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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: 32,204
11-10-2005, 12:21 AM
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...

• Replies: 2
• Views: 195,715
01-28-2011, 09:20 AM
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...

• Replies: 1
• Views: 111,392
06-01-2011, 04:50 PM
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...

• Replies: 20
• Views: 108,562
07-16-2014, 10:01 PM
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....

• Replies: 8
• Views: 108,170
08-30-2012, 02:00 AM
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...

• Replies: 3
• Views: 103,786
01-19-2011, 11:56 AM
6. 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: ...

• Replies: 15
• Views: 81,403
09-09-2010, 05:05 PM
7. 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....

• Replies: 4
• Views: 71,616
10-24-2005, 08:31 AM
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...

• Replies: 9
• Views: 66,561
04-26-2015, 08:05 PM
9. 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: 66,306
05-22-2013, 05:09 AM
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...

• Replies: 3
• Views: 50,214
02-19-2006, 11:49 AM
11. 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...

• Replies: 4
• Views: 45,834
05-14-2011, 08:42 AM
12. 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...

• Replies: 1
• Views: 43,981
01-12-2012, 11:36 PM
13. 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...

• Replies: 2
• Views: 40,818
02-26-2009, 03:00 AM
14. 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...

• Replies: 21
• Views: 40,074
10-24-2016, 04:47 PM
15. 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,...

• Replies: 13
• Views: 38,947
11-25-2015, 03:39 PM
16. 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...

• Replies: 3
• Views: 36,677
03-05-2009, 08:28 AM
17. 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...

• Replies: 4
• Views: 35,836
01-25-2011, 08:58 PM
18. 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...

• Replies: 10
• Views: 34,454
01-11-2012, 12:46 PM
19. 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...

• Replies: 2
• Views: 34,437
12-04-2010, 01:27 AM
20. 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...

• Replies: 6
• Views: 33,785
02-21-2011, 04:43 AM
21. 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...

• Replies: 1
• Views: 32,858
07-23-2007, 06:17 PM
22. 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: 32,121
04-28-2013, 11:16 PM
23. 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...

• Replies: 6
• Views: 31,715
04-07-2011, 07:45 AM
24. 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...

• Replies: 5
• Views: 31,512
10-17-2012, 07:47 AM
25. 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...

• Replies: 3
• Views: 31,145
01-26-2006, 02:54 PM
26. 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...

• Replies: 4
• Views: 29,077
09-13-2010, 09:53 PM
27. 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...

• Replies: 4
• Views: 28,401
07-06-2009, 12:12 AM
28. 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 =...

• Replies: 12
• Views: 27,923
jim
06-08-2012, 06:02 AM
29. 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...

• Replies: 16
• Views: 26,307
04-13-2013, 06:43 PM
30. 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...

• Replies: 2
• Views: 26,098
08-03-2011, 11:44 AM
31. 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...

• Replies: 6
• Views: 25,679
03-13-2011, 03:50 AM
32. 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...

• Replies: 8
• Views: 25,412
03-31-2013, 09:55 PM
33. 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...

• Replies: 1
• Views: 24,033
09-23-2006, 06:04 AM
34. 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 -...

• Replies: 3
• Views: 20,306
06-20-2012, 02:07 PM
35. 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...

• Replies: 2
• Views: 20,189
11-24-2009, 06:37 AM
36. 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...

• Replies: 2
• Views: 19,754
12-02-2008, 06:14 AM
37. 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....

• Replies: 32
• Views: 19,638
09-07-2015, 06:00 AM
38. 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 ...

• Replies: 5
• Views: 19,611
09-20-2013, 12:46 AM
39. 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...

• Replies: 3
• Views: 19,295
11-30-2010, 11:43 PM
40. 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....

• Replies: 4
• Views: 18,867
06-29-2008, 07:55 AM
41. 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!

• Replies: 12
• Views: 18,690
02-06-2014, 10:31 PM
42. 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...

• Replies: 1
• Views: 18,072
09-07-2006, 12:43 PM
43. 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...

• Replies: 4
• Views: 17,826
05-04-2006, 05:21 AM
44. 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...

• Replies: 5
• Views: 17,526
09-27-2007, 05:35 PM
45. 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...

• Replies: 6
• Views: 17,406
03-04-2013, 03:12 PM
46. 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...

• Replies: 3
• Views: 17,316
04-24-2014, 06:46 PM
47. 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....

• Replies: 8
• Views: 17,187
10-20-2008, 09:55 AM
48. 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,...

• Replies: 6
• Views: 16,977
04-25-2008, 02:53 PM
49. 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...

• Replies: 2
• Views: 16,147
01-13-2011, 12:26 PM
50. 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...

• Replies: 4
• Views: 15,836
06-13-2011, 10:51 AM
51. 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...

• Replies: 7
• Views: 15,711
01-04-2011, 04:29 PM
52. 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...

• Replies: 3
• Views: 15,422
05-18-2014, 04:09 PM
53. 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...

• Replies: 2
• Views: 15,289
02-19-2009, 05:02 PM
54. 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...

• Replies: 42
• Views: 14,958
06-24-2014, 11:13 AM
55. 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...

• Replies: 0
• Views: 14,846
02-24-2014, 01:17 PM
56. 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...

• Replies: 1
• Views: 14,787
06-26-2007, 01:37 PM
57. 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....

• Replies: 0
• Views: 14,586
Ken
06-23-2009, 11:13 AM

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