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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: 31,424
11-10-2005, 12:21 AM
1. ### Comparing differences between groups over time with nominal variables

Hi all, I'd like to compare differences between groups over time, but I only have a nominal variable to work with ('yes', 'no', 'unsure'). It's a 2 x...

• Replies: 0
• Views: 1,614
01-17-2014, 01:45 AM
2. ### Do I need to worry about normality, if the DV is a 1-item 10point likert scale ?

Dear all, I hope you can help me with the following question My design was a 2 x 2 with a single item measuring responsibility on a 10 point...

• Replies: 3
• Views: 1,992
01-14-2014, 01:17 PM
3. ### What Is F in Univariate Anova Report?

Hi, can someone tell me where/what is F(_,_) when reporting a univariate anova result? where do i get this from?

• Replies: 7
• Views: 2,746
01-14-2014, 10:53 AM
4. ### Statistical significance of age difference between male and female subjects

"The ages of the male group were 20.5±1.2 and the ages of the females 19.2±2.3. The difference in mean age between the groups is not...

• Replies: 4
• Views: 2,685
01-13-2014, 04:35 PM
5. ### what (depedent) variable to use when checking normality test

Hi there, I'm testing whether there is a difference in binge drinkers or Non-binge drinkers verbal declarative memory and processing speed. I...

• Replies: 3
• Views: 2,134
01-12-2014, 07:51 AM
6. ### Please advise me on the best kind of regression for ordinal data which was factored

I started with a large number of Likert-type questions containing 5-point attitude scores. I then ran these questions through principal component...

• Replies: 0
• Views: 1,864
01-11-2014, 03:39 PM
7. ### Which test should I use?

Hi all! I'm studying the expression of C-Fos (a stress hormone) in mice brains. Basically, I'm analysing one specific area of the brain and I...

• Replies: 2
• Views: 1,269
01-11-2014, 03:30 PM
8. ### Need help choosing statistical test

Hey, I am conducting a study for my dissertation and I would like to know whether binge drinkers scored worse than non-binge drinkers on 3...

• Replies: 1
• Views: 1,494
01-10-2014, 05:03 PM
9. ### Exploratory Study -- ordinal data questions

Hello all, I’m a first time poster but have gained much insight reading through past threads. I’m running an exploratory study, containing a few...

• Replies: 3
• Views: 2,094
01-10-2014, 12:22 PM
10. ### Scale conversion based on previous research

Hello, I am using an agent-based model to simulate emotional contagion in teams. I have an article that has determined the "shift" of within person...

• Replies: 0
• Views: 2,026
01-09-2014, 05:48 PM
11. ### Methods for verifying intependent variable integrity. How?

Can you help me by describing a few methods for verifying independent variable integrity in single subject experiments? Thank you! :)

• Replies: 0
• Views: 1,390
01-09-2014, 01:06 PM
12. ### What statistic to use? Weighting of word frequencies in psychology research study...

Hi there, I am a psychology researcher and new to this forum. I am currently trying to figure out if there is an appropriate statistical test that I...

• Replies: 5
• Views: 2,224
01-09-2014, 09:13 AM
13. ### Analyzing data based on groups, but how to create this groups

Hello, We are conducting a study about resilience in adolescents. Our data is based on self-report questionnaires. We've got 2 independent...

• Replies: 1
• Views: 1,476
01-08-2014, 07:19 AM
14. ### Types of ANOVA

Hi, I'm really sorry to ask what's probably a silly question, but I have a hypothetical scenario and I'm not sure what type of ANOVA test would be...

• Replies: 0
• Views: 1,064
01-07-2014, 11:31 AM
15. ### Testing if Rank Data varies significantly from 0

Hi, I've done a survey with an 11 point Likert scale (-5 to +5, with 0).There are 30 questions total in the survey, with ~800 responses. I have...

• Replies: 1
• Views: 1,268
01-01-2014, 08:48 PM
16. ### Factor analysis with different groups

Hello, I was hoping somebody might be able to help with my question about factor analysis. If I am looking to create factor scores for three...

• Replies: 0
• Views: 2,026
12-23-2013, 09:17 AM
17. ### Correcting for ties in Kruskal-Wallis

Hi, I'm new to this forum so I hope I've posted this in the right place! I was just wondering if anybody could clarify something with with...

