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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: 18,728
10-11-2014, 12:02 PM
1. ### Multinomial logistic regression

I have been carrying out some analysis using multinomial logistic regression and I would like to compare two competing models to see which is the...

• Replies: 2
• Views: 3,962
06-29-2008, 08:07 AM
2. ### Requesting Jenks natural breaks algorithm for Statistica

Hello forum, I am studying particle size distributions and have been advised to locate an R algorithm/routine to implement Jenks natural breaks...

• Replies: 1
• Views: 3,960
10-21-2010, 04:52 PM
3. ### Likert scale analysis

Hi all! I want to ask that i have likert scale questionnaire with 6 points scale. If i am going to analyze using as interval data, that means i have...

• Replies: 0
• Views: 3,945
02-15-2011, 08:13 AM
4. ### Comparing distributions

I'm working on analyzing data for a prof for publication and have come to a situation that I am lacking confidence in and am coming here for help. ...

• Replies: 12
• Views: 3,940
05-21-2012, 10:28 AM
5. ### Which test to use for my data

Hi, I am not sure which kind of test to use to analyse my data. Can anyone help? I collected 50 snails from 5 different sites & dissected to find...

• Replies: 24
• Views: 3,936
04-22-2013, 02:07 AM
6. ### Need help with Multiple Imputations ("pooled" dataset)

Hello everybody, My original data set (n=901) contains missing values (10-20% per variable). I am applying Multiple Imputations technique using...

• Replies: 8
• Views: 3,934
06-23-2014, 02:07 PM
7. ### Question: making a positive case for "no effect"

I have the results of a basic web-based marketing test. Visitors were randomly sent to one of several pages with a binary outcome of "sale" or "no...

• Replies: 7
• Views: 3,933
10-26-2009, 03:23 PM
8. ### Comparing two distributions using random drawing.

Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

• Replies: 7
• Views: 3,930
09-18-2011, 08:11 AM
9. ### what to do for unknown PDFs.

Hi guys 1) When we are performing signal detection , and we have received this y(n)=x(n)+z(n) for n=0,1,2,3...., where z is gaussian noise, but...

• Replies: 0
• Views: 3,930
04-12-2011, 10:59 PM
10. ### Principal components interpretation

I have principal components based on correlation matrix. Statistica PCA method report outputs not only factor loadings that depend on components'...

• Replies: 5
• Views: 3,929
10-24-2008, 04:26 AM
11. ### Factor Analysis help--Senior Thesis

I am an undergraduate and working on my senior research project. I am doing a study of the construct validity of a critical thinking test using...

• Replies: 2
• Views: 3,929
11-30-2008, 07:50 AM
12. ### normalization for detection of outliers

Hello everyone, I am working with a huge dataset and I'm trying to find outliers in each row for two subgroups of my dataset (G1 and G2)....

• Replies: 0
• Views: 3,926
10-20-2011, 08:59 AM
13. ### Linear regression using compositional data as independent variables

I have a set of ratios that the sum results in 100% (compositional data in other words). These 7 variables need to be implemented in a linear...

• Replies: 2
• Views: 3,923
03-07-2014, 12:04 PM
14. ### Comparing the mean of top and bottom quartiles

Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

• Replies: 2
• Views: 3,907
02-08-2012, 12:45 AM
15. ### Ideas with paired data

Yesterday I was lucky enough to work with a statistician from another section in my division. He took me along on one of the consultations he...

• Replies: 5
• Views: 3,906
08-31-2011, 04:45 PM
16. ### Help needed with Multiple Correspondence Analysis

Greetings, I am looking for resources (books, websites, articles) that can help me, in the simplest way possible (i.e. step by step), figure out...

• Replies: 2
• Views: 3,904
07-05-2011, 06:54 PM
17. ### Regression Model

wefwefwfweff

• Replies: 3
• Views: 3,903
06-04-2010, 09:04 AM
18. ### F-value and Post-hoc tests conflict

What does it mean when you obtain a significant F-value for an ANOVA but when you perform the post-hoc test no pairwise comparisons are significant?...

