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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: 18,803
10-11-2014, 12:02 PM
1. ### Question on what statistics I should use

Hello all, I have data from a survey of ex-prisoners. I want to look at the effect of victimization (victimized or not: dichotomous) on...

• Replies: 1
• Views: 1,097
08-27-2012, 03:49 AM
2. ### Intraclass correlations

I am doing a study to investigate the interrater reliability of a rating scale. I solicited 100 teachers to complete a rating scale on a child and...

• Replies: 0
• Views: 1,331
03-21-2014, 01:29 PM
3. ### Recognition of multiple spacial patterns

Hello! I am looking for some nifty techniques or methods to help me gather elements of a set which are compatible with a base pattern. The set...

• Replies: 0
• Views: 1,013
01-31-2016, 07:42 AM
4. ### Cell culture experiments - parametric testing when there are only three repeats!

Felt this was a theoretical discussion point. My thesis includes cell culture experiments with 100,000 cells per condition repeated three times....

• Replies: 0
• Views: 1,468
09-22-2015, 01:06 PM
5. ### Sphericity- why does it really matter?

Can someone help me understand how a sphericity violation is a problem in repeated measures ANOVA a little better? I assume a sphericity violation...

• Replies: 9
• Views: 1,894
04-16-2013, 01:40 AM
6. ### Exploratory Factor Analysis with Ordinal Data

Hi folks, I am in the midst of absorbing as much information on exploratory factor analysis as I can. I studied this method once before but not to...

• Replies: 2
• Views: 1,356
06-19-2015, 04:10 PM
7. ### large cell counts - Fisher's Exact vs. chi2

Hi everyone, I read a while back that chi2 was most accurate for observed cell counts of only between 5-70, but now I can't find that reference. I'm...

• Replies: 2
• Views: 982
06-14-2016, 04:27 AM
8. ### modern methods data collection

Please can you help me by showing some of the most advanced methods in data collection for surveys or census.I mean using technology like tablets or...

• Replies: 0
• Views: 1,704
09-11-2014, 02:59 AM
9. ### 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: 3,807
07-24-2008, 10:33 PM
10. ### testing for the change in correlation between 2 variables over a 3rd linear variable

I have a hypothesis that the strength of correlation between two continuous variables will decrease with higher levels of a third variable. To give...

• Replies: 0
• Views: 3,365
01-09-2011, 02:04 PM
11. ### stat treatment for yes no questions

I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

• Replies: 2
• Views: 9,662
03-06-2009, 02:57 PM
12. ### Change over time

Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

• Replies: 2
• Views: 812
08-26-2016, 06:55 PM
13. ### 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: 1,779
08-03-2014, 06:43 PM
14. ### Need a meaningful way to describe heavily-skewed numbers for 50 states

Hi there, I apologize if this is an insultingly stupid question, but I managed to enroll in a political research class that involved very little...

• Replies: 0
• Views: 1,620
05-11-2009, 04:14 PM
15. ### Tolerance intervals for binomial

I'm trying to learn more about tolerance intervals for a binomial distribution, but am struggling to find much literature about them. Does anyone...

• Replies: 0
• Views: 2,942
09-30-2011, 04:10 AM
16. ### Box's Test after outlier Removal

Hello everyone, I have searched the forum and couldn't find an answer, so I figured I would start a new thread. I am running a 1-way MANOVA for...

• Replies: 0
• Views: 1,262
08-02-2016, 01:58 PM
17. ### Stuggling with choosing the correct test.

So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

• Replies: 9
• Views: 1,929
08-27-2016, 01:11 PM
18. ### Bayesian Variable Transformation (solve for PDF)

Hi I'm struggling with where to start for this variable transformation problem. X~Bin(N,p) so that p(X=x) = (N choose x) * (p^x) * (1-p)^(N-x) ...

• Replies: 2
• Views: 2,207
09-14-2011, 06:11 PM
19. ### Which method? Categorical data (IV) and continuous numerical data (DV)

Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am...

• Replies: 0
• Views: 1,638
06-21-2016, 06:17 AM
20. ### 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: 3,941
10-26-2009, 03:23 PM
21. ### 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: 1,635
02-23-2013, 11:52 PM
22. ### Kernel Density Estimation (KDE)

I feel unsure as to what is the minimum number of genuine (real life) data points needed to applied the procedure and estimate the curve. Any...

