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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: 31,369
11-10-2005, 12:21 AM
1. ### Negative combach's alfa in evidence based questionnaire

Hey everyone, For a small research I had to do I used the Rosenberg Self-esteem scale and tried to look for correlations with aggression using the...

• Replies: 8
• Views: 3,173
05-29-2013, 11:07 AM
2. ### Variance of combined normally distributed scores

I'm trying to compute a average score of several normally distributed weighted variables. To make myself easy, I'm using z-scores. The weights are X1...

• Replies: 1
• Views: 3,445
05-28-2013, 05:36 PM

Hey Guys I kind of need help with these questions would really appreciate it 1.)When the assumption of sphericity is violated, correction...

• Replies: 1
• Views: 1,321
05-28-2013, 02:35 AM
4. ### Mixed models, Repeated Measures, multiple DVs, SPSS- help!

Hi there, My data is approximately as follows: 400 participants split over 2 interventions. The participants are school students from 14...

• Replies: 0
• Views: 2,353
05-27-2013, 05:42 AM
5. ### Within-subject comparison

I randomly exposed subjects (students) to one of two experimental conditions before each of four exams, with their exam performance as the dependent...

• Replies: 0
• Views: 2,187
05-25-2013, 06:35 AM
6. ### Can I use a two way repeated measures ANOVA?

Hi, I'm doing an acoustic experiment where I have the same 10 subjects listening to/undergoing 18 different conditions. I have 3 independent...

• Replies: 0
• Views: 1,180
05-24-2013, 01:39 PM
7. ### omega squared as effect size measure in repeated measure ANCOVA

Hi, I would like to report the effects size for a repeated measure ANCOVA. Instead of the eta squared it seems that the omega squared is more...

• Replies: 0
• Views: 2,389
05-24-2013, 05:19 AM
8. ### Main effects in factorial ANOVA

Hello helpful people, I'm doing my comps exam and I have an issue determining what constitutes a main effect in my design. I will conduct a 3x3...

• Replies: 1
• Views: 1,950
05-23-2013, 07:31 AM
9. ### Paired-sample or Independent T-test?

Hi, I have read all of the examples available but I can't tell which test to use because none of the examples use the kind data that I do! Please...

• Replies: 1
• Views: 1,988
05-22-2013, 06:34 AM
10. ### Performing Pearson Correlation On Multiple (more than 2) Variables

Greetings all, I am struggling with finding out the Pearson's coefficient when there are more than 2 variables, and would welcome any assistance...

• Replies: 8
• Views: 65,110
05-22-2013, 05:09 AM
11. ### Help in categorizing data

Hi, I am working on my dissertation and am stuck with the data analysis. :confused: I am dealing with 4 variables, all of which are categorical...

• Replies: 1
• Views: 2,187
05-21-2013, 11:26 PM
12. ### Using PCA Components in K-Means Cluster

I put this here because I didn't think this was necessarily an SPSS specific question, forgive me if I chose the wrong forum. I had a very large...

• Replies: 1
• Views: 1,741
05-21-2013, 11:21 PM
13. ### Repeated measures ANOVA or multilevel modeling

Hi everyone, I have collected questionnaire data from a group of 20 trainees and their 20 supervisors on a construct called professionalism (25...

• Replies: 4
• Views: 2,617
05-21-2013, 04:15 PM
14. ### Structured equational modelling in multimediational analysis

Hi Everybody I am currently writing up my results regarding mediators between insecure attachment and depression. I have used Andrew Hayes...

• Replies: 0
• Views: 821
05-21-2013, 12:37 PM
15. ### Does it matter whether the same construct is measured differently for different pp's?

Hi all, I am doing a multiple regresssion analysis with several temperament scales, birth order (firstborn(age =4) or secondborn(age=2) and...

• Replies: 0
• Views: 1,002
05-21-2013, 08:16 AM
16. ### Is it ok to run some planned comparisons and some post hoc?

Hello - I am a phd student in psychology and I would be very grateful for some advice about contrasts. I have conducted a naming experiment for...

• Replies: 3
• Views: 2,256
05-20-2013, 05:40 PM
17. ### Controlling for type-1 error

We have conducted an experiment that asks respondents to rate whether they thought an article was biased on an 11-point scale, with 0 being biased to...

• Replies: 1
• Views: 891
05-16-2013, 12:08 PM
18. ### Statistical methods for comparing trend lines? Need help with search terms.

Hello, I'm analyzing the results of an educational research study wherein learners had the opportunity to conduct multiple attempts (trials) at a...

• Replies: 1
• Views: 4,677
05-14-2013, 08:30 AM
19. ### Interaction in 2X2 ANOVA: How to interpret simple effects

In a 2x2 ANOVA I found a main effect for 1 IV and an interaction effect. I conducted a post hoc simple effects test by using paired sample t-tests...

