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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: 19,435
10-11-2014, 12:02 PM
1. ### How to measure 1.5 σ after regression.

I am new at Stats, i request for some hints/answer to better understand the concept of calculating the second equation. BACKGROUND: I have...

• Replies: 0
• Views: 217,567
04-08-2011, 08:17 AM
2. ### Limit of standard normal CDF(x) as x goes to ∞?

Let N:\mathbb{R} \to be the CDF of the standard normal density function. I want to evaluate: \lim_{b\to 0^+} N(\frac{a}{b}). Clearly this is...

• Replies: 12
• Views: 97,217
10-18-2012, 09:39 AM
3. ### Suggest an Unbiased estimator for θ

Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

• Replies: 3
• Views: 93,671
BGM
08-19-2010, 03:49 AM
4. ### Panel Data - Pooled OLS vs Fixed Effects vs Random Effects

Hi forummers, I am a finance PhD student and am currently undertaking some statistical analysis of bankruptcy risk. I have data on roughly 500...

• Replies: 2
• Views: 80,552
03-09-2012, 01:54 PM
5. ### One Sample T-Test with Likert Scale Questionnaire

Hi all, I am doing a research and will study the how user think about shopping online. In my questionnaire, I have 3 questions - using Likert...

• Replies: 8
• Views: 68,328
12-17-2016, 02:18 AM
6. ### Sum of the residuals

Hi, My question may sound trivial but here it goes: When doing a sample regression by the ordinary least squares method, does the sum (nonsquared!...

• Replies: 2
• Views: 52,325
02-04-2011, 01:40 PM
7. ### Mass significance – information criterion

In search for the ’best’ linear regression model with 10 potential predictors I calculated the Schwarz Bayesian Criterion (SBC) for every possible...

• Replies: 0
• Views: 50,447
03-13-2012, 04:25 AM
8. ### Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first...

• Replies: 0
• Views: 49,841
01-31-2012, 01:11 PM
9. ### Converting eta squared to Cohen's d

I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set. Is it possible...

• Replies: 5
• Views: 46,800
03-03-2011, 09:11 PM
10. ### Generating Skewed Normal Distributions

I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

• Replies: 17
• Views: 43,839
06-03-2016, 10:10 PM
11. ### Correlations between groups of Likert-type answers – choice of statistical test

I'm looking for the optimal way to interpret some data, so any constructive advice will be appreciated. A questionnaire with 3 groups of 50...

• Replies: 1
• Views: 41,576
05-31-2012, 05:02 PM
12. ### help in Real survey data analysis‏

would you please guide me to analyze it? i will tell u overall view of the questionnaire and goals and hope to help me how to analyze it the...

• Replies: 2
• Views: 41,164
05-19-2012, 03:47 PM
13. ### Sturges' Formula

How can I prove Sturges' formula for determining number of classes in frequency distribution? k=Log2n+1 (n=number of data, k=number of classes)

• Replies: 5
• Views: 32,535
09-27-2013, 12:01 PM
14. ### Pairwise comparisons

If anyone has ANY idea at all i would be most appreciative My lab report includes pairwise comparisons, I have the SPSS output before me but I...

• Replies: 2
• Views: 30,402
06-15-2009, 08:05 PM
15. ### Choosing Kruskal–Wallis test for group comparison with unequal sizes

I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

• Replies: 2
• Views: 28,248
10-31-2012, 08:10 PM
16. ### Cramer's V effect size based on df

I saw a presentation about chi-square testing and correlations. Specifically calculating effect size for Cramer's V results. The puzzling thing was...

• Replies: 10
• Views: 28,012
10-15-2011, 12:41 PM
17. ### Slovin’s Formula in Excel (Calculating Survey Sample Size)

Hello All, If anyone can help me with an formular that has had me somewhat stumped for the last few weeks now, I would be eternally grateful ! I...

• Replies: 0
• Views: 27,372
07-21-2013, 09:04 AM
18. ### Non-parametric equivalent of a factorial anova (not repeated measures)?

Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

• Replies: 16
• Views: 27,212
12-03-2011, 03:52 PM
19. ### comparing means\unequal(small) size group

Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

• Replies: 4
• Views: 27,013
08-18-2009, 12:00 AM
20. ### level of significance 0.1%

Hi! Would it be OK to use a level of significance of 0.1 -instead of traditional 0.05- when using non-parametric tests in bivariate analyses if...

• Replies: 9
• Views: 26,296
07-23-2013, 02:55 AM
21. ### Inclusion criteria of participants and internval validity

Hi All, I am having trouble understanding how the inclusion criteria of participants can affect the internal validity of a study. This is my...

• Replies: 1
• Views: 26,290
05-02-2012, 07:15 AM
22. ### Centering for interactions in multiple regression ??

This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

• Replies: 5
• Views: 26,235
12-01-2008, 06:50 PM
23. ### Bonferroni Correction Factor !!!

Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

• Replies: 9
• Views: 26,211
07-14-2009, 06:33 AM
24. ### Inter-observer variability

Dear all, I hope so much anyone here may help me with my question regarding inter-observer variability: 3 observers measure the diameter of...

• Replies: 13
• Views: 24,204
07-02-2011, 06:36 PM
25. ### Roy's largest root VS all the other ones...

does anybody know why the statistical significance of Roy's largest root does not imply the statistical significance of the other three popular...

• Replies: 5
• Views: 23,940
04-04-2011, 07:08 AM
26. ### Small sample size, correlation

Ok, I am helping someone to run spss on his data,He just wants to know the results and not advice.But still I am hating my gut because his method...

• Replies: 13
• Views: 23,836
10-11-2010, 02:31 PM
27. ### finding the standard deviation and mean from frequency table

I have a frequency table showing age distribition in Auckland supercity election 2010 and I have in the coloumns I have Age, frequency, percentage,...

• Replies: 21
• Views: 21,532
11-12-2011, 03:41 AM
28. ### Uninformative gamma prior for Poisson distribution

Hi! I want to use Poisson distribution in my research to model some waiting times and I want to set the gamma prior to its parameter. I want the...

• Replies: 7
• Views: 21,280
01-17-2011, 03:16 AM
29. ### logistic regression : intercept is NOT significative

Hi everybody I have performed a logistic regression with a stepwise selection. But, at the end, the parameter estimate of intercept is NOT...

• Replies: 5
• Views: 20,912
05-03-2009, 07:26 AM
30. ### ¿Weighted moments references?

Hi, I have a sample of frequencies and Sums(totals): Ni Si 23 12345 10 7800 ... Si is the sum over some variable X, measured...

• Replies: 0
• Views: 20,631
04-14-2013, 06:56 AM
31. ### discriminant linear analysis, coefficient interpretation

Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

• Replies: 2
• Views: 20,605
03-19-2013, 02:47 PM
32. ### Interpreting the "Rotated component matrix" in Varimax Factor Analysis

So I did Varimax factor analysis for 21 questions in order to group them. As per my understanding the rotated component matrix places each question...

• Replies: 4
• Views: 20,604
06-07-2013, 05:14 PM

Hi!, :wave: I want to use Adonis in R (non-parametric permutation MANOVA) to test for relationships between bray-curtis distances (dissimilarities I...

• Replies: 5
• Views: 20,464
02-01-2011, 04:52 AM
34. ### determening normality in repeated measures ANOVA

Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

• Replies: 6
• Views: 20,386
07-19-2011, 05:11 AM
35. ### Regression Equation

Hi there, Could someone please tell me which values do the following symbols represent in the regression equation: ∆R2 (R Square Change?) ∆F (F...

• Replies: 2
• Views: 19,864
08-10-2008, 08:16 PM
36. ### Can I use a chi-square test for this 2x3 contingency table?

Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

• Replies: 1
• Views: 19,683
07-26-2012, 09:30 PM
37. ### Is there a minimum number of subjects required for a t-test?

Hi everyone, I am carrying out a piece of research on the effects of heel pain on the way we walk. I have two groups, 8 in the heel pain group...

