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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: 18,712
10-11-2014, 12:02 PM
1. ### Compute a new variable or is there a better way to do this?

First post, thanks in advance for advice. I would like to examine three variables, with the expectation that: When a subject scores HIGH on...

• Replies: 2
• Views: 1,605
03-26-2013, 04:07 PM
2. ### Basic Statistics Question

I have a distribution and the numbers are spread around all over the place. For one sample of data it looks like left skewed and for other right...

• Replies: 2
• Views: 2,389
sak
10-08-2012, 08:29 PM
3. ### Bayesian vs. Frequentist for the applied researcher

There's been a lot of talk about Bayes lately in my life, talkstats, class, articles etc. I feel like it's becoming something researchers can't hide...

• Replies: 2
• Views: 1,780
11-26-2012, 07:30 PM
4. ### Underestimation of test scores due to item size

Hello all, I've just been playing with the following idea, and I don't really have anyone else to talk about this kind of thing with. Anyway, I...

• Replies: 2
• Views: 1,610
10-02-2012, 02:15 PM
5. ### Revised Inventory Reliability and Validity

I sent a current inventory survey to 1500 people. They were given the option of evaluating each inventory item with a "retain" "revise" or "remove"...

• Replies: 2
• Views: 1,423
10-05-2012, 10:41 AM
6. ### Appropriateness of logistic regression

Hello, I am interested in the effects of gender on a set of variables. I have run a number of group mean t tests (with gender as the group...

• Replies: 2
• Views: 2,252
10-24-2012, 08:04 AM
7. ### 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: 28,063
10-31-2012, 08:10 PM
8. ### mixture of normals inequality

Let C be a convex and compact set in R^n, and let T = {theta_1,...,theta_k} be a set of points not in C such that T and C are hyperplane separated. ...

• Replies: 2
• Views: 1,295
10-19-2012, 06:20 PM
9. ### How to create sampling weights?

Hi all, I'll go directly to the point, and then try to clarify: How do I create reliable weights for a sample, that take account of the number...

• Replies: 2
• Views: 2,578
10-23-2012, 09:21 AM
10. ### Help With The Preffered Package Type Assessment

Hello there to everyone! I have the question concerning the underlying data analysis methodology. Here is the small introduction. There is a data...

• Replies: 2
• Views: 1,389
11-15-2012, 12:45 PM
11. ### Help with real estate statistics.

I am a real estate appraiser in California. I want to conduct a study that will tell me what certain aspects of properties, like bedrooms, square...

• Replies: 2
• Views: 1,322
11-11-2012, 03:25 PM
12. ### Calculating weighted mean & SD from multiple group data

I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

• Replies: 2
• Views: 4,763
asf
11-21-2012, 07:47 PM
13. ### Sample Size - Mathematical proof

Hi, I am currently trying to find out the mathematical proof for my chosen sample size. I have referred to the table below and found out that my...

• Replies: 2
• Views: 3,107
12-21-2012, 11:53 AM
14. ### Help Calculating Significance Between 5 Elementary School Data

Hello, I am a school administrator in Oklahoma. I have five small elementary schools in my district. I often here from each of them that their...

• Replies: 2
• Views: 1,424
12-11-2012, 08:46 AM
15. ### which type of ANOVA?

N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in...

• Replies: 2
• Views: 1,827
12-19-2012, 07:35 AM
16. ### 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: 10,056
12-19-2012, 09:09 AM
17. ### What statistical test should I use?

I've recently collected data as part of my university course to answer the question 'Does social structure in captive meerkats affect behaviour and...

• Replies: 2
• Views: 1,468
05-16-2013, 08:17 AM
18. ### residual analysis where expected values are <5

Hi all, My question is: Will it be fine if we use residual analysis, (observed-expected)/sqrt(expected), to test the pattern of association...

