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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: 26,166
11-10-2005, 12:21 AM
1. ### chi square test

Say that we have 3 trials. On each trial, we are trying to verify whether for each stimulus X, we have a reponse Y. For example I have a rat and...

• Replies: 2
• Views: 923
07-27-2014, 02:01 AM
2. ### Selecting an experimental design

Hi everyone, I am designing an experiment where I manipulate the composition of a 3 person group. For example, the number of freshmen per group,...

• Replies: 0
• Views: 696
07-26-2014, 10:33 PM
3. ### interpreting ModMed results

Can we interpret ModMed results if our indirect effect is significant (Class Intervals don't include zero) but our interactions are not significant...

• Replies: 2
• Views: 868
07-24-2014, 04:05 AM
4. ### Interpreting Mediation results

Hello, I have a few questions regarding interpretation of my results for Mediation using Hayes' Process macro. The key point for finding...

• Replies: 0
• Views: 2,520
07-24-2014, 02:25 AM
5. ### help with choosing the right statistics tests :)

Hello! I'm currently studying my Masters and struggling with working out which statistical tests I'm using. I'm basically looking into a 30-day...

• Replies: 5
• Views: 1,156
07-22-2014, 10:14 PM
6. ### Missing Data - Scale Validation

Hi everyone, I am working to validate a 10-item scale, 5-point Likert response format in a sample of 673. Trying to find a "happy medium" for all...

• Replies: 6
• Views: 1,330
07-22-2014, 07:37 PM
7. ### Interpreting multiple mediations: significant total, but n.s. individual mediation

Hi, I have a question about interpreting a result I've just discovered using Hayes's INDIRECT and PROCESS macros for SPSS. So, I have a variable X...

• Replies: 1
• Views: 1,000
07-21-2014, 05:27 PM
8. ### Multilevel modeling - how to code individually varying time?

I have data with a unique time structure - it measures hand washing compliance throughout a provider's shift during each patient encounter. We know...

• Replies: 1
• Views: 795
07-21-2014, 03:27 PM
9. ### Age and gender effects in neuropsychological tests

Dear friends, I will try to ask it simple: Dependant variable: scores of a cognitive test (scale) independant variables: brain atrophy (yes,no),...

• Replies: 3
• Views: 794
07-21-2014, 02:18 AM
10. ### Longitudinal data analysis with missing data points

Hey, I am doing a study with event-related potentials on grammatical perception in infants. I have a longitudinal design, I measured the infants at...

• Replies: 1
• Views: 817
07-17-2014, 08:16 AM
11. ### ITT and per protocol analyses. How to do both and how to compare baseline measures.

Hello, I have read about but cannot find the answer to my queries. I am doing a study looking at the effects of positive thinking (PT) and...

• Replies: 5
• Views: 3,917
07-16-2014, 10:33 PM
12. ### Chi-square Vs. Fisher's exact test (FET)

I'd really like to have a statistician answer this because I cannot find the answer anywhere. Perhaps you could be kind enough to direct me towards...

• Replies: 20
• Views: 94,713
07-16-2014, 10:01 PM
13. ### Linear regression or multivariate regression?

Hi there, I am pretty much a newbie in statistics and I hope you can help. I have an experimental design where I analyze three time-windows before...

• Replies: 2
• Views: 1,148
07-15-2014, 12:09 AM
14. ### Lower and upper critical r meaning on a sample size calculation using G*Power

Hello everyone! :) First of all, please excuse my English grammar errors/misspelling; I am a Frenchie who can’t find an answer on French forums......

• Replies: 2
• Views: 1,744
07-10-2014, 09:53 AM
15. ### type one error adjustment - Friedman test Wilcoxon post hoc

Hello, I assessed reading competence with 5 different tasks (U1 - U5) three times (t1, t2, t3). This is how I proceeded so far to test for...

• Replies: 0
• Views: 851
07-06-2014, 05:37 PM
16. ### multiple imputation in SPSS - how to pool the results (Friedman test)

Good morning, I used Multiple imputation to get estimates for missings in a repeated measures design. I want to know about the sensitivity of a...

• Replies: 2
• Views: 3,964
07-02-2014, 05:54 AM
17. ### Nominal covariate in RM ANOVA

Hi there, I'm running a mixed ANOVA with repeated measures; with condition (control, intervention) and time (pre-test, post-test) as...

• Replies: 0
• Views: 845
07-02-2014, 05:07 AM
18. ### Correlations in one group

Hi, 1. purpose of the study / research question / hypotheses - I'm conducting a study about Physical Courage among veterans (that is why people...

• Replies: 3
• Views: 1,036
07-02-2014, 01:59 AM
19. ### beginning of r

Good morning to all, I need a step by step explaination of how to enter the data in r. I realized only that I have to create a world file where I...