• Replies: 5
• Views: 6,806
12-22-2013, 08:45 AM
18. ### Correlating factor scores and calculating marker scale scores

Hi, I am doing a lexical study, identifying personality factor structure of the Malay language adjectives. I have three datasets: 1) The Malay...

• Replies: 0
• Views: 1,530
12-18-2013, 11:36 PM
19. ### Analysis of Variance for Nominal Data

Hi there, I would like to ask if there is statistical test named Maximum Likelihood Analysis of Variance (for nominal data). I have viewed it on one...

• Replies: 2
• Views: 1,784
12-17-2013, 02:55 PM
20. ### Interrater Agreement using intraclass correlation coefficient

Hello, has some one used ICC to test the interrater agreement? Here is my problem. I've two groups of subjects. One group (n=30) has watched an...

• Replies: 1
• Views: 1,863
12-17-2013, 02:38 PM
21. ### How to analyse my research question...

Hi all, I am wondering what would be the best way to analyse my research question. I am looking into whether childhood experience (child abuse...

• Replies: 7
• Views: 1,181
12-17-2013, 01:00 PM
22. ### Calculating confidence intervals of the average deviation from the mean

Hello. Sorry for my horrible english. As part of my masters thesis, I have analysed a large ammount of text from COP19, and coded the text. As a...

• Replies: 0
• Views: 1,244
12-16-2013, 05:32 AM
23. ### To report or not to report posthocs for a 'back up' test

Short version - I have run some non-parametric tests (Friedman) as sort of backup to a ANOVA because of an assumption violation - should I report the...

• Replies: 4
• Views: 1,959
12-15-2013, 12:19 AM
24. ### what test to use?

Dr. Bradshaw, a dean at a university wonders whether performance by students in her school has fallen this semester. Students in the school of...

• Replies: 1
• Views: 1,311
12-12-2013, 04:02 AM
25. ### tricky question.. within session measures.

I have one person stationary cycling for 20 minutes, with a target rotation time. Now, i have taken two samples from this data, one consisting of...

• Replies: 0
• Views: 1,001
12-11-2013, 05:20 AM
26. ### Best analysis for intervention study & how to analyse mediating variables

I need help to determine the best statistical analysis to run for a pre-test post-test intervention study. This is a 2 part question. I have...

• Replies: 0
• Views: 2,208
12-09-2013, 01:28 AM
27. ### Do I Use ANCOVA or Direct Difference

Hi, I have pre- and post- test data from both a test and control group and want to see whether the test group improved more than the control group....

• Replies: 7
• Views: 1,723
12-07-2013, 11:06 AM
28. ### Single group + musical training + score

Hello my friends! Hope its all good with you. So, here I am, maybe like any other psycholody student who struggle with statistic anylisis in his...

• Replies: 4
• Views: 1,832
12-05-2013, 10:53 AM
29. ### Factorial ANOVA

I am working on a 2x2 ANOVA about the effect of gender and major on grad school interest. I have found that there is a significant statistical...

• Replies: 0
• Views: 1,777
12-04-2013, 10:50 PM
30. ### Do I need to transform my data?

I conducted an experiment in which 25 participants had to determine whether a dot has changed its original position after being interfered with some...

• Replies: 1
• Views: 1,276
12-04-2013, 08:14 AM
31. ### Moderated Multiple regression help? Basic understanding

I am doing an honors thesis that involves a moderator. I need a basic understanding of moderated multiple regression for my methods section. I have...

• Replies: 1
• Views: 1,177
12-04-2013, 03:06 AM
32. ### Am I doing the right thing???

Hi, Could someone confirm if I have used the right tests please.... Im testing if staff training impacts on attitude to patients using a...

• Replies: 0
• Views: 978
12-03-2013, 12:38 PM
33. ### Normality tests and Shape statistics contradictory

Hello. I am testing for normality on a number of repeated measures variables in a sample of 29 people. Both the Kolmogorov-Smirnov test and the...

• Replies: 0
• Views: 810
11-28-2013, 07:10 AM
34. ### Choosing an appropriate test?

Hi guys, So I'm preparing a research proposal in the attempt to answer this research question: To investigate whether direct contact between an...

• Replies: 0
• Views: 1,010
11-28-2013, 05:04 AM
35. ### Experimental design - what to call ours?

Hi, I have a question regarding the design of our experiment and what to call it. Me and three other students are performing an experiment for our...

