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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: 18,799
10-11-2014, 12:02 PM
1. ### PLS-DA: Are latent variables comparative?

Hello, first post on the forum - hopefully this is the correct place to do this. I've been working on developing an system for visualising the...

• Replies: 2
• Views: 3,463
05-27-2012, 07:40 PM
2. ### how to interpret interactions when one variable is in a log scale?

Hi there, I have a significant interaction in the model and was wondering how to interpret the coefficient given that one original effect is in a log...

• Replies: 1
• Views: 1,355
05-27-2012, 02:42 AM
3. ### how to interpret 2log(x)?

I have coefficient B for 2 log(x) and was wondering how to interpret it. In this case B=1.9. Thank you for your help.

• Replies: 2
• Views: 1,908
05-26-2012, 11:44 AM
4. ### does it make sense to square log(x)?

log(x) and 2log(x) in the model, log(x) is authomatically getting dropped from the model because of collinearity. Is it ok, or do I need to keep the...

• Replies: 0
• Views: 1,157
05-26-2012, 09:39 AM
5. ### Spatial Statistics

Hi guys, I'd like to ask for your feedback regarding appropriate statistical distances/information distances, etc on the following matter: Let's...

• Replies: 0
• Views: 980
05-26-2012, 01:52 AM
6. ### Correlations between twins - who is X and wo is Y?

I have some data on twins (all fraternal) and I'm trying to see if there is any correlation between them on several measures (e.g., body...

• Replies: 7
• Views: 2,705
05-24-2012, 04:33 PM
7. ### Statistical methods to determine the proportion to min. value of depandant variable

I am new to this forum, but heard alot about it from my classmates. I am basically doing an internship in a company. The company is using various...

• Replies: 0
• Views: 1,835
05-24-2012, 01:44 PM
8. ### Best suited forecasting method for forecasting of sales of truck/tractors?

Best suited forecasting method for forecasting of sales of truck/tractors? The constraints for forecasting are 1.The sale figures of trucks do not...

• Replies: 0
• Views: 1,224
05-23-2012, 10:06 AM
9. ### Comparing categorical data with 2 independent variables

Hi All, I'm a student researcher and am needing some statistical advice. I stumbled upon a post regarding a similar problem at this site, so I'll...

• Replies: 0
• Views: 1,419
05-22-2012, 09:12 AM
10. ### Comparing distributions

I'm working on analyzing data for a prof for publication and have come to a situation that I am lacking confidence in and am coming here for help. ...

• Replies: 12
• Views: 3,951
05-21-2012, 10:28 AM
11. ### help in Real survey data analysis‏

would you please guide me to analyze it? i will tell u overall view of the questionnaire and goals and hope to help me how to analyze it the...

• Replies: 2
• Views: 40,914
05-19-2012, 03:47 PM
12. ### Binary logistic regression with no significant predictors

Hi everyone, I have a question for logistic regression but i guess it applies to all kinds of regression analysis. I have a model with many...

• Replies: 3
• Views: 11,255
05-19-2012, 06:43 AM
13. ### Reliability of the results

We recently conducted a research for one of our client's ad effectiveness campaign. We had asked questions to a control group who were not exposed to...

• Replies: 1
• Views: 1,527
05-17-2012, 05:16 PM
14. ### Divergent results - RMANOVA vs. paired samples t-tests

Hi there, I'm analyzing a dataset (a pre - post intervention), where I have a baseline and 2 post-intervention time points. If I perform a RMANOVA...

• Replies: 0
• Views: 2,092
05-15-2012, 08:50 AM
15. ### Suggested form of statistical analysis?

I appreciate the feedback so far. Now, I'm wondering what type of statistical analysis I CAN do with a large amount of data that is pretty important...

• Replies: 6
• Views: 1,587
05-15-2012, 02:14 AM
16. ### one way anova

I'm currently doing a project and not sure what stat test to use. I did a population density experiment with manduca sexta. There were 3 densities...

• Replies: 1
• Views: 1,123
05-14-2012, 09:42 AM
17. ### Comparing two overlapping samples in a tracking study

I have a quick query about measures of sample accuracy in a tracking study with an overlapping (common) sample, and couldn't see anything here...

