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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: 18,649
10-11-2014, 12:02 PM
1. Making statistical inference considerations

May I ask what are the considerations in making statistical inference? I have the following ideas in my mind, but I am not sure what are really...

• Replies: 0
• Views: 2,246
08-26-2012, 05:02 AM
2. Bayesian Statistics

Hello I need an example, as simple as possible to Bayesian analysis. I was thinking about a simple proportion problem, perhaps with a credibility...

• Replies: 3
• Views: 2,066
08-25-2012, 07:14 PM
3. Autocorrelation of panel data: need literature!

I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

• Replies: 2
• Views: 1,837
08-24-2012, 11:38 AM
4. Is a z-transformation appropriate in this case?

Hi everyone :-) n=150 Everyone gets a test with 14 items and a variable "score" is calculated from the responses. Trouble is, 50 of my tests...

• Replies: 5
• Views: 1,771
08-24-2012, 08:45 AM
5. MANOVA vs multiple ANOVAs

Hello, I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to...

• Replies: 3
• Views: 2,377
08-24-2012, 01:41 AM
6. Pearson's chi-test for more than 2x2

So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2...

• Replies: 2
• Views: 2,959
08-23-2012, 04:30 AM
7. repeated measures MANOVA - 3 measurements in time - interpretation

Hello, I am running a repeated measures MANOVA (in SPSS) to determine whether there are statistically significant differences in a group over time...

• Replies: 0
• Views: 1,099
Laf
08-22-2012, 05:35 AM
8. sum of truncated Normal Variables

Hello all, I am trying to find if there exists a closed solution for the following: X~N(u,var) {normal dist) Y~N((u,var)|Y>a) {truncated normal...

• Replies: 0
• Views: 3,178
08-21-2012, 03:23 AM
9. Need a binary data with high intraclass correlation.

Hi! for my research, in order to compare some new correlated binomial models, I need an empirical data where the binomial binary trials are highly...

• Replies: 0
• Views: 1,263
08-20-2012, 01:49 PM
10. Criterion Validity

Hi all, I am comparing scores from two tests (new test vs gold standard). The new test is scored as 1=initial; -2=elementary low;...

• Replies: 1
• Views: 2,313
08-19-2012, 05:44 PM
11. Random or fixed slope in hlm?

Hello, I am doing multilevel analysis and I am not sure whether I should include a random slope or not. The Wald test produces the following...

• Replies: 12
• Views: 12,094
08-19-2012, 03:27 PM
12. Statistical Theories, Methods, and Fields applying to Educational Assessment

I'm interested in doing research in education and statistic. Particulary with student assessment and students. However, I know this is very broad and...

• Replies: 4
• Views: 1,913
08-17-2012, 04:04 PM
13. Which tests? Clarification plz!

Hi all! I’m currently doing some research and I’m a bit of a novice so wanted to check if I was on the right lines with the statistical tests I’m...

• Replies: 2
• Views: 1,902
08-17-2012, 01:18 PM
14. Help with test interpretation

Hi all I'm doing some research and have run a few kolmogorov- smirnov tests on my data. My question is whether the magnitude of the values have...

• Replies: 2
• Views: 1,674
08-17-2012, 01:00 PM
15. Mutlivariate Analysis/Using Controls

Disclaimer: I'm a student in the social sciences with *very* elementary training in quantitative methods. If I am testing the relationship...

• Replies: 7
• Views: 1,942
08-17-2012, 10:22 AM
16. Advice on specifying factors in a Permanova model - repeated measures design

Hello all, I am new to the forum and this is my first post. I would appreacite if somebody could provide advice on the following problem: I am...

• Replies: 0
• Views: 1,609
08-16-2012, 07:09 PM
17. Estimating parameters using a different method?

Hi, I have a probability distribution which has two parameters \alpha and \beta I re-parametrized the distribution such that the new...

• Replies: 2
• Views: 1,114
08-16-2012, 08:43 AM
18. Why use Chi-square?

Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

• Replies: 9
• Views: 4,668
08-15-2012, 01:58 PM
19. 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: 2,339
08-15-2012, 01:06 PM
20. What is the best way to treat Autocorrelation and Heteroscedasticity problems in TS

Hi, I am doing time-series regression. I face the problems of Heteroscedasticity and Autocorrelation as following. ...

• Replies: 0
• Views: 1,783
08-14-2012, 05:15 AM
21. Selecting the RIGHT method this analysis --->

Any help with the following would be greatly appreciated. I have a model of the form: Y = \mu +C +X+S+e where Y is continuous and C,X and S...

• Replies: 14
• Views: 3,239
08-13-2012, 05:17 PM
22. Why use Kruskal-Wallis?

Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

• Replies: 9
• Views: 7,214
08-13-2012, 03:14 PM
23. Mentioning that data was not randomly sampled in discussion?

Hi there, I was just wondering whether the following is a good idea to mention in my discussion: Im investigating depression and maladaptive...

• Replies: 8
• Views: 1,935
08-13-2012, 12:58 PM
24. Algebra, two-sample t-statistic, variance

• Replies: 20
• Views: 5,728
08-13-2012, 12:31 AM
25. Statistical approach to 0 bounded skewed data?

I'm working on a data set (neuronal spike density) that contained a lot 0 values and I am having a hard time trying to come up with a valid...

• Replies: 1
• Views: 2,335
08-12-2012, 11:22 PM
26. Several nested categorical ecological variables, appropriate test?

Hi all, this is my first post. I've looked through the FAQ and links to selecting a test, but haven't found an example of a test similar to my own. ...

• Replies: 0
• Views: 1,529
08-12-2012, 09:54 AM
27. Testing affects of non-normal explanatory variables on response variable

Hi all, I'm having real problems with analysing some data (I am using R), and wondered if anyone would please be able to offer me any advice. I...

• Replies: 0
• Views: 1,613
08-11-2012, 05:14 PM
28. Help with interpreting simple chi-square!

Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

• Replies: 2
• Views: 2,499
08-11-2012, 12:48 PM
29. Autocorrelated measurements with autocorrelated errors, covariance term

Dear all interested stats people, I encountered the following situation for error propagation of a time series. 1.) Given a time series...

• Replies: 0
• Views: 1,490
08-11-2012, 07:43 AM
30. Sampling sizes and significance

Hi all, I got a question hoping someone can help me out. I use this site to calculate my sample sizes http://www.raosoft.com/samplesize.html ...

• Replies: 3
• Views: 1,976
08-10-2012, 08:59 AM
31. Reliability

How do I calculate reliability for something that I do not have an "exact" answer for? For example, in an observational setting with 2 observers...

• Replies: 1
• Views: 1,535
08-10-2012, 08:53 AM
32. Multivariate analysis with dependent variables and replicates

Dear All, I have been stuck in this issue for 2nd day now. I have a dataset of 13 depended variables (consequitive (not repeated!) measurment...

• Replies: 0
• Views: 1,398
08-10-2012, 05:49 AM
33. Post Hoc

If you have two groups for the I.V. (i.e. Men and Women) and one D.V. is it possible to run just a Post Hoc test? Isn't that the same as a T-test? ...

• Replies: 2
• Views: 1,342
08-09-2012, 10:17 PM
34. Using a proportion as an effect size in meta-analysis

Hey TS, I have a question about using a proportion as an effect size in a meta-analysis. Let's say, for example, that I am interested in a...

• Replies: 1
• Views: 2,901
08-08-2012, 08:51 PM
35. Paired t-test using averages

Hi, I would really appreciate if you could help me with my research design for my thesis. I am investigating a group of companies in terms of %...

• Replies: 0
• Views: 1,489
08-07-2012, 05:31 PM
36. 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: 3,726
08-07-2012, 04:20 PM
37. Insignificant Results

Just ran a simple regression, but got insignificant results. I know this is vague, but anyone have any idea why? Bad theory? Or something wrong in my...

• Replies: 1
• Views: 2,128
08-05-2012, 10:33 PM
38. What model for small sample?