• Replies: 2
• Views: 1,185
04-29-2013, 03:53 AM
19. ### Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

• Replies: 2
• Views: 1,909
04-18-2013, 05:20 PM
20. ### Cluster analysis - using statistiXL package for excel - how to determine a cluster

Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

• Replies: 2
• Views: 2,116
04-08-2013, 06:33 PM
21. ### Mediation Analysis

Hi All, Could any one explain for me what is the exact differences between full Mediation and partial Mediation? With some example please. Many...

• Replies: 2
• Views: 1,417
04-03-2013, 11:38 AM
22. ### Assumption of variables for Factor Analysis

Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

• Replies: 2
• Views: 1,389
01-13-2013, 03:04 PM
23. ### Which test to use please?

Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

• Replies: 2
• Views: 2,858
03-19-2013, 12:48 PM
24. ### Confusions regarding Regression, Multicollinearity and Factor Analysis

I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

• Replies: 2
• Views: 3,137
01-29-2013, 03:18 PM
25. ### MANOVA: IV with only two levels

Hi, I'm a biological science university student with an interest in teaching myself some basic inferential statistic and have been learning about...

• Replies: 2
• Views: 1,628
03-14-2013, 06:48 AM
26. ### Scientific articles about statistics

I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

• Replies: 2
• Views: 2,749
03-14-2013, 03:49 PM
27. ### Repeatability and Reproducibility

Hi, I'm new to this and I'm not exactly a math expert. I am carrying out research in a lab, and I want to test repeatability and reproducibility of...

• Replies: 2
• Views: 2,725
02-21-2013, 10:25 AM
28. ### Need help to understand which statistical test to use on my data.

Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

• Replies: 2
• Views: 2,521
04-25-2013, 03:25 PM
29. ### How to deal with a categorical response and continuous and categorical predictors?

Hi all, I have a large dataset of categorical and continuous variables, the observations are animal species. I want to test which variables are more...

• Replies: 2
• Views: 2,168
01-02-2013, 02:23 AM
30. ### Fixed and Random Effects in Mixed Modeling

Thank ahead of time for any help. I am analyzing time series data. Originally I was running Repeated Measures ANOVA and entering between subjects...

• Replies: 2
• Views: 1,955
02-01-2013, 07:40 AM
31. ### how to determine what test to use for a project?

I'm trying to determine if there is a statistical significance in hospital admission rates (asthma and bronchitis) before and after tobacco...

• Replies: 2
• Views: 1,163
03-15-2013, 02:42 PM
32. ### What is the purpose of multigroup invariance test?

Hi, I am confused about the purpose of multigroup test. According to Byrne (2008), many studies focus on multigroup comparisons, and assume two...

• Replies: 2
• Views: 1,941
03-10-2013, 08:52 PM
33. ### No idea what tests to use!

** (P) (c) (f) (s) 3A 1 0 1 0 3B 1 1 1 1 ...

• Replies: 2
• Views: 2,248
03-14-2013, 11:45 AM
34. ### 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: 19,250
03-19-2013, 02:47 PM
35. ### basic hypothesis testing

am new to the forum, and would appreciate some help. i'm studying the relationship between worker performance (x) and pay (y) i'm trying to...

• Replies: 2
• Views: 1,435
03-17-2013, 01:49 PM
36. ### Goodness of Fit Applicability

I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

• Replies: 2
• Views: 1,229
02-13-2013, 05:09 PM
37. ### Dimensionalities in Multi-Dimensional Scaling

Hello all, :wave: I'm conducting market research and want to use compositional Multi-dimensional scaling to create perceptual maps of Brand...

• Replies: 2
• Views: 1,776
03-14-2013, 12:49 AM
38. ### P-value plots

If anyone know any good paper or other resource that gives an introduction to p-value plots, I'd greatly appreciate if you could share it.

• Replies: 2
• Views: 1,560
04-25-2013, 01:51 AM

So I am comparing 2 imaging techniques and correlating their results for calculating bone mineral density in the knees. One is called DEXA which is a...