• Replies: 0
• Views: 3,161
05-13-2013, 08:33 AM
20. ### DIF analyses in multidimensional IRT

Hello everyone, I am currently using IRTPro to assess the presence of DIF on a 5-dimension scale (1 general dimension, 4 subscales). It is a graded...

• Replies: 4
• Views: 2,769
05-12-2013, 12:09 AM
21. ### When group sizes are not a problem in bootstrapped ANCOVA?

Hi, I have three groups (defined by paranoid ideation level). I am running bootstrapped One Way ANCOVAs due to non-normality (expected for paranoia...

• Replies: 0
• Views: 1,171
05-11-2013, 09:51 AM
22. ### How to start on data analisys

Hey, i am new here and i would like get some advices to start on data analisys field. I study computing engineer and i work as programmer. For my...

• Replies: 6
• Views: 2,013
05-10-2013, 02:06 PM
23. ### About CFA in AMOS

I ran CFA in AMOS, which is a second order confirmatory factor analysis. When I read the result, I found that the standardised regression weights...

• Replies: 0
• Views: 2,728
05-10-2013, 02:02 AM
24. ### confusing tests for the significance of two IVs

Hey people, Im doing a report on the results of a memory recognition study. The experiment involves 178 students being shown a list of 30...

• Replies: 2
• Views: 1,285
05-08-2013, 02:59 AM
25. ### Help with SPSS and which analyses?

Hiya, since posting I've sorted it all out! Thanks for your help x

• Replies: 1
• Views: 1,267
05-07-2013, 04:49 PM
26. ### Help with statistical analyses with only small sample size and multiple DV's??

I am looking at the relationship between Schizophrenia, Substance Abuse and Neurocognition. I have 30 P's with Schizophrenia and 30...

• Replies: 2
• Views: 2,068
05-06-2013, 09:09 PM
27. ### EFA assumptions and related diagnostics

What are the critical assumptions for EFA and how do you test for them? Here are two examples of the questions I have on this. First, some warn of...

• Replies: 1
• Views: 3,543
05-06-2013, 06:33 PM
28. ### Conducted Experiment, Need Help Deciding Which T test to run, how to execute it.

I'm in an introductory research class at my college and have ran a basic experiment testing for word recall ability when using gender associated...

• Replies: 1
• Views: 1,826
05-06-2013, 01:52 AM
29. ### Proposed Research Design

I am a proposing a research topic and want to see if what I propose is possible given the data I have. If not, I would like to hear your ideas on how...

• Replies: 0
• Views: 1,320
05-05-2013, 05:04 PM
30. ### Experiment design and analysis for e-commerce

Hi i'm new to the forum and hopefully somebody wants to offer me a bit of advice. I'm carrying out a marketing choice experiment to estimate the...

• Replies: 1
• Views: 1,614
05-05-2013, 03:43 PM
31. ### Can someone confirm I have done this correct please

I have written my psychology results section for my dissertation, I have done a Spearmans rho and a Mann-Whitney to test my hypotheses. I would...

• Replies: 7
• Views: 1,821
137
05-01-2013, 01:06 PM

Hi everyone, I'm probably being a bit of a dunce but I can't for the life of me come to a conclusion of which statistical test to use for this...

• Replies: 5
• Views: 1,951
05-01-2013, 08:46 AM
33. ### Calculating the average variance of several normal distributed variables

Hi, I have the following problem. I'm trying to average several normal distributed variables. To make it more easy, I'm using z-scores. The...

• Replies: 0
• Views: 1,038
05-01-2013, 06:51 AM
34. ### statistically hopeless :(

I have a lot of trouble when it comes to statistics, i go to all my classes and lectures but i just can't seem to get my head around it :( i...

• Replies: 8
• Views: 1,699
04-30-2013, 05:20 PM
35. ### Can I even do this?

I have a complex design: Groups(2) x Repeated Measures(2) = Dependent scores (2). I want to measure effect of groups(treatment). I can use ANOVA...

• Replies: 6
• Views: 2,550
04-30-2013, 02:35 AM
36. ### Is it possible to use ANOVA with a Likert Scale questionnaire?

I am currently writing my dissertation and the deadline is getting close. I am really struggling with how to analyse my data - I had planned to do a...

• Replies: 5
• Views: 30,921
04-28-2013, 11:16 PM
37. ### Kruskall Wallis Test with unequal sample ratio

Hello everyone! Your help will be GREATLY appreciated!!! :tup: I have looked at the effects of perceived social status (working, middle, upper...

• Replies: 0
• Views: 1,799
04-27-2013, 02:51 PM
38. ### Fishing for significance

1) 2-level variable: I have a 2-level variable "Diagnosis" which represents a continous score (1=below, 2=above a "diagnosis" treshold). I want to...

• Replies: 2
• Views: 2,900
04-27-2013, 04:16 AM
39. ### Trouble understanding repeated-measures results

I'm not sure if it's because I have done something wrong, but firstly my mauchly's sphericity test has a df of 0 and a sig of just ( . ), but than i...

