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Dason ‎(Devorador de queso)
05-10-2017
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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: 18,662
10-11-2014, 12:02 PM
1. ### Find Total Utility Consumed

Hi, I have snapshots of electricity cosumption data. For eg. at 4:00 am, the consumption is 3000 kw at 4:15 am, the consumption is 15205 kw at...

• Replies: 2
• Views: 1,113
09-30-2012, 11:23 PM
2. ### Finding an extended Fmax table for an experiment with 25 treatments

Hi everyone. Many of my experiments have a lot of treatments (>25) and I'm having a problem when it comes to calculating a critical Fmax value,...

• Replies: 0
• Views: 1,270
08-29-2012, 03:20 AM
3. ### Finding cyclic function from points with more than 2 indep. variables

Hello, I am doing my master thesis in Electrical engineering about the impact of the humidity and temperature on power consumption I have a...

• Replies: 0
• Views: 3,249
12-11-2010, 08:45 PM
4. ### 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: 3,570
11-16-2008, 03:31 AM
5. ### Finding degree of difference

I am given two sets of data collected by two different people. The data in includes the variables area, production and productivity of coconut. Now,...

• Replies: 2
• Views: 1,465
07-10-2015, 01:54 AM
6. ### Finding my control group PSM, Matching or regression model and correct for confounder

Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

• Replies: 3
• Views: 1,602
03-02-2017, 09:41 PM
7. ### finding quantiles

how do you find the quantile of a single number in a distribution in R? input: number output: percentage THank you!

• Replies: 5
• Views: 7,469
07-31-2008, 04:08 PM
8. ### Finding relationship between 2 curves over time

Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

• Replies: 1
• Views: 3,752
03-11-2009, 05:40 PM
9. ### Finding Relationships with Crosstab Data

first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

• Replies: 4
• Views: 2,079
06-25-2013, 04:52 PM
10. ### Finding SD given mean and n

I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

• Replies: 2
• Views: 4,084
04-04-2011, 11:53 PM
11. ### Finding the correct test for binary data

Hi folks, i have some problems with my evaluation. We have collect tons of data from 23 persons for our new road study. I have now a time series...

• Replies: 1
• Views: 2,029
11-12-2011, 08:30 AM
12. ### Finding the cov matrix of MLE using Hessian

To properly calculate the covariance of an MLE you would need to find the inverse of the Fisher information matrix, evaluated at the MLE. And this...

• Replies: 1
• Views: 7,517
09-10-2010, 03:20 PM
13. ### finding the standard deviation and mean from frequency table

I have a frequency table showing age distribition in Auckland supercity election 2010 and I have in the coloumns I have Age, frequency, percentage,...

• Replies: 21
• Views: 20,800
11-12-2011, 03:41 AM
14. ### finding UMVUE

let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

• Replies: 3
• Views: 6,933
BGM
11-13-2010, 01:44 PM
15. ### Fisher information matrix

Hello everybody, I read here that the Fisher information matrix was the inverse of covariance matrix. How can I show that ? My definition of...

• Replies: 0
• Views: 4,224
08-20-2009, 09:01 AM
16. ### 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: 4,110
02-22-2011, 11:39 AM
17. ### Fisher's exact test

I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count...

• Replies: 3
• Views: 8,877
09-01-2011, 02:02 PM
18. ### Fisher's Exact test and subjects with multiple observations?

Hi Everyone, I was wondering if I could please have some advice on how to deal with data that have multiple observations for some of the subjects...

• Replies: 4
• Views: 1,287
01-20-2016, 06:31 PM
19. ### Fisher's Exact test significance, APA results phrasing

My original post questions were answered offline. Thanks for allowing me to post!

• Replies: 0
• Views: 2,281
07-10-2012, 10:42 PM
20. ### 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: 3,418
04-24-2012, 08:19 AM
21. ### Fisher's Scoring Iterations ?

