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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: 32,204
    11-10-2005, 12:21 AM Go to last post
  1. Meta-analysis - Obtaining r from t, F, or χ2

    Help! It is common in meta-analyses to find the following statement, or something very like it: "The present meta-analysis includes studies that...

    Started by jdoyle‎, 01-17-2011 06:57 PM
    effect sizes; r, meta-analysis
    • Replies: 2
    • Views: 195,715
    01-28-2011, 09:20 AM Go to last post
  2. Variable made of composite Likert scores—interval or ordinal?

    It's a minor issue, but I really appreciate any advice! I have an "attitudinal ambivalence" variable calculated using the following formula: (P...

    Started by Pachy‎, 05-31-2011 10:13 PM
    • Replies: 1
    • Views: 111,392
    06-01-2011, 04:50 PM Go to last post
  3. 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...

    Started by helpwithstats‎, 06-03-2008 02:42 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 108,562
    07-16-2014, 10:01 PM Go to last post
  4. Two-way ANOVA with interaction – what to do?

    I have a set-up with 4 groups of mice; Genotype (+/+ and -/-) and diet (high salt and low salt), and am using Graph Pad Prism to analyze my data....

    Started by mstaehr‎, 08-24-2012 04:10 AM
    • Replies: 8
    • Views: 108,170
    08-30-2012, 02:00 AM Go to last post
  5. Pseudo replication – how to handle repeated measures over time?

    Hi, I am looking at social networks and I want to look at the position of individuals, and whether a certain class of individual (e.g. older...

    Started by Emma2415‎, 01-18-2011 05:43 AM
    • Replies: 3
    • Views: 103,786
    01-19-2011, 11:56 AM Go to last post
  6. Smile Need some help calculating standard error of multiple regression coefficients

    Hello. I am an undergrad student not very familiar with advanced statistics. Thus, I figured someone on this forum could help me in this regard: ...

    Started by joseph.ej‎, 07-21-2008 06:52 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 81,403
    09-09-2010, 05:05 PM Go to last post
  7. Post Interpreting means from likert scale data

    Hello, I work for a government department in Australia. The department runs an annual opinion survey with 5 point likert scale response items....

    Started by Adrian Seabrook‎, 10-23-2005 08:13 PM
    • Replies: 4
    • Views: 71,616
    10-24-2005, 08:31 AM Go to last post
  8. ANOVA post-hoc tests: Bonferroni, LSD, or Tukey?

    Hi guys, Not knowing much on the differences between the above tests, which would you recommend for my ANOVA post hoc tests? I was using...

    Started by Lolly‎, 08-16-2013 07:27 AM
    • Replies: 9
    • Views: 66,561
    04-26-2015, 08:05 PM Go to last post
  9. 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: 66,306
    05-22-2013, 05:09 AM Go to last post
  10. How to calculate z-Score

    Hello I have huge problem cause i have a test on tuesday and don't know anything about z-scores. Here is the question: Agricultural scientists...

    Started by rubberduck‎, 02-18-2006 05:20 AM
    • Replies: 3
    • Views: 50,214
    02-19-2006, 11:49 AM Go to last post
  11. Interpreting interaction terms in multiple regression

    Hi everybody, I'm a master's student who's working on the last analysis for my thesis project. I'm studying possible predictors of satisfaction in...

    Started by K Wilson‎, 04-14-2006 02:47 PM
    • Replies: 1
    • Views: 47,896
    04-14-2006, 10:10 PM Go to last post
  12. What test to use? Correlation/regression VS ANOVA

    Hi all. I have a very shallow understanding of statisitics so would really appreciate if someone could help me with what test to use. Say I have...

    Started by paulsmith89‎, 05-13-2011 12:46 PM
    anova, correlation, regression, spss, which test
    • Replies: 4
    • Views: 45,834
    05-14-2011, 08:42 AM Go to last post
  13. How to create groups in SPSS out of previously entered and analysed data?