• Replies: 0
• Views: 1,128
04-26-2013, 08:44 PM
40. ### Help needed with 5 x 9 design statistics

Hello friends! Currently a final-year student, I've collected data for my dissertation project. I've carried out a pilot study with only two...

• Replies: 0
• Views: 1,009
04-26-2013, 10:02 AM

Hello everyone. I hope somebody can help. Responses will be greatly appreciated! Description of Experiment: I have asked participants to fill...

• Replies: 3
• Views: 2,716
04-26-2013, 07:50 AM
42. ### Interpreting an interaction in ANCOVA

Hi, I'm comparing two patient groups on a novel language measure (lets call it L1, linear variable). The groups did not differ on a more...

• Replies: 0
• Views: 3,627
04-26-2013, 04:49 AM
43. ### Help with which ANOVA to use

The study we are doing is examining the effect of positive and negative feedback on confidence. We're using a between-groups design with three...

• Replies: 1
• Views: 1,088
04-26-2013, 03:15 AM
44. ### Suppression?

Hello, In my model, I am looking at predictors of a variable, Y. In a path model, Y has 4 significant predictors lets call them A,B, C, and X (path...

• Replies: 0
• Views: 1,379
04-25-2013, 04:34 PM
45. ### NLSY79 Help - Longitudinal data in STATA

Hey, guys. I'm trying to use the National Longitudinal Survey Year 1979 data set in a multiple regression model. The data set has data from...

• Replies: 0
• Views: 1,915
04-24-2013, 04:12 PM
46. ### Regression Analysis with Dichotomous and Continuous Independent Variable .

Hello everyone! Your help is greatly appreciated. I have run a 3 x 2 factor between-participants ANOVA in SPSS, but my analysis yielded no...

• Replies: 2
• Views: 3,864
04-24-2013, 07:14 AM
47. ### Multilevel time series versus time series ARIMA models etc. Need help!!

Hi guys, Does someone knows the difference between multilevel time series analysis and the time serie ARIMA models etc.; or is it approximately...

• Replies: 3
• Views: 2,171
04-24-2013, 01:41 AM
48. ### Requesting Help with Dissertation

Hello friends! Currently a final-year student, I've collected data for my dissertation project but I'm not sure about which statistical test to...

• Replies: 0
• Views: 1,154
04-23-2013, 04:12 AM
49. ### SPSS - Independent t-test (Desperate for help!)

I am currently trying to complete my results section for my dissertation, I am looking at gender differences in attitudes towards domestic abuse. I...

• Replies: 3
• Views: 1,364
04-23-2013, 12:59 AM
50. ### Face validity VS Content Validity

Dear respected members, I'm developing an instrument to measure care dependency in home dwelling elderly. I want to test the validity of the...

• Replies: 0
• Views: 4,079
04-21-2013, 01:17 AM
51. ### Missing Data

Hi :wave:, I have a database that I am using data imputation techniques, but is not a normal matrix to apply a multivariate normal test, my question...

• Replies: 0
• Views: 1,272
04-20-2013, 05:41 PM
52. ### mean or median for reaction times?

Hi all, I have two groups who made a simple detection task in which reaction times was the only dependent variable (observed in different...

• Replies: 2
• Views: 3,911
04-19-2013, 09:03 AM
53. ### finding the effect of X on the relationship between Y and Z

I had a huge explanation and it got deleted, so here's a briefer version: I'm trying to find whether high trait empathy predicts a greater effect...

• Replies: 0
• Views: 1,914
04-18-2013, 07:00 PM
54. ### Help with which type of ANOVA to use?!

Hello, I'm trying to figure out which type of ANOVA I'd use in this situation. My question involves 3 different groups with measurements taken at...

• Replies: 2
• Views: 2,162
04-18-2013, 11:51 AM
55. ### How do you report Effect sizes for ANCOVA?

For ANOVA effect sizes you report n2 (in the correct format) but what do you do for effect sizes of ANCOVA? is it n2, r or r2??? Please HELP!

• Replies: 1
• Views: 3,454
04-18-2013, 09:22 AM
56. ### What should I do with this data?

Hello, I am a work psychologist and have been asked to evaluate some data as part of my job. I rarely get the opportunity to do something like...

• Replies: 1
• Views: 1,572
04-18-2013, 02:33 AM
57. ### Awful Design - how to handle it ?

Dear all, I have data from an experiment with what I think is an awful design. I need to type it into Excel (or directly into a statistical...

• Replies: 8
• Views: 2,158
04-17-2013, 12:18 AM
58. ### combining two scales with different number of items into one measurement

Hi, I have two different scales that measure children's' exposure to family violence. One is based on children's report on a single item, the other...

• Replies: 5
• Views: 3,438
04-16-2013, 08:45 AM

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