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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: 18,751
10-11-2014, 12:02 PM
1. Questions about approach

Hi, I am working with a large data set with all categorical variables except for age, which I will want to group in to age bands. I think I am...

• Replies: 2
• Views: 2,337
03-29-2011, 09:23 PM
2. interval censored data using bootstrap method

I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

• Replies: 2
• Views: 4,854
03-29-2011, 09:09 PM
3. What type of analysis??

The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

• Replies: 1
• Views: 2,077
03-29-2011, 07:11 PM
4. Choosing Statistical Tests for a Study

I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

• Replies: 8
• Views: 5,271
03-28-2011, 11:41 PM
5. ?is there a test for this?

I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

• Replies: 2
• Views: 2,107
03-28-2011, 08:45 PM
6. EM Algorithm

Hi All, I am trying to implement the EM algorithm for a 3 population exponential distribution. I am having the following issues. 1. If l1_true=;9...

• Replies: 1
• Views: 2,914
03-28-2011, 07:40 PM
7. Survival Analysis with non 0 start time

I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

• Replies: 2
• Views: 4,420
03-28-2011, 07:11 PM
8. What is the technique of analyzing pooled cross sectional data?

Like the title suggests, I have a data set that comprise of several cross sectional waves. The subjects in each wave are different, just to be clear....

• Replies: 0
• Views: 3,580
03-28-2011, 02:15 AM
9. Please help me with this question

A company is interested in investing in companies in Hong Kong. They have access to large dataset on the rate of return on assets (expressed in...

• Replies: 1
• Views: 2,224
03-27-2011, 01:14 PM
10. Need some help choosing correct statistical method for study

Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

• Replies: 2
• Views: 4,675
03-27-2011, 02:56 AM
11. Is Levene's transformation with ANOVA equivalent to Levene's W?

Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

• Replies: 0
• Views: 5,398
03-25-2011, 09:36 PM
12. Sigma within an averaged group

I am trying to assess variation in a process in which the sample is too small to measure individually. To get a rough idea of the variation, I have...

• Replies: 0
• Views: 1,882
03-25-2011, 09:28 PM
13. How to test the P-value in this type of situation

Hi all, this is my first post on the forum... I apologize in advance, this explanation might be a little long...please let me know if anything is...

• Replies: 2
• Views: 2,393
03-25-2011, 04:42 PM
14. Difference needed for power in fixed population.

Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a...

• Replies: 7
• Views: 3,394
03-25-2011, 12:34 PM
15. nonparametric estimate the distribution with a histogram only

Suppose X1,.., Xn ~iid F with mean mu_F The data is summarized in a histogram and that is all I have. I don't have the individual Xi (i = 1,...,n)....

• Replies: 3
• Views: 3,091
BGM
03-24-2011, 11:47 PM
16. Mixed Model Covariance Structure

I have a study with a somewhat unique experimental design which I would like to used Mixed Modeling to analyze. All subjects in the study were...

• Replies: 0
• Views: 3,062
03-24-2011, 08:28 PM
17. Clustering Analysis when to stop the algorithm?

I have a data set, let's assume 1,000 points, that I am attempting to form into clusters. I am using Hierarchical clustering in the sense that I...

• Replies: 0
• Views: 1,906
03-24-2011, 08:29 AM
18. Missing values with Row and Column Totals

Hello everyone, I'm working with government panel data (yearly data of manufacturing industry (row) by continent (column)) that has a lot (about...

• Replies: 0
• Views: 1,926
03-23-2011, 12:41 PM
19. Stats consulting assignment- need help!

Hello! I'm working on a short stats assignment (4 pgs including graphs and appendices) and while I have the basics down (representative, variance,...

• Replies: 1
• Views: 2,053
03-22-2011, 08:26 AM
20. Contingency tables with an expected value of 0

Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

• Replies: 6
• Views: 7,037
03-21-2011, 01:34 AM
21. Help with dissertation

Hello everyone. I need someone to make up a table for me for my dissertation. I've got the answers to it but can't figure out how the table can be...

