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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: 18,772
10-11-2014, 12:02 PM
1. ### Using an Independent t-test with Pre/Post data

Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

• Replies: 6
• Views: 4,578
02-08-2012, 08:10 AM
2. ### Im struggling -What post-hoc analysis tests?

Hi Guys I’m new here and really hope you can help me out! I’m having a struggle with some research data and have done the first part of some...

• Replies: 6
• Views: 5,133
02-20-2012, 12:30 PM
3. ### Categorical data goodness of fit question

Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

• Replies: 6
• Views: 3,580
szm
02-21-2012, 06:20 PM
4. ### Likert Scale

Hi! Can you help me with my stat research problem? what is the difference between 3-point likert and 5-point likert scale? which is better to use and...

• Replies: 6
• Views: 17,337
03-08-2012, 05:37 AM
5. ### ANOVA with subject id's as variables?

Hi everybody, I work in sleep research and it is usually of interest to us to compare variables between different sleep stages (wakefulness, N1,...

• Replies: 6
• Views: 2,559
03-27-2012, 04:01 PM
6. ### Missing Data

I used an original survey form to collect data and afterwards realized that the final copy of that survey included a question that was not on the...

• Replies: 6
• Views: 2,028
03-21-2012, 09:22 PM
7. ### 10 point scale and central limit theorem

I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

• Replies: 6
• Views: 2,716
04-03-2012, 05:20 AM
8. ### Determining which data set is most like another

I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

• Replies: 6
• Views: 1,757
04-27-2012, 02:08 PM
9. ### Suggested form of statistical analysis?

I appreciate the feedback so far. Now, I'm wondering what type of statistical analysis I CAN do with a large amount of data that is pretty important...

• Replies: 6
• Views: 1,579
05-15-2012, 02:14 AM
10. ### What type of sampling is this?

Hi, I have some confusion about the kind of sampling I'm using. I started choosing manufacturing sector and within it chose 4 industries. Later I...

• Replies: 6
• Views: 2,294
06-21-2012, 10:30 PM
11. ### 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: 1,810
09-06-2012, 03:56 PM
12. ### Parametric / Non-parametric...

Hi Everyone, I have a dataset that looks something like this: gene1, occurence in tissue 1 / condition A, 1 / B, 1 / C, 2 / A, 2 / B, 2 C....

• Replies: 6
• Views: 2,366
08-15-2012, 01:06 PM
13. ### Comparison of the power of the tests: Parametric test versus Non-parametric test

How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric...

• Replies: 6
• Views: 4,768
08-26-2012, 04:23 PM
14. ### t-test or Mann-Whitney test, regular research problem, need help

Hello, it looks like a most frequent research problem, but I am confused, so need help. I have 2 groups of data to compare: group 1 - people...

• Replies: 6
• Views: 12,021
10-09-2012, 06:01 AM
15. ### Missing Data Analysis Question

Hi gurus, I really appreciate some advise on handling missing values. Briefly, subjects rated 21 objects (obj 1 ...obj 21) on 14 attributes...

• Replies: 6
• Views: 2,009
10-18-2012, 09:26 AM
16. ### How to test a hypothesis comparing two sets of likert item data

Hi, I want to test a hypothesis but my two variables use likert item data and I don't know if they can be tested together. For example, Q1....

• Replies: 6
• Views: 2,857
11-29-2012, 03:38 AM
17. ### Modeling Rate Of Arrival At An Event

I'm trying to model the rate at which people arrive at a football match. I have throughput data from about 20 matches showing the number of people...

• Replies: 6
• Views: 1,608
11-27-2012, 11:51 AM
18. ### Average minute rating can be modeled by poisson?

Dear All, Here is my question with an example. I am trying to understand the tv channel rating data. The data measures the tv watchers...

• Replies: 6
• Views: 1,174
11-28-2012, 11:57 AM
19. ### abnormal data, log transform data, still abnormal, what to do?

Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

• Replies: 6
• Views: 2,567
06-20-2013, 02:19 PM
20. ### LGC with Experimental Manipulations

Hey gang, first time posting. So, I have 9 time points of continuous learning data for 200ish people. I also have two manipulations (thus the 200...

• Replies: 6
• Views: 1,800
12-17-2012, 11:49 AM
21. ### Correlation vs ANOVA

Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

• Replies: 6
• Views: 12,787
01-23-2013, 04:18 PM
22. ### Which test to use for my data? Thanks

Hi all, I have unequeal sample sizes so I am a little lost as to which test to use for my data. I have a total of 113 patients with one group being...

• Replies: 6
• Views: 1,477
04-16-2013, 07:27 AM
23. ### unbiased estimators

in order to estimate the area of a squared field, two independent measures were taken of one of the sides: X1 and X2 two estimators were...

• Replies: 6
• Views: 2,257
03-05-2013, 11:57 AM
24. ### 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: 2,465
06-12-2013, 10:39 AM
25. ### What test to identify words used more frequently by one group than another?

I have two groups of subjects, A and B. I have a text sample produced by each subject. My goal is to idenitfy those words that are used significantly...

• Replies: 6
• Views: 1,618
07-29-2013, 03:23 PM
26. ### Can you estimate the power of a test by simulating data?

