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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### Sticky: Proof of the day

In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

• Replies: 14
• Views: 18,691
10-11-2014, 12:02 PM
1. ### Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

• Replies: 2
• Views: 14,687
10-04-2010, 06:41 PM
2. ### Using likert scale data and nominal, ratio scale data for Partial Correlation

Hi All, If Pearson correlation is used through Partial Correlation (on SPSS) for measuring variables measured on a Likert Scale, can we use...

• Replies: 3
• Views: 14,564
10-07-2010, 08:03 PM
3. ### What Measure - Nominal, Ordinal, Scale? SPSS

I'm using SPSS to enter data and I just want to make sure I picked the appropriate measure for each variable State - Nominal Population - Scale...

• Replies: 1
• Views: 14,415
12-14-2010, 07:22 PM
4. ### Pilot Study Numbers

What is an appropriate number of responses for a pilot study? I'm trying to find something in the literature to support the size. Specifically, since...

• Replies: 4
• Views: 14,234
11-11-2008, 01:27 PM
5. ### (Using R) What’s the right test to compare for significance?

First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! I’ve been...

• Replies: 0
• Views: 13,688
05-24-2013, 05:47 AM
6. ### General vs Generalized Linear Models

While defending my thesis yesterday, this difference was pointed out. Surprised that there was actually a difference I wasn't aware of, I've looked...

• Replies: 12
• Views: 13,614
06-23-2015, 12:52 PM
7. ### Need help on SEM analysis using AMOS

After defining my model when I run the analysis, it gives me a message that "The specified model is probably unidentified. In order to achieve...

• Replies: 1
• Views: 13,368
06-04-2012, 12:31 PM
8. ### Pre/Post-Survey Methodology Question

I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

• Replies: 5
• Views: 13,166
01-06-2012, 06:35 AM
9. ### Shapley Value

Hi, I'm trying to get a "Shapley Value" for determining each attributes utilities. I've already heard this could be done with simple excel or...

• Replies: 10
• Views: 13,147
09-28-2012, 09:44 AM
10. ### What test can I use to compare categorical and continuous variables?

Hello guys: I have two sets of data, actual outcome (live vs. dead), which is categorical, and a risk adjustment predicted outcome, which is...

• Replies: 14
• Views: 13,019
08-09-2011, 02:58 PM
11. ### Regression line slope for R^2 ~= 1

Sorry if my question is answered in textbooks! I was wondering what the slope would be for the regression line of a regression that has an R squared...

• Replies: 9
• Views: 12,787
03-31-2011, 07:02 AM
12. ### Linear Mixed Models in SPSS for repeated measures

I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

• Replies: 13
• Views: 12,644
08-08-2011, 04:38 AM
13. ### Correlation vs ANOVA

Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

• Replies: 6
• Views: 12,644
01-23-2013, 04:18 PM
14. ### How to report t-test results

Hi, Im having trouble writting the result of a null hypothesis. so far this was the template i was using when reporting the result of a...

• Replies: 1
• Views: 12,619
10-20-2011, 11:45 PM
15. ### mediate?? what does this word mean in terms of statistics?

I know mediate in normal terms refers to intervening to to being agreement or reconciliation but in terms of statistics is it different? For example...

• Replies: 4
• Views: 12,614
10-13-2011, 05:05 PM
16. ### Analysis of 5 point Likert Scale Data

I am working on analysis of a survey conducted with a 5 point likert agreement scale. I need to explain why 70&#37; agreement (combined agreed and...

• Replies: 1
• Views: 12,337
12-15-2009, 08:47 PM
17. ### Directional or Non-directional Hypothesis for Independant t-test?

I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

• Replies: 8
• Views: 12,301
12-27-2011, 02:48 PM
18. ### 2 x 4 Factorial Design and contrasts...

Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

• Replies: 2
• Views: 12,289
11-30-2008, 11:37 PM
19. ### Two independent, non-metric categorical variables: which test to use?

:)Hello! I am new to this forum so first I would like to say hi to everybody and already thank you in advance for your kindness to help me on my...

• Replies: 2
• Views: 12,259
07-19-2011, 08:50 AM
20. ### Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

• Replies: 0
• Views: 12,173
04-04-2009, 12:32 PM
21. ### Random or fixed slope in hlm?

Hello, I am doing multilevel analysis and I am not sure whether I should include a random slope or not. The Wald test produces the following...

• Replies: 12
• Views: 12,118
08-19-2012, 03:27 PM
22. ### Which data types & correlation method?

Dear all, I'm a new graduate student and not yet proficient at statistics in research. Please help me confirm/correct the following questions. ...

• Replies: 3
• Views: 12,084
09-28-2011, 11:17 AM
23. ### t-test or Mann-Whitney test, regular research problem, need help

Hello, it looks like a most frequent research problem, but I am confused, so need help. I have 2 groups of data to compare: group 1 - people...

• Replies: 6
• Views: 11,975
10-09-2012, 06:01 AM
24. ### Grou x Time interactions

Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

• Replies: 2
• Views: 11,779
01-10-2011, 05:26 AM
25. ### how to calculate Factor Scores?

Hello folks, I need to know how to calculate factor score in Principal Component Analysis. I know in SPSS, it gives option of calculating it using...

• Replies: 2
• Views: 11,745
11-23-2010, 12:28 PM
26. ### Reporting non-statistically significant t-test

If we assess that with alpha=.05 and beta=.8 we can evaluate the statistical power to detect effect sizes based on the sample. 783 participants are...

• Replies: 10
• Views: 11,701
02-24-2012, 03:33 PM
27. ### paired t test and simple linear regression

Two repeatedly measured samples: 15 subjects were measured by two different machines (old and new) for their weight subject machine 1 machine...

