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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: 18,746
10-11-2014, 12:02 PM
1. ### Do support vector machines automatically do variable selection ?

Using the R command svm = svm(res~.,probability = T,type="nu-classification",data = train,cross=5) Does this "eliminate" variables so my svm...

• Replies: 0
• Views: 1,603
02-17-2013, 08:59 PM
2. ### Do the same minimum value requirements apply to chi-square for trend, as chi square?

Hi, I'm doing a project about dilated kidneys, these can be arranged into mild, moderate and severe. There are 53 patients in total. I want to see...

• Replies: 0
• Views: 1,722
07-12-2015, 11:05 AM
3. ### Do you know how you can solve this

I want to plot a graph of the mean of two groups in the experiment. They have different mean, different standard deviation. The interval bars that...

• Replies: 0
• Views: 1,796
10-07-2011, 05:22 PM
4. ### Do you like this measure for status inconsistency?

For my thesis I have a variable named 'status inconsistency', so I want to compare people whose income or profession doesnt allign with their...

• Replies: 0
• Views: 1,691
10-28-2014, 12:35 AM
5. ### Do you need to satisfy assumptions in regression if you do 10-fold cross-validation?

I wanted to get your opinion on this. When building models we want to make sure that the variables we have selected can be used in a model to predict...

• Replies: 10
• Views: 2,453
12-29-2012, 06:48 AM
6. ### Do you need to standardise data before running MCA?

I have both ordinal and categorical data and am attempting to perform a Multiple correspondence analysis. My question is if a dataset contains a...

• Replies: 1
• Views: 1,291
11-17-2015, 05:24 AM
7. ### 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
8. ### DOE for Logistic Regression

Hello- Does anyone have any references for DOE (especially multivariate testing / Taguchi) for binary response variables (analyzing with Logistic...

• Replies: 5
• Views: 4,219
08-28-2008, 11:18 AM
9. ### Does ANOVA tell which group is more /less than the other , or just they are different

I was reading a peer reviewed paper titled: (Going hybrid: An analysis of consumer purchase motivations) where the authors used factor analysis...

• Replies: 2
• Views: 2,111
09-21-2014, 09:31 AM
10. ### Does anybody have a calculus example for Bartlett and Levene tests?

Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

• Replies: 14
• Views: 6,445
09-07-2010, 05:59 AM
11. ### Does anyone know what associated means??

I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

• Replies: 1
• Views: 3,020
08-06-2010, 10:55 AM
12. ### Does autocorrelation in data affect (simple) correlation measures?

Hello everyone, I have a question concerning autocorrelation in data affecting correlation coefficients. I have a time series of stock returns...

• Replies: 0
• Views: 882
06-04-2015, 10:35 AM
13. ### Does frequency distribution matter when using nominal/ordinal data?

I want to do relationship analysis between different variables from questionnaire results that I've just collected and I've recently learned that you...

• Replies: 1
• Views: 1,162
05-07-2017, 05:41 PM
14. ### 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: 1,155
05-26-2012, 09:39 AM
15. ### Does my research proposal make sense? [Basic Stats]

Hi everyone, I'm new to statistics, statistical packages and research methods in general. Yet I'm fascinated by the subject and want to learn as...

• Replies: 2
• Views: 2,842
08-06-2013, 04:46 PM
16. ### does the following interaction make sense?

Hello, I have a problem, it would be great if someone could help me with it. I m analyzing a sample of patients with eating disorders (anorexia ,...

• Replies: 0
• Views: 1,356
06-21-2012, 01:12 AM
17. ### Does the NSA random number generator backdoor affect statistical random nummbers?

Hello, in my computer magazine I read 1 month ago, that the NSA has inserted a backdoor in the random number generating circuit on Intel...

• Replies: 1
• Views: 2,106
01-17-2014, 06:29 PM
18. ### Does the sequential Bonferroni correction method apply to my data?

The literature on Bonferroni correction methods is confusing me... I have compared means of multiple variables (some dependent, some independent)...

• Replies: 1
• Views: 2,384
01-07-2014, 04:56 PM

:eek: Please any kind person help, as I am horribly stuck!!! I have a *very* large dataset (n>300,000 rows) of water readings in this format; ...

• Replies: 2
• Views: 2,220
03-23-2010, 10:43 PM
20. ### Doubts analyzing Likert scales

Hi all, I thought about analyzing results from Likert scale using Kruskal-Wallis, but the more I read about it, the more confused I get. People...

• Replies: 3
• Views: 4,536
07-12-2012, 09:01 PM
21. ### Dropping observation

Hello I am too embarrassed to ask it as it looks very easy but I did not find answers to it and I tried hard. I have a sample of 5000...

• Replies: 1
• Views: 2,033
10-26-2015, 07:47 PM
22. ### Dummies in a correlation matrix

Hi everyone, I am working on a multiple moderate regression. And just wanted to add the correlation matrix as well. Now I got the responds that...

• Replies: 4
• Views: 2,123
02-27-2014, 12:07 PM
23. ### dummy*continous interaction- sig. main effect, non-significant interaction

Hi all, I would be grateful if someone could give me advice on the following topic: I estimated a glm and formed an interaction term out of a...

• Replies: 0
• Views: 1,845
06-28-2012, 05:33 PM
24. ### Durbin-Watson statistics - autocorrelation

If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

• Replies: 4
• Views: 3,511
03-21-2013, 04:01 PM
25. ### Easy Standardization Question

Hello everyone, I have a hopefully solveable question, however, I would like to get your opinion on it, as I am not 100% sure. I have a dataset...

• Replies: 0
• Views: 1,328
05-30-2012, 04:15 AM
26. ### Ecological Data advice on which test

I have done an experiment and am in dire need of some advice on statistical methods that I should use to answer the questions I seek. The...

