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Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

  1. Arrow Sticky Thread Sticky: Please Read This Before Posting

    Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

    Started by quark‎, 11-10-2005 12:21 AM
    • Replies: 0
    • Views: 31,369
    11-10-2005, 12:21 AM Go to last post
  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...

    Started by GentlemanA‎, 05-24-2013 02:27 PM
    cronbach's alpha
    • Replies: 8
    • Views: 3,173
    05-29-2013, 11:07 AM Go to last post
  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...

    Started by fraatsr‎, 04-23-2013 11:08 AM
    • Replies: 1
    • Views: 3,445
    05-28-2013, 05:36 PM Go to last post
  3. please help me

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

    Started by kavi‎, 05-28-2013 02:08 AM
    • Replies: 1
    • Views: 1,321
    05-28-2013, 02:35 AM Go to last post
  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...

    Started by lir6777‎, 05-27-2013 05:42 AM
    mixed models
    • Replies: 0
    • Views: 2,353
    05-27-2013, 05:42 AM Go to last post
  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...

    Started by Phoenix123‎, 05-25-2013 06:35 AM
    • Replies: 0
    • Views: 2,187
    05-25-2013, 06:35 AM Go to last post
  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...

    Started by mAcA‎, 05-24-2013 01:39 PM
    • Replies: 0
    • Views: 1,180
    05-24-2013, 01:39 PM Go to last post
  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...

    Started by Flavia‎, 05-24-2013 05:19 AM
    • Replies: 0
    • Views: 2,389
    05-24-2013, 05:19 AM Go to last post
  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...

    Started by navigo‎, 05-22-2013 08:41 PM
    • Replies: 1
    • Views: 1,950
    05-23-2013, 07:31 AM Go to last post
  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...

    Started by codma269‎, 05-22-2013 04:45 AM
    -test, archaeology, independent
    • Replies: 1
    • Views: 1,988
    05-22-2013, 06:34 AM Go to last post
  10. Question 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...

    Started by billcurtis‎, 12-13-2008 06:25 AM
    • Replies: 8
    • Views: 65,110
    05-22-2013, 05:09 AM Go to last post
  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...

    Started by natashaakaul‎, 05-15-2013 04:32 AM
    categorical data, categorical dependent, categorical predictors
    • Replies: 1
    • Views: 2,187
    05-21-2013, 11:26 PM Go to last post
  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...

    Started by lifeafter2am‎, 05-13-2013 10:10 AM
    • Replies: 1
    • Views: 1,741
    05-21-2013, 11:21 PM Go to last post
  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...

    Started by jamie157‎, 05-21-2013 05:13 AM
    • Replies: 4
    • Views: 2,617
    05-21-2013, 04:15 PM Go to last post
  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...

    Started by rosenmarsh‎, 05-21-2013 12:37 PM
    • Replies: 0
    • Views: 821
    05-21-2013, 12:37 PM Go to last post
  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...

    Started by Julia91‎, 05-21-2013 08:16 AM
    cbq, early cbq, same construct
    • Replies: 0
    • Views: 1,002
    05-21-2013, 08:16 AM Go to last post
  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...

    Started by Esme‎, 05-20-2013 01:29 PM
    mixed anova, planned comparisons, post hoc test, repeated measures anova
    • Replies: 3
    • Views: 2,256
    05-20-2013, 05:40 PM Go to last post
  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...

    Started by dwise75‎, 05-16-2013 11:23 AM
    multiple comparisons, t-tests
    • Replies: 1
    • Views: 891
    05-16-2013, 12:08 PM Go to last post
  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...

    Started by ReluctantStatistician‎, 05-14-2013 07:40 AM
    differencing, lag, time series
    • Replies: 1
    • Views: 4,677
    05-14-2013, 08:30 AM Go to last post
  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...

    Started by Liz004‎, 05-13-2013 08:33 AM
    • Replies: 0
    • Views: 3,161
    05-13-2013, 08:33 AM Go to last post
  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...

    Started by gradstudent11‎, 05-09-2013 11:34 PM
    • Replies: 4
    • Views: 2,769
    05-12-2013, 12:09 AM Go to last post
  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...

