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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: 18,723
10-11-2014, 12:02 PM
1. ### 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: 3,796
07-18-2013, 03:14 AM
2. ### Ordinal data analysis and hypothesis testing

Hello, I have been working on a survey analysis and have to test hypothesis if the specified kind of software resulted in increased performance of...

• Replies: 3
• Views: 3,343
04-10-2013, 10:56 AM
3. ### 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: 9,099
04-19-2013, 12:12 PM
4. ### Correlations among responses to a forced-choice scale

I have data from participants who rate emotional content of pictures. Specifically, people see 20 pictures of abstract paintings (one at a time) and...

• Replies: 3
• Views: 2,197
04-08-2013, 06:43 PM
5. ### Canonical Discriminant analysis.

Hi everyone :) I am new here. May be my query is too easy for you people but I have no idea how to do that. :confused: :( .Please help me. So my...

• Replies: 3
• Views: 3,654
03-19-2013, 02:54 PM
6. ### about random walk Metropolis algorithm

Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

• Replies: 3
• Views: 2,198
01-06-2013, 07:50 PM
7. ### different test for normality

Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

• Replies: 3
• Views: 2,271
05-05-2013, 12:58 PM
8. ### Can I use standard deviation in Likert scale (1-7) data with non normal distribution?

I have 20 questions, each divided in 6 Likert scale items (1-7), representing 6 different values like Success, Oportunity, etc. The sample is rather...

• Replies: 3
• Views: 4,763
12-31-2012, 05:39 PM
9. ### Multiple regression with correlated predictors to check for explained variance

Hi all, I have two predictive and one response variable and I'm trying to develop a model for predictions. Both predictors fit well (one slightly...

• Replies: 3
• Views: 1,602
01-15-2013, 03:30 AM
10. ### Hosmer_ Lemeshow test

Dear teachers, In SPSS I ran a uniariate logistic regerssion to use the statistically significant ones in the multivariate logistic regression. I...

• Replies: 3
• Views: 2,876
01-17-2013, 05:15 PM
11. ### 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: 1,510
01-22-2013, 10:08 AM
12. ### Bayesian Modeling Question

:rolleyes:

• Replies: 3
• Views: 1,401
02-07-2013, 11:44 PM
13. ### CFA using AMOS: Poor model fit for an instrument

Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

• Replies: 3
• Views: 3,451
10-25-2013, 06:10 PM
14. ### Ideal method of imputation when all variables have missing data?

Need to impute data for a large data set - all variables except 1-2 contain missing data so multiple imputation isn't working well. Any suggestions...

• Replies: 3
• Views: 1,623
02-23-2013, 11:52 PM
15. ### Data Transformations

I'm working with 15 variables or so in a dataset (n=5,000ish) and one of the variables has a strong negative skew to it (skew = -.947, std. error =...

• Replies: 3
• Views: 2,037
04-08-2013, 05:53 PM
16. ### Which statistical test to use for the following scenario?

Firstly, thanks for taking the time to read my post. The scenario: I have 20 novice darts players- split into 5 teams. They're told it's a darts...

• Replies: 3
• Views: 2,287
04-10-2013, 12:33 AM
17. ### [ask] estimate the word "precision" from statistical book by using cluster sampling

hi everyone, i have been a task about how to estimate the word "precision" from statistical book by using cluster sampling. plz help me, i've been...

• Replies: 3
• Views: 1,673
04-23-2013, 07:03 AM
18. ### Average Replicates before Conducting an ANOVA?

If there are multiple replicates of a trial condition, should they be averaged before conducting an ANOVA? For example, I am looking to measure...

• Replies: 3
• Views: 2,171
04-03-2013, 12:49 PM
19. ### Response ratio

Hi there, I want to explore the possibility of using meta-analysis statistics for prediction of various scenarios. I came across a...

• Replies: 3
• Views: 7,308
05-07-2013, 11:10 AM
20. ### Help with choosing right statisical method.

Hi I am new at statistic and am writing my bachelor thesis. I am not really sure how to interpret the statistical significance of my final...