• Replies: 0
• Views: 3,890
07-17-2009, 02:40 PM
19. ### Probability Mass Functions

I am having some trouble on understanding some problems on my practice exam. The prompt is: Let X1 and X2 have (the same) probability mass...

• Replies: 1
• Views: 3,889
BGM
10-12-2011, 10:53 PM
20. ### "Uninformative" priors paradox?

Bayesians, puzzle me this: If you are trying to learn the $p$ parameter of a binomial distribution, the least informative prior is the uniform...

• Replies: 1
• Views: 3,886
10-21-2010, 10:55 PM
21. ### Minimum sample for a t-test independent samples

I have a sample which consists of 2 treatments and 15 unique samples. Data are interval. It was obtained by measuring arguments in similar pages from...

• Replies: 5
• Views: 3,881
12-30-2011, 11:59 AM
22. ### [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: 3,877
02-24-2016, 08:58 PM
23. ### variables that are not independent of each other

What are some ways this dependency is modeled with statistical methods?

• Replies: 5
• Views: 3,874
07-16-2010, 05:03 PM
24. ### Estimation Maximization

Hello everybody! I have a general question concerning Estimation Maximization (EM): I understand from literature research, that EM is not possible...

• Replies: 3
• Views: 3,873
11-18-2013, 05:19 AM
25. ### Time series: Research paper - VAR modeling

Hi everyone, I am conducting a statistical research using VAR modeling. So my plan is to conduct a 4-variable VAR(2) on the following: 1)...

• Replies: 0
• Views: 3,864
05-21-2011, 10:09 AM
26. ### How to classify data into group?

I have collected warehousing cost data from 200 companies...and then converted to % There are 200 data (lowest from 1.5 % to highest of 40 %). My...

• Replies: 5
• Views: 3,860
06-05-2012, 07:54 AM
27. ### Spearman's Rank Correlation P value on Minitab

Hi there, im doing a project on the relationship between plant height and their nearest neighbour. As i couldn't normalise the data i've opted to use...

• Replies: 0
• Views: 3,859
02-29-2012, 08:50 AM
28. ### Combining outcome scores: standardising case and control data

Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

• Replies: 0
• Views: 3,852
09-05-2010, 08:02 PM
29. ### Using chi-squared test for goodness of fit for different sizes of sample?

Firstly, apologies if I'm posting this in completely the wrong place. I'm trying to figure out a way to allow for different sized samples when...

• Replies: 1
• Views: 3,842
10-28-2011, 03:34 PM
30. ### Can you assign new observations into existing clusters?

Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

• Replies: 5
• Views: 3,837
07-07-2014, 03:45 PM
31. ### Violation of sphericity...

If you seem to be violating the assumption of sphericity when undertaking several separate one way repeated-measures ANOVAs and therefore have to...

• Replies: 0
• Views: 3,831
08-20-2009, 03:26 PM
32. ### 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: 3,829
09-24-2008, 02:35 PM
33. ### Common method variance

Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

• Replies: 2
• Views: 3,822
03-03-2011, 08:52 PM
34. ### 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: 3,812
09-07-2012, 05:13 PM
35. ### Joint Probability From Correlation Function

Dear all I have the following problem. Given a set of correlated binary variables, can I determine the joint probability from the correlation...

• Replies: 3
• Views: 3,797
07-18-2013, 03:14 AM
36. ### 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: 3,797
07-19-2011, 08:37 PM
37. ### Weighting by sample size/confidence intervals in regression analysis?

Hello, I am conducting an analysis of how a gene frequency (technically allele frequency) correlates with certain ecological variables (mainly...