    I'm conducting a study on the development of a depression scale to use within a particular population. Using the distribution of the sum of each...

    Started by Maddy‎, 01-12-2012 04:02 PM
    • Replies: 1
    • Views: 43,981
    01-12-2012, 11:36 PM Go to last post
  14. Residual Calculation

    Can anyone please explain to me how to calculate the residual in this case? Yp=28.6+1.12(x1)+(-.49)(x2)+.8(x3)+e Yp=predicted number...

    Started by bosoxbb‎, 02-25-2009 10:07 PM
    • Replies: 2
    • Views: 40,818
    02-26-2009, 03:00 AM Go to last post
  15. Composite reliability vs Cronbach's alpha

    Hello Wondering if someone could clarify I'm developing a new measure with 10 constructs. Each construct has between 4 - 6 items. I've...

    Started by anon2000‎, 09-09-2014 03:02 AM
    2 Pages
    1 2
    composite reliability, cronbach's alpha, questionnaire development, reliability
    • Replies: 21
    • Views: 40,074
    10-24-2016, 04:47 PM Go to last post
  16. Help in Levene's test, Please

    Hi, I did an experiment, studying on the effects of types of sugar and their concentrations on milk spoilage. The sugars I was using are sucrose,...

    Started by bom_bomkung‎, 11-30-2006 09:51 PM
    • Replies: 13
    • Views: 38,947
    11-25-2015, 03:39 PM Go to last post
  17. What does t-statistics (paired t-test) tell us?

    Hello, I'm Max and this is my first time posting here.First let me just say how relieved and grateful I am to now know that there exists a help...

    Started by art.sibu‎, 03-03-2009 10:08 AM
    • Replies: 3
    • Views: 36,677
    03-05-2009, 08:28 AM Go to last post
  18. How many hypotheses can you test in one study

    It is very common that articles in psychology has three or four hypotheses. Technically, this cause an inflation in alpha value, but it seems...

    Started by TLB‎, 01-25-2011 07:21 AM
    • Replies: 4
    • Views: 35,836
    01-25-2011, 08:58 PM Go to last post
  19. Requirements for post-hoc after ANOVA (sig main effect, interaction, etc)

    I have a question about ANOVA post-hoc tests in general, with a specific example. In general, I was wondering if you need a significant main effect...

    Started by harync‎, 01-09-2012 11:06 AM
    • Replies: 10
    • Views: 34,454
    01-11-2012, 12:46 PM Go to last post
  20. SPSS => How to delete cases?

    Hi there, hope some of you can help. I am using SPSS version 18, I have a merged my data set from a longitudinal investigation of 2000 users...

    Started by PetterBB‎, 11-30-2010 10:12 PM
    • Replies: 2
    • Views: 34,437
    12-04-2010, 01:27 AM Go to last post
  21. Multivariate normality

    Hi, I'm currently doing a study to analyze the relationships amongst two sets of variables using canonical correlation analysis. One of the...

    Started by Star7‎, 02-16-2011 09:33 PM
    • Replies: 6
    • Views: 33,785
    02-21-2011, 04:43 AM Go to last post
  22. Question Convert mean and variance of lognormal to normal distribution

    Hello, If I know the mean(mu) and variance(sigmasquared) of the lognormal distribution, can I obtain the mean and variance of normal distribution...

    Started by shobana‎, 07-13-2007 11:17 AM
    • Replies: 1
    • Views: 32,858
    07-23-2007, 06:17 PM Go to last post
  23. 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: 32,121
    04-28-2013, 11:16 PM Go to last post
  24. Difference between the strength and the significance of a correlation

    I think this quite a "classical" correlation/regression question, but I haven't been able to find an answer for it in any textbooks, so I'm hoping...

    Started by wildetudor‎, 04-05-2011 01:19 PM
    • Replies: 6
    • Views: 31,715
    04-07-2011, 07:45 AM Go to last post
  25. Calculating Bonferroni correction

    I have a correlation matrix with an extremely large number of statistically significant correlations. One of my advisers said I should apply the...

