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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: 18,698
10-11-2014, 12:02 PM
1. ### ¿Weighted moments references?

Hi, I have a sample of frequencies and Sums(totals): Ni Si 23 12345 10 7800 ... Si is the sum over some variable X, measured...

• Replies: 0
• Views: 20,512
04-14-2013, 06:56 AM
2. ### [[ Which stats test(s) for assessing relative weights using ranked (ordinal) data? ]]

Hello forum, I've been mulling this problem over for a while and getting nowhere with it (generating more questions than answers) so I thought I'd...

• Replies: 0
• Views: 1,680
11-25-2012, 09:48 AM
3. ### [wilcoxon/paired t test] when to exclude data? Not normally distributed data.

Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

• Replies: 1
• Views: 1,333
11-28-2015, 08:10 AM
4. ### [Statistica - Nested Anova] How to do a two-way nested anova?

Hi, I'm trying to do a two-way nested anova in Statistica, but the results do not seen to be a two way model. In my study I need to compare if the...

• Replies: 0
• Views: 225
07-14-2017, 11:45 AM
5. ### [SPSS] Different sig. level with Two-way ANOVA vs. Independent T-test, Help!

Hi, I am confused right now. I am a newbie for SPSS. The sig. level in independent t-test is different from in two-way ANOVA. Why is that? My...

• Replies: 0
• Views: 1,371
07-29-2012, 05:56 PM
6. ### [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

• Replies: 0
• Views: 646
05-12-2016, 03:18 PM
7. ### [SAS] Compare predicted vs actual continuous [0,1] data

Hello, I have predicted values for year and quarter that were calculated from a linear regression, and I also have actual values. I would like to...

• Replies: 1
• Views: 2,161
12-08-2015, 08:01 PM
8. ### [R] permanova for multivariate repeat measures toxicology data set

Hello, I would like to use a permanova to analyze my repeated measures, multivariate data set using the package vegan (adonis function) in R. I...

• Replies: 0
• Views: 2,926
07-12-2013, 03:55 PM
9. ### [R] Estimation of the emprical distribution

Hi all, I was wondering if there's an R package online that automatically estimates the best distribution of my empirical data and gives the...

• Replies: 2
• Views: 734
04-27-2017, 01:26 PM
10. ### [Multinomial Distribution] Help with applying Multinomial to a biological problem

Hello all, I need help with a stats question I'm trying to solve for a biological question. http://en.wikipedia.org/wiki/Multinomial_distribution....

• Replies: 1
• Views: 1,413
08-12-2013, 11:49 AM
11. ### [Help] What is the statistical formula applied in this problem?

Stat/Math wizs, if you could kindly shine your beacon on this problem. I'm running some statistics using a clustering algorithm and it classified...

• Replies: 2
• Views: 2,165
05-14-2010, 11:15 PM
12. ### [Finite population correction(FPC)] Did I discover “FPC(nHr)”?

talkstats members are knowledgeable. Anybody knows there is any precursor already published FPC(H^n_r). The journals rejected my paper. Finite...

• Replies: 3
• Views: 2,108
09-07-2016, 09:09 AM
13. ### [ASK] [Quantification Theory Type I] Kansei Engineering Reference

Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

• Replies: 1
• Views: 3,229
03-11-2015, 05:17 PM
14. ### [ask] estimate the word "precision" from statistical book by using cluster sampling

hi everyone, i have been a task about how to estimate the word "precision" from statistical book by using cluster sampling. plz help me, i've been...

• Replies: 3
• Views: 1,669
04-23-2013, 07:03 AM
15. ### [ANOVA - Repeated Measures] When to include subject as a random effect?

I have an eye tracking study in which two groups of subjects (patient and control) are completing a face recognition task in which they learn a set...

• Replies: 2
• Views: 1,285
04-11-2017, 12:00 PM
16. ### Zero vs missing data

Hello I have a question regarding 0 (=zero) vs missing data. If I have an observation that have many variables but one of the variable is not...

• Replies: 3
• Views: 1,029
08-29-2016, 03:12 AM
17. ### Zero Inflated LOGISTIC Regression?

Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

• Replies: 2
• Views: 10,049
12-19-2012, 09:09 AM
18. ### 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: 4,284
04-19-2011, 12:28 PM
19. ### Z-test for different proportions: why are they all sig. different?

Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

• Replies: 5
• Views: 5,297
10-03-2010, 06:56 PM
20. ### Z-scores with non-normal data

Hi, I am reviewing someone's study in which they used z-scores to standardize and compare data. I see no mention of their test for normality and...

• Replies: 1
• Views: 5,164
06-06-2013, 07:46 AM
21. ### 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: 4,259
10-01-2011, 11:22 AM
22. ### Youden Index

Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

• Replies: 0
• Views: 6,154
06-23-2010, 02:51 PM
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: 4,794
03-19-2011, 05:37 AM
24. ### x-12-arima - Which model to choose ?

Hi I'm working with some data. But it isn't a long series. In fact, it has 47obs. The data is on levels. So, i worked with the multiplicative...

• Replies: 0
• Views: 1,048
03-14-2014, 03:16 PM
25. ### Writing my own package for classes

Hi, I'm looking for idea for package(about 5 functions and one base data) in R. Everything what come to my mind is closed to what I do on classes,...

• Replies: 6
• Views: 1,697
01-04-2012, 07:24 PM
26. ### Writing equations for latent growth curve models

Hi all, I'm a PhD student currently working on an independent research project using latent growth curve modeling. This is my first time using...

• Replies: 5
• Views: 2,090
06-01-2013, 02:11 PM
27. ### Would you help me? (Tranformations)

Hi, I was looking for tranformations for ratio data. I find that arcsine tranformation is adecuate for that kind of data (ratio). For that...