• Replies: 2
• Views: 19,476
05-08-2009, 03:43 AM
38. ### T-Test vs. Mann-Whitney U Test for ordinal data

• Replies: 5
• Views: 19,454
08-21-2013, 05:29 AM
39. ### linear mixed model in SPSS - how?

Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

• Replies: 2
• Views: 19,324
02-25-2011, 02:56 PM
40. ### Normal? Bimodal normal? Some other distribution?

Hello! I am a newbie here. First I want to say HI to everyone! :) And I do have a question here. I am trying to model my data that ideally is...

• Replies: 4
• Views: 19,285
01-28-2009, 08:31 AM
41. ### matched pairs VS complete randomization - correspondence test housing market

I work in experimental economics, labor and housing market. I am trying to answer the following question: why do researchers use matched pairs of...

• Replies: 0
• Views: 19,038
03-08-2014, 09:32 AM
42. ### ANOVA vs. T-Test --> completely different results

If I compare three treatment groups with ANOVA (and Bonferroni posttesting), I get no significant difference results between groups (p>0.05)......

• Replies: 7
• Views: 18,773
06-14-2011, 12:14 AM
43. ### population normally distributed, sample not, parametric test allowesd?

Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

• Replies: 8
• Views: 18,560
02-19-2011, 07:26 PM
44. ### Certain sample size needed for HLM?

I have a data set of test scores and memory scores of 111 students, nested in 12 different classroom. 6 classrooms are from high income areas and 6...

• Replies: 3
• Views: 17,978
11-04-2009, 10:14 AM
45. ### Expected Value of a Sample Range

The function for the expected value of a sample range is given on the following page. http://www.jmu.edu/docs/sasdoc/sashtml/qc/chapc/sect9.htm ...

• Replies: 7
• Views: 17,959
10-16-2008, 07:34 PM
46. ### Understanding ANOVA requirements better.

Two ANOVA requirements are 1. Approximately Normal Data 2. Equal Variances Online the normality requirement is often simply stated as the...

• Replies: 2
• Views: 17,815
04-17-2011, 07:04 PM
47. ### Likert Scale

Hi! Can you help me with my stat research problem? what is the difference between 3-point likert and 5-point likert scale? which is better to use and...

• Replies: 6
• Views: 17,747
03-08-2012, 05:37 AM
48. ### Multiple Group Analysis necessary?

Hi, for my master's thesis I collected data with an online survey, measuring consumer behaviour. I used two samples, one group from Australia and...

• Replies: 13
• Views: 16,759
06-22-2012, 03:05 PM
49. ### Low Cronbach alpha on recognised instrument

Hi, I am using a standard survey instrument that during a meta analysis over 15 years has shown a relability of 0.73 for a particular facet. I...

• Replies: 18
• Views: 16,670
03-13-2013, 07:08 AM
50. ### Websites on designing scientific posters

I have to do a poster presentation in a few weeks and I'm looking for some good sites that might give some advice on designing scientific posters,...

• Replies: 5
• Views: 16,551
05-11-2010, 02:08 AM
51. ### Mean centering (good bad or ugly?)

As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

• Replies: 8
• Views: 16,506
10-16-2011, 12:45 PM
52. ### chi-square post-hoc tests?

Hi there, I've been searching the forum and elsewhere to figure out how to interpret my chi-square results and I can't find anything that relates to...

• Replies: 4
• Views: 16,111
04-16-2011, 02:54 PM
53. ### Survey Question with 4 Point Likert Scale and Yes/No Question

Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type...

• Replies: 4
• Views: 15,801
12-10-2012, 01:39 PM
54. ### 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: 15,763
10-04-2010, 06:41 PM
55. ### Interpretation of Granger Causality test

Hi All, I am using granger causality test on two variable A and B (Both becomes stationary after taking first lag) in eviews. I used both the...

• Replies: 0
• Views: 15,539
04-10-2011, 05:28 AM
56. ### What statistical test should I use to check to ratio?

I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

• Replies: 6
• Views: 15,511
02-16-2011, 01:37 PM
57. ### 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: 15,454
10-07-2010, 08:03 PM

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