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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: 18,620
10-11-2014, 12:02 PM
1. ### Is this method to post-hoc determine the sample size a known one?

Hi all! In the last weeks I'm facing the issue of determining if my sample is big enough to describe the world population. Apart from the usual...

• Replies: 3
• Views: 1,817
12-12-2014, 08:16 AM
2. ### how to analyse samples with different distribution?

I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

• Replies: 3
• Views: 1,737
06-20-2014, 07:33 PM
3. ### 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: 4,276
07-08-2014, 12:13 AM
4. ### how to calculate SD or SEM of ratios?

I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

• Replies: 3
• Views: 2,880
07-10-2014, 08:34 AM
5. ### Comparing time curves for two groups in research.

Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

• Replies: 3
• Views: 1,691
07-25-2014, 11:45 AM
6. ### MANOVA versus t-tests : unconsistent results

Hi, here is my problem. I am trying to compare the change on a language measure from time 1 to time 2 between 2 groups. If i do a repeated...

• Replies: 3
• Views: 1,914
07-29-2014, 12:48 AM
7. ### 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: 2,607
08-17-2014, 01:53 PM
8. ### SEM Confidence Intervals and Repeated Measures

I'm analysing data from a repeated measures study. All of my stats tests (ANOVA and non-parametric tests where appropriate) are telling me that the...

• Replies: 3
• Views: 1,747
08-03-2014, 06:43 PM
9. ### Standardizing non-normally distributed data?

Hi everyone, I'm working on a project at the moment that aims to compare subjects based on different characteristics. At the moment, I am looking...

• Replies: 3
• Views: 3,326
08-13-2014, 10:57 AM
10. ### Stores and ordered rank of products

I have data about popularity of some products in some stores. For each of the stores I have only a ordered rank of best-selling products in them. I...

• Replies: 3
• Views: 1,308
08-16-2014, 08:34 PM
11. ### Is this variable ordinal or categorical - which test?

Hi, I'm not sure if this variable classifies as an ordinal or categorical DV, due to this issue I'm havign and therefore, I'm unsure which stats...

• Replies: 3
• Views: 1,882
08-29-2014, 11:22 AM
12. ### Mann-Whitney Test

Hi all, I've got some data that contains dichotomous independent variables and ordinal dependent variables. As a result, I think the only test...

• Replies: 3
• Views: 1,709
08-30-2014, 04:58 PM
13. ### Degrees of freedom for Chi2 normality test

I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a...

• Replies: 3
• Views: 2,870
09-02-2014, 12:49 AM
14. ### non parametric multiple comparison

Hello I am doing statistical analysis on my research data and the data is not normal. So I used Kruskal Wallis test for finding whether treatments...

• Replies: 3
• Views: 3,426
09-23-2014, 01:27 AM
15. ### 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: 1,643
10-27-2014, 03:55 PM
16. ### statistical analysis at the regional level

Hi I wanted to run multivariate analysis on data from regional level (i.e. regional population size, regional indicator values, regional equity...

• Replies: 3
• Views: 1,989
11-19-2014, 10:43 AM
17. ### What should i do after factor analysis output ?

Hello, I am having a construct name trust that includes the following constructs: 1 - Benevolence ( 3 Items) 2 - Integrity ( 6 Items ) 3 -...

• Replies: 3
• Views: 3,186
11-20-2014, 09:10 PM
18. ### noramlization

I weighted the variables to do structural equation modeling (SEM). I found that some weighted variables were not normally distributed. Do I have to...

• Replies: 3
• Views: 1,493
01-10-2015, 01:07 AM
19. ### This might be a simple statistics question, or a really odd statistics question.

I am not a statistics person, so I am not sure if this is a statistics type question or a question that has an answer. I am not sure how best to...

• Replies: 3
• Views: 2,358
01-11-2015, 03:40 PM
20. ### Comparing Likert items. What test should I use?

Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

• Replies: 3
• Views: 1,683
RDW
01-24-2015, 07:59 AM
21. ### General Term for Models with Dependend and Independend Variables

Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

• Replies: 3
• Views: 2,419
01-26-2015, 06:44 AM
22. ### Can Factor Analysis be used for non normal distribution ?

Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

• Replies: 3
• Views: 1,617
04-01-2015, 12:43 PM
23. ### single function of two gaussian distributed variables..

Hi Folks, I have a two 2 dimenstional gaussian function of variables x and y and of their respective standard deviations. I have single valued...

• Replies: 3
• Views: 1,309
03-29-2015, 05:48 AM
24. ### Ordinal Regression vs Spearmans Rank Correlation

Hello, My name is William, I am currently at my last year at Newcastle University, UK carrying out research for my dissertation on how social...

• Replies: 3
• Views: 2,701
04-01-2015, 06:44 AM
25. ### Choosing an appropriate test: MANOVA? ANCOVA? Something else?

I am performing a "dry run" statistical analysis on my dissertation data pretest, and I'm looking for a little guidance regarding the specific...

• Replies: 3
• Views: 1,700
02-18-2015, 04:15 PM
26. ### Logistic or OLS Regression?

I am new to statistics and learning a bit about regression and logistic "regression." The dependent variable for my data set is whether a sports...

• Replies: 3
• Views: 1,417
06-11-2015, 09:07 AM
27. ### Sample size in equivalence trial?

Hey all, For my thesis I need to calculate the sample size for an equivalence trial with four groups (the score on four equivalent forms in order...

