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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: 19,452
10-11-2014, 12:02 PM
1. ### 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: 2,652
01-07-2014, 04:56 PM
2. ### Sample size | Johnson SB distribution

I have some statistical notions but from one day to the other i was asked to do an analysis that i hope you guys can help me with, since i have no...

• Replies: 1
• Views: 2,510
01-07-2014, 09:55 AM
3. ### Help with Probabilistic Modeling with many elements in simulation with unknown probs.

I'm wanting to create a probabilistic model based on several simulations, where I have a binary outcome (go or no-go) and a variable input. The old...

• Replies: 1
• Views: 1,319
01-06-2014, 04:08 PM
4. ### use of linear predictions from ordered probit as right-hand side variables

Hi all, Does anyone know if it is OK to use an ordered probit model to predict a latent variable, e.g. self-perceived health; and then use the...

• Replies: 0
• Views: 1,422
01-06-2014, 10:19 AM
5. ### Analyzing Multiple Regression - Comparing to Simple Regression

I am working on a paper where the methodology was already approved. I know it isn't the "best" way to analyze my question but I am moving forward...

• Replies: 0
• Views: 1,409
12-31-2013, 11:13 AM
6. ### How To Compare And Interpret Output In Cluster Analysis?

Good Day! I'm currently making my thesis and I'm already on the chapter of analyzing my research findings. I'm using cluster analysis specifically...

• Replies: 0
• Views: 1,888
12-31-2013, 03:37 AM
7. ### Factor analysis question

Hi, I was hoping somebody might be able to help with a question about factor analysis. Is there a problem with putting three different groups (of...

• Replies: 1
• Views: 1,490
12-30-2013, 12:42 PM
8. ### What statistical test should I use for this data?

Two groups (group A; group B) are given two treatments (M) and (B), and a control (Control) in different orders. Then the weight of food they consume...

• Replies: 1
• Views: 2,022
12-30-2013, 10:46 AM
9. ### Statistical justification for Cochrans Q please

Please may someone tell me the proper way to write a statistical justification for a Cochrans Q .. By any chance is it the same a t-test? ...

• Replies: 4
• Views: 1,520
12-29-2013, 06:57 PM
10. ### A question regarding correlation and regression for a seminar

Hello, Im doing a seminar in which the dependent variable is work centrality which is an interval one. the independent variable is age (ratio),...

• Replies: 1
• Views: 3,291
12-25-2013, 04:01 AM
11. ### Market potential evaluation

Objective- evaluate telecom market potential of 40 locations and accordingly rank them based on highest potential. Parameters used: population, my...

• Replies: 1
• Views: 1,988
12-23-2013, 12:11 PM
12. ### Crossover design or Randomised Block Design?

I have two groups of rats (group A and group B). 'Pretreated' means they were injected beforehand (with either memantine or saline). They were then...

• Replies: 2
• Views: 1,546
12-22-2013, 07:15 PM
13. ### Correlation testing of survey results

Hi there, hopefully this is posted in the right section. If not, I apologise. I have been helping out a local charity to compile and analyse a...

• Replies: 0
• Views: 1,003
12-22-2013, 03:05 PM
14. ### BMA (Bayesian Model Averaging ) or a classic fixed effects macro panel ?

Hey folks I would like your opinion..So I need to decide between a BMA (Bayesian Model Averaging ) or a classic fixed effects macro panel in order to...

• Replies: 0
• Views: 1,082
abc
12-22-2013, 01:55 PM
15. ### Is Wilcoxon Sign Rank the appropriate test?

Hi - could anyone help me with this please? I am trying to choose the best statistical test for a problem I have - I am looking at rainfall...

• Replies: 1
• Views: 1,320
12-20-2013, 04:39 PM
16. ### Methodology for Sample sizes for surveys to multiple branches of a credit union

Hi, I am reviewing the methodology for sample sizes for surveys that are mailed out to credit union members on a monthly basis. Please forgive...

• Replies: 0
• Views: 1,140
12-19-2013, 03:36 PM
17. ### Type of Stats

I am new at this - I have to design - on paper - a test to teach reading. I want to do a Pre-Test and Post-Test - compare the differences. I also...

• Replies: 1
• Views: 2,116
12-17-2013, 05:37 PM
18. ### contingency table

I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three...

• Replies: 0
• Views: 1,951
12-17-2013, 12:22 AM
19. ### What statistical test do i need to run?