• Replies: 3
• Views: 1,475
06-03-2013, 12:29 PM
21. ### Two questions about normality of distribution

Hello, I have 2 key questions: 1. I have a continuous variable in my dataset which is definitely not normally distributed. I converted the...

• Replies: 3
• Views: 2,017
05-10-2013, 08:44 AM
22. ### How to handle twins in an ROC curve?

Hi everyone, I'm shaping some ROC curves for a study I'm working on, and our dataset is from a twin study. The main model is a LMM that has a...

• Replies: 3
• Views: 1,317
05-28-2013, 03:33 PM
23. ### True mean and the Central Limit Theorem

I've learned some pretty remarkable things about the Central Limit Theorem and the so-called Sampling Distribution of the Sample Mean. But there's...

• Replies: 3
• Views: 1,319
06-15-2013, 04:21 PM
24. ### test of equality of covariance (or correlations) among DISCRETE variables?

i have been trying to find significance tests whose null hypothesis is that the non-redundant, off-diagonal elements of a covariance (or correlation)...

• Replies: 3
• Views: 1,516
06-16-2013, 04:55 PM
25. ### Latent Factors and Dimensionality

Can someone briefly explain to be the difference between factors in a latent sense and a dimensional sense? I've managed to get myself confused and I...

• Replies: 3
• Views: 1,298
07-10-2013, 11:51 AM
26. ### Kendall's Tau with average values of ranked variables

Hi, I have a set of 11 variables with a frequency ranking scale of "never" (1) to "always" (5) + "not applicable". Each variable is a normal step...

• Replies: 3
• Views: 1,363
06-30-2013, 07:23 AM
27. ### Skewed data - what test should I use

Research question: Does wearing a helmet affect head repositioning error in a group of normal participants compared to not wearing a helmet? 3...

• Replies: 3
• Views: 5,733
08-04-2013, 07:08 PM
28. ### A little guideance needed...

First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

• Replies: 3
• Views: 1,962
07-30-2013, 07:15 AM
29. ### Sample size of US prison population....

So, I'm doing research on economic background of people in US prisons and have to collect the data manually so I'm wondering how many I really need...

• Replies: 3
• Views: 2,644
08-12-2013, 07:56 AM
30. ### Analyzing Pooled Likert Data

Hi Everyone, I'm analyzing Likert Survey Responses for a question "How satisfied are you with your Item?" (1 = Very Dissatisfied / 5 = Very...

• Replies: 3
• Views: 1,042
10-01-2013, 08:40 AM
31. ### Ancova

Hello, For an ANCOVA the scores for each group (defined by the levels of the factors) should be normally distributed. Does this apply for the...

• Replies: 3
• Views: 1,321
09-03-2013, 05:08 AM
32. ### R-square and mixed models

What is the best way to calculate the R-square of a linear mixed model? May first guess would be to correlate the predicted values with the observed...

• Replies: 3
• Views: 3,564
09-05-2013, 04:38 AM
33. ### Converting individual scores into group scores in SPSS

Hello all, I am using SPSS for my Master thesis and I've got a question. Hope someone is able to help me, because I'm stuck. My variables are:...

• Replies: 3
• Views: 4,535
09-24-2013, 02:25 PM
34. ### How to report Correspondence Analysis

Hi. I'm busy with a scientific research honours thesis, and for my results the statistician at my university conducted a correspondence analysis...

• Replies: 3
• Views: 1,756
10-10-2013, 04:48 AM
35. ### 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: 3,872
11-18-2013, 05:19 AM
36. ### General method for data analysis

Dear community, maybe you can help me. I have a lots of data like this format: Person/points/work/power/sex Person1/75/10/120/m...

• Replies: 3
• Views: 1,337
11-14-2013, 10:32 AM
37. ### Chi Square for Likert Scale in Single Sample

Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5...