• Replies: 1
• Views: 2,738
03-19-2011, 09:58 AM
22. Catching a growth trend variable for 5 yearly sales number

Hey everyone, I'm doing research in international business. I will skip the details and get to my basic problem directly. I have 300 firms in...

• Replies: 0
• Views: 2,614
03-19-2011, 07:39 AM
23. xtDPDsys postestimation

Hi all I run two equations using xtdpdsys, the postestmation came as follows First equation estat sargan Sargan test of overidentifying...

• Replies: 0
• Views: 4,826
03-19-2011, 05:37 AM
24. SEM - indirect effects

Hi all, Software for SEM (Amos, Lisrel) provides estimates for indirect effects, and small size coefficients are often found to be statistically...

• Replies: 1
• Views: 8,624
03-18-2011, 03:41 AM
25. Bootstrapping Dependent Data

Is there any bootstrapping procedure for dependent data which is not based on any specific model?

• Replies: 2
• Views: 2,185
03-16-2011, 10:03 PM
26. Statistics for data analysis

I'm currently writing up a research practical report for a study I did as part of my degree. I've become a little stumped when it comes to the theory...

• Replies: 4
• Views: 2,873
03-16-2011, 07:21 PM
27. Non normal distributed Statistical Test

I am doing Statistical test between independent variable vs dependent variable Independent : Numeric Data - eg: Age (5,6,78,19) Dependent :...

• Replies: 1
• Views: 3,439
03-16-2011, 10:54 AM
28. This may be extraordinarily easy

I don't know which is why I am asking here on this forum. We are in the middle of a debate and I have absolutely no idea whatsoever of what the...

• Replies: 1
• Views: 2,345
03-14-2011, 06:19 PM
29. 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: 3,257
03-14-2011, 05:35 PM
30. Tests for nonnested models (Vuong, Clarke)

When comparing generalized linear models, do the Vuong and Clarke tests require that the response distributions be the same? For example, could I...

• Replies: 0
• Views: 3,719
03-12-2011, 01:41 PM
31. Two-step PPS stratified sample: how to choose additional respondents?

Hello, I find nothing in the literature on how to deal with this, so here goes. We have a relatively complex sample, and we need to acquire...

• Replies: 0
• Views: 4,315
03-11-2011, 03:46 AM
32. chi-square assumptions with survey data

Hi guys, I've been asked to run some analyses on some survey data and since it's been a long time since i ran one, I just wanted to check I'm not...

• Replies: 1
• Views: 2,878
03-10-2011, 02:10 AM
33. Significance testing for proportions (NPS)

I have 2009 and 2010 NPS (Net Promoter Score) survey results. Now I want to test if the change in 2010 NPS from 2009 is statistically significant or...

• Replies: 2
• Views: 7,754
03-07-2011, 05:17 AM
34. Any way to test significance?

First off, pardon my novice-level knowledge of statistics. If I make any ridiculous assumptions or whatever, this is why! So I'm doing a bit of...

• Replies: 7
• Views: 3,369
03-07-2011, 02:59 AM
35. 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: 3,233
03-06-2011, 04:44 PM
36. Testing for a change in mean in a time series

Suppose I have m observations from a time series before some specified date, and n additional observations after that date. The mean of the time...

• Replies: 1
• Views: 5,040
03-05-2011, 09:35 AM
37. t-tests after three-way ANOVA?

Hi all, I've just run a three-way ANOVA on my data (3 IVs, 1 DV). I've got some main effects, as well as a three-way interaction effect. Am I...

• Replies: 3
• Views: 5,889
03-04-2011, 05:20 PM
38. 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: 45,734
03-03-2011, 09:11 PM
39. which statistical test to use in spss

I have a variable (dependent) and five independent variables. How can I test if the five variables affect the dependent variable? Which test should...