Hi there folks, I'm having a little difficulty choosing what statistical test i need to run, I've conducted a series of behavioural experiments,...

• Replies: 0
• Views: 1,239
12-16-2013, 06:56 PM
20. ### ANOVA: )Genre of Series (IV) +Gender (Moderator) effect on Purchase Intention (DV)

Hey, In my research I have as IV the Genre of the series (comedy vs drama). The moderator is Gender. And I want to see how this effects purchase...

• Replies: 4
• Views: 1,543
12-16-2013, 11:21 AM
21. ### Bonferroni correction in multiple linear regressions: HELP NEEDED

Hi, I'm running the following regression in R for 16000 promotors and one Phenotype (let's say Systolic Blood Pressure, RR_sys): lm (RR_sys ~...

• Replies: 0
• Views: 2,761
12-14-2013, 08:01 AM
22. ### R packeg of gamm4 mgcv

• Replies: 3
• Views: 2,061
12-13-2013, 07:25 AM
23. ### Calculate the r-squared in models with more than one predictor/variable? TRICKY!!!

Hi there! CAREFUL, my question isharder than it seems! Ok, we all know that r-squared is : one minus (the sum of squares of the residuals...

• Replies: 0
• Views: 1,403
12-13-2013, 05:32 AM
24. ### multiple categorical DVs (binary) for repeated measures?

Dear all I have been looking for ages but I just cant seem to find the appropriate test (in SPSS) for my data... There are two parts to my...

• Replies: 0
• Views: 1,517
12-09-2013, 04:20 PM
25. ### Beta error

Hey guys I really need help from you to calculate the beta error of two different samples. The values are: Average rate of the first sample:...

• Replies: 0
• Views: 714
12-09-2013, 09:08 AM
26. ### 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: 1,349
12-08-2013, 11:26 AM
27. ### Age and DNA methylation data: HELP NEEDED

I have data on patient Age as well as change in % DNA methylation levels for promotor regions. I seek to understand the impact of Age on the % change...

• Replies: 1
• Views: 1,597
12-08-2013, 11:21 AM
28. ### Help Please - Multi-Dimensional Interpolation Analysis

Hi all, I am currently working on a problem that involves a lot of statistics and probability. Unfortunately I have limit expertise in both these...

• Replies: 0
• Views: 883
12-06-2013, 12:47 PM
29. ### Question about sample size and margin of error

I am trying to determine if my dataset sample size is large enough to be statistically significant. I'm using a 95% confidence interval. However,...

• Replies: 3
• Views: 1,584
12-06-2013, 02:46 AM
30. ### Need help determining sample size

Hi, I've been asked to analyze a tool that gives out quotes to our customers. There was feedback that some of the quotes are wrong and the team...

• Replies: 1
• Views: 1,188
12-06-2013, 02:31 AM
31. ### Poll: Poll: ANOVA and Missing Data... what to do?

basic set up. student shows up at your office with the all-too-common problem of having an unbalanced factorial ANOVA design and asks you what to do....

• Replies: 1
• Views: 1,343
12-05-2013, 03:01 PM
32. ### Kaplan Meier and Log Rank

Hi all, I am doing cognitive testing and the subjects have 20 possible trials to reach criterion (90% accuracy). In my spreadsheet, I have it laid...

• Replies: 0
• Views: 1,034
12-05-2013, 09:41 AM
33. ### Two sample inference.

Hi guys, Please help me with this problem. Two types of plastic is suitable for the use by an electronic component manufacturer, The braking...

• Replies: 2
• Views: 1,264
12-05-2013, 02:49 AM
34. ### Help with problem for exam, Inference, two sample.

Hi guys please help me. In an effort to enhance the future reaearch performance, the university decided to classify the academic staff based on a...

• Replies: 0
• Views: 1,076
12-04-2013, 05:51 AM
35. ### Regression Assumption

Why do you need to meet the homogeneity of regression assumption in ANCOVA? If this assumption violates so what happens?

• Replies: 0
• Views: 1,661
12-04-2013, 04:42 AM
36. ### Statistically significant variable in MANOVA calculation -- how do I find the effect?

I ran a MANOVA analysis followed by a univariate analysis on the individual variables in the MANOVA -- predictor variables were Condition and...

• Replies: 0
• Views: 1,905
12-02-2013, 10:32 PM
37. ### A simple case that doesn't seem that simple

I've been trying to find the best solution for my experiment. I don't like that much what my colleagues are using for the statistic test here. So I...