• Replies: 3
• Views: 9,571
01-23-2014, 10:18 AM
38. ### 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: 1,404
12-06-2013, 02:46 AM
39. ### 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: 1,824
11-26-2013, 01:12 PM
40. ### R packeg of gamm4 mgcv

• Replies: 3
• Views: 1,881
12-13-2013, 07:25 AM
41. ### Smearing Transformation

I've found several papers on the smearing transformation for ln(x). However, I"m curious if there is one for ln\frac{x}{1-x}. I can't find...

• Replies: 3
• Views: 1,436
01-20-2014, 02:04 AM
42. ### URGENT: Two-Way Anova or Regression

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

• Replies: 3
• Views: 1,110
01-24-2014, 01:47 PM
43. ### Multiple Paired t-tests

Hi, I'm having a little bit of trouble with some research I'm doing and wondered if anyone could help. I'm looking at political decision-making....

• Replies: 3
• Views: 1,785
01-28-2014, 03:50 PM
44. ### Mann Whitney help

Hi, I did a small experiment and I had 4 distribuitons. these are not normal distribuitions, that is why my professor told me to run a Man...

• Replies: 3
• Views: 1,611
02-07-2014, 05:14 PM
45. ### need help for senior thesis/ NCHA data

I am doing a senior thesis. I will be using secondary data from the NCHA. I want to see if there are gender differences in abusive relationships....

• Replies: 3
• Views: 1,492
02-24-2014, 08:23 PM
46. ### Meta-analysis - can I combine/use these studies?

Hi! I'm trying to set up a meta-analysis with my thesis partner and we ran into trouble which our supervisor isn't able to solve. So I figured...

• Replies: 3
• Views: 2,823
03-04-2014, 05:04 PM
47. ### can non parametric tests be modified for one tailed tests?

Hello all, super newbie here. just a quick question: I have been doing one tailed independent two sample t tests but now on other data I no...

• Replies: 3
• Views: 1,350
03-05-2014, 04:29 AM
48. ### How to test using Spearman correlation in R?

Given such data X-Y 2-6 4-9 6- 3 8- 12 10- 15 When using pearson correlation it will be straight forward, however, when using spearman,...

• Replies: 3
• Views: 1,614
03-07-2014, 10:16 AM
49. ### Picking the correct test, need help urgently!

Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

• Replies: 3
• Views: 1,142
04-09-2014, 12:35 PM
50. ### Which one should I trust : shapiro test or qq plot?

Good evening everyone, Sorry if this question already exist, I searched but didn't find an asnwer. I am using 7-points likert scale for my...

• Replies: 3
• Views: 1,844
04-09-2014, 05:02 PM
51. ### Analyzing 311 Calls trend

For an assignment, I am analyzing 311 call trends. I have downloaded the total number of 311 calls made in my city per month for the last five years...

• Replies: 3
• Views: 1,439
04-28-2014, 03:55 PM
52. ### Balancing data

A couple of classification (lets stick to only two groups for simplicity) models are performing better if we balance the data when there are few...

• Replies: 3
• Views: 1,086
05-02-2014, 01:18 PM
53. ### Percentage and probability

I have this problem I am trying to solve and I am not sure how. Lets say 70% of the demography is white people. Now if I randomly pick 100 people...

• Replies: 3
• Views: 2,069
05-29-2014, 09:03 PM
54. ### Invasive mussels: use ANOVA or another type of analysis

Hope this is right place for this: I am a PhD student studying performance and population dynamics of invasive freshwater mussels (zebra and quagga...

• Replies: 3
• Views: 1,386
05-30-2014, 10:30 AM
55. ### Performance of CSIs at Crime Scenes

Hi, Im after some advice, which i would really appreciate assistance with. At our police force the CSIs are being performance tested by use of...

• Replies: 3
• Views: 2,201
06-19-2014, 06:27 AM
56. ### Interaction or moderation effect - suitable method for analysis?

I have run a two-way between groups ANOVA to analyse my data. However, I have one more variable, which is not one of the factors in the ANOVA. I want...

• Replies: 3
• Views: 1,965
06-17-2014, 08:16 AM

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