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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: 32,184
11-10-2005, 12:21 AM
1. ### Wilcoxon test

I encountered the following stats in a results section: Wilcoxon test: z = 2.48, tied p < .007. What does "tied" mean?

• Replies: 8
• Views: 1,959
08-08-2013, 11:08 AM
2. ### Interaction and negative binomial regression analysis for criminological thesis

Hello, For my master's thesis I'm conducting a research on the influence of morality and self-control on self-reported delinquency. Morality is a...

• Replies: 6
• Views: 5,026
08-07-2013, 06:59 AM
3. ### Likert scale - categories

Hello there, For my doctoral thesis, I am analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are...

• Replies: 0
• Views: 2,354
08-07-2013, 03:48 AM
4. ### Not sure how to present data - 3D scatter?

To help aid the reader of my thesis I want to present some perceptual data in a graph or table format, but am unsure what approach to use as I want...

• Replies: 4
• Views: 1,837
08-06-2013, 07:10 AM
5. ### Computing the reliability of a single item scale

I am using a single item measure of self-esteem for my study and have computing the scale reliabilities of my other measures using cronbach's alpha....

• Replies: 2
• Views: 3,812
08-06-2013, 07:04 AM
6. ### Quick question: When reporting on Cronbach's Alpha..

Do you round up? So if using 2 decimal places, would .885 be rounded up to .89, or do you report it as .88? Many thanks! Lolly

• Replies: 6
• Views: 9,356
08-05-2013, 04:51 PM
7. ### Literature review: comparing prevalences calculated from existing data. Chi-squared?

I am currently conducting a systematic review of the literature on the prevalence and topography of challenging behaviours (such as self-injury and...

• Replies: 0
• Views: 1,648
08-05-2013, 10:56 AM
8. ### Stuck on MANOVAs: How do I run a MIXED MANOVA in SPSS?

I have been searching everywhere online and I really can't find the answer! No uni lecture notes, youtube tutorials, nothing. I need to conduct a...

• Replies: 3
• Views: 8,570
08-05-2013, 03:02 AM
9. ### Data not normally distributed-what to do?

`Hey guys, I'm hoping someone can give me some advice on this. I collected data for 4 continuous DVs from 408 people. I want to do ANCOVAs and so...

• Replies: 5
• Views: 4,342
08-02-2013, 10:32 AM
10. ### Imputation at the item level vs scale level

Hello all. I wonder if someone could help me to clarify a doubt. It is usually said that it is always better (if possible) to impute at the...

• Replies: 3
• Views: 2,560
08-02-2013, 05:08 AM
11. ### Which statistical test to use

Hi everyone, I'm a little bit confused as to what kind of analysis to do, and would really appreciate some advice from people more statistically...

• Replies: 10
• Views: 2,029
07-31-2013, 07:20 AM
12. ### Optimal clustering

I have demographic data which includes birth dates and some binary variables for each of several hundred people sampled. An example for a binary...

• Replies: 0
• Views: 1,438
07-30-2013, 06:02 AM
13. ### Statistically Challenged Psychology student!!!

Hi everyone, I am really hoping that someone here can help me out. I am really struggling with the analysis for a Psychology study I have conducted,...

• Replies: 1
• Views: 1,953
07-29-2013, 06:37 PM
14. ### How to concluded surveyed data to result

I am working on a survey where I have to prove/diprove my hypothesis. I am seeking this help/guidance since I am getting hard time to related my...

• Replies: 4
• Views: 1,832
07-29-2013, 11:48 AM
15. ### Linear discriminant analysis

Hi All, Here is my problem. I ran a LDA analysis in SPSS and I go a quite high classification accuracy (72.7%) what I find odd is that the Wilk's...

• Replies: 0
• Views: 1,418
07-26-2013, 08:43 AM
16. ### ANOVA and mediation- could someone CHECK over this with me? Help gratefully received

Hi, I really hope someone could help me out. I'm having a crisis of confidence. I have a PhD in psychology but it's been a while since I did...

• Replies: 8
• Views: 7,281
07-26-2013, 05:02 AM
17. ### Obtaining the standard error?

I'm trying to calculate the standard error for some data I have collected for my dissertation. It is a factorial design with a within subjects...

• Replies: 2
• Views: 1,521
07-24-2013, 05:45 AM
18. ### What analysis should I run?

Hi, I am not sure which analysis to run based on what I am trying to figure out, any guidance is appreciated. The research question is- are...

• Replies: 6
• Views: 1,712
07-22-2013, 05:42 PM
19. ### Meaning of "n" when analyzing data

Hi all, I am a bit confused with "n" in the context of data analysis. Is "n" (1) the number of participants OR (2) the number of observations? ...