• Replies: 5
• Views: 2,292
srd
12-02-2013, 10:34 AM
38. ### What statistical analysis or methods to use?

I'm trying to learn a bit here and I'm experimenting on some data I have available. The data is user records with data appended to each record that...

• Replies: 0
• Views: 1,280
12-02-2013, 10:11 AM
39. ### Test-retest duration

Hi Hi everyone. I'm new here. I have a problem here. I just finished my 1st pilot study on my instrument(questionnaire) and I would like to run...

• Replies: 2
• Views: 1,631
12-01-2013, 02:19 AM
40. ### Confidence intervals vs. Standard error bars

I came across this article discussing the topic of confidence intervals and error bars ib plots and thought I'd share: ...

• Replies: 2
• Views: 2,239
11-30-2013, 11:46 PM
41. ### Comparing the mean of two non-random groups

Students are assigned to group A or B based on two aspects: a grade from an exam and an evaluation of their teacher. Students with both a high grade...

• Replies: 1
• Views: 2,022
11-30-2013, 10:59 AM
42. ### question on Monte Carlo simulation

I have a mean (mu) and its standard error (se) of variable X from the literature. I have a dataset of size n which doesn't have variable X. Now I...

• Replies: 5
• Views: 2,024
11-27-2013, 08:17 AM
43. ### 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: 3,986
11-26-2013, 08:39 PM
44. ### Picking Statistical Analysis - Does Funding Mitigate Impact of Poverty

Hi everyone, Thank you in advance for any help you can provide. I am new to the forum and hope to stick around for a while. I am working on...

• Replies: 3
• Views: 2,053
11-26-2013, 01:12 PM
45. ### Relative importance of predictors in logistic regression

I would like to assess the relative importance of independent variables in a logistic regression model. Previously I have used the 'R' statistic the...

• Replies: 0
• Views: 1,152
11-26-2013, 10:04 AM
46. ### non-mutually exclusive outcomes

Hi, I have 4 outcomes (A B C D) that one of them is calculated as a weighted average of the first 2 (D=0.6*B + 0.4*C). Then I ran ANOVA to...

• Replies: 1
• Views: 1,512
szm
11-25-2013, 11:37 AM
47. ### measuring correlation over time between two variables

Hi, For my study, I will administer the same questionnaire 3 different times: the beginning, middle, and the end of the semester. I am interested...

• Replies: 0
• Views: 2,430
11-25-2013, 07:26 AM
48. ### p-value for nearest neighbor classification

Hi all, For the past few days, I have been trying to compute a p-value for some experiment I ran recently, and I simply cannot figure it out. ...

• Replies: 4
• Views: 3,190
11-24-2013, 03:58 AM
49. ### help needed (PLEASE) on which statistical analysis to use

I am looking at the relationship between attachment in childhood and attachment in adult relationships. Attachment in childhood has been measured...

• Replies: 0
• Views: 1,433
11-22-2013, 03:17 PM
50. ### Searching for data reduc

Hello, I am so confused and so depressed, I hope someone can help. In my Database I have a plenty of datas about 1000 machines. It is to hard to...

• Replies: 4
• Views: 1,294
szm
11-22-2013, 02:48 PM
51. ### Hierarchial or mixed models, Dirichlet priors, modelling and inference help...

Hi, I'm new to Bayesian inference but I have read what I have found about the subject and believe I have an understanding about the basic...

• Replies: 0
• Views: 1,043
11-22-2013, 07:11 AM
52. ### Comparison of the cohen's ds of 2 independent studies

Hello, Is it possible to statistically compare the cohen's d of two studies in order to determine of one of the two Cohen's d is statistically...

• Replies: 2
• Views: 1,763
11-22-2013, 05:41 AM
53. ### When is standardisation of data necessary?

I am running regression analysis and cluster analysis on a data set. The variables differ in their scale of measurement – some variables are ratings...

• Replies: 0
• Views: 1,217
11-20-2013, 03:32 PM
54. ### Standard error of a weighted composite score

I would like to calculate the standard error of a weighted composite score. The composite score is based on the sum of a respondent's rating to a...

• Replies: 2
• Views: 3,316
11-20-2013, 03:10 PM
55. ### standard error of group means (help please)

Hi All, I have the following summarized data: month sample size mean variance weight 1 10 ...

• Replies: 2
• Views: 1,275
11-20-2013, 08:17 AM

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