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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: 18,694
10-11-2014, 12:02 PM
1. ### Question about splitting data

I am wondering what the most common way to handle data is wherein a participant belongs to multiple groups. For example, if you're wanting to run...

• Replies: 0
• Views: 1,218
08-14-2014, 09:25 PM
2. ### Correct methodology when not sure of linearity for continuous response variable

I already posted on this, but haven't gotten an answer to my core question - which is, what type of statistical analysis should I run. I have...

• Replies: 1
• Views: 1,201
08-17-2014, 04:21 AM
3. ### How to compare data from different periods

I want to analyze the performance of two groups of organizations over time (year to year), using existing information. The groups are similar,...

• Replies: 0
• Views: 4,878
10-14-2009, 12:43 PM
4. ### Which statistical test? Help

Hi I am stumped on what statistical test to used and was looking for some advice for a present study. There is one IV: experimental vs control...

• Replies: 1
• Views: 1,208
02-13-2013, 12:19 PM
5. ### Need help!!

Im doing my research on groeth response of tomato. And i got the average weekly increment in height T1-34 cm t2- 38 cm t3- 43 cm t4- 48 cm t5-...

• Replies: 1
• Views: 1,375
02-05-2014, 11:53 AM
6. ### Assumed autocorrelation

Hi all-- I apologize if this is an incredibly naive question, but I'm currently working with a signal and I need to find the "assumed lag-1...

• Replies: 0
• Views: 1,542
10-27-2010, 09:35 AM
7. ### 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: 2,351
01-07-2014, 04:56 PM
8. ### Confused: Metropolis-Hastings, its variations and the Hastings correction ratio

Hello everyone, Over the past few weeks I have been studying MCMC and Metropolis-Hastings algorithms. Unfortunately I am stuck and confused with...

• Replies: 2
• Views: 3,294
02-08-2016, 11:05 PM
9. ### Testing for trend in a r*c table, in STATA which method should I use?

I have searched for multiple websites, and only found the information regarding how to test the trend in a 2*k table, which was not the exact...

• Replies: 0
• Views: 817
07-29-2016, 02:04 PM
10. ### [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: 2,107
09-07-2016, 09:09 AM
11. ### T test

Experimental design 3 virus types x 3 exposure concentrations x 2 replicates of 15 fish How can I use the T test to determine if my replicates...

• Replies: 1
• Views: 1,938
10-13-2009, 10:12 PM
12. ### Convert SD and confidence intervals

Hi I want to perform a meta analysis on pain outcomes. Some studies use a 0-10 scale, others 1-10, 0-100 or 1-100. I'd like to convert the...

• Replies: 0
• Views: 1,354
05-12-2014, 11:32 AM
13. ### MANOVA post hoc or simple main effect

does anybody know, when conducting a 3 x 3 MANOVA, if the interaction effect and both main effects are significant, is there any...

• Replies: 0
• Views: 2,618
10-04-2011, 09:10 AM
14. ### Data collection gone awry -- now what do I do?

Trying to keep this as brief as possible ... I handle the stats for a pilot project for my employer (a government agency). We're trying to...

• Replies: 0
• Views: 2,350
03-30-2010, 02:21 PM
15. ### Intermediate outcomes: use as predictors in logistic regression, or use Naive Bayes?

I am predicting whether or not someone will receive a grant from an agency (dichotomous outcome). I have generated a model that uses various...

• Replies: 0
• Views: 3,496
12-08-2010, 03:45 PM
16. ### Using "AIC per sample" to compare logistic regression models

I'm generating nested models using logistic regression and comparing them by AIC. One issue that arises is that not all samples have all...

• Replies: 1
• Views: 2,428
09-05-2011, 10:34 PM
17. ### Need help to understand which statistical test to use on my data.

Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

• Replies: 2
• Views: 2,505
04-25-2013, 03:25 PM
18. ### Could anyone recommend an interactive application for mass data analysis?

Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

• Replies: 13
• Views: 3,105
05-31-2012, 09:25 PM
19. ### How can I statistically prove which data is more reliable

We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

• Replies: 0
• Views: 2,525
11-26-2016, 12:56 AM
20. ### How to perform reverse score transformations? (non-normal data)

Hello, Sadly, my data are significantly non-normal, negatively and not positively skewed, so that leaves me, according to some statisticians, with...