• Replies: 0
• Views: 3,793
07-24-2008, 10:33 PM
38. ### Using Linear slope estimate as independent variable in regression analysis

Hi all, I am doing an analysis of longitudinal growth data and would like to compare my methods to other studies but am having trouble finding...

• Replies: 0
• Views: 3,793
07-15-2009, 01:01 AM
39. ### Subsampling to obtain a p-value

Hello everybody! This is my first post in this forum, I hope you guys have some ideas for me :) I have ~2000 measurements, namely angles, which...

• Replies: 5
• Views: 3,792
10-07-2011, 12:57 PM
40. ### Significant Difference with 2 vars

Hi everyone, Is it at all possible to determine if a group of points on a scatterplot are significantly different from another group of points? ...

• Replies: 7
• Views: 3,783
06-25-2010, 11:03 AM
41. ### what is the difference between latent class analysis and factor analysis?

I read some papers and most of them used EFA/SEM, and one paper used LCA (latent class analysis). So, when do you need to use LCA but not FA? It...

• Replies: 2
• Views: 3,781
06-22-2015, 05:04 PM
42. ### ANOVA of factor analysis results

Hello, new to the forum, and I'm in a bit of a bind with some data analysis for my thesis. I have conducted Principle Axis Factoring (using SPSS,...

• Replies: 0
• Views: 3,777
02-01-2011, 12:39 AM
43. ### Office for National Statistics YouTube channel

The Office for National Statistics has recently launched a new YouTube channel explaining some of the stories about their statistics. Its a new...

• Replies: 0
• Views: 3,772
03-03-2011, 05:31 PM
44. ### statistical power of a General Linear Mixed Model with repeated measurements

Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

• Replies: 0
• Views: 3,771
04-15-2009, 07:37 AM
45. ### Finding relationship between 2 curves over time

Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

• Replies: 1
• Views: 3,770
03-11-2009, 05:40 PM
46. ### Interpretation of Factor Analysis

I have a doubt on how to interpret the factor score output? Suppose we have data in 7 columns: Recommendation, Preference, Willingness to pay...

• Replies: 0
• Views: 3,768
01-30-2011, 08:46 AM
47. ### Identify the causes for a phenomenon

Hi everyone. I would like to investigate the relationship of different factors to a phenomenon. Saying I have traffic accidents (1 or 0) with...

• Replies: 0
• Views: 3,766
11-26-2013, 08:39 PM
48. ### Scaling technique

A friend of mine, a Ph.D. student, seeks my advice on the appropriate scaling technique that can be used for his research. The research involves...

• Replies: 0
• Views: 3,762
03-25-2009, 04:10 AM
49. ### might be a stupid question...

I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

• Replies: 2
• Views: 3,755
03-16-2009, 11:07 AM
50. ### single Likert scale question analysis

I work for a holiday company which uses a 7 grade Likert scale questionnaire to collect feedback from our guests. This is my first foray into...

• Replies: 2
• Views: 3,751
09-08-2011, 03:57 AM
51. ### survey weighting and calculation of confidence intervals for proportions

Hi all I'm working with data from a one-off cross-sectional random sample survey that has weighting that can be applied to make it representative...

• Replies: 0
• Views: 3,750
08-07-2012, 04:20 PM
52. ### On the history of MANOVA's null hypothesis...

hey everyone! this is kind of a different topic from the "how-to-analyze-my-data" questions, but i think it's kind of relevant. anyways, so my...

• Replies: 0
• Views: 3,742
01-30-2011, 09:15 PM
53. ### Power calculation in Critiquing Tool

Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely...

• Replies: 1
• Views: 3,742
02-13-2012, 02:20 PM
54. ### 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: 3,722
01-27-2011, 04:20 PM
55. ### Probability of Events in Equations

Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

• Replies: 3
• Views: 3,722
12-12-2016, 09:48 AM
56. ### One sample t-test: help needed

Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

• Replies: 8
• Views: 3,720
11-22-2010, 08:42 AM

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