• Replies: 0
• Views: 725
07-01-2014, 02:13 PM
20. ### meta-analysis with different IV and DV?

Hi all, I'm trying to help a colleague of mine with figuring out whether a meta-analysis might make sense. I don't know much about meta-analysis,...

• Replies: 0
• Views: 1,952
07-01-2014, 10:23 AM
21. ### comparing and accounting for temperature difference between two locations

Hi, I'm a student currently undertaking my dissertation. The aim of my research is to try to gain an understanding of what informs people's...

• Replies: 0
• Views: 618
07-01-2014, 10:00 AM
22. ### Why do means&error bars in an ANOVA graph depend on its factors and covariates?

Hi all, I have a mixed-model design with between-subjects factors Group (treatment, control) and Difficulty (easy, hard), and within-subjects...

• Replies: 0
• Views: 701
06-29-2014, 12:47 PM
23. ### Need help with missing values

Participants completed 2 questionnaires at Time 1, and each questionnaire is being scored for empathy. Because of recording issues, I do not have an...

• Replies: 0
• Views: 715
06-29-2014, 12:08 PM
24. ### Scores derived from variance specific for a factor

Hi, I received a cooment from one of the reviewer but I do not understand what I should do. Here is short explanation of the study: This study...

• Replies: 5
• Views: 1,278
06-29-2014, 06:29 AM
25. ### Mediation analysis (Baron and Kenny)

Hey, I have some problems concerning the analysis of a mediation model. If you guys could give me some tips that would be great! :) First of...

• Replies: 2
• Views: 1,770
06-28-2014, 01:21 PM
26. ### Testing interaction between measures which are in different units

Hi, I have within-subject design (each subject came twice). One of the visits contained manipulation and another was a placebo. For each...

• Replies: 0
• Views: 700
06-28-2014, 06:02 AM
27. ### I am terrible at statistics and need help regarding which analysis to choose

Hi everyone, As my title states; statistics have always been very difficult for me. My teacher asked me to think about what analyses she could...

• Replies: 5
• Views: 1,174
06-27-2014, 11:38 AM
28. ### Comparing exp and control groups in a mixed design with a comparatively small N

My study investigates the type of dialogue and behavior between children working in groups on a class activity, with and without an intervention. It...

• Replies: 0
• Views: 866
rsm
06-26-2014, 01:29 AM
29. ### Queries regarding ANCOVA and MANCOVA

In a pre-post test experimental study having 3x2 factorial design, there are: 1. two independent variables: (a) teaching methods (3...

• Replies: 42
• Views: 10,486
06-24-2014, 11:13 AM
30. ### interpreting multi-level logit model

Hi, I have this output from Stata (an explanation of the variables follows). As far as I understand, the policyfoundation coefficient is...

• Replies: 0
• Views: 1,077
06-24-2014, 09:32 AM
31. ### paired sample t-test for repeated measures in 1 subject

I am conducting a psychology experiment. In my pilot study I analyze responses of one subject which ran through two conditions. The task is to...

• Replies: 9
• Views: 1,558
06-23-2014, 05:51 AM
32. ### Low Cronbachs alpha when using a standardised measure- how do I explain this?

Hi, for my thesis I conducted cronbachs alpha on several measures- the core questionnaire is the Five Facet Mindfulness Questionnaire (FFMQ). My...

• Replies: 3
• Views: 989
06-22-2014, 01:38 PM
33. ### How to analyze a variable measured on a Likert scale and its interaction with another

I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "likert scale" measures "brand commitment" if thats...

• Replies: 1
• Views: 746
06-17-2014, 08:20 AM
34. ### SEM - total variance explained by model?

Question #1: Is there any way to calculate the total amount of variance explained by an SEM model? My committee seems to think there is and they...

• Replies: 12
• Views: 6,713
06-17-2014, 01:50 AM
35. ### Violating ANCOVA "Homogeneity of Regression of Slopes"

Hi all, I am working on a publication where I ran a 3-way mixed design ANCOVA. For one of my between-subjects IVs (gender) I found a significant...

• Replies: 0
• Views: 1,790
06-16-2014, 06:29 PM
36. ### Interrater Reliability. Is MORE better?

Which design is more powerful: testing interrater reliability with 2 judges or 4 judges? (citations appreciated)

• Replies: 3
• Views: 1,007
06-16-2014, 01:37 PM
37. ### Interaction effect not significant, but graph indicates otherwise...

For my thesis I had two hypotheses regarding moderator/interaction effects: h1: Exisiting game experience (dependent, continous) moderates the...

• Replies: 8
• Views: 1,512
06-15-2014, 01:44 AM
38. ### Principal component analysis - problems with input data

Hello everyone. As the title suggests, I have a problem with figuring out what data exactly to feed my PCA. The situation: I have a certain number...