• Replies: 1
• Views: 1,132
05-12-2016, 06:13 AM
21. ### how to Compare means of first differenced stationary time series

hello! I have a monthly data series of commodity spot prices from 1994 to 2010. I have split the data from 1994 to 2002 and 2003 to 2010 due to...

• Replies: 0
• Views: 1,208
06-03-2014, 11:34 PM
22. ### 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: 2,013
07-26-2012, 10:12 AM
23. ### Project ideas for Statistical quality control

I was hoping I could get some beneficial input as to what problem I should address for my statistical quality control project. As of now we have...

• Replies: 0
• Views: 5,809
03-01-2014, 09:38 PM
24. ### How to analyze my bat data...number of bats vs. distance categories..

Hello. I have some bat data that looks a bit like this: Distance from Unit Number of bats recorder 0-10metres ...

• Replies: 1
• Views: 1,911
07-07-2013, 02:54 PM
25. ### Chance performance in a binary choice task

Hello! I am analyzing data in which participants have answered 80 binary-choice questions; one option is correct and one option is incorrect. Is...

• Replies: 1
• Views: 2,279
BGM
03-26-2012, 11:34 AM
26. ### How robust is ANOVA's F-statistic?

Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

• Replies: 3
• Views: 3,202
06-29-2012, 01:48 PM
27. ### Multivariate analysis with dependent variables and replicates

Dear All, I have been stuck in this issue for 2nd day now. I have a dataset of 13 depended variables (consequitive (not repeated!) measurment...

• Replies: 0
• Views: 1,406
08-10-2012, 05:49 AM
28. ### Multiple comparisons and multiple time points

Hi all, I wanted to ask a questions that I would assume I should know by now... I have done an experiment where I am evaluating the effect of...

• Replies: 4
• Views: 2,110
04-01-2013, 02:10 PM
29. ### Chi-square influential categories

I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

• Replies: 3
• Views: 1,654
10-27-2014, 03:55 PM
30. ### Power analysis 1-sided vs 2-sided

I'm curious how power analysis changes when you go from a 2-sided test to a 1-sided test. If in both cases I keep my alpha at .05, my effect size and...

• Replies: 0
• Views: 3,704
01-27-2011, 04:20 PM
31. ### Sample Size Selection

Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

• Replies: 3
• Views: 2,017
12-12-2015, 09:28 PM
32. ### Using a valid researh tool with missing data

Hi guys, During my M.A thesis i've developed a research tool to measure Urabnic gentrification. The tool is build of 10 items - all of them are...

• Replies: 3
• Views: 1,892
11-14-2011, 11:29 PM
33. ### Comparing two variable datasets

Hello, I would like to see if two 2-dimentional datasets are the same, my data consists of two groups of xy data - the data is not linearly...

• Replies: 0
• Views: 2,349
bjj
01-13-2017, 02:25 PM
34. ### Mann Whitney vs. two tailed t-test

I am new to statistics and am in need of some help. I am running a study where I am providing two groups with surveys to test for their perceptions...

• Replies: 0
• Views: 3,084
03-22-2013, 10:33 PM
35. ### Confusions regarding Regression, Multicollinearity and Factor Analysis

I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

• Replies: 2
• Views: 3,132
01-29-2013, 03:18 PM
36. ### Hot deck imputation issues

Background: I had a data set containing 212 observations with a lots of missing values. Most of the IVs and DVs are categorical (DVs are ordinal)...

• Replies: 0
• Views: 1,505
01-28-2013, 02:12 AM
37. ### How to develop a health coverage plan for a particular disease?

Currently, there is no government health coverage for cancer in our country and the prevalence of this disease is increasing rapidly. So I have...

• Replies: 0
• Views: 699
05-27-2017, 08:18 AM
38. ### HLM-Longitudinal Analysis: Moderation in level 2 variables?

Hi, I am creating a growth model using HLM 7 where Level 1 is Occasion and Level 2 is Person. I am trying to see if I can test the moderation...

• Replies: 0
• Views: 2,983
12-11-2012, 07:11 PM
39. ### What kind of ANOVA is good for this

Hello, In my research i've collected death % for cell cultures. One variable was the treatment used (0,2,4,10,16 exposure). Another one was the...