    Started by ctobola‎, 04-16-2011 05:15 AM
    • Replies: 5
    • Views: 31,512
    10-17-2012, 07:47 AM Go to last post
  26. Rank order data analysis

    I need the appropiate statistic tool to solve the following case: I have done several experiments to 15 subjects. Each subject rank 6 samples...

    Started by verde‎, 01-26-2006 11:35 AM
    • Replies: 3
    • Views: 31,145
    01-26-2006, 02:54 PM Go to last post
  27. How to analyze Likert survey data?

    I've been asked to analyze some subjective survey data. This is a new challenge for me. My previous training and experience has been with measured...

    Started by SlideRule‎, 09-13-2010 02:49 PM
    • Replies: 4
    • Views: 29,077
    09-13-2010, 09:53 PM Go to last post
  28. Bonferroni correction in correlations: is it necessary?

    Hi all! I am new here and a beginner in statistics, so please help with this one: My objective is to classify texts in two classes, fiction and...

    Started by MaGiStat‎, 06-05-2009 03:16 AM
    • Replies: 4
    • Views: 28,401
    07-06-2009, 12:12 AM Go to last post
  29. Comparing Regression Coefficients between Two Models

    I am running two regressions, each with the same independent variables but with two different dependent variables. Y = b1 + b2*X + b3*C (1) Z =...

    Started by Mike78‎, 06-11-2010 06:18 PM
    • Replies: 12
    • Views: 27,923
    06-08-2012, 06:02 AM Go to last post
  30. Likert scale, parametric or nonparametric?

    Hello, first post here. I apologize if it is a stupid question (but then again, that'll make it easier to answer:)) I am training to be a...

    Started by 11jono11‎, 12-11-2010 10:02 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 26,307
    04-13-2013, 06:43 PM Go to last post
  31. lower bound of true significance - what does this mean?!

    I've been doing tests of normal distribution (Kolmogorov-Smirnoff tests) and next to some of the significances in SPSS it has an asterix and then it...

    Started by Kari‎, 08-02-2011 10:46 AM
    • Replies: 2
    • Views: 26,098
    08-03-2011, 11:44 AM Go to last post
  32. Lightbulb how to carry out moderation in SPSS?

    I am carrying out a multiple regression on well-being but as well I would love to check if Sense of Control (moderator) moderates the relationship...

    Started by diligentia‎, 03-07-2011 11:29 AM
    • Replies: 6
    • Views: 25,679
    03-13-2011, 03:50 AM Go to last post
  33. P values, correlation analysis and sample size.

    Hi all, A question regarding the relationship between p values, correlation analysis and sample size... If I obtain a p = .036 for a...

    Started by Jasmine‎, 03-23-2012 06:42 AM
    • Replies: 8
    • Views: 25,412
    03-31-2013, 09:55 PM Go to last post
  34. Chebyshev's Theorem and Empirical Rule

    I am having a hard time understanding the following. The information leading up to the question goes as follows: " A major cab company in Chicago...

    Started by squeze@hotmail.com‎, 09-23-2006 12:39 AM
    • Replies: 1
    • Views: 24,033
    09-23-2006, 06:04 AM Go to last post
  35. Question index of agreement calculation?

    Hi, I'm doing some research and need to calculate the level of agreement on the answers of some questionnaire. It has 28 items, Lickert scale 1 -...

    Started by andra‎, 06-17-2012 06:05 PM
    • Replies: 3
    • Views: 20,306
    06-20-2012, 02:07 PM Go to last post
  36. 3x2 factorial design: which test is better?

    Hi all, I need to analyze a 3x2 factorial design (3 treatments x 2 gender) and I'd like to hear your suggestions. A population of rabbits was...

    Started by trimz79‎, 11-23-2009 05:02 AM
    • Replies: 2
    • Views: 20,189
    11-24-2009, 06:37 AM Go to last post
  37. What is the AIC formula?