Hi, what does Fisher's Scoring Iteration mean?? Fisher's exact calculation gives a score of 4 but what does this number mean exactly?? Thanks, S

• Replies: 0
• Views: 4,275
04-15-2013, 03:15 PM
22. ### Fisher's z transformation in path analysis

Hi guys. I am a psychology honours student doing my thesis by producing a path analysis that I ran with two different samples - one with a younger...

• Replies: 0
• Views: 3,350
09-21-2009, 09:14 PM
23. ### Fishy problem- which stat is appropriate? t-test or mann whitney

Hello kind stats people, I'm in a bind! In my PhD I'm studying fertilisation success of 2 species of fish when they mate with each other. So how...

• Replies: 0
• Views: 2,148
07-13-2011, 09:18 AM
24. ### Fitindices to determine optimal clustersolution in clusteranalysis

Hello, My question is about the selection of the optimal cluster solution. I have used SPSS version 21.0 to perform a cluster analysis in which...

• Replies: 0
• Views: 693
04-29-2015, 04:53 AM
25. ### Fitting Archimedean copula

hello, I am attempting to fit an archimedean copula in R, clayton specifically. I attempt to use the fit.AC function. I get the following...

• Replies: 2
• Views: 5,148
12-23-2010, 08:31 PM
26. ### Fixed and random effect models?

I've come across these model names in the literature and don't have that much background info on the topic. I was reading some definitions I found by...

• Replies: 1
• Views: 1,458
02-20-2013, 06:34 AM
27. ### 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: 1,929
02-01-2013, 07:40 AM
28. ### fixed or random factor for ANOVA

I've had a discussion with a colleague over the proper way to analyse results of an experiment. We tested the performance of 6 subjects in a...

• Replies: 1
• Views: 3,035
09-19-2011, 08:12 PM
29. ### Fixed/Random Effects model v. OLS Regression with dummies

Hello everyone! :wave: I have three consecutive waves of panel data with which I will be estimating incomes based on the Mincer equation. I have...

• Replies: 2
• Views: 1,809
05-13-2014, 10:49 PM
30. ### Fleiss Kappa - an interesting blog and a question for your help

Hi there, I am new to this forum. Hope you had a great Thanksgiving (if you are from Canada)! In my research, I have asked three evaluators to...

• Replies: 0
• Views: 2,575
10-11-2011, 03:24 PM
31. ### Football (Soccer) Betting Model Inference

British Football (Soccer) Betting Model Inference Hi,Guys! I am not a statistician, so please forgive me if I miss some points (which I surely...

• Replies: 2
• Views: 5,128
01-06-2011, 01:12 PM
32. ### Forest plot total calculator for OR and RR

Hi, Im doing a meta-analysis with studies of both case control and cohort and Im trying to put them all together in a forest plot. Hence, I find...

• Replies: 0
• Views: 1,404
04-09-2015, 10:29 PM
33. ### Forest Plots - Please Help!!!!!

How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

• Replies: 3
• Views: 8,774
06-22-2011, 05:55 PM
34. ### Formula of Return

I am new at Business Research, i have a problem that i am not sure about the formula of calculating return. Can you please help me confirm that...

• Replies: 1
• Views: 4,497
BGM
04-05-2011, 07:38 PM
35. ### Four Factor Design ~ Homoscedasticity Problem

Hello! For school, I have decided to do a project on airline reliability; specifically, looking at on-time departures. I decided to use a four...

• Replies: 0
• Views: 1,453
01-12-2014, 08:20 PM
36. ### Frequency data analysis - repeated measures, between groups

Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

• Replies: 3
• Views: 1,474
11-01-2012, 06:17 PM
37. ### Frequency Distribution

Hi all :wave:. I have a question, that is very important for me! :( It is written in book "basic statistics for business and economics" for...

• Replies: 2
• Views: 1,485
BGM
09-27-2013, 07:32 AM
38. ### Friedman test -- post hoc

Good day, I am willing to compare n sample means (where n > 2) of random variables. I am willing to use Friedman test to see if there is any...

