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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: 18,731
10-11-2014, 12:02 PM
1. ### generate data for logistic regression simple question

Hi there, If I want to see how good can I estimate the coefs in the simple linear model y=b0+b1*x+e when X follows exponential with mean 3 (or...

• Replies: 1
• Views: 4,413
08-28-2008, 03:19 PM
2. ### From OLS to Box Cox to ?

Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

• Replies: 4
• Views: 5,971
08-31-2008, 02:58 PM
3. ### Anova

Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance...

• Replies: 2
• Views: 4,785
09-02-2008, 03:38 AM
4. ### Q re Gauss-Newton Method convergence in Nonlinear Regression

I am using a Minitab implementation of the Gauss-Newton Method to approximate a nonlinear regression of a model with 6 parameters (2 are covariates)....

• Replies: 1
• Views: 2,422
09-07-2008, 08:18 PM
5. ### Meta-Analysis

Hello, I am in the process of coding a number of study results for the purpose of conducting a meta-analysis. At present i am having an issue with...

• Replies: 1
• Views: 3,553
09-09-2008, 12:24 AM
6. ### pre-test post-test difficulty

Hi everyone, I'm new to the forum, but I'm definitely glad it's here. I have a difficult research design problem / stats problem that I was...

• Replies: 1
• Views: 5,908
09-09-2008, 10:02 PM
7. ### Help in Genetic Analysis

Hy, what is the better test (or software) to compare the genotype (or allele) frequency of several gene mutations, at the same time in two...

• Replies: 0
• Views: 2,445
09-10-2008, 08:30 AM
8. ### Covariate Estimation & Unbiased Estimation

I work with a group that utilizes the Mahalanobis Distance to detect the health of a system, mostly electronics. Within this research, we are looking...

• Replies: 0
• Views: 4,000
09-10-2008, 12:41 PM
9. ### Mahalanobis Distance

I am doing research concerning the degradation of a particular system... In this case, a cooling fan for a computer. I am measuring three...

• Replies: 0
• Views: 4,497
09-11-2008, 09:42 AM
10. ### Deck of cards: Odds of being dealt 3 of a suit?

I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

• Replies: 2
• Views: 8,542
09-15-2008, 09:46 AM
11. ### Cut-off Points in Linear Discriminant Analysis

Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

• Replies: 2
• Views: 5,778
09-16-2008, 02:22 AM
12. ### Probability Theory Exam

Studying for a probability exam and here are two practice problems I can't seem to solve 1. Let P be the uniform distribution on a finite set...

• Replies: 1
• Views: 4,312
09-17-2008, 01:21 PM
13. ### simple regression question (I think)

Hi there, Suppose I have the simple libear regression model: Y=a0+a1*X+ε where ε~N(0,σ^2) Suppose that via least squares I estimate a0...

• Replies: 5
• Views: 3,829
09-24-2008, 02:35 PM
14. ### Looking for a better answer, if there is one (Puzzle)

I've worked out a solution to a problem, but I was wondering if there might be a better way to do this. I'm using a computer to calculate these...

• Replies: 1
• Views: 2,618
10-04-2008, 11:24 AM
15. ### Urgent-Statistical Test comparing means of unknown distributions

Is there a non-parametric test with which one can reject the null hypothesis of an equal mean (μ1 = μ2) between two sample distributions, over an...

• Replies: 1
• Views: 5,066
10-04-2008, 02:40 PM
16. ### help choosing LDA situation to implement

Hey all, I am a comp sci grad student interested in pattern recognition, and have been told that LDA is a good place to start before moving into...

• Replies: 0
• Views: 2,445
10-06-2008, 01:00 AM
17. ### which statistics to apply?

Purpose of my study is to understand better how the experimental lines I am using compare to the positive and negative controls under untreated or...

• Replies: 1
• Views: 2,493
10-06-2008, 09:15 AM

Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

• Replies: 5
• Views: 6,485
10-06-2008, 07:40 PM
19. ### A nice easy one about Repeated Measures ANOVA

Hello! A basic question from a not-very-statistically-savvy person: I have data from 2 groups of patients who underwent knee replacement...

