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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: 18,765
10-11-2014, 12:02 PM
1. ### Testing Research Hypothesis

Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

• Replies: 4
• Views: 2,815
11-15-2011, 08:59 AM
2. ### Standard Deviation of non-numerical data

I am trying to determine the standard deviation data that is not itself numerical, but its count is. For example, If I have a dataset from a survey...

• Replies: 0
• Views: 2,626
03-05-2015, 03:51 PM
3. ### Significance of Correspondence Analysis clusterings

Dear All, I would like to ask you about Correspondence Analysis. I am wondering if does any strategy exist to test the significance of the...

• Replies: 4
• Views: 4,619
01-03-2010, 02:27 AM
4. ### when Bootstrap Correlation coefficient (Pearson) con be used?

Hi! Though I know the mechanics of the bootstrap methods, I am do not manage to find in literature a clear-cut explanation about when and in what...

• Replies: 0
• Views: 4,111
10-26-2010, 06:19 AM
5. ### measure of effect size for categorical association

Hello, I am having difficulties in wrapping my head around an issue regarding chi-squared statistic, Cramer's V, and Cohen's measure of effect...

• Replies: 1
• Views: 2,767
11-03-2016, 08:20 AM
6. ### A question regarding correlation and regression for a seminar

Hello, Im doing a seminar in which the dependent variable is work centrality which is an interval one. the independent variable is age (ratio),...

• Replies: 1
• Views: 3,200
12-25-2013, 04:01 AM
7. ### Estimating overall output of multiple independent inputs - engineering project

Hi all I am conducting a final-year university engineering research project. The aim is to build a model (in the form of single implicit...

• Replies: 0
• Views: 1,362
09-27-2011, 07:25 AM
8. ### What is the opposite of partial differentiation?

Hi all This is in context with my earlier post (28/09) on Rearward Amplification, but it does not necessarily need to be read. I have had a...

• Replies: 0
• Views: 4,201
10-09-2011, 07:58 AM
9. ### How to compare standard deviation?

Hi, I have several sets of data that are rather different in their absolute numerical range. Some datasets stretches between 20-40, and others...

• Replies: 1
• Views: 1,686
05-12-2013, 12:15 PM
10. ### Compare type of procedure with an outcome - which analysis is best?

Good morning, I'm writing a medical meta-analysis, and I need help with a part of the statistical analysis. I gathered articles from various...

• Replies: 0
• Views: 1,640
11-05-2014, 08:55 AM
11. ### school project

Hello, I am doing a project for school and am in need of some advice. I want to do something to do with the gubernatorial primary election in NJ...

• Replies: 0
• Views: 2,008
05-30-2009, 09:33 PM
12. ### Can anyone help please?

Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

• Replies: 3
• Views: 1,721
05-12-2011, 10:59 AM
13. ### Negative Cronbach !

Can anyone help me, I am having a negative cronbach value.. Does it mean my data is unreliable? I have a set of 10 questions with likert scale...

• Replies: 2
• Views: 2,230
05-09-2011, 05:03 PM
14. ### HLM Graphics

Hi Guys, i am working with hlm 7 and a 3-level-Model. I analyse if Extraversion is a Moderator between Event Leader/employe (for example positive...

• Replies: 0
• Views: 1,222
06-13-2015, 09:32 AM
15. ### Meta-Regression

Hi! I just want to ask if there are people familiar with Meta-Regression/Meta-Regression Analyses (MRA). I'm planning to have it as an Undergraduate...

• Replies: 0
• Views: 1,137
09-14-2013, 05:06 AM
16. ### General inverse variance method

Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know...

• Replies: 1
• Views: 1,321
01-25-2016, 08:55 AM
17. ### Interpreting Kruskal-Wallis results

Hi all, I've just finished my undergrad thesis and the reviewers strongly recommended that I pursue formal publication of my results. I thought...