• Replies: 0
• Views: 1,378
05-14-2012, 01:19 AM
18. ### kaplan-meier from a survival function

hi, let assume I have a survival function, given as a solution from a continuous model. To be precise, the cumulative hazard is calculated, Ch(t),...

• Replies: 0
• Views: 1,649
05-11-2012, 12:16 PM
19. ### Bayesian t-test

Hello I tried looking for a simple explanation with an example of how to perform a procedure that will be equivalent to the t-test using Bayesian...

• Replies: 4
• Views: 4,203
05-11-2012, 06:11 AM
20. ### Bayesian approach to comparing parameters of two distributions

This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

• Replies: 4
• Views: 3,027
05-09-2012, 02:20 PM
21. ### What does "local" mean?

This seems like a very basic question: In a recent working paper I am writing a report on, the authors propose a test that is "locally...

• Replies: 0
• Views: 1,338
05-09-2012, 01:37 AM
22. ### Help in result interpretation

Hi All, I analysed a data set using descriptive analysis and I need someone to please help me interprete the results. Below is the result...

• Replies: 0
• Views: 987
05-07-2012, 03:53 AM
23. ### Problem with allocating data

Hello, Im currently writing my bachelor thesis in statistical finance and i have run into a small problem. I want to evaluate forcasts from my...

• Replies: 3
• Views: 1,873
05-07-2012, 03:11 AM
24. ### detect mean and variance shifts

from the plotted figure, how i can distinguish what i have to monitor mean or variance to detect a shift from the process

• Replies: 2
• Views: 1,604
05-06-2012, 04:25 PM
25. ### results SIMPER dissimilarity for species with equal mean abundance

Dear all, I am doing my master thesis on subtidal algae species in the north Atlantic. Herefore I have presence-absence data of different algae...

• Replies: 1
• Views: 6,077
05-04-2012, 09:08 PM
26. ### pairwise test PERMANOVA does not give t and p values for some comparisons

Dear All, Another question that me and my collegues/ professors cant answer, and maybe one of you can give some ideas. some introduction: I am...

• Replies: 1
• Views: 7,353
05-04-2012, 09:05 PM
27. ### 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: 3,150
05-04-2012, 07:55 AM
28. ### Where to find data (morning running vs evening running)?

Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

• Replies: 9
• Views: 2,710
05-02-2012, 05:42 PM
29. ### Groups split /Low and High

HI ALL, I would like to ask about the best and accurate way to dividing groups as low and high. And how I can conducted this analysis using the...

• Replies: 0
• Views: 1,065
05-02-2012, 09:19 AM
30. ### Inclusion criteria of participants and internval validity

Hi All, I am having trouble understanding how the inclusion criteria of participants can affect the internal validity of a study. This is my...

• Replies: 1
• Views: 26,179
05-02-2012, 07:15 AM
31. ### Correlation between two dependent variables on repeated measures

Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

• Replies: 2
• Views: 10,193
05-02-2012, 06:13 AM
32. ### Help with comparing very small proportions

I have a problem with comparing some proportions. I am looking at interactions between sequences in a genome and I want to compare the numbers of...

• Replies: 0
• Views: 1,396
05-02-2012, 03:45 AM
33. ### Time Series Dummy Variable and Time Trend

Hi, I currently have some research going on that requires me to put in a time trend variable t = {1,2,3,4,.....,N} where N is the total number of...

• Replies: 1
• Views: 5,234
05-02-2012, 12:04 AM
34. ### desperate for some help with a confidence interval question.

• Replies: 0
• Views: 1,563
04-30-2012, 08:30 AM
35. ### Bayesian confuson

Hi, I am trying to reconcile what I think are conflicting philosophies in my head about an experiment. The experiment is a hierarchical model...

• Replies: 2
• Views: 1,591
04-29-2012, 10:30 PM
36. ### Need assistance to conduct a validation of research instrument

I'm completing a PhD degree and need help from five PhD holders in order to conduct an instrument validation (face value and content validation). The...

• Replies: 0
• Views: 1,740
04-29-2012, 06:48 PM
37. ### Need Help on Hypothesis testing

Need help in understanding whether the method i am adopting is correct or not and what other tests i can include. I have a sample size of 720...

• Replies: 0
• Views: 987
04-29-2012, 04:34 PM
38. ### Optimal tests of hypothesis

I have a question about the use of optimal tests of hypothesis in practice. Are they often used in research or in industry? I understand that UMP...