• Replies: 2
• Views: 1,199
04-17-2013, 05:13 PM
40. ### Where to send an education methods piece

I'm writing a piece that introduces a new correlation like measure between time periods. I would like to get this one published somewhere. The...

• Replies: 2
• Views: 1,164
05-18-2013, 02:20 AM
41. ### help with pilot study

My IVS: I manipulated race of a job candidate (black or white) as well as the job candidate’s SES (Low SES or High SES) I then gave a survey...

• Replies: 2
• Views: 1,343
04-10-2013, 10:20 PM
42. ### Survival Analysis

Hello i have a group of varaibles which represent 251 variables express the GPA of the student(averages) througout 41 semester...what kind of...

• Replies: 2
• Views: 2,085
03-13-2013, 02:19 PM
43. ### how to using mann kendall test?

hi everyone, i am a new member of this forum and i'm not statistician. my english is not good, sorry for language. i'm having trouble with the...

• Replies: 2
• Views: 5,674
05-20-2013, 06:14 AM
44. ### Best Statistical Test for small sample size

I am looking at changes in endotracheal tube cuff pressures pre and post subglottic suctioning. I have pre and post data for four different initial...

• Replies: 2
• Views: 1,802
06-26-2013, 09:11 AM
45. ### Quantifi the homogeneity

Hello i am hydrologe and i search to find a solution for the following problem: Suppose that i have k samples of observations (region) of the...

• Replies: 2
• Views: 1,409
05-30-2013, 09:33 AM
46. ### What approach to take for this study

Hi I need help in finding a what stat approach i need to use I have two groups a G1(disease) and control - 5 people in each group. For both...

• Replies: 2
• Views: 1,418
06-11-2013, 02:10 PM
47. ### Data request (if that is allowed) concerning university enrollment figures in the USA

Hi Everybody, I am struggling finding data that I am sure exists, so I figured I would reach out for help (if this sort of thing is not allowed...

• Replies: 2
• Views: 1,105
06-19-2013, 07:58 PM
48. ### Gamma vs. Tau's b

Hi everyone I am studying political science, and we have during our classes of statistical research learned to use gamma for ordinal variables....

• Replies: 2
• Views: 1,549
06-15-2013, 05:13 AM
49. ### Suggestions for book

Hi everyone! I am a new user of this forum. I have a degree in Mathematics and I would like to improve my knoweledge in Statistics. In particular...

• Replies: 2
• Views: 1,609
06-14-2013, 10:15 AM
50. ### sampling question

Hello, I am about to design a study to compare two measures of "civic engagement" in two nations. Unfortunately, I don't have the possibility to...

• Replies: 2
• Views: 1,166
06-22-2013, 07:51 AM
51. ### What test to use?

I'm glad I found this group. I'm currently studying on butterfly's garden preferences based on the number of butterflies caught in the area. I...

• Replies: 2
• Views: 1,144
06-20-2013, 12:04 PM
52. ### Error propagation in integral with limits uncertainties

Hallo, I have one concern that I think the community can help. I need to calculate the definite integral where the limits have their errors as...

• Replies: 2
• Views: 5,534
06-23-2013, 03:16 AM
53. ### standard error, confidence interval of relative difference?

Hi all, For a plant biology research project i am doing, I want to describe the relative difference between control and treatment. The plants...

• Replies: 2
• Views: 3,195
06-27-2013, 03:41 PM
54. ### Mann-Whitney U failed assumption?

Hi all, I hope you're able to help. I have some numbers that need crunching. I would normally use an independent-samples t test, however, as...

• Replies: 2
• Views: 948
07-24-2013, 02:50 PM
55. ### As treated vs. per protocol?

I have found articles saying the two are similar and cant make sense of it. Could anyone give me exact explanations of the two in lay terms and also...

• Replies: 2
• Views: 3,967
06-26-2013, 08:26 AM
56. ### t-test

The inpatients infection rates will be tracked from the entire inpatient population on all three adult units allowing it to be compared to the rates...

• Replies: 2
• Views: 1,299
07-19-2013, 03:56 PM

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