• Replies: 1
• Views: 5,849
03-03-2011, 08:56 PM
40. Common method variance

Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

• Replies: 2
• Views: 3,828
03-03-2011, 08:52 PM
41. Office for National Statistics YouTube channel

The Office for National Statistics has recently launched a new YouTube channel explaining some of the stories about their statistics. Its a new...

• Replies: 0
• Views: 3,777
03-03-2011, 05:31 PM
42. Bootstrap for estimating parameters...

Hi. Let say we have only one original sample in which we are interested only on one statistics c of this sample, e.g. median. And let say we want...

• Replies: 0
• Views: 1,729
03-01-2011, 11:03 PM
43. large samples and resampling stats

First post here. Mods- please move thread if in wrong place. I am working with a very large dataset (total n = 30,000+) of normally distributed...

• Replies: 1
• Views: 3,308
02-28-2011, 12:51 PM
44. Correlation or Difference?

hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

• Replies: 2
• Views: 5,629
02-26-2011, 11:41 AM
45. 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: 18,822
02-25-2011, 02:56 PM
46. Prerequisite for gene regulatory network research (systems biology)

I would appreciate any advice or directions on what to study and in what order, from basic statistics and probability course to were one is able to...

• Replies: 0
• Views: 2,921
02-24-2011, 03:46 PM
47. Pharmacology Exp Help

Hello. I have been volunteering at a lab and need help with Behavioral Analysis. My data points are activity (locomotion) "counts" of 10 min...

• Replies: 5
• Views: 2,601
02-24-2011, 10:52 AM
48. Best Approach

Hi, I am looking to analyse a data set consisting of one dependent variable - respondent satisfaction values ranging from 1 to 10 - with three...

• Replies: 2
• Views: 2,447
02-23-2011, 11:38 AM
49. Hypothesis testing for comparing single channels of states in multivariate HMM

In brief: I have a multivariate observational output with low covariances, each dimension of which can be considered the result of a distinct hidden...

• Replies: 1
• Views: 2,494
02-23-2011, 03:34 AM
50. Please help: Need a method to compare rankings over different circuits

Hello, I do not have a background in statistics. I need help finding a methodology to compare the performance of a given set of items under...

• Replies: 0
• Views: 2,147
02-22-2011, 05:07 PM
51. paper about different robust approach

I can not find any paper about, robust statistics where they are looking to outliers not like a outlierts but like that model miss specification. ...

• Replies: 0
• Views: 1,754
02-22-2011, 01:03 PM
52. Fisher LDA

Hi, How do I incorporate knowledge of prior class probabilities p_i into Fisher LDA? I think Fisher LDA assumes p_i = 1/c always, with c=# of...

• Replies: 2
• Views: 4,154
02-22-2011, 11:39 AM
53. What is the correct statistical test for the Root Mean Squared error?

Thank you an answer to this question is no longer required. I'm not able to delete this though!

• Replies: 0
• Views: 2,319
02-22-2011, 04:37 AM
54. MLE for given mean

The observed value of mean of a random sample from N(\theta,1) distribution is 2.3. If the parameter space is \Theta=\{0,1,2,3\}, what is the MLE of...

• Replies: 2
• Views: 2,227
02-21-2011, 10:59 AM
55. 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: 18,214
02-19-2011, 07:26 PM
56. Determining a new variance

I am trying to understand a property of ML Estimates, that their distribution is asymptotically normal with covariance matrix inverse of Fisher's...

• Replies: 1
• Views: 2,514
BGM
02-19-2011, 04:30 PM
57. RCBD Subsampling or Not?

I am currently working on a project looking to compare seedling height growth between two different years. The project is set up like this: There...

• Replies: 0
• Views: 2,013
02-18-2011, 04:23 PM
58. Kolmogorov-Smirnov to Lattice Path mapping

I often see the claim that the null distribution of Kolmogorov's D+ statistic maps onto a lattice path problem that requires computing the number of...

• Replies: 0
• Views: 2,405
02-17-2011, 05:11 PM

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