• Replies: 3
• Views: 11,374
07-06-2011, 05:48 PM
28. ### Variance sum law proof

Hey guys, I was wondering if something could get me started on a proof for the variance sum law. For the sake of clarification, I'm referring...

• Replies: 10
• Views: 11,222
03-17-2012, 10:10 PM
29. ### Binary logistic regression with no significant predictors

Hi everyone, I have a question for logistic regression but i guess it applies to all kinds of regression analysis. I have a model with many...

• Replies: 3
• Views: 11,129
05-19-2012, 06:43 AM
30. ### Analyzing Likert scale

Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

• Replies: 4
• Views: 11,019
05-01-2011, 07:56 AM
31. ### Which test for manipulation check?

In my research, 6 different scenarios were randomly assigned to the participants. The scenarios consisted of 2, 4 of 6 items and if these items were...

• Replies: 2
• Views: 10,796
08-31-2012, 02:25 AM
32. ### Plus-4 Method

Can anyone explain the reasoning behind why the "Plus-4" Method is more reliable? Or, can anyone point me to a resource that explains why? This is...

• Replies: 0
• Views: 10,759
07-25-2008, 08:59 AM
33. ### Categorical vs Ordinal data analysis

I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

• Replies: 3
• Views: 10,708
04-22-2012, 12:41 PM
34. ### Cronbach's alpha and Cohen's Kappa (CA & CK)

Is there any effective difference between CA and a weighted-CK? Anyone any thoughts?

• Replies: 2
• Views: 10,615
11-15-2015, 04:32 PM
35. ### Multiple comparisons after Kruskal-Wallis

Hello everyone, I have been looking for differences in attitude (dependent variable, continuous) between >2 unmatched samples (independent...

• Replies: 1
• Views: 10,578
07-30-2013, 10:39 AM

Hi, I'm new to the forum, and worried that I have screwed up my thesis project. I thought I designed a standard one group pretest/postest design. ...

• Replies: 1
• Views: 10,345
08-27-2008, 03:34 PM
37. ### Non normal likert scale Data?

Hello all, I have a problem with stats procedures for a research paper. I have a sample size of 379 respondents with data collected with a 5...

• Replies: 5
• Views: 10,313
Laf
11-12-2012, 04:03 AM
38. ### Difference in coefficients between regressions?

Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

• Replies: 1
• Views: 10,271
03-25-2009, 11:55 PM
39. ### Sample size calculations for randomized controlled clinical trial

Looking for a proper sample size formula for a randomized, double-blind, placebo-controlled clinical trial. There will be three arms for the trial (2...

• Replies: 2
• Views: 10,234
01-31-2012, 07:02 AM
40. ### Partial Correlation when one variable and the control are two-level ordinal variables

I have one numerical variable and another two-level ordinal variable(e.g., one level is 27 and the other 51). I could classify it as a dichotomous or...

• Replies: 9
• Views: 10,215
02-26-2013, 05:40 PM
41. ### Correlation between two dependent variables on repeated measures

Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

• Replies: 2
• Views: 10,124
05-02-2012, 06:13 AM
42. ### Tricky running mean and standard deviation problem

Hi, I have a pretty tricky problem that I can't seem to solve. The basic problem can be expressed as follows: - I have a stream of data (in my...

• Replies: 8
• Views: 10,036
01-13-2009, 06:00 PM
43. ### Zero Inflated LOGISTIC Regression?

Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

• Replies: 2
• Views: 10,032
12-19-2012, 09:09 AM
44. ### Contradictory Results re. Normality Tests

Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

• Replies: 15
• Views: 9,943
06-13-2011, 03:43 PM
45. ### test whether 2 mean scores are significantly different

I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

• Replies: 9
• Views: 9,899
06-22-2011, 03:09 PM
46. ### How to model time-dependent covariate in random effect model?

I am using a random effect model to examine the effect of several covariates on the outcome variable over time. Some of the covariates are...

• Replies: 3
• Views: 9,790
11-14-2008, 06:37 PM
47. ### What is study population in Statistics?

this is a question that i have to answer * you have been requested to design a study to determine the prevelence of hypertention in my area. 1....

• Replies: 1
• Views: 9,781
09-20-2011, 08:50 AM
48. ### MLE of bivariate normal

how to calculate the MLEs of the 5 parameters of a bivariate normal population, the parameters being \mu_x,\mu_y,\sigma_x,\sigma_y,\rho? while...

• Replies: 3
• Views: 9,757
11-30-2010, 02:23 AM
49. ### Statistical Inference exam question

My question is why divide 4 out of 10?? and where did 4 come from? also I don't understand where 1.96 come from.

• Replies: 5
• Views: 9,718
11-14-2011, 09:37 PM
50. ### ANOVA Assumptions for Percentages

I am trying to analyze land use data (e.g. an given area is made up of 14% residential land, 36% agricultural land, and 50% forested land). So the...

• Replies: 1
• Views: 9,698
01-29-2010, 10:30 PM
51. ### Comparing 2 Likert scale with different scale numbers

One of my surveys has a Likert scale of 1-7. The other survey that I am comparing it too has a scale of 0-5. My study is a correlation study, but I...

• Replies: 0
• Views: 9,683
07-18-2008, 01:04 PM
52. ### Event Clustering in an Event Study

Dear All, I conducted an Event-Study to assess price effects. Now the result show widely fluctuating abnormal returns. Since the event-date across...

• Replies: 1
• Views: 9,637
03-09-2009, 08:41 AM
53. ### stat treatment for yes no questions

I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

• Replies: 2
• Views: 9,599
03-06-2009, 02:57 PM

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