood and daily life satisfaction. I am interested...

• Replies: 2
• Views: 241
05-19-2015, 11:27 PM
38. ### really dumb/basic question about repeated-measures design

Let's say I did a repeated-measures experiment with 2 conditions and I counterbalanced. If my data were in SPSS, what would be the easiest/usual way...

• Replies: 0
• Views: 180
05-18-2015, 12:26 PM
39. ### No post-hoc tests for Mixed between-within subjects ANOVA aka split-plot ANOVA ?

Hello, I am performing some "mixed between-within subjects ANOVAs" aka "split-plot ANOVAs" aka "SPANOVAs". I am following Pallant 2011. ...

• Replies: 4
• Views: 221
05-15-2015, 12:37 PM
40. ### Paired/Matched Sample Question

Hello Everyone, I would greatly appreciate some help with this question. I am trying to help a good friend with her dissertation and am now...

• Replies: 0
• Views: 134
05-14-2015, 05:04 PM
41. ### 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: 31
• Views: 3,888
05-14-2015, 04:21 AM
42. ### z scores to percentiles

Question 5 Identify the case with the lowest z score. Refer to Appendix A in the Warner (2013) text. Interpret the percentile rank of this z score...

• Replies: 3
• Views: 1,098
05-08-2015, 03:19 PM
43. ### Different number of cases for each participant - correlate with background data?

I'm new to statistics so sorry about my lack of knowledge, but hey that's why I'm here! I have a long data set containing cases of survey...

• Replies: 4
• Views: 273
05-05-2015, 06:36 AM
44. ### Repeated measures ANOVA; missing data and multiple measures at each time point

Hi TalkStats I have data from a project. The data is the blood pressure for each participant at day of "baseline" visit, and 3 time points after...

• Replies: 2
• Views: 219
04-27-2015, 09:19 AM
45. ### ANOVA post-hoc tests: Bonferroni, LSD, or Tukey?

Hi guys, Not knowing much on the differences between the above tests, which would you recommend for my ANOVA post hoc tests? I was using...

• Replies: 9
• Views: 25,093
04-26-2015, 08:05 PM
46. ### Validating a scale

Hello! I am trying to provide statistical support for the validity and reliability of a scale. There is only one construct being sought (student...

• Replies: 0
• Views: 173
04-25-2015, 03:09 PM
47. ### IV problem of MANOVA

Hi everybody, How can we know how many IVs can we put in MANOVA? I have 1 DV with 3 groups, and as IV, the neuropsychological test (CERAD)...

• Replies: 0
• Views: 195
04-24-2015, 09:43 AM
48. ### Bi-Factor CFA in LISREL help needed

Hi, I'm attempting to run a bi-factor CFA with LISREL 9.1. I have 26 ordinal items with one general factor (e.g., total score for the scale)...

• Replies: 1
• Views: 224
04-23-2015, 11:53 PM
49. ### Longitude data help needed

I have collected data at Time 1 and Time 2. The data consists of three questionaires, 1 --> DV= as numeral score on a scale of 1 to 6 or frequency...

• Replies: 4
• Views: 339
04-22-2015, 03:35 PM
50. ### Which test should I run?

Hello everyone, my data were collected from different groups of participants. More specifically, my study had a baseline and several experimental...

• Replies: 3
• Views: 325
04-21-2015, 07:46 AM
51. ### puzzling results when contrasting conditions in 3 x 2 design

Hi everyone, I'm encountering something puzzling when analyzing my data. My data consists out of 2 independent variables and one dependent...

• Replies: 0
• Views: 185
04-20-2015, 05:00 AM
52. ### Single subject Kruskal Wallis Test

Hello, I posted a while ago about a statistics conundrum I was having. I think I may have solved it but I wanted to check with some statistics...

• Replies: 3
• Views: 403
04-15-2015, 06:43 AM

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