• Replies: 3
• Views: 2,631
08-17-2014, 01:53 PM
40. ### Help with inter-rater reliability

Hi all, I've got a set of data that I need some advice on. I'm working on a pilot project where a group of four people evaluate essays. The way that...

• Replies: 14
• Views: 3,797
09-07-2012, 05:13 PM

Alright, so honestly, I've actually looked up in both my textbooks as well as online tutorials for simplified explanations as to how I can solve the...

• Replies: 0
• Views: 2,252
11-17-2008, 12:18 AM
42. ### This may be extraordinarily easy

I don't know which is why I am asking here on this forum. We are in the middle of a debate and I have absolutely no idea whatsoever of what the...

• Replies: 1
• Views: 2,325
03-14-2011, 06:19 PM
43. ### KS or Wilcoxon?

I have some survey data which I want to analyse using non-parametric test. It is a single sample (approx. 100) It is ordinal - likert scale e.g....

• Replies: 4
• Views: 5,810
04-21-2011, 01:37 PM
44. ### 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: 9,049
04-19-2013, 12:12 PM
45. ### Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

• Replies: 2
• Views: 1,902
04-18-2013, 05:20 PM
46. ### Significance aside - correlation coefficient

Hi everyone: It's been a while since I have posted here and I hope that I am posting in the right forum. In my field, sometimes people like to...

• Replies: 6
• Views: 1,689
08-15-2014, 08:48 AM
47. ### Research Design

Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

• Replies: 9
• Views: 4,006
02-15-2011, 09:15 PM
48. ### Online-estimate of squared correlation coefficient for linear optimization

Summary: Is there a way to directly estimate the squared correlation between two zero-mean Gaussian variables on-line and without storing more than...

• Replies: 0
• Views: 1,792
03-28-2013, 03:36 PM
49. ### Help - problem

Hi I have a variable VA and want to know if there are significant differences in this variable between group A and group B. N = 93 samples...

• Replies: 1
• Views: 2,281
06-17-2009, 10:15 PM

I have a research project and I am really confused on what I should do with the data. I asked people to complete a survey. The survey had 10...

• Replies: 1
• Views: 1,576
04-29-2011, 04:26 PM
51. ### Chi Square - confused which variables to use.

Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

• Replies: 4
• Views: 3,122
11-14-2011, 08:38 AM
52. ### Assistance with Statistical Methodology to address research problems

Im looking for some help with a statistical method(s) that can support the research questions i am looking to answer. I am basically doing research...

• Replies: 1
• Views: 1,482
01-15-2013, 04:08 PM
53. ### Help with analysis

Hi All, I am new to the forum. I have a specific question regarding one of the behavioral experiment we are conducting. This experiment is...

• Replies: 0
• Views: 1,434
02-12-2012, 11:30 AM
54. ### Ratios of dependent variables

Hello, I am conducting some research into tool marks. I have two sets of tool marks (A) and (B). I am trying to ascertain whether the tool...

• Replies: 3
• Views: 1,509
01-22-2013, 10:08 AM
55. ### How to get p-value with categorical dependent var and nominal independent var

Hi, I'm familiar with most of the univariate tests for significance (chi-square, t-test, 1-way anova, etc.) but I was stumped today. Which test do...

• Replies: 1
• Views: 3,791
07-19-2011, 08:37 PM
56. ### Random Sampling in Mixed Models

Hi, I have a data set that contains 40 firms over 15 years with firm and individual level data, with the individuals being sample randomly from...

• Replies: 0
• Views: 846
08-06-2014, 05:48 PM
57. ### Analyse unemployment rate and public expenditure on active labour market policies?

Hello everyone, I have a data set of OECD. I would like to analyse the relation between this two indicators: the relation between unemployment rate...

• Replies: 0
• Views: 1,178
01-17-2014, 01:12 PM
58. ### Difficulty with Rank-biserial correlation coefficient, N = 5

Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

• Replies: 6
• Views: 7,810
01-22-2012, 08:49 PM
59. ### Controlling for familywise error for large correlations matrix

Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

• Replies: 0
• Views: 1,785
02-19-2012, 05:21 PM

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