• Replies: 4
• Views: 2,008
07-20-2013, 05:43 AM
20. ### Survey Design.

I have a question about survey design. I'm fairly new to it and am looking to see if such a technique is valid. I am hosting a conference with ~20...

• Replies: 6
• Views: 1,424
07-19-2013, 05:46 PM
21. ### Repeated measures MANOVA follow-up

Greetings everyone. I am new to the forum, so I hope I picked the right section for this thread. Apologies if that's not the case. As you can see...

• Replies: 1
• Views: 1,841
07-19-2013, 06:09 AM
22. ### What is formula for calculating Simple Contrasts test for within-groups ANOVA?

I need to be able to calculate long hand some Planned Comparison test for a Within-Groups ANOVA framework. I understand the most common tests in such...

• Replies: 3
• Views: 3,042
07-18-2013, 09:37 PM
23. ### SPSS: Handling Multiple Responses

Hi Everyone, I have a survey question where participants can select more than one option (e.g. if they have a mood disorder, and an anxiety...

• Replies: 1
• Views: 2,527
07-18-2013, 04:56 PM
24. ### Which ICC to choose if there are missing values?

I want to say that I am really sorry if this question has already came up but after looking in different posts I could not find good answer. I...

• Replies: 1
• Views: 4,064
07-18-2013, 04:46 PM
25. ### Survey data analysis - question about sampling weights

I am analyzing some survey data, and I am confused about how best to weight it. The survey was placed on the internet, and respondents from different...

• Replies: 1
• Views: 1,419
07-18-2013, 04:37 PM
26. ### Multinomial Logistic Regression

Hi everyone, I was wondering if I would be able to use Multinomial Logistic Regression in my study. I want to see whether scores on tests of...

• Replies: 3
• Views: 2,692
07-18-2013, 04:09 PM
27. ### MANCOVA help!

Hello, Can anybody help me out? I have had my head in books for ages now and I feel like I am going a little mad! They are either too basic or too...

• Replies: 2
• Views: 2,277
07-18-2013, 05:09 AM
28. ### Is it possible to compare (with ANOVA) results from cross-correlations data?

Hello, I’d appreciate any thoughts or direction to resources for this dilemma. I like to think myself pretty reasonable at statistics, however I'm...

• Replies: 3
• Views: 2,881
07-16-2013, 03:25 PM
29. ### Comparing correlation coefficients from the same sample

Can anyone tell me how I can do this using SPSS? So I have self-criticism - self-compassion correlation and brooding-self-compassion correlation and...

• Replies: 6
• Views: 6,377
07-12-2013, 07:07 AM
30. ### 3*3 Mixed ANOVA - non parametric test to use??

Quite simple really. The dependent variable procures ordinal data - I have 2 related factors and 1 unrelated factor. No idea what NP test is...

• Replies: 0
• Views: 1,748
07-12-2013, 05:24 AM
31. ### SPSS: Comparing my data with data from other studies

Hi Everyone, I'm working with a likert scale measure which I've scored up for participants in my own study. There are two other studies who also...

• Replies: 6
• Views: 3,740
07-11-2013, 10:37 AM
32. ### Power analysis and correlations (effect sizes)

Hi everyone! I’m conducting a power analysis to determine the minimum sample size I will need to detect an effect size of 0.3 (i.e., a...

• Replies: 1
• Views: 1,633
07-10-2013, 09:46 AM
33. ### Psychometrics characteristics - AVE measure

Dear all, I measure validity and reliability of my questionnaire that presents feedback of users who used our system. I have problem how to...

• Replies: 0
• Views: 1,993
07-10-2013, 08:48 AM
34. ### Most appropriate statistical test for this nested design

I currently am conducting a study where I have three variables: one that is binary, and two numerical variables as measured on a ratio scale. Each of...

• Replies: 3
• Views: 1,767
07-08-2013, 11:37 PM
35. ### Big Five Personality Experiment...ANOVA/MANOVA or something else?

Hi everyone! I've been given a data set to analyse but I'm a little unsure of which statistic to use. I'm looking at whether there are any...

• Replies: 6
• Views: 2,121
07-08-2013, 11:43 AM
36. ### Interpreting a significant manipulation which the scale for doesn't predict DV

Hello, I have a stats conundrum I have an MSc thesis in which two groups were manipulated to either include others in their group, or manipulated...

• Replies: 0
• Views: 900
07-08-2013, 12:14 AM
37. ### CFA - number of indicators

The measure I am using has only two (parcel) indicators per factor. I know this is not ideal for CFA, but my question is - Is there anything extra I...

• Replies: 1
• Views: 1,561
07-07-2013, 08:14 PM
38. ### Statistical test for analyzing 2*3 between-subject design's main & interaction effect

Hello, I am now having trouble analyzing my data since I got stuck on selecting the proper statistical test to use. My data is a 2*3...