    Hi, I'm looking for AIC (Akaike's Information Criterion) formula in the special case of least squares (LS) estimation with normally distributed...

    Started by re444‎, 11-28-2008 04:06 PM
    • Replies: 2
    • Views: 19,754
    12-02-2008, 06:14 AM Go to last post
  38. SEM with categorical variable/parceling/how to enter in AMOS?

    I need to do an SEM and I'm stumped about what to do with one of my variables, which is a nominal categorical variable (previous experience in x vs....

    Started by buntington‎, 04-14-2014 02:56 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 19,638
    09-07-2015, 06:00 AM Go to last post
  39. Singular correlation matrix problem

    I'm using principal components to reduce problem dimension. I obtain correlation matrix whose determinant is about 10^(-13) as the result of ...

    Started by kobylkinks‎, 08-04-2008 06:30 AM
    • Replies: 5
    • Views: 19,611
    09-20-2013, 12:46 AM Go to last post
  40. Overlapping error bars and (non)significance

    Hello everybody, I am a bit confused about graphs that aim to show (non)significant differences between multiple-measure variables (i.e. random...

    Started by wildetudor‎, 10-19-2010 06:36 PM
    • Replies: 3
    • Views: 19,295
    11-30-2010, 11:43 PM Go to last post
  41. Smile P-value for trend of proportions.

    I need to calculate the p-value of a trend of proportions. What test do I use and can I do this simply in Excel? Proportions are 8.05; 8.94; 9.38....

    Started by PacificT‎, 06-07-2008 01:09 PM
    • Replies: 4
    • Views: 18,867
    06-29-2008, 07:55 AM Go to last post
  42. How to enter ordinal data into SPSS?

    Hi I just wanted to know if there is supposed to be a different way to enter ordinal data, I have never done this before!

    Started by Preeti21‎, 04-12-2011 11:46 PM
    • Replies: 12
    • Views: 18,690
    02-06-2014, 10:31 PM Go to last post
  43. My F Value equals zero

    I am using repeated measures analysis with the mixed procedure in SAS. Comparing two periods with about 11 subjects. I have a non-significant P...

    Started by sturgeon‎, 09-07-2006 12:31 PM
    • Replies: 1
    • Views: 18,072
    09-07-2006, 12:43 PM Go to last post
  44. uneven group sizes

    If I want to compare the means of two groups but the group sizes are uneven (230 and 25) what is the best test to use? I am basically trying to...

    Started by kowalsks‎, 05-03-2006 09:48 AM
    • Replies: 4
    • Views: 17,826
    05-04-2006, 05:21 AM Go to last post
  45. Stochastic vs. deterministic

    Randomly sample the number of points defined (e.g. 10 points) from a normal distribution with a mean value x1 and standard deviation s1 to represent...

    Started by anon9430‎, 07-31-2007 10:57 AM
    • Replies: 5
    • Views: 17,526
    09-27-2007, 05:35 PM Go to last post
  46. Using skewed data in a regression

    Hi, I was wondering if anyone could help me. I am conducting a mediation analysis with regression and one of the variables in negatively skewed the z...

    Started by Jfield7‎, 03-01-2013 07:06 AM
    mediation analysis, regression, skewed
    • Replies: 6
    • Views: 17,406
    03-04-2013, 03:12 PM Go to last post
  47. AIDS Attitude Scale (Likert Scale Analysis)

    I hope someone could help me on likert scale analysis. Research title: Attitude towards AIDS amongst Pharmacy Students Questionnaire is already...

    Started by prash32‎, 11-07-2010 02:51 AM
    • Replies: 4
    • Views: 17,324
    11-07-2010, 04:33 AM Go to last post
  48. Question Reporting Non-Parametric Data: Median or Mean (or both)?

    At the most simple level, my question is which descriptive statistics are the most kosher for reporting when using nonparametric tests like...