• Replies: 2
• Views: 2,187
04-28-2012, 12:06 AM
39. ### Determining which data set is most like another

I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

• Replies: 6
• Views: 1,757
04-27-2012, 02:08 PM
40. ### Estimating a pdf from binomial trials - point me in the right direction?

Hi, I'm afraid I'm not an expert in statistics, but I have a particular problem I'm interested in solving. I'm pretty sure this area already has a...

• Replies: 3
• Views: 1,481
04-27-2012, 12:34 PM
41. ### Which test for multiple interventions?

Hi Just a quick question re: which test would be best for the following scenario Three interventions, one control. Participants provided...

• Replies: 0
• Views: 1,122
04-26-2012, 09:48 PM
42. ### 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: 1,511
04-26-2012, 03:22 PM
43. ### PCA of landmark data

Hi all, I am trying to analyse wing shape using PCA. I have used a morphometric approach and have coordinates of 20 landmarks for 60 different...

• Replies: 0
• Views: 1,963
04-26-2012, 10:49 AM
44. ### Nonparametric tests for serial correlation

Hello, Can anyone recommend a non-parametric test for serial correlation in a time series? Also, if the test is available in matlab? Thank you...

• Replies: 0
• Views: 1,744
04-24-2012, 10:40 AM
45. ### Fisher's exact test, Hypergeometric distribution

Hi, I need some help with Fisher's exact test and the hypergeometric distribution My data consists of: 500 mutations - that I want to score as...

• Replies: 0
• Views: 3,466
04-24-2012, 08:19 AM
46. ### Research using Fisher's Exact Test

I'm writing a paper based on published, stats data. I'm looking for a real research example of where Fisher's exact test is used on an extremely low...

• Replies: 0
• Views: 2,331
04-23-2012, 09:10 PM
47. ### How do you convert yearly and period CPI to that of a rolling basis?

Hi Guys, I am doing research and currently I am trying to utilize Consumer Price Index data. I have two sets of consumer price data, one that...

• Replies: 0
• Views: 1,037
04-23-2012, 04:35 AM
48. ### Categorical vs Ordinal data analysis

I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

• Replies: 3
• Views: 10,819
04-22-2012, 12:41 PM
49. ### Sports Forecasting - a million iterations

Hello, I am working on a forecasting project and would like to create a script that automates the following steps: order data by X characteristic...

• Replies: 0
• Views: 1,218
04-21-2012, 10:18 AM
50. ### simultaneous equations

hi guys, i need help regarding simultaneous equations. for the following simultaneous equations: R=b1+b2*Q+errorterm2...

• Replies: 8
• Views: 1,989
04-21-2012, 08:48 AM
51. ### T-test puzzlement

I've been pondering on this for some time and I guess i'm confused because there are so many stats tests out there. Basically my aim is to figure...

• Replies: 2
• Views: 1,658
nom
04-20-2012, 11:43 AM
52. ### directional stats: combination of von Mises distributions

Dear Stats-Experts: I am at loss in my research project and would appreciate any input, reference to literature, publications, etc. Here it goes:...

• Replies: 0
• Views: 1,543
04-18-2012, 09:33 PM
53. ### Bayesian updating or...?

Hi There, I'm new to this forum and also not an experienced statistician but I have a question. In my research I'm facing a problem that...

• Replies: 0
• Views: 1,283
04-18-2012, 10:18 AM
54. ### How to test this kind statistical hypothesis ?

Hey. How can I test H_{0} \: : \;\;\; \frac{\mu_{1} + \mu_{3}}{2}=\mu_{2}?

• Replies: 3
• Views: 1,879
04-15-2012, 09:59 AM
55. ### Beginner Statistics for Repeatability/Reproducibility

Hi all, I'm new to this forum and seeking help regarding stats for a research project. My stats background is minimal (one college level class)...

• Replies: 0
• Views: 1,038
04-12-2012, 08:50 PM
56. ### Goodness of fit for 2D histograms

Hello all, I've dragging this problem for quite a while now and I'd really appreciate it if someone could help me whit it. I have two sets of...

• Replies: 0
• Views: 1,719
04-11-2012, 07:11 AM

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