Hi! I have 59 observations of farmers' annual net income (which is representative) and I want to see the effect of 15 independent variables, such...

• Replies: 2
• Views: 1,913
08-05-2012, 08:40 AM
39. Stats Analysis Question =]

Hey Everyone, Question!: In an aged-matched experiment, I want to compare . . . . I want to test the significance of DrugY on performance of...

• Replies: 0
• Views: 1,295
08-03-2012, 07:38 PM
40. SEM - Using Subscales as Observed Variables vs. Items

I have some data that I am want to make an SEM model out of. It isn't a very sophisticated model, basically four variables (the BIS and 3 BAS...

• Replies: 0
• Views: 2,261
08-03-2012, 11:11 AM
41. Linear mixed model analysis with unbalanced measurement time points

I am interested in performing a linear mixed model analysis in SPSS 20.0. Specifically, I will be analyzing repeated measures data with several...

• Replies: 0
• Views: 1,187
08-03-2012, 12:41 AM
42. BH, why this threshold ?

Hello, I have a theoretic question. When using the BH procedure for controlling the false discovery rate, we compare the p values in this way: ...

• Replies: 1
• Views: 1,433
08-02-2012, 06:01 PM
43. Simple question

Hello everyone.. This is my first post here, and I really think it's a great idea to have such forum.. Anyway, I have a simple question I...

• Replies: 5
• Views: 2,037
08-02-2012, 05:22 PM
44. Distribution of p values

Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

• Replies: 4
• Views: 5,560
08-01-2012, 09:11 AM
45. Principal Component Analysis

hi guys, sorry to bother you. would like to seek help on principal component analysis regarding the interpretation of data or on how its going...

• Replies: 1
• Views: 4,191
08-01-2012, 03:32 AM
46. Sample Size Calculater based on a Known Population Size

Hello all, Part of the research objectives is to achieve generalisation of the findings and extend it to the rest of organisation. To do so, I...

• Replies: 0
• Views: 2,844
07-31-2012, 03:43 PM
47. KL Divergence - What does the double bar notation mean?

Hi, Kullback-Leibler divergence tends to be written as D_KL(P||Q), where P is a true probability distribution of random variable x and Q is a...

• Replies: 0
• Views: 1,539
07-31-2012, 09:41 AM
48. Citation needed for removing 3 Stdev outliers

Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

• Replies: 3
• Views: 2,689
07-30-2012, 04:51 PM
49. [SPSS] Different sig. level with Two-way ANOVA vs. Independent T-test, Help!

Hi, I am confused right now. I am a newbie for SPSS. The sig. level in independent t-test is different from in two-way ANOVA. Why is that? My...

• Replies: 0
• Views: 1,362
07-29-2012, 05:56 PM
50. Technical name - Is this a 'multi-level model'?

Hello. I am hoping that someone can tell me the technical name for the following type of analysis. I have a sense that it may be a 'multi-level'...

• Replies: 2
• Views: 2,496
07-28-2012, 01:15 AM
51. Can I use a chi-square test for this 2x3 contingency table?

Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

• Replies: 1
• Views: 18,935
07-26-2012, 09:30 PM
52. Employee survey: how to make it more representative?

Gentlemen, I am creating a survey to monitor employee satisfaction with their employers. I am designing a survey which contains questions...

• Replies: 1
• Views: 2,001
07-26-2012, 10:12 AM
53. breaking data into training and testing (hold-out) sets

Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

• Replies: 3
• Views: 2,716
07-21-2012, 04:47 PM
54. Looking for guidance on an experimental design

Hey folks: I've got a question that requires a somewhat complex experimental design (nested + repeated measures) and wanted to get a few...

• Replies: 5
• Views: 1,847
07-20-2012, 06:31 AM
55. Statistical Analysis Plan - help!

I'm doing a summer research project on trends of anxiety and depression. Unfortunately, my preceptor has disappeared in the meantime and I'm left to...

• Replies: 0
• Views: 1,507
07-17-2012, 10:13 AM

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