• Replies: 5
• Views: 6,492
10-07-2008, 01:00 PM
20. ### Interval Level

Could anybody help with game theory in accordance to penetrating a market? Thank you for your answers!

• Replies: 1
• Views: 2,883
10-08-2008, 02:11 PM
21. ### A Simple Meta-Analysis query

Hi All, I am working on my first meta-analysis project and this may sound silly, but I am having difficulty deciding which studies to include. ...

• Replies: 0
• Views: 2,443
10-10-2008, 04:50 AM
22. ### concordance of two sets of data

here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

• Replies: 0
• Views: 3,376
10-13-2008, 12:29 PM
23. ### 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: 3,149
10-13-2008, 03:09 PM
24. ### Multivariate Analysis assistance needed

I have conducted a survey on online privacy sensitivity. Part of the survey used a previously-proven instrument to generate a Privacy Sensitivity...

• Replies: 4
• Views: 3,449
10-14-2008, 07:42 PM
25. ### Stat guidence for a research paper

I am currently in the process of writing up a small research paper, but I am quite rusty on my stats. I was wondering if anyone could recomend either...

• Replies: 1
• Views: 2,914
10-16-2008, 02:01 AM
26. ### 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: 17,497
10-16-2008, 07:34 PM
27. ### Quick Question about Null Effects in ANOVAs

Hi all, I just have one quick question: I've been analysing a reasonably large experiment recently using a repeated-measures ANOVA (with a...

• Replies: 2
• Views: 3,313
10-19-2008, 06:06 AM
28. ### Two Stage Least Squares Regression

I am trying to test a model and have been advised that 2SLS is the appropriate method. I am using SPSS which has the 2SLS option. My problem is that...

• Replies: 0
• Views: 5,029
10-19-2008, 06:35 AM
29. ### Principal components interpretation

I have principal components based on correlation matrix. Statistica PCA method report outputs not only factor loadings that depend on components'...

• Replies: 5
• Views: 3,929
10-24-2008, 04:26 AM
30. ### Poll: PCA, FA, CFA, latent variables, and making a scale.

Hi! I was wondering if anyone had any suggestions for me. I'm working with two datasets. One contains a population of cases (n=25) from 2005, and...

• Replies: 1
• Views: 4,339
10-28-2008, 12:13 PM
31. ### 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: 3,199
10-30-2008, 07:44 AM
32. ### Age-Matching Groups Who Differ on Age

I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

• Replies: 4
• Views: 5,828
11-06-2008, 02:17 PM
33. ### Help with thesis research on social bookmarking

Hi, I'm writing my thesis right now and I must admit that I underestimated the complexity of the required statistics a bit. My description is quite...

• Replies: 1
• Views: 2,686
11-07-2008, 09:54 PM
34. ### doctoral research

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

• Replies: 3
• Views: 2,582
11-10-2008, 02:13 AM
35. ### Factor Analysis Question

Hi everyone, I'm a Trainee Clinical Psychologist, not a statistician but we have research to do as part of our training so I'm hoping someone here...

• Replies: 5
• Views: 3,269
11-10-2008, 04:27 PM
36. ### 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: 14,266
11-11-2008, 01:27 PM
37. ### 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: 9,818
11-14-2008, 06:37 PM
38. ### finding data trends

I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

• Replies: 2
• Views: 3,609
11-16-2008, 03:31 AM

Alright, so honestly, I've actually looked up in both my textbooks as well as online tutorials for simplified explanations as to how I can solve the...

• Replies: 0
• Views: 2,261
11-17-2008, 12:18 AM
40. ### non-parametric test for repeated measurement

Hello everyone, I would like to know if some non-parametric test is available to asses wether 2 samples come from the same distribution for repeated...

• Replies: 4
• Views: 5,372
11-17-2008, 04:34 AM
41. ### Question on Log-Likelihood. Thanks in advance.