• Replies: 10
• Views: 4,581
08-03-2014, 04:53 PM
18. ### Correlation significance critical values

I've been trying to determine the critical value for a sample size of 168 but all the tables only indicate values up to 100 (most of them). Is there...

• Replies: 1
• Views: 1,323
01-15-2015, 08:41 AM
19. ### Composite Hypothesis Testing Problem

Hello guys, So I have this problem I am trying to solve and its

• Replies: 0
• Views: 961
05-10-2015, 04:48 PM
20. ### Individual score to group mean comparison! Which test?

Hello guys! I studied a lot of statistics during my psychology degree and masters in 2000-04 but I got very rusty since then! I tried to brush up...

• Replies: 2
• Views: 3,998
07-10-2014, 05:10 AM
21. ### reporting statistical results

I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

• Replies: 2
• Views: 4,094
02-09-2009, 10:12 AM
22. ### two probability levels in regression tables

I was wondering if is is common practice to identify betas that are significant at either the .05 and .001 level. e.g., If I decide to set my p level...

• Replies: 1
• Views: 3,000
06-24-2009, 01:24 AM
23. ### What N to record for regression table?

Is it the outcome variable (dependent variable) N that I report in a regression table?

• Replies: 0
• Views: 1,915
08-20-2009, 07:08 PM
24. ### p =.046 significant?

If I get a probability value of .046 is this considered significant given significance level of .05?

• Replies: 5
• Views: 8,038
09-02-2009, 10:46 AM
25. ### 2 Sample T Test for Nonnormal data

Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

• Replies: 10
• Views: 2,707
04-09-2013, 07:13 PM
26. ### How to predict the uncertain parameter

Hi, I am trying to predict the value of a parameter(Y) with varying frequency(X2) and X1(stall parameter). Y X1 ...

• Replies: 1
• Views: 1,500
11-07-2013, 09:56 PM
27. ### HLM Sample size and Equality of Groups

Hi, I have 3 data points (Fall, Winter, Spring) regarding the oral reading fluency of 2 groups of children collected over a school year....

• Replies: 0
• Views: 3,253
09-25-2010, 07:31 PM
28. ### doctoral research

I would like help with posting and or and analylzing the results of mail surveys on collaboration onto SPSS.

• Replies: 3
• Views: 2,584
11-10-2008, 02:13 AM
29. ### Data Collection

I am an education major and am lost in my research class! I have the research question of, "How does classical music playing in the background...

• Replies: 1
• Views: 1,297
03-15-2017, 07:28 AM
30. ### non-parametric equivalent for mixed-factorial design

I have to analyze my confidence data which is measured using a likert scale (1 – 7). Because it’s ordinal in nature, I need to use non-parametric...

• Replies: 2
• Views: 3,643
04-27-2011, 11:13 PM
31. ### Conditional distribution for covariance matrix with constraint

Hi, I'm trying to work out how to draw from the conditional distribution for a covariance matrix given some correlated multivariate Gaussian data....

• Replies: 2
• Views: 1,643
08-12-2014, 11:16 AM
32. ### A power analysis question - am I making a big mistake?

Help! It's a very long time since I have had to tackle Power Analysis but I have recently been handed a couple of problems, one of which I hope...

• Replies: 0
• Views: 2,242
01-01-2010, 05:36 PM
33. ### Choosing a proper statistical test

Hi! I want to perform a statistical test, but I'm not sure which one I should use. Please note that this is a hypothetical example so I will not...

• Replies: 1
• Views: 1,506
04-26-2012, 03:22 PM
34. ### Reading Research - ANCOVA?

I have a class (n=30).Using a variety of test I split them into stronger readers - SR (16), weaker readers WR (14) - Quasi-experimental I chose a...

• Replies: 0
• Views: 2,919
12-29-2009, 09:05 AM
35. ### Several nested categorical ecological variables, appropriate test?

Hi all, this is my first post. I've looked through the FAQ and links to selecting a test, but haven't found an example of a test similar to my own. ...