• Replies: 0
• Views: 3,089
11-12-2011, 03:02 PM
39. ### Friedman test...

I really hope someone can help as I am a bit lost and my knowdledge in statistics is very basic. I have done an experiment in which I have...

• Replies: 0
• Views: 1,533
ARI
10-18-2011, 10:12 AM
40. ### 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: 5,951
08-31-2008, 02:58 PM
41. ### From Pearson correlation to LMM Contribution

Hi, I have two variables X1 and X2 which are poorly correlated (Pearson; r=0.1). Since we think the relation between X1 and X2 varies daily, I...

• Replies: 2
• Views: 216
08-17-2017, 02:58 AM
42. ### Full factorial design

I have the followinf situation for a full factorial design. Estimated Effects and Coefficients ________t____ p-value...

• Replies: 0
• Views: 3,324
01-19-2010, 08:14 AM
43. ### further causal analysis

Hi All, So I did this analysis on a dataset by exploiting partial correlation matrix. I can see how the variables are related to each other and to...

• Replies: 6
• Views: 1,801
09-06-2012, 03:56 PM
44. ### Fuzzy RDD in Stata with two cutoff points

Dear all, i am running a Fuzzy Regression Discontinuity Design using 2SLS in Stata. My question is basically if i specified the model (and most...

• Replies: 0
• Views: 287
08-20-2017, 03:02 PM
45. ### G*Power 3.12 Help

Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

• Replies: 0
• Views: 2,991
01-06-2011, 11:09 AM
46. ### Gage R&R results to usable data

This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section...

• Replies: 1
• Views: 1,241
09-12-2016, 04:21 AM
47. ### Gamma distribution

Hi, If I have three independent variables that all follow the gamma distribution, what distribution will then sum of these variables follow? ...

• Replies: 0
• Views: 941
06-28-2016, 02:56 AM
48. ### Gamma Poisson Mixture with finite Gamma

Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am...

• Replies: 0
• Views: 1,657
11-30-2012, 06:49 AM
49. ### 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: 1,536
06-15-2013, 05:13 AM
50. ### GAMs: test of simple effects following a significant interaction

Hello, I am a novice in Generalized Additive Models (GAMs) and I would need some advice on these models. From capture data, I would like to...

• Replies: 0
• Views: 2,893
11-22-2016, 01:44 PM
51. ### Garch fitting when some of the data might be inaccurate

Can anyone guide me to any newbie-ish literature on how to fit garch parameters (for example in Garch 1,1) to data where a small percentage of...

• Replies: 0
• Views: 2,627
01-11-2010, 10:53 AM
52. ### Gaussian Processes - Wiener process - The drunk particle

Hello, I recently read about Gaussian Processes (http://en.wikipedia.org/wiki/Gaussian_process) for non linear regression. I am not an expert but...

• Replies: 0
• Views: 2,228
03-04-2013, 12:21 PM
53. ### gee longitudinal

Hi there, I goin crazy with GEE and longitudianl data. I've studied the algorithm in many books and I am sure that I understand it and try to...

• Replies: 0
• Views: 2,034
05-23-2010, 05:01 PM
54. ### gender differences

Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

• Replies: 6
• Views: 5,003
05-09-2009, 07:40 PM
55. ### General inverse variance method

Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know...

• Replies: 1
• Views: 1,310
01-25-2016, 08:55 AM
56. ### General lasso question

Hi all, I'm using logistic regression with a lasso-like constraint on the parameters. I have noticed that very often the sum of the absolute...

• Replies: 0
• Views: 2,449
06-13-2007, 09:07 AM
57. ### General method for data analysis

Dear community, maybe you can help me. I have a lots of data like this format: Person/points/work/power/sex Person1/75/10/120/m...

• Replies: 3
• Views: 1,329
11-14-2013, 10:32 AM
58. ### General Term for Models with Dependend and Independend Variables

Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

• Replies: 3
• Views: 2,432
01-26-2015, 06:44 AM

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