• Replies: 3
• Views: 1,637
06-12-2015, 10:21 AM
28. ### What statistical analysis tests to use for these 3 questions

1. Examining the effects of being a victim of violence (categorical yes/no) on hostile attribution scores (continuous variable)? 2. Examining the...

• Replies: 3
• Views: 2,117
07-29-2015, 03:10 AM
29. ### Transformation of panel count variables with multitude of zero values

Hello dear forum members! For a panel of 1,700 physicians observed from 2009 to 2013, my data includes two variables -- number of favorable(fav)...

• Replies: 3
• Views: 1,842
07-20-2015, 04:05 PM
30. ### Research Study

Hello everyone, I would like to ask for help regarding my YES/No Survey. Could somebody me how to compute for this. thanks!!:):):)

• Replies: 3
• Views: 1,647
08-06-2015, 07:50 AM
31. ### Factorial experiment in CRD with unequal replications

Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say...

• Replies: 3
• Views: 1,514
03-18-2016, 06:59 AM
32. ### ANOVA - which one to use?

Hello, we are doing an experiment where body consistence (weight, proportion of muscles, fat, water in body etc.) is measured. We have 103...

• Replies: 3
• Views: 1,631
10-28-2015, 02:38 AM
33. ### statistical test confius

hii... any one need to help me... currently im doing research about pollution.. can any one suggest what test can i do since i using questinnaire...

• Replies: 3
• Views: 1,343
11-06-2015, 06:33 PM
34. ### Which Test for Comparing a Group Pre and Post

A group of people have participated in a program That group of people have completed a questionnaire pre and post program Because it is a...

• Replies: 3
• Views: 1,852
12-18-2015, 07:30 PM
35. ### 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: 2,003
12-12-2015, 09:28 PM
36. ### which reference category for factor variables

Hello, I was wondering if there is any systematic rational of how to decide which category of a factor variable (e.g. level of education -primary,...

• Replies: 3
• Views: 1,370
12-30-2015, 11:51 AM
37. ### How to calculate sample size and effect size for comparing means from two groups

Hi all, hoping i can find some answers here for a bit of a problem i am having regarding a sample size calculation for a study I am soon to conduct. ...

• Replies: 3
• Views: 1,508
01-31-2016, 03:09 AM
38. ### Definition of deflated

Hello guys Do you know what do they mean by "deflated" in the following sentence? "firms reported goodwill impairment loss ( expressed as...

• Replies: 3
• Views: 1,936
02-13-2016, 08:13 PM
39. ### [SOLVED] Option for post-hoc test after permanova for community data?

Hi there, Thank you for reading my post and hopefully someone can provide me with some help! For my master's thesis, I have used microbial...

• Replies: 3
• Views: 3,834
02-24-2016, 08:58 PM
40. ### Reliability and Validity

Hi every body am conducting an educational research, and I've been asked to use statistics in my research!! I used a test in a pre and post...

• Replies: 3
• Views: 1,926
02-21-2016, 01:42 PM
41. ### Time Series - Difference over time

Hello, I'm new in the time series, so I need some help. I have a short time series (5 quarters), with the proportion of a parameter (public...

• Replies: 3
• Views: 2,074
04-15-2016, 02:15 AM
42. ### Principal component analysis (PCA) on clustered data

Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

• Replies: 3
• Views: 1,650
03-21-2016, 03:18 AM
43. ### Confidence Intervals in a research paper

Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

• Replies: 3
• Views: 3,271
03-24-2016, 07:42 AM
44. ### HELP - citation model in R

Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example...

• Replies: 3
• Views: 1,734
09-05-2016, 09:04 AM
45. ### Analyzing Likert Scale Data Using Statistical Tools

Hi everyone, I'm doing an MBA dissertation on the topic "Impact of Customer Service Satisfaction on Business Performance". The hypothesis set is...

• Replies: 3
• Views: 1,613
06-29-2016, 01:50 AM
46. ### Using Factor Scores in Discriminant Analysis

I am doing research on whether corporations that engage in earnings fraud can be identified up to three years before the fraud occurs. My end result...

• Replies: 3
• Views: 818
06-21-2016, 04:40 PM
47. ### Repeated measures - Within/Between explained

Hey guys, I'm having troubles understanding my analysis. I have patients going through pulmonary functions test every 2 weeks in 5 different time...

• Replies: 3
• Views: 1,567
07-16-2016, 08:58 AM
48. ### Influence of a person in repeat measurement (multilevel) or longitudinal data

Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

• Replies: 3
• Views: 1,082
07-08-2016, 11:23 AM
49. ### Probability equation X > number

Long time lurker, first time poster! All help much appreciated! I have one equation being compared to a number: X = any positive real number ...

• Replies: 3
• Views: 1,237
08-29-2016, 07:21 PM
50. ### What type of ANOVA test should I do?

The same participants are exposed to two different screen sizes 27" (stimulus A) and screen size 9.7" (stimulus B). Independent var is "screen" with...

• Replies: 3
• Views: 1,242
08-28-2016, 07:31 PM
51. ### 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: 1,019
08-29-2016, 03:12 AM
52. ### Population estimation

Hi, Just would like to ask for some of your valuable advice! I am working on the project which would like to use the small sample to estimate...

• Replies: 3
• Views: 1,077
09-03-2016, 08:47 AM

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