    Started by Demlo‎, 05-11-2013 09:51 AM
    • Replies: 0
    • Views: 1,171
    05-11-2013, 09:51 AM Go to last post
  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...

    Started by bipe15‎, 05-09-2013 03:58 PM
    analisys, data, start
    • Replies: 6
    • Views: 2,013
    05-10-2013, 02:06 PM Go to last post
  23. Post 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...

    Started by Terence‎, 05-10-2013 02:02 AM
    • Replies: 0
    • Views: 2,728
    05-10-2013, 02:02 AM Go to last post
  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...

    Started by JesseJames‎, 05-07-2013 11:30 PM
    • Replies: 2
    • Views: 1,285
    05-08-2013, 02:59 AM Go to last post
  25. Help with SPSS and which analyses?

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

    Started by grrriddle‎, 05-07-2013 03:02 PM
    • Replies: 1
    • Views: 1,267
    05-07-2013, 04:49 PM Go to last post
  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...

    Started by Grace‎, 05-05-2013 02:07 AM
    manova, matched-controls, multiple dv's, neurocognition, small sample size
    • Replies: 2
    • Views: 2,068
    05-06-2013, 09:09 PM Go to last post
  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...

    Started by noetsi‎, 05-06-2013 02:17 PM
    • Replies: 1
    • Views: 3,543
    05-06-2013, 06:33 PM Go to last post
  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...

    Started by Josh1232‎, 05-05-2013 05:26 PM
    • Replies: 1
    • Views: 1,826
    05-06-2013, 01:52 AM Go to last post
  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...

    Started by DaNegotiator‎, 05-05-2013 05:04 PM
    • Replies: 0
    • Views: 1,320
    05-05-2013, 05:04 PM Go to last post
  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...

    Started by defected‎, 04-27-2013 12:56 PM
    anova, binary logit, experiment analysis, experiment design
    • Replies: 1
    • Views: 1,614
    05-05-2013, 03:43 PM Go to last post
  31. what kind of sampling to use and in what measurefor the research to be valid?

    Hello, I have a difficulty with my doctoral research. I have to measure risk factors for antisocial behaviors at the group age 13-17 years old...

    Started by juljana‎, 05-03-2013 05:43 PM
    • Replies: 0
    • Views: 1,272
    05-03-2013, 05:43 PM Go to last post
  32. Post 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...

    Started by 137‎, 04-30-2013 06:37 PM
    • Replies: 7
    • Views: 1,821
    05-01-2013, 01:06 PM Go to last post
  33. Help about which test to use please?

    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...

    Started by Bobbydavro‎, 04-25-2013 05:22 AM
    • Replies: 5
    • Views: 1,951
    05-01-2013, 08:46 AM Go to last post
  34. 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...

    Started by fraatsr‎, 05-01-2013 06:51 AM
    average, normal distribution
    • Replies: 0
    • Views: 1,038
    05-01-2013, 06:51 AM Go to last post
  35. 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...

    Started by statisticsdud‎, 04-30-2013 12:48 AM
    • Replies: 8
    • Views: 1,699
    04-30-2013, 05:20 PM Go to last post
  36. 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...

    Started by thepts‎, 04-29-2013 01:40 AM
    • Replies: 6
    • Views: 2,550
    04-30-2013, 02:35 AM Go to last post
  37. 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...

    Started by Rose175‎, 04-28-2013 11:01 AM
    anova, dissertation, one way anova, psychology, spss
    • Replies: 5
    • Views: 30,921
    04-28-2013, 11:16 PM Go to last post
  38. 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...

    Started by Taote‎, 04-27-2013 02:51 PM
    • Replies: 0
    • Views: 1,799
    04-27-2013, 02:51 PM Go to last post
  39. 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...

    Started by thepts‎, 04-27-2013 03:59 AM
    • Replies: 2
    • Views: 2,900
    04-27-2013, 04:16 AM Go to last post
  40. 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...

    Started by halona‎, 04-26-2013 08:44 PM
    • Replies: 0
    • Views: 1,128
    04-26-2013, 08:44 PM Go to last post
  41. Question 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...