    Started by metageek‎, 04-23-2014 07:14 PM
    • Replies: 3
    • Views: 17,316
    04-24-2014, 06:46 PM Go to last post
  49. Error estimation from chi-square alone?

    All, I've been looking around for half an hour, seeing if my problem has already been addressed, and this seems to be a pretty interesting place....

    Started by chi-cube‎, 10-16-2008 12:17 PM
    • Replies: 8
    • Views: 17,187
    10-20-2008, 09:55 AM Go to last post
  50. Exclamation Comparing sample data with population data to check representativeness - How?

    Dear All, I have a small problem here and I hope someone can help me. I did survey at a university department with around 300 people. I have thus...

    Started by hocknlim‎, 05-21-2008 03:35 AM
    • Replies: 3
    • Views: 17,182
    07-04-2008, 12:01 PM Go to last post
  51. univariate analysis of variance

    I used univariate analysis of variance to check for differences between age groups on a measure. The F value was .011, which was significant,...

    Started by barry‎, 09-22-2005 01:12 AM
    • Replies: 6
    • Views: 16,977
    04-25-2008, 02:53 PM Go to last post
  52. KMO bartlett's test not appearing in SPSS

    Hi everyone, I'm attempting to run a factor analysis. I'm checking the box for these tests, but they are not appearing in the output screen. Anyone...

    Started by Jello‎, 12-12-2010 10:21 AM
    • Replies: 2
    • Views: 16,147
    01-13-2011, 12:26 PM Go to last post
  53. Scatterplot in SPSS with 2 variables

    Hello, I have a new question related to the last but this time a new problem has arisen. I am trying to create a scatterplot in SPSS with...

    Started by okiedokie‎, 06-08-2011 09:22 AM
    • Replies: 4
    • Views: 15,836
    06-13-2011, 10:51 AM Go to last post
  54. Question chi square/Fisher's Exact and one tailed hypothesis?

    Am completing a small scale project looking at the portrayal of gender in advertising for an Open University psychology course. Getting to grips with...

    Started by Butterbean‎, 12-20-2010 03:51 PM
    • Replies: 7
    • Views: 15,711
    01-04-2011, 04:29 PM Go to last post
  55. Modification Indices

    I am struggling with how to interpret some of the modification indices in AMOS SEM output and would appreciate any feedback you can offer! I have...

    Started by buntington‎, 05-17-2014 09:55 PM
    • Replies: 3
    • Views: 15,422
    05-18-2014, 04:09 PM Go to last post
  56. comparing two time curves - significantly different?

    Hi all, from a science project where we measured the change of a biological parameter over time, we have two curves to compare. A part of my...

    Started by walfrieda‎, 06-14-2008 03:12 PM
    • Replies: 2
    • Views: 15,289
    02-19-2009, 05:02 PM Go to last post
  57. 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...

    Started by statanx‎, 09-07-2012 02:26 AM
    3 Pages
    1 2 3
    • Replies: 42
    • Views: 14,958
    06-24-2014, 11:13 AM Go to last post
  58. Question Reliability - ω Omega (total/hierarchical

    Hola! I would like to ask about the total (ωt) and hierarchical omega (ωh) as far as interpretation differences are concerned. And one more...

    Started by Martin Marko‎, 02-24-2014 01:17 PM
    • Replies: 0
    • Views: 14,846
    02-24-2014, 01:17 PM Go to last post
  59. Which test to use with small sample size?

    Any ideas would be appreciated. I have completed an experiment whereby an independent samples t-test is significant and effect size is moderate to...

    Started by mathisfun‎, 05-19-2007 11:52 AM
    • Replies: 1
    • Views: 14,787
    06-26-2007, 01:37 PM Go to last post
  60. Granger causality test - Interpretation of results-help

    Hi all, Currently I am conducting small research how economic growth and financial development interact with each other and what causes whom....

    Started by Ken‎, 06-23-2009 11:13 AM
    • Replies: 0
    • Views: 14,586
    06-23-2009, 11:13 AM Go to last post

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