• Replies: 0
• Views: 1,335
11-27-2013, 07:30 AM
36. ### within subjects analysis assistance

I came in to a lesson as a trainee teacher and was informed the students were doing a research project and needed assistance with the analysis. The...

• Replies: 1
• Views: 1,125
11-26-2013, 08:15 AM
37. ### Difficult design, how to analyze ?

Hello all, I have a hard design which I don't know how to analyze. I have 20 subjects. Each was asked a question in 3 different ways. The...

• Replies: 1
• Views: 1,272
11-24-2013, 05:32 PM
38. ### (Uni)dimensionality issue - consultation

Hi, I would need to support the unidimensionality assumption for IRT. I have about 25 dichotomous items in test. To do that... I did... 1) PCA...

• Replies: 2
• Views: 1,327
11-22-2013, 10:59 AM
39. ### Nonequivalent-group pretest posttest design. Is this valid?

Dear Statisticians, I find myself in a rather difficult setup for a field experiment. I need to measure if a regional Facebook advert as...

• Replies: 0
• Views: 2,647
11-22-2013, 03:31 AM
40. ### [help, urgent] multiple imputation split on group variable

hi! In my design, I have predicor variables which are assessed for all participants. The experimental manipulation occurs before the assessment of...

• Replies: 0
• Views: 1,937
11-21-2013, 04:22 PM
41. ### Independent samples T test

Hi, I'm working my way through homework, but I'm having trouble reporting the results of this one study. Peg word mnemonic Method of Loci...

• Replies: 0
• Views: 1,223
11-21-2013, 07:08 AM
42. ### Correlation between paired samples and an independent variable?

Hi everybody! This is from a study in medicine trying to find whether good consultation can improve patients well-being. In the study patients...

• Replies: 3
• Views: 1,557
11-20-2013, 04:40 PM
43. ### Interpreting very high and very low KMO/adequacy values. Dimensionality?

Hello there first of all! Glad to be on an active stats forum. Background: short-term cohort study with several test dates. One of the focuses was...

• Replies: 0
• Views: 1,877
11-20-2013, 10:50 AM
44. ### Best test?

Hi, I wonder if anyone can help me. I'm trying to work out the best statistical test to use with my data. I'm trying to investigate prevalence of...

• Replies: 5
• Views: 1,332
11-20-2013, 08:22 AM
45. ### sample effect size vs true effect size

Is it true that sample effect size is probably lower than the true effect size? If yes, Why?

• Replies: 2
• Views: 1,257
11-20-2013, 04:01 AM
46. ### Lower effect size and power analysis

I've a question regarding this problem A person is running a power analysis to determine the sample size for an upcoming study. He takes α = .05...

• Replies: 1
• Views: 1,226
11-19-2013, 08:55 AM
47. ### Between-participants experiments

Hi, this is one of my assignment question. I would really appreciate it if someone could point me in the right direction, I'm new to statistics and...

• Replies: 1
• Views: 986
11-18-2013, 01:23 PM
48. ### Propensity score matching

Does anyone of any guidelines for choosing a caliper for propensity score matching? I am doing a graduate course project where we have to use radius...

• Replies: 0
• Views: 1,555
11-18-2013, 10:38 AM
49. ### which test is appropriate to find 'link'?

Hi I don't know how to solve an assignment. I have been staring at it for hours. Am not sure if I need to find correlation or if I should demonstrate...

• Replies: 14
• Views: 4,288
11-18-2013, 08:43 AM
50. ### appropriate statistical analysis with experience sampling design

In an experience sampling exploratory study we asked participants to report on a set of continuous variables (IVs= x1, x2, x3, x4, x5 , DV=y) 5...

• Replies: 0
• Views: 2,142
11-16-2013, 04:10 PM
51. ### Complex Randomisation in Clinical Trials

I am running a clinical trail. At the end I will have 45 people in a control group and 70 with T1 & T2 treatment data. I want to use a post hoc...

• Replies: 0
• Views: 1,142
11-15-2013, 08:08 AM
52. ### Lower Power

Why is designing a study with low power problematic? Please answer briefly.

• Replies: 3
• Views: 1,571
11-14-2013, 04:38 PM
53. ### simple effects analysis

Hello, My apologies if this topic should not be here. I have a within participant design with two variables: view and task. I obtain an interaction...

• Replies: 0
• Views: 1,073
11-13-2013, 11:09 AM

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