    Started by orvokki‎, 04-26-2013 10:02 AM
    • Replies: 0
    • Views: 1,009
    04-26-2013, 10:02 AM Go to last post
  42. Mann-Whitney/ Kruskall Wallis Test PLEASE HELP

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

    Started by Taote‎, 04-25-2013 06:23 PM
    • Replies: 3
    • Views: 2,716
    04-26-2013, 07:50 AM Go to last post
  43. 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...

    Started by Fezz‎, 04-26-2013 04:49 AM
    • Replies: 0
    • Views: 3,627
    04-26-2013, 04:49 AM Go to last post
  44. 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...

    Started by Zimmer24‎, 04-25-2013 08:33 PM
    • Replies: 1
    • Views: 1,088
    04-26-2013, 03:15 AM Go to last post
  45. 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...

    Started by SLLancaster‎, 04-25-2013 04:34 PM
    • Replies: 0
    • Views: 1,379
    04-25-2013, 04:34 PM Go to last post
  46. Lightbulb 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...

    Started by chickensandllamas‎, 04-24-2013 04:12 PM
    • Replies: 0
    • Views: 1,915
    04-24-2013, 04:12 PM Go to last post
  47. 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...

    Started by David88‎, 04-22-2013 02:54 PM
    • Replies: 2
    • Views: 3,864
    04-24-2013, 07:14 AM Go to last post
  48. 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...

    Started by emmab1990‎, 04-23-2013 05:25 PM
    • Replies: 3
    • Views: 2,171
    04-24-2013, 01:41 AM Go to last post
  49. Exclamation 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...

    Started by orvokki‎, 04-23-2013 04:12 AM
    • Replies: 0
    • Views: 1,154
    04-23-2013, 04:12 AM Go to last post
  50. 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...

    Started by Becca91‎, 04-16-2013 05:20 AM
    • Replies: 3
    • Views: 1,364
    04-23-2013, 12:59 AM Go to last post
  51. 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...

    Started by febriana_zz‎, 04-21-2013 01:17 AM
    content validity, face validity, interpretability
    • Replies: 0
    • Views: 4,079
    04-21-2013, 01:17 AM Go to last post
  52. 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...

    Started by adejota‎, 04-20-2013 05:41 PM
    little's, missing data analysis, missing data imputation
    • Replies: 0
    • Views: 1,272
    04-20-2013, 05:41 PM Go to last post
  53. 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...

    Started by .elena.‎, 04-19-2013 04:04 AM
    • Replies: 2
    • Views: 3,911
    04-19-2013, 09:03 AM Go to last post
  54. 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...

    Started by cairoan‎, 04-18-2013 07:00 PM
    correlation, problem, regression, science
    • Replies: 0
    • Views: 1,914
    04-18-2013, 07:00 PM Go to last post
  55. Research methods - Comparing high and low risk sports

    I am currently conducting a piece of research that aims to find if there is a difference between personality traits between participants of high and...

    Started by dannydoy‎, 04-18-2013 12:37 PM
    • Replies: 2
    • Views: 1,161
    04-18-2013, 12:59 PM Go to last post
  56. 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...

    Started by amycardinal‎, 04-13-2013 07:49 PM
    anova, help needed, repeated measures
    • Replies: 2
    • Views: 2,162
    04-18-2013, 11:51 AM Go to last post
  57. 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!

    Started by emmaPex‎, 04-18-2013 09:11 AM
    • Replies: 1
    • Views: 3,454
    04-18-2013, 09:22 AM Go to last post
  58. 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...

    Started by Psychobabblist‎, 04-17-2013 12:21 PM
    • Replies: 1
    • Views: 1,572
    04-18-2013, 02:33 AM Go to last post
  59. 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...

    Started by Yankel‎, 04-15-2013 06:59 AM
    • Replies: 8
    • Views: 2,158
    04-17-2013, 12:18 AM Go to last post
  60. 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...

    Started by shiradvir‎, 04-16-2013 05:38 AM
    • Replies: 5
    • Views: 3,438
    04-16-2013, 08:45 AM Go to last post

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