• Replies: 15
• Views: 5,303
06-06-2012, 09:07 AM

I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

• Replies: 1
• Views: 2,785
02-21-2009, 05:37 PM
29. ### Working With Population Data

Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

• Replies: 9
• Views: 7,076
09-23-2010, 05:12 AM
30. ### Within-Subjects for categorical data

Hello, I am struggling to find a suitable statistic test for one of my studies: I have 4 different conditions, and I want to test if my results...

• Replies: 0
• Views: 1,708
09-12-2011, 04:09 AM
31. ### within-subject factor

RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

• Replies: 0
• Views: 876
04-17-2014, 10:23 AM
32. ### Within Subjects OXO and confounds

Greetings! I'm helping a friend in the medical field with his research and I have an I/O Psych background - meaning lots of regression and...

• Replies: 1
• Views: 3,519
07-19-2009, 09:33 PM
33. ### within subjects factors

I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

• Replies: 7
• Views: 1,439
04-04-2014, 09:56 PM
34. ### Within Subjects Analyses Advice

Hi all, New user & first time poster. I'm finalizing my dissertation and am searching for similar examples as my project or some way to justify...

• Replies: 0
• Views: 888
06-01-2017, 07:12 PM
35. ### Wilk s theorem and LR test

Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

• Replies: 2
• Views: 3,634
03-30-2012, 09:56 AM
36. ### Wilcoxon Signed Rank test or Spearman's rho?

Dear madam/sir, My apologies for posting so quickly yet another question, but hopefully you can help me out once more. I'm still analyzing my survey...

• Replies: 3
• Views: 9,067
04-19-2013, 12:12 PM
37. ### Wilcoxon sign rank test and sample size

In the Wilcoxon signed rank test, it uses the binomial distribution to calculate p-value for n<20. What would it use if greater/equal to 20?

• Replies: 2
• Views: 2,095
03-07-2016, 04:21 PM
38. ### Wilcoxon rank sum test on Cross Validation Results

Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

• Replies: 2
• Views: 2,556
01-31-2012, 03:33 AM
39. ### Wilcoxon and Anova? Confused!

HI! I'm really quite new to stats so I apologise for glaring foolishness :P Basically in the study that I'm looking at is a within-subjects...

• Replies: 0
• Views: 1,933
04-04-2014, 06:50 AM
40. ### Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?

• Replies: 1
• Views: 735
05-24-2017, 09:47 PM
41. ### Wich data analysis to choose for my data?!

Hello to everyone, I'm new on this forum and I thank the team for this site. Actually I'm working with some data and I don't know which can be the...

• Replies: 5
• Views: 1,771
11-13-2012, 09:40 AM
42. ### Why use Kruskal-Wallis?

Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

• Replies: 9
• Views: 7,259
08-13-2012, 03:14 PM
43. ### Why use Chi-square?

Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

• Replies: 9
• Views: 4,677
08-15-2012, 01:58 PM
44. ### Why not go with tests dealing with unequal variances/unbalanced sample size first?

Hi All, Here is the context: a lot of texts for hypothesis testing/ANOVA first examine the cases where either the number of samples per group are...

• Replies: 4
• Views: 1,610
08-16-2013, 02:56 AM
45. ### Why no international statistical testing?

I am wondering why it's generally not done to conduct a statistical testing comparing prevalence rate between two different countries even they have...

• Replies: 3
• Views: 2,388
09-06-2009, 08:51 PM
46. ### Why does the following assumptions matter?

When running an ANOVA we are told that certain assumptions of the test must be present for it to be applicable to the data. I never understood the...

• Replies: 0
• Views: 1,791
01-12-2017, 07:24 PM
47. ### Why does a model with an interaction has to include the interaction main effects?

:wave: Hello fellow stats talkers, If we are only interested in an interaction, I was wondering why a model with a significant interaction also has...

• Replies: 1
• Views: 6,210
11-11-2009, 08:52 AM
48. ### Why "controlling for X" studies may be fatally flawed

I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

• Replies: 3
• Views: 2,800
10-19-2016, 06:45 PM
49. ### white test for heteroskedasticity

Hi everyone In STATA, how to inerpret the results of the heteroskedasticity test? I typed in imtest, white to do the test, and got these results:...

• Replies: 0
• Views: 3,262
09-15-2013, 08:50 PM
50. ### Which version of the Chi-Square test should I use?

Hello, I am doing an honors project at my university. It is for my stat's class and due to the very short length of our class we did not cover the...

• Replies: 0
• Views: 933
11-09-2013, 09:53 PM
51. ### which type of ANOVA?

N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in...

• Replies: 2
• Views: 1,822
12-19-2012, 07:35 AM
52. ### Which tests? Clarification plz!

Hi all! I’m currently doing some research and I’m a bit of a novice so wanted to check if I was on the right lines with the statistical tests I’m...

• Replies: 2
• Views: 1,916
08-17-2012, 01:18 PM
53. ### Which Tests?

Hello! I am considering a study I'll note below, but have limited statistical experience. Accordingly I am seeking insights on which tests are...

• Replies: 2
• Views: 2,277
08-03-2014, 10:56 PM
54. ### Which tests to use in these examples? Wilcoxon etc.

I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on...

• Replies: 4
• Views: 979
05-08-2017, 07:40 AM
55. ### Which Tests to applicate for Trends?

Hi everyone, it's christmas time again, which for me means, some free time :) During my free time I looked to acquire a bit more knowledge in some...

• Replies: 2
• Views: 1,450
12-23-2015, 12:49 PM
56. ### Which test?

I am trying desperately to figure out which test I should use. I want to test if self-efficacy survey results and/or internship opportunities result...

• Replies: 1
• Views: 1,915
09-21-2014, 06:15 AM

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