• Replies: 0
• Views: 1,004
04-28-2013, 07:40 PM
27. ### Ecological statistics - comparison across three years

Hello all, I have a rather large data set to analyze, and I would appreciate some guidance. For this dataset, 80 plots were sampled for dead tree...

• Replies: 4
• Views: 1,796
06-08-2013, 04:38 PM
28. ### 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: 2,155
12-01-2008, 10:57 AM
29. ### 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: 3,153
06-30-2014, 06:25 PM
30. ### Effect-size Two-way ANOVA repeated measures

Dear statistical experts, I am getting confused on how to compute effect size in two-way ANOVA with repeated measures. - Should I use Cohen d...

• Replies: 0
• Views: 1,926
09-30-2015, 06:14 AM
31. ### Eigenvector for large matrices

Well, this is kind of a linear algebra question, but is used very often in statistics, so it seems applicable for this forum. My question is, does...

• Replies: 11
• Views: 7,047
07-01-2008, 01:58 PM
32. ### EM algorithm

Hello can you help me? I require a program for estimate of parameters in density of mixture exponential With EM algorithm . Thank you for your...

• Replies: 0
• Views: 3,589
04-09-2006, 03:44 PM
33. ### 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: 2,912
03-28-2011, 07:40 PM
34. ### EM algorithm - estimation

Hi. I try to implement EM algorithm for multivariate missing values, but i have problem with estimating function. Suppose µ is mean vector, Σ is...

• Replies: 0
• Views: 2,407
04-17-2011, 11:20 AM
35. ### EM Algorithm for Gaussian Mixture model fitting data with missing values

I have an EM function that will take regular data with no missing values, and compute means, standard deviations, and probabilities of components of...

• Replies: 1
• Views: 4,385
04-12-2011, 11:26 AM
36. ### Empirical QQ-plots for binomial GAM?

Hello everybody I've nearly finished my first binomial GAM analysis (presence absence data). I've been looking for ways to validate my models....

• Replies: 0
• Views: 1,867
01-28-2013, 03:45 AM
37. ### Employee survey: how to make it more representative?

Gentlemen, I am creating a survey to monitor employee satisfaction with their employers. I am designing a survey which contains questions...

• Replies: 1
• Views: 2,034
07-26-2012, 10:12 AM
38. ### Enrichment / over-representation of pairs, triplets, quadruples, etc.

Due to a lack of interest from users for over a month I would like to delete this thread.

• Replies: 0
• Views: 885
12-19-2015, 04:01 PM
39. ### Equivalent to RMSE for logistic regression?

I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally...

• Replies: 1
• Views: 6,479
08-09-2011, 10:54 AM
40. ### Error Analysis with Binned Data

Our income data comes in increments of $5,000 from$15,000 onward. The [$0 to$15,000) is one way too big of a bin. In any case, we also have...

• Replies: 0
• Views: 1,537
12-07-2012, 01:26 AM
41. ### error on percentile estimation

Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

• Replies: 2
• Views: 6,545
08-17-2010, 06:01 AM
42. ### error propagation

I have a point estimate of quantity 'A' and an associated standard error. If I calculate a new quantity (= ln-transformed 'A' multiplied by a...

• Replies: 0
• Views: 1,844
JFS
10-15-2014, 01:09 PM
43. ### Error propagation in integral with limits uncertainties

Hallo, I have one concern that I think the community can help. I need to calculate the definite integral where the limits have their errors as...

• Replies: 2
• Views: 5,545
06-23-2013, 03:16 AM
44. ### Error with Skillings-Mack test in R

I was trying to perform a Skillings-Mack test in R and can only get error message saying "Error in split.default(x = seq_len(nrow(x)), f = f, drop =...

• Replies: 0
• Views: 2,552
07-13-2015, 12:12 PM
45. ### estimate a range of measures

Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

• Replies: 0
• Views: 998
03-12-2016, 05:41 AM
46. ### Estimated Parameter as Dependent Variable

Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

• Replies: 2
• Views: 3,101
12-01-2016, 02:37 PM
47. ### estimated variable as dependent variable get robust standard errors

Hi, I have a problem with the calculation of standard errors when using a dependent variable in a regression model that was previously estimated...

• Replies: 0
• Views: 2,166
02-20-2014, 11:53 AM
48. ### Estimating a confidence interval for a pooled sample using only descriptive stats

Hi there Sorry for the vague title; I suspect my query is a simple one but I'm not quite sure how to phrase it. I have data on a number of...

• Replies: 0
• Views: 1,604
10-08-2013, 07:03 PM
49. ### 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: 1,475
04-27-2012, 12:34 PM
50. ### Estimating a term

I have observations on t_i, where t_i = a_i + b_i. a_i = \mu + e_i, where \mu is constant and e_i is the usual error term with mean 0. I also know...

• Replies: 5
• Views: 1,916
06-13-2011, 03:37 PM
51. ### Estimating initial level after the treatment!

Hi, Say I wanted to examine the effect of some treatment on a hormone level but I could not measure the pre-treatment level. Example, person runs...

• Replies: 3
• Views: 2,639
10-09-2009, 11:46 AM
52. ### Estimating likelihood of normal distribution mean shift after N samples

First off, sorry if this post is in the wrong place. Please feel free to point me to the right place to post. The scenario is as follows: I have...

• Replies: 6
• Views: 2,462
06-12-2013, 10:39 AM
53. ### Estimating location of lower tail

Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

• Replies: 2
• Views: 1,641
03-31-2016, 11:58 AM
54. ### Estimating overall output of multiple independent inputs - engineering project

Hi all I am conducting a final-year university engineering research project. The aim is to build a model (in the form of single implicit...

• Replies: 0
• Views: 1,355
09-27-2011, 07:25 AM

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