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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: 18,695
10-11-2014, 12:02 PM
1. ### Post hoc test for the multisample median test

Hi all, I have a question about an investigation that i have developed. Specifically, i was comparing abundance of flyes among different...

• Replies: 0
• Views: 3,243
03-05-2012, 08:27 PM
2. ### Comparing within groups and across conditions

Hi, I am not sure if anyone can help me, i have undertaken a large physiological study for my post grad, it is looking at stress hormones within...

• Replies: 0
• Views: 3,241
03-14-2011, 05:35 PM
3. ### Help with Customer Satisfaction data analysis (Correlation/ANOVA)

I'm working on an analysis of a customer satisfaction survey, where I'm trying analyze the link between respondent's stated likelihood to recommend...

• Replies: 1
• Views: 3,241
11-12-2012, 09:19 AM
4. ### Latin Hypercube sampling with correlations

Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

• Replies: 0
• Views: 3,236
07-07-2010, 02:57 AM
5. ### 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: 3,229
09-25-2010, 07:31 PM
6. ### [ASK] [Quantification Theory Type I] Kansei Engineering Reference

Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

• Replies: 1
• Views: 3,228
03-11-2015, 05:17 PM
7. ### Help with t-test data analysis

Hi everyone, I am a bit lost when it comes to stats, having only had a tiny amount of it so far. In my biology class we are writing a paper on if...

• Replies: 3
• Views: 3,226
04-05-2011, 05:19 AM
8. ### Paired t-test?

Hello, I have been working with higher level statistics for so long that I have started to forget rudimentary techniques... I have a sample of...

• Replies: 5
• Views: 3,226
10-03-2011, 04:32 PM
9. ### Median or Mean vs Data distribution

Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

• Replies: 3
• Views: 3,225
12-26-2016, 09:50 AM
10. ### FDR or FWER with DIFFERENT tests

hello everyone, My question is about correcting p-values for multiple testing, either through False Discovery Rate or FamilyWise Error Rate...

• Replies: 1
• Views: 3,224
05-08-2013, 02:24 AM
11. ### S.t.d Calculation of different populations

Hello. I have n different populations with their means and their standard deviations. All these different populations follow the Gaussian...

• Replies: 5
• Views: 3,222
05-18-2010, 08:36 AM
12. ### crosstabs -

I have a crosstabs with two categorical variables. 6 columns x 4 rows. Data are proportions, not means. Basic chi-square shows me that the...

• Replies: 0
• Views: 3,222
04-05-2011, 03:52 PM
13. ### OLS assumptions after estimating robust standard errors

Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

• Replies: 1
• Views: 3,220
05-01-2009, 12:43 AM
14. ### Multiple Imputation of Pre-Composite Scores

I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

• Replies: 4
• Views: 3,220
03-02-2012, 06:33 PM
15. ### Random sample - how to get one?

Hi, I’m doing a research on job satisfaction in lawyers and I would like to use a random sample. My question is: how can I do this? In the whole...

• Replies: 5
• Views: 3,218
06-18-2011, 09:03 AM
16. ### Analysis of Categorical Data

Hello friends, I'am doing intermediate statistics for second year and I'am having some issues with this chapter. My professor told...

• Replies: 0
• Views: 3,215
03-06-2011, 04:44 PM
17. ### How to prove the UMVUE under these conditions

Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

• Replies: 3
• Views: 3,211
04-06-2010, 12:00 PM
18. ### Customer satisfaction survey (data analysis)

Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

• Replies: 5
• Views: 3,209
11-28-2012, 02:13 AM
19. ### What should i do after factor analysis output ?

Hello, I am having a construct name trust that includes the following constructs: 1 - Benevolence ( 3 Items) 2 - Integrity ( 6 Items ) 3 -...

• Replies: 3
• Views: 3,204
11-20-2014, 09:10 PM
20. ### Difficult forecasting/ density estimation problem in an experimental setting

Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given player’s...

• Replies: 4
• Views: 3,203
07-05-2011, 12:27 PM
21. ### Time Series

Hi everyone, I've been reading some papers that talk about fractality (hurst exponent) in physiological time series (ekg, eeg, gait, etc.). I was...

• Replies: 0
• Views: 3,202
11-23-2009, 03:32 AM
22. ### How robust is ANOVA's F-statistic?

Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

• Replies: 3
• Views: 3,202
06-29-2012, 01:48 PM
23. ### 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: 3,193
06-27-2013, 03:41 PM
24. ### Correlation/Regression using Aggregrated Data

Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

• Replies: 0
• Views: 3,192
10-30-2008, 07:44 AM
25. ### 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: 3,192
12-25-2013, 04:01 AM
26. ### Help needed urgently - dichotomous question

Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

• Replies: 5
• Views: 3,184
07-28-2011, 07:54 AM
27. ### sum of truncated Normal Variables

Hello all, I am trying to find if there exists a closed solution for the following: X~N(u,var) {normal dist) Y~N((u,var)|Y>a) {truncated normal...

• Replies: 0
• Views: 3,182
08-21-2012, 03:23 AM
28. ### Question about parametric and nonparametric tests and non-probability sampling

I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have...

• Replies: 3
• Views: 3,182
11-03-2016, 04:56 PM
29. ### Where do I start?

Hi! I'm feeling overwhelmed here and don't know where to start. It is the second message regarding my project and any additional help would be...

• Replies: 1
• Views: 3,177
01-21-2009, 09:40 AM
30. ### Grade (A, A-, B+, B, B-....)

Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

• Replies: 2
• Views: 3,177
04-11-2011, 06:32 AM
31. ### correlation coefficient

Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

• Replies: 5
• Views: 3,170
02-14-2012, 01:15 AM
32. ### Permanova design for BACI study (using Primer)

my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

• Replies: 5
• Views: 3,165
08-09-2013, 03:51 AM
33. ### Normality analysis

hye guys... i need a help.. Can someone show me how to run the normality analysis... In my questionnaires, I have 4 independent variables and...

• Replies: 7
• Views: 3,158
02-09-2011, 06:58 PM
34. ### How do I use PERMANOVA/interpret the results

I am doing this research project comparing the snail community across two species of sea grass. Ten sample quadrats were collected from each sea...

• Replies: 1
• Views: 3,155
10-24-2015, 07:52 AM

I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

• Replies: 8
• Views: 3,154
05-02-2014, 05:10 PM
36. ### Help need on 'Panel Corrected Standard Errors' in SAS

I have panel regression to estimate with time fixed effects and correcting standard errors using 'Panel Corrected Standard Errors', where PCSE...

• Replies: 0
• Views: 3,152
01-24-2012, 02:25 PM
37. ### Need guidance in determining how to analyze my data

Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

• Replies: 1
• Views: 3,149
10-25-2011, 03:44 PM
38. ### How to Analyze this data?

OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

• Replies: 7
• Views: 3,148
10-05-2011, 11:38 AM
39. ### Probability Density Function needed

I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

• Replies: 1
• Views: 3,146
06-01-2010, 09:10 AM
40. ### What kind of tests i can do to see if two diseases are related

I am using data from this website (data is at the bottom of the page) for a case-study. For the sake of question lets stick to any of FluWatch sheet...

• Replies: 5
• Views: 3,145
11-22-2016, 02:02 PM
41. ### Factor Analysis Transformations: Thesis Help Needed Please!

Hi I'm really hoping that someone will be able to help me? I am currently in the process of running a factor analysis. The individual items...

• Replies: 1
• Views: 3,141
08-20-2008, 04:06 PM
42. ### Bayesian Logistic Regression

I have the following logistic regression problem I am trying to solve using bayesian approach. " We consider a logistic regression setting where...

• Replies: 0
• Views: 3,141
10-13-2008, 03:09 PM
43. ### Testing Accuracy of Tridiagonal Matrix Computation

So I implemented a lanczos algorithm which tridiagonalizes a real symmetric matrix. However, I don't know if my result is accurate. How would I be...

• Replies: 0
• Views: 3,140
07-09-2008, 09:53 AM
44. ### Polynomial interaction in a mixed-design ANOVA

My analysis includes a between-group factors (condition ) and several within-subjects continuous factors (cholesterol, glucose, mass). The...

• Replies: 0
• Views: 3,140
07-13-2011, 07:03 PM
45. ### 1 way Anova vs Two Way Anova -HELP needed

I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

• Replies: 2
• Views: 3,135
01-05-2017, 09:06 AM
46. ### 2x2 Repeated Measures ANOVA

Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

• Replies: 4
• Views: 3,134
10-26-2012, 09:02 AM
47. ### Dickey Fuller Test

I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

• Replies: 1
• Views: 3,133
11-25-2011, 01:49 AM
48. ### 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: 3,133
01-29-2013, 03:18 PM
49. ### Isotonic Regression

Hello, I would like to ask if someone knows the answers to the next questions: 1. When do I use Isotonic Regression and why ? 2. What's the...

• Replies: 0
• Views: 3,130
03-20-2009, 04:19 PM
50. ### which statistic analysis-percentage frequency data-protocol analysis

I have done a research with designers. I collect the data from every one separately through protocol analysis. I want to find the association...

• Replies: 0
• Views: 3,129
11-30-2016, 11:35 AM
51. ### Sample Size Help for Observation Study

I wanted to calculate sample size for a single group, observational study. I'll be using a questionnaire to predict outcome (i.e. score on another...

• Replies: 4
• Views: 3,127
12-16-2016, 10:29 AM
52. ### Chi Square - confused which variables to use.

Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

• Replies: 4
• Views: 3,123
11-14-2011, 08:38 AM
53. ### Effect size for small non-parametric data

Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

• Replies: 5
• Views: 3,117
06-30-2014, 06:25 PM
54. ### How to test data if it is normal distribution in spss ?

Hello Good morning guys i will need some help truly i have variables in spss most of them scale type, some of them are nominal, and few are...

• Replies: 6
• Views: 3,115
11-18-2014, 03:01 AM
55. ### Help with quick but major statistical school project!

only two questions, wont take long... would really apprechiate some replys The pool can be found here: http://www.misterpoll.com/polls/515408 ...

• Replies: 0
• Views: 3,114
02-04-2011, 03:05 PM
56. ### Could anyone recommend an interactive application for mass data analysis?

Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

• Replies: 13
• Views: 3,109
05-31-2012, 09:25 PM
57. ### presenting results of simple correlations and multiple regressions in the same paper

I recently got comments back from a reviewer on a manuscript, criticizing my use of simple correlation and multiple regression analyses to study the...

• Replies: 2
• Views: 3,108
05-04-2012, 07:55 AM
58. ### The joint normality of the two estimates for linear regression model

I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

• Replies: 13
• Views: 3,106
BGM
12-22-2012, 12:27 PM

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