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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: 18,669
10-11-2014, 12:02 PM
1. ### low coefficient alpha

Hello, I have a question about coefficient alpha. How does having a low alpha effect your statistical tests if you are running say an ANOVA or a...

• Replies: 0
• Views: 4,533
05-19-2009, 11:19 AM
2. ### Interpreting Kruskal-Wallis results

Hi all, I've just finished my undergrad thesis and the reviewers strongly recommended that I pursue formal publication of my results. I thought...

• Replies: 10
• Views: 4,516
08-03-2014, 04:53 PM
3. ### Help with choosing statistics

Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

• Replies: 22
• Views: 4,511
11-22-2011, 12:09 AM
4. ### 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: 4,511
07-12-2012, 09:01 PM
5. ### Chi and linear-by-linear

A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

• Replies: 4
• Views: 4,511
03-14-2013, 01:37 AM
6. ### Which Model of ICC to use: one way; two way mixed, or two way random?

Hello All, I am using spss 21 My goal is to justify aggregating individual lower-level viability scores into a team higher-level viability score...

• Replies: 0
• Views: 4,509
VCH
08-02-2013, 05:26 PM
7. ### Calculating Effect Size

Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

• Replies: 7
• Views: 4,500
05-24-2011, 11:57 PM
8. ### 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: 4,498
BGM
04-05-2011, 07:38 PM
9. ### Converting 1 Distribution to Another

I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

• Replies: 5
• Views: 4,497
03-26-2010, 12:50 PM
10. ### Sunfish NMDS/PERMANOVA in reverse

I have extensive habitat data for four sunfish species, and I would like to determine if (statistically) they partition habitats to reduce...

• Replies: 3
• Views: 4,497
02-08-2011, 12:41 AM
11. ### Need for Bonferroni correction

Hi All, I'm hoping you can help me figuring out whether doing ANOVA or MANOVA save on power. My understanding is that ANOVA will tell you if...

• Replies: 4
• Views: 4,485
09-21-2011, 04:19 PM
12. ### Question Regarding Results from Matched Pair T-Test versus Tamhane's Test

I have a group of data from a survey regarding attitudes. The data was collected pre and post intervention on a group of students. The data n is...

• Replies: 1
• Views: 4,475
09-07-2010, 10:44 AM
13. ### Converting individual scores into group scores in SPSS

Hello all, I am using SPSS for my Master thesis and I've got a question. Hope someone is able to help me, because I'm stuck. My variables are:...

• Replies: 3
• Views: 4,460
09-24-2013, 02:25 PM
14. ### 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: 4,459
09-11-2008, 09:42 AM
15. ### markov chain modelling

Hi guys, Got a complex question regarding markov chain modelling. I'll start off with an example. Say you own a credit card and you can only...

• Replies: 7
• Views: 4,454
08-23-2008, 09:12 PM
16. ### Tests for Comparing AUCs for Significant Increases

I'm currently working on a project aimed at improving some of my program's risk assessment tools. We generally use AUCs to evaluate performance of...

• Replies: 2
• Views: 4,452
07-07-2011, 06:17 AM
17. ### Can fixed effects models deal with nested data?

I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

• Replies: 4
• Views: 4,450
03-10-2013, 03:41 PM
18. ### Percent Change

What should I put for the % change if the beginning value is 0 and the final value is >0, other than "not applicable"?

• Replies: 2
• Views: 4,448
03-16-2010, 01:38 AM
19. ### puzzling change in effect in multilevel linear regression; suppressor effect?

In my analysis of educational achievement of second generation migrants, I modelled the effect of mother's and father's education in two ways, which...

• Replies: 3
• Views: 4,436
09-09-2010, 05:56 AM
20. ### Likelihood Ratio Test

Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters...

• Replies: 5
• Views: 4,435
01-13-2011, 02:10 PM
21. ### Negative confidence intervals

HI THERE!! I am presenting 95% CIs in my thesis for the means of the data sets like metric tons of tuna exported per month, value of tuna exported...

• Replies: 4
• Views: 4,427
09-24-2013, 08:47 AM
22. ### 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: 4,398
11-26-2008, 09:49 AM
23. ### 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: 4,395
03-28-2011, 07:11 PM
24. ### how to control for firm performance ? (control variables) ?

I'm doing a research on how the debt ratio affect firm performance dependent variable is ROA independent variable is debt ratio control variable...

• Replies: 0
• Views: 4,374
07-01-2012, 08:44 AM
25. ### 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: 4,372
08-28-2008, 03:19 PM
26. ### TOST- two one sided t-test

Does anyone know how to compute these by hand or in minitab? Its an equivalence test, Thanks

• Replies: 0
• Views: 4,372
02-24-2012, 10:51 AM
27. ### Optimal combination of conditions

I am looking to find an efficient process to determine the set of conditions that results in the optimal likelihood of accomplishing some task. ...

• Replies: 12
• Views: 4,366
02-06-2011, 02:55 PM
28. ### kappa intra observer error test on ordinal

hi, sorry if this is all wrong ive never done stats or posted on this forum. im writing my masters dissertation in bioarchaeology and have a...

• Replies: 3
• Views: 4,361
09-11-2012, 12:23 PM
29. ### Comparing pretest and posttest measures of intervention group with control

Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

• Replies: 3
• Views: 4,358
02-27-2012, 12:05 PM
30. ### 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: 4,356
04-12-2011, 11:26 AM
31. ### Significant lack of fit, invalid model?

I am using JMP and working with percent arrival of insects (scale of 0-1). For example, out of 10 insects, 10 arrived at date X so 0.1 is that...