I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

• Replies: 6
• Views: 1,643
07-06-2013, 06:31 PM
27. ### Moderated Mediation Macro Limitations

Hello! I am currently working on my thesis and my data seems to fit a moderated mediation model but I'm up against some of the MODMED limitations....

• Replies: 6
• Views: 3,119
07-13-2013, 05:43 PM
28. ### Paramedic Research - Need help!

Hello all, I have come across your forum after trying to source some statistic knowledge. I am currently planning a research project which I am...

• Replies: 6
• Views: 1,305
12-08-2013, 11:26 AM
29. ### Which statistical test to use, 20 subjects, 6 categorical variable, 4 parameter

Hi I have an experiment and are not sure which statistical test I should use. I hope some of you can help me, as this is not my strong side.. I...

• Replies: 6
• Views: 1,626
02-11-2014, 12:57 AM
30. ### 1 observation for control group & 3 obs for experimental group

Hello, My background in statistics is quite limited, so I'm searching for help in order to choose which test I should use for my research. I am...

• Replies: 6
• Views: 1,634
03-11-2014, 03:05 PM
31. ### Meta-analysis: How should one handle non-significant studies containing no raw data?

Let's say that I'm conducting a meta-analysis, looking at the performance of group A and group B with respect to a certain construct. Now, some of...

• Replies: 6
• Views: 2,209
03-26-2014, 08:22 AM
32. ### Any stats tests I can run to show inconsistency/ no correlation?

Hi, I am doing my msc dissertation and I have gathered 204 responses to a questionnaire with one of the main questions being what exercises specific...

• Replies: 6
• Views: 1,605
06-06-2014, 06:13 PM
33. ### Top AIC model with no significant parameter estimates

Hello, I am working on a project in which my top model has normal looking standard errors, but all of the parameter estimates overlap zero,...

• Replies: 6
• Views: 1,847
07-24-2014, 08:23 AM
34. ### Having a hard time deciding on what test to use for data

Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not...

• Replies: 6
• Views: 1,873
07-28-2014, 02:05 PM
35. ### GLMM - fitting random effects to a complex field design

Dear forum users, I’d be very grateful to hear about any opinions on a problem I’m having with the random effects side of my generalised linear...

• Replies: 6
• Views: 2,113
08-03-2014, 05:07 AM
36. ### 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: 1,697
08-15-2014, 08:48 AM
37. ### Correlation between non-independent variables

Hi, I want to conduct correlation between two variables, that have common term (difference scores). Originally there are three variables X, Y,...

• Replies: 6
• Views: 2,892
09-24-2014, 11:15 AM
38. ### Relative Risk calculation

Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

• Replies: 6
• Views: 2,744
10-06-2014, 04:41 PM
39. ### Can anyone help me choose appropriate form(s) of analysis?

Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

• Replies: 6
• Views: 2,789
10-23-2014, 03:35 AM
40. ### How to test data if it is normal distribution in spss ?

Hello Good morning guys i will need some help truly i have variables in spss most of them scale type, some of them are nominal, and few are...

• Replies: 6
• Views: 3,148
11-18-2014, 03:01 AM
41. ### Basic ANOVA question

We had individuals fill out a survey where they assign importance to five categories. So for example: if given \$1000 to distribute among five...

• Replies: 6
• Views: 2,220
11-18-2014, 05:22 PM
42. ### What's the correct correction factor? Multiple one-sample and paired tests...

This question concerns the chance of Type I error in hypothesis testing with multiple statistical tests. The data come from a series of experiments....

• Replies: 6
• Views: 2,933
11-28-2014, 08:13 PM
43. ### Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

• Replies: 6
• Views: 1,558
01-28-2015, 02:46 PM
44. ### Raw Data vs Frequency Distribution

Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

• Replies: 6
• Views: 5,925
05-11-2015, 07:48 AM
45. ### Statistical Analysis for Master's Thesis

Hello Everyone, So this is my first forum post ever :) probably because I just couldn't figure out solution by myself this time. Thank you in...

• Replies: 6
• Views: 1,784
08-18-2015, 06:34 PM
46. ### Census data: Should I worry about sample size and pvalues?

Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

• Replies: 6
• Views: 1,601
06-07-2016, 08:22 AM
47. ### Population Estimation

Hello, new member here and I've been looking for a way to make a number cruncher for a (imaginary) colony of creatures for an RP I'm making. I'm...

• Replies: 6
• Views: 2,382
06-16-2016, 08:05 AM
48. ### Estimating the number of cases (sample size)

Hi there! I've a perhaps simple question: how can I estimate the number of measurements (cases) to obtain a accurate result? Here an example:...

• Replies: 6
• Views: 1,390
07-17-2016, 11:00 PM
49. ### Generalised Lambda Distribution

Hello, Can anyone help me, I am trying to use the Generalized Lambda distribution to model some parts in an assembly, but apart from Wikipedia...

• Replies: 6
• Views: 254
10-17-2017, 01:33 PM
50. ### 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: 7,505
07-31-2008, 04:08 PM
51. ### 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: 4,226
08-28-2008, 11:18 AM
52. ### simple regression question (I think)

Hi there, Suppose I have the simple libear regression model: Y=a0+a1*X+ε where ε~N(0,σ^2) Suppose that via least squares I estimate a0...

• Replies: 5
• Views: 3,836
09-24-2008, 02:35 PM

Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

• Replies: 5
• Views: 6,511
10-06-2008, 07:40 PM

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