• Replies: 0
• Views: 1,543
08-12-2012, 09:54 AM
36. ### A question regarding Cronbach's Alpha

Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

• Replies: 2
• Views: 2,462
01-24-2015, 03:18 PM
37. ### standardize by population density

I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

• Replies: 0
• Views: 597
04-11-2016, 09:57 AM
38. ### Unweighted population vs weighted population

Hi everyone, I have a dilemma of trying to find how to best read a data. Here is a sample of my data, the question is how frequent do you buy a...

• Replies: 2
• Views: 3,402
10-10-2013, 09:56 PM
39. ### Student's T-test versus one-way ANOVA

I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

• Replies: 1
• Views: 3,065
04-06-2014, 09:45 AM
40. ### Minimum Sample Size for a Survey

Hi guys, Here's a question I've been struggling with over the past week. My employer would like to perform a survey to gauge public opinion on a...

• Replies: 3
• Views: 2,686
08-11-2011, 02:21 PM
41. ### Repeated measures design question

Hi all, It's been a while since I've been involved with statistics and was hoping to be pointed in the right direction. I have a data set...

• Replies: 0
• Views: 1,248
08-19-2014, 01:59 PM
42. ### Literature on convergence of Bregman divergences

Hi, as the title indicates, I am looking for some literature related to convergence properties of Bregman divergences. Generally speaking, I am...

• Replies: 2
• Views: 1,225
03-24-2014, 05:28 AM
43. ### Stratification criteria mess up the use of a random factor?

Hi! In my study on kelp I want to see how wave exposure and current (both continuous variables) affect kelp physical measures along the Norwegian...

• Replies: 0
• Views: 1,517
12-08-2011, 08:24 AM
44. ### Crossover design or Randomised Block Design?

I have two groups of rats (group A and group B). 'Pretreated' means they were injected beforehand (with either memantine or saline). They were then...

• Replies: 2
• Views: 1,489
12-22-2013, 07:15 PM
45. ### What statistical test should I use for this data?

Two groups (group A; group B) are given two treatments (M) and (B), and a control (Control) in different orders. Then the weight of food they consume...

• Replies: 1
• Views: 1,750
12-30-2013, 10:46 AM
46. ### Help for Statistical Analysis for our project (using Statistical Estimation)

Good day. I would like to ask for your help for our statistical analysis of our project. Our project is an alarm clock that is modified in a way that...

• Replies: 1
• Views: 928
02-25-2014, 08:23 AM
47. ### NLP Algorithm Evaluation: Help?

Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

• Replies: 0
• Views: 2,917
06-28-2010, 03:01 PM
48. ### Testing the inter-rater reliability when data doesn't have a normal distribution

Hello guys! What is a standard way of testing the inter-rater reliability when data doesn't have a normal distribution? I had a bunch of raters...

• Replies: 0
• Views: 3,537
12-08-2010, 10:42 PM
49. ### How to describe difference of sorting sequence of values between two groups?

I have 6 variables (A,B,C,D,E,F) in two groups named X and Y. The sorting sequence of the values of the 6 variables between the two groups is...

• Replies: 0
• Views: 1,714
03-31-2014, 09:21 AM
50. ### Permutations w/ constraints question

Hello Everyone! I apologize, in advance, if I'm posting this query in the wrong thread... My query: Given a transpose 5-d vector, {d_1, d_2,...

• Replies: 0
• Views: 1,070
02-05-2014, 09:30 AM
51. ### HI what does the alpha sign mean?

it says, such and such variable (6 items, "alpha sign" = .88) is a measure of .......

• Replies: 0
• Views: 1,957
10-06-2011, 01:48 AM
52. ### Do you know how you can solve this

I want to plot a graph of the mean of two groups in the experiment. They have different mean, different standard deviation. The interval bars that...

• Replies: 0
• Views: 1,801
10-07-2011, 05:22 PM

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