• Replies: 7
• Views: 4,342
05-30-2013, 03:20 PM
32. ### Pre and Post Likert Scale Survey Help

Hi, I am needing some help with a survey I am trying to get ready to conduct. The survey will be a pre and post survey given to the same group of...

• Replies: 1
• Views: 4,339
07-05-2011, 11:27 AM
33. ### Which test to believe ?

Hi, I did some analysis, I had 1 scale variable and 1 grouping variable with 2 groups. I ran a t-test and got p value of 0.09. The distribution...

• Replies: 10
• Views: 4,335
07-16-2011, 02:04 AM
34. ### Structured Modeling or Multiple Models?

We conducted a study in order to determine the factors that influenced turtle nest site selection. We collected various environmental variables from...

• Replies: 0
• Views: 4,334
12-20-2016, 09:24 AM
35. ### sample size - power calculations

Hi, would be great if anybody could help me on this. I want to estimate the impact of an independent variable x (lets say a social program) on the...

• Replies: 1
• Views: 4,333
06-23-2009, 12:01 AM
36. ### 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: 4,327
10-28-2008, 12:13 PM
37. ### Normality assumption test statistic for independent sample t-test (SigmaPlot output)

I'm using SigmaPlot12 to compare the means/medians of two populations. First, I run the Mann-Whitney Rank Sum Test. The software recommends using...

• Replies: 0
• Views: 4,316
06-14-2011, 11:00 AM
38. ### excel to SAS

library work 'c:\documents and settings\desktop\s' data s.sas; infile 'C:\Documents and Settings\Desktop\sas.prn' firstobs=2; input subject salary...

• Replies: 6
• Views: 4,315
11-07-2011, 04:08 PM
39. ### Alternative to two-sample t-test when proportions are SMALL (<0.001)

Hi, I'm looking for an alternative to the two-sample (independent) t-test for equality of proportions. The two-sample t-statistic only holds...

• Replies: 0
• Views: 4,311
01-14-2009, 04:15 PM
40. ### ANOVA n00b questions

Hello! I'm putting together a proposal and would like to conduct a certain type of analysis but my wording on this is rather weak so please correct...

• Replies: 20
• Views: 4,309
11-07-2011, 10:09 PM
41. ### Mann-Whitney or independant T-test?

Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

• Replies: 3
• Views: 4,298
06-13-2011, 05:01 PM
42. ### regression when the dependent variable is a proportion or percent?

If my outcome was dichotomous, I would use logistic regression. It my outcome was continuous, I would use linear regression. If my outcome was a...

• Replies: 1
• Views: 4,292
05-23-2011, 03:46 PM
43. ### Sample Size Calculation for Kruskal Wallis test

Sorry if posted in wrong forum As the title says it all, how to calculate a sample size for KW test? I'm a bit of a beginner here, should we just...

• Replies: 3
• Views: 4,291
07-08-2014, 12:13 AM
44. ### 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: 4,285
09-17-2008, 01:21 PM
45. ### homogenity of variance

I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

• Replies: 3
• Views: 4,281
09-22-2011, 02:58 PM
46. ### 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: 4,279
03-11-2011, 03:46 AM
47. ### 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: 4,279
04-15-2013, 03:15 PM
48. ### Marginal Effects

I know how to run marginal effects on STATA, but was never taught the theory behind them. Working through a textbook that I'm thinking of adopting...

• Replies: 0
• Views: 4,271
02-28-2010, 07:42 PM
49. ### z-test rule.

Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

• Replies: 5
• Views: 4,265
04-19-2011, 12:28 PM
50. ### Testing change between 2 samples at 2 periods of time

Hi Id wonder if anyone could help me. Im having one of those brain freeze moments when you think you may know the answer but really would...

• Replies: 0
• Views: 4,264
02-20-2009, 02:54 AM
51. ### Analysing an unbalanced factorial design

Hello, I have data from an unbalanced factorial design, and would like some suggestions to analyse them. It is supposed to be 3 x 2 factorial...

• Replies: 2
• Views: 4,262
02-28-2012, 11:43 PM
52. ### Question about Stationary R^2 and Ljung-Box Statistics in ARIMA Models...

On the results of my ARIMA models in SPSS, I am getting Ljung-Box statistics that are statistically significant (P < 0.05) but also horrible R^2...

• Replies: 0
• Views: 4,253
07-25-2010, 07:44 PM
53. ### Yule Walker - AR(1) - Covariance Forumla

Hello, I have the AR(1) process: Yt=phi*Yt-1 + et According to text books we ,ultiply by Yt-k, so we have: Yt*Yt-k=phi*Yt-1*Yt-k+et*Yt-k and...

• Replies: 1
• Views: 4,253
10-01-2011, 11:22 AM
54. ### chi-square difference test

Dear everybody, I need your help. I have submitted a manuscript showing that a two factor model is better than a single-factor model. I just have...

• Replies: 0
• Views: 4,251
01-13-2011, 05:04 AM
55. ### non-parametric 1-way anova, but samples not independent

Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

• Replies: 1
• Views: 4,239
09-07-2010, 07:27 AM
56. ### Transition matrix of a Markov chain with a given limiting distrubuti

I want to create a transition matrix P (e.g. 4x4) for a stationary Markov chain with a given limiting distribution p, but I want P to bear as much...

• Replies: 1
• Views: 4,238
04-08-2010, 08:44 PM
57. ### Using Kendall test to find correlation between Likert type data

Greetings! I am doing a small experiment and I was wondering if I have the correct method for analysing the data. Two groups of participants...

• Replies: 0
• Views: 4,234
01-19-2011, 11:31 AM

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