Question is: There are two lists of data, Y and X. Y is either 1 or 0, and X can be any number. And I have a logistic regression of Logit=B1*X, where...

• Replies: 2
• Views: 2,517
11-17-2008, 12:28 PM
42. ### help with sequential type of tests in statistics for hyppothesis testing

my research topic is sequential type of tests in statistics for hyppothesis testing and i have been told to coollect atleast 20 sequential type...

• Replies: 0
• Views: 2,097
11-18-2008, 10:13 AM
43. ### What are age effects?

Any thoughts? I've been asked to find these with some data I've been working with.

• Replies: 2
• Views: 2,360
11-18-2008, 10:33 AM
44. ### Hypothesis design

Hi, I have a question regarding hypothesis design. In other words, how to properly assign H0 and H1. For example, if I have statement: Some drug...

• Replies: 3
• Views: 3,314
11-19-2008, 12:31 AM
45. ### Survey analysis help: what tests to run?

I'm doing research investigating why South Korean students are reluctant to speak English in ESL classes. I've developed a survey with nine...

• Replies: 2
• Views: 5,528
11-19-2008, 05:28 AM
46. ### website splits - sample sizes

Id like to do some research into website splits. As visitors arrive to one of our websites (lets call it id=123), the page will randomly deliever...

• Replies: 0
• Views: 2,100
11-19-2008, 08:47 PM
47. ### Random Variables and Correlation

I claim that if x is a normal distributed random variable, and y is a uniformly distributed random variable then x and y cannot have a correlation of...

• Replies: 11
• Views: 5,671
11-20-2008, 03:47 PM
48. ### When are random variables random?

I have an environmental dataset in which a treatment was carried out on a series of plots (situated on the landscape) in duplicate. However the...

• Replies: 0
• Views: 3,529
11-26-2008, 09:34 AM
49. ### Is this a vaild data transformation method?

Hello Talkstats people, I am another hopeless case who needs some help with my dissertation statistics. Basically I am not sure if the method...

• Replies: 0
• Views: 4,445
11-26-2008, 09:49 AM
50. ### Factor Analysis help--Senior Thesis

I am an undergraduate and working on my senior research project. I am doing a study of the construct validity of a critical thinking test using...

• Replies: 2
• Views: 3,929
11-30-2008, 07:50 AM
51. ### 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: 12,347
11-30-2008, 11:37 PM
52. ### Effect of Culture on Scales

I am considering implementing a study asking respondents to rate several items on 1-10 scale. In America, I know the limitations of the scale. ...

• Replies: 0
• Views: 2,148
12-01-2008, 10:57 AM
53. ### 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: 25,859
12-01-2008, 06:50 PM
54. ### Help with analysing data

I have submitted a questionnaire indicating respondants to give their ranking in accordance to their preferred weighting - for example if they gave...

• Replies: 2
• Views: 2,449
12-03-2008, 08:12 AM
55. ### Correlation

I have a list of vehicle models and a number of costs associated with them. For example: Mazda 1000.50 euro Peugeot 2000.23 euro Mazda...

• Replies: 12
• Views: 2,858
12-04-2008, 09:32 AM
56. ### Manova outlier cutoff

I have been reading that Manova is very sensitive to outliers, particularly for small groups. One text I read suggests using 3.5 SD as a cutoff for...

• Replies: 5
• Views: 5,854
12-04-2008, 12:22 PM
57. ### jackknife

HI all, can some body pls let me know how can i do a jackknife regression. Actually i have done stepwise regression analysis and now i have to apply...

• Replies: 4
• Views: 7,934
12-06-2008, 06:30 PM
58. ### Product pricing question

Hello all. It's been a long time since I've been on this forum. Glad I was able to find it again. I'm afraid my stats experience is limited to...

• Replies: 0
• Views: 2,784
12-08-2008, 07:41 AM
59. ### Composite Scores - Approaches to Missing Data

I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

• Replies: 6
• Views: 6,609
12-12-2008, 09:43 AM

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