• Replies: 0
• Views: 780
06-14-2014, 04:40 PM
39. ### Analysis question

My analysis is a 2 X 2 , looking at the influence of gender (male, female) & SES (middle class, poor) of a job candidate on how he is evaluated for a...

• Replies: 0
• Views: 673
06-14-2014, 02:27 PM
40. ### Determining the right statistical test

• Replies: 0
• Views: 871
06-12-2014, 12:10 PM
41. ### Experiment design

Hi I am designing an experiment for school and I don't know how best to describe the factorial design. I have three conditions, and I will be...

• Replies: 3
• Views: 907
06-12-2014, 10:16 AM
42. ### statistical symbols in microsoft word

I've spent like 5 hours trying to figure out how to insert a bar (called overstrike or overline) over a word ... like the bar that goes over x for...

• Replies: 5
• Views: 2,706
06-09-2014, 11:33 PM
43. ### How to analyse..?

Hi, I have a problem to choose a method for analysing data from my experiment. I have one within-subjects (all four stimuli presented to every...

• Replies: 0
• Views: 837
06-06-2014, 07:03 PM
44. ### Preacher&Hayes Process macro

Hello friends! We are interested in the relationship of x on y, mediated by m. All variables are dichotomous except for x, which is continuous....

• Replies: 1
• Views: 1,892
06-06-2014, 04:10 PM
45. ### Could really use some advice for my thesis!

So I'm almost done with my thesis but I'm struggling with my last hypothesis. Some background information on my subject: I'm trying to find out what...

• Replies: 3
• Views: 1,120
06-06-2014, 06:26 AM
46. ### Nonparametric/Ranking Data Help!!

Hi all, I am a PHD student attempting to come to grips with an analysis of some recent data. I have a repeated measures design. 220 students were...

• Replies: 0
• Views: 683
06-03-2014, 08:22 PM
47. ### Sample size calculation for multiple regression

Hi all! I am struggling with sample size calculations at the minute. I have looked everywhere but all I get is formulas. I have downloaded MedCalc...

• Replies: 0
• Views: 1,206
06-03-2014, 04:58 PM
48. ### Autism behaviour - how to analyse data

I'd like help how to use data on the behaviour of an autistic individual. In my work I'm taking care of an adult male with autism. He's in his...

• Replies: 2
• Views: 904
06-03-2014, 03:46 PM
49. ### Question: What type of experimental design do I have here?

I feel a bit unsure and maybe you can help me. I've got the data of a big firm, where there is a population of 1400 administrative personnel...

• Replies: 5
• Views: 1,177
06-03-2014, 11:15 AM
50. ### How to analyze parents' talk when codes are not normal in a mixed design?

This is a but tricky to explain, so I will do my best. I am trying to analyze coded talk by parents for three different categories of objects. I...

• Replies: 1
• Views: 802
06-03-2014, 03:06 AM
51. ### HELP with experimental analysis (fear conditioning)

I am running an olfactory fear conditioning procedure in which 2 odors (odor A/ odor B) are either paired with a footshock (CS+) or absence of...

• Replies: 1
• Views: 717
06-02-2014, 07:02 AM
52. ### Not sure if i chose the correct statistical test to analyze data

I'm trying to help a friend out with the statistics parts of her bachelors paper. Right now she is still the the planing stages and has not gathered...

• Replies: 0
• Views: 524
05-30-2014, 07:06 AM
53. ### Condensed data vs. raw data. What analyses would be appropriate?

Hello all, I am new to this forum and would greatly appreciate your help. I have two datasets: one dataset is from 1980 and only “processed”...

• Replies: 1
• Views: 805
05-29-2014, 01:48 PM
54. ### HELP understanding results and writing discusion

can somebody help me !! I am going crazy haha The third hypothesis predicted that people in a happy mood were more likely to process information...

• Replies: 0
• Views: 597
05-29-2014, 12:57 AM
55. ### Cross-lagged panel size: sample size of 48

I have performed a cross-lagged correlational study with 2 variables and 2 waves. My sample size is 48 subjects. Is it possible to perform it with...

• Replies: 0
• Views: 753
Chr
05-28-2014, 12:34 AM

Hello! I've looked all over regarding how to do this but am still coming up short. Please help! I have 16 data points. I have provided the weights!!...

• Replies: 0
• Views: 601
05-26-2014, 05:00 PM
57. ### What correlations to use for ANCOVA assumptions in a 2-group study?

Hi all, I have a question regarding ANCOVA analyses. For my study, I am looking at between group differences on a memory measure that is made...

• Replies: 0
• Views: 552
05-26-2014, 04:52 PM
58. ### Assessing change using McNemar's test

I have Pre and post-intervention test scores of a number of skills rated from 0-3 (0 = Poor, 1 = Fair, 2 = Average, 3 = Good) for 5 participants. I...

• Replies: 4
• Views: 834
05-24-2014, 04:41 PM

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