• Replies: 3
• Views: 2,254
07-05-2013, 02:36 PM
39. ### Calculating Item Discrimination Index for a Likert Questionnaire

I am currently in the early stages of developing a scale that measures prejudicial attitudes. I have just run a pilot study with the first draft of...

• Replies: 0
• Views: 5,133
07-04-2013, 11:48 PM
40. ### Calculate effect size from regression estimates for meta-analysis

Hi, I really hope someone can help me, I'm a bit stuck.. I'm running a meta-analysis looking at childhood predictors of personality disorders, so...

• Replies: 3
• Views: 4,470
07-02-2013, 01:33 AM
41. ### Should I use an ANCOVA?

Hi Everyone, I'm working with two scales (one measuring therapeutic alliance and one measuring client satisfaction). While scores on these two...

• Replies: 3
• Views: 2,601
07-01-2013, 02:12 PM

Hello everyone, I need some expert advise for the following stats question. I am evaluating data for a psychological learning experiment with a...

• Replies: 0
• Views: 1,152
06-27-2013, 10:21 AM
43. ### Research Issue: Multi item scale/Confirmatory factor analysis

We conducted a study on information elaboration in teams. After data sampling our supervisor instructed us to also examine the dependent variable...

• Replies: 2
• Views: 1,427
06-26-2013, 11:31 PM
44. ### question about degrees of freedom in ANOVA

Hello, Just figuring out statistics on my own after doing a psycholinguistics study for my undergrad thesis (never taken a statistics class). ...

• Replies: 0
• Views: 2,146
06-24-2013, 09:33 PM
45. ### How do you report Fisher's Least Significant Differences results?

Hi, I've been looking online to see how to report LSD results but I cannot find anything anywhere! :( I understand for a lot of post hoc/planned...

• Replies: 1
• Views: 6,544
06-24-2013, 04:41 PM

I'm helping a colleague of mine with his homework for his political science master. He's investigating the effect of political orientation on support...

• Replies: 12
• Views: 4,245
06-21-2013, 10:35 AM
47. ### Calculating Z-scores for d' (SDT sensitivity)

Hello, I have a database which contains three distinct groups. My goal is to compare these groups based on the d' sensitivity index which comes...

• Replies: 0
• Views: 3,594
06-20-2013, 11:25 AM
48. ### multilevel growth model--should I include random slopes?

Hi all, I am trying to determine whether I should include random slopes at level 2 of my growth model. I suspect we are right on the borderline...

• Replies: 3
• Views: 1,717
06-19-2013, 03:11 PM
49. ### PhD - which statistical analysis to use? MLM, t tests, ANOVA?

Hi, my research question is "do large cognitive changes precede a period of mood stability?" (N = 30), I have 20 therapy sessions data for each...

• Replies: 1
• Views: 1,274
06-19-2013, 08:08 AM
50. ### Reduce already explained variance?

Hello there, I am new to this forum and am very excited about it. Everyone here appears to be genuinely nice and talks about statistics. :) I...

• Replies: 1
• Views: 1,141
06-19-2013, 01:16 AM
51. ### Beauty Pageant Method of Analysis

So, I was watching a beauty pageant last night (Miss USA) and I thought about stats. (I know, what's wrong with me?) What kind of analysis method...

• Replies: 3
• Views: 3,427
06-18-2013, 06:18 PM
52. ### Which test for this Music Perception data?

Hi Everyone, I'm analysing to what extent a piece of music must be out of tune before people realise that it is so. Subjects were played one of...

• Replies: 2
• Views: 1,648
06-18-2013, 01:52 PM
53. ### Bivariate Normal

Suppose there are two ability tests, on which scores are normally distributed and correlated .7 with one another. Suppose that there's a criterion...

• Replies: 2
• Views: 1,771
06-17-2013, 05:40 PM

I'm working on an assignment for my university stats course, and one of my questions presents me with a data set and asks me, of the continuous and...

• Replies: 1
• Views: 1,336
06-17-2013, 09:58 AM
55. ### How Do I Create a line graph for a three-way interaction with a continuous variable?

I ran a 2 (Time 1, Time 2) X 2 (Prime Type: Secure, Neutral), X (Prime Technique: Implicit, Explicit) X Covariate (Anxiety) Mixed-Subjects ANOVA...

• Replies: 1
• Views: 7,665
06-13-2013, 09:35 PM
56. ### Help choosing a method of analyzing data.

Ok so I need help trying to analyze my data. This isn't my experiment but it involves a similar situation which I'm using as an example. So lets...

• Replies: 1
• Views: 1,625
06-09-2013, 07:18 AM

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