• Replies: 3
• Views: 2,671
01-03-2012, 07:08 PM
23. ### quantile regression vs. non-parametric curve fit of quantiles

hello, i am doing some data analysis using a technique like the one pictured here:...

• Replies: 0
• Views: 2,897
d^2
06-23-2008, 09:54 AM
24. ### [R] permanova for multivariate repeat measures toxicology data set

Hello, I would like to use a permanova to analyze my repeated measures, multivariate data set using the package vegan (adonis function) in R. I...

• Replies: 0
• Views: 2,949
07-12-2013, 03:55 PM
25. ### Need help in finding historic data on real interest rate and CPI

Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

• Replies: 3
• Views: 4,247
05-21-2011, 10:01 AM
26. ### 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: 3,876
05-21-2011, 10:09 AM
27. ### income convergence why equations are wrong

we want to see if there is income convergence when trade liberalization takes place. we use two measures. . The fi rst is the standard deviation of...

• Replies: 0
• Views: 1,144
11-16-2013, 06:40 PM
28. ### Multiple Comparisons across events with discrete probabilities?

Been stuck on this problem for a few days. I have calculated many distributions that are all non-parametric, but appear to have trended to be...

• Replies: 0
• Views: 1,207
07-22-2015, 10:33 AM
29. ### Coding Data

I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

• Replies: 21
• Views: 5,767
08-26-2011, 09:30 AM
30. ### 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: 1,521
07-17-2012, 10:13 AM
31. ### Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

• Replies: 6
• Views: 1,562
01-28-2015, 02:46 PM
32. ### 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: 1,719
02-18-2015, 04:15 PM
33. ### Anova & post hoc analysis

wrong forum

• Replies: 0
• Views: 1,490
11-15-2013, 09:39 PM
34. ### What type of test should I use?

I am trying to determine whether being involved in an extracurricular activity has an impact on different course grades (dependent variable),...

• Replies: 2
• Views: 1,168
11-14-2015, 04:39 PM
35. ### Hierarchical Linear Modeling

I have a question about independent variables in HLM. Does it matter if they are dichotomous or continuous? Are there any advantages to dichotomizing...

• Replies: 1
• Views: 2,346
12-11-2012, 07:02 PM
36. ### Estimating location of lower tail

Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

• Replies: 2
• Views: 1,649
03-31-2016, 11:58 AM
37. ### ttest for comparison of group means from pooled samples

Hello, I have results from an experiment where a number (n=50) of biological samples were pooled together with a single measurement of chemical...

• Replies: 0
• Views: 777
06-09-2016, 09:38 AM
38. ### Logistic regression question

Hi, I have a large data set (over 1 million cases) and I put in approximately 5 to 10 IV that are all categorical. I am not getting a...

• Replies: 11
• Views: 5,560
10-20-2011, 11:11 AM
39. ### Conjoint analysis

....i need some insight please... those familiar with conjoint, though i don't have any statistical package to run on it, so my plan was to do...

• Replies: 4
• Views: 5,956
03-16-2009, 05:52 AM
40. ### continuous random variable

why the continuous random variable has to be given a Limit /Range? Cant we solve this random variable without a limit ? What is Continuous...

• Replies: 6
• Views: 2,947
06-06-2011, 03:43 PM
41. ### Ranked data

I asked my participants to rank 5 items as 1=least severe to 5 =most severe, now how can I analyse these data, parametric or non-parametric tests,...

• Replies: 2
• Views: 3,372
01-16-2011, 02:10 PM
42. ### Comparing Intervention Groups for Students

I am assigning interventions to student groups based on pre-test data (reading ability). I am using several different reading interventions. Our...

• Replies: 0
• Views: 2,394
01-14-2017, 11:00 AM
43. ### Survey statistics

Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

• Replies: 4
• Views: 2,853
01-01-2011, 02:20 PM
44. ### Identifying relevant predictors and interactions

I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

• Replies: 0
• Views: 877
11-23-2015, 05:57 AM
45. ### Randomized controlled trial sample size calculation

Well I just realized this is definitely in the wrong forum can someone please delete this thread? I can't seem to find an option for that myself.. ...

• Replies: 1
• Views: 2,208
07-17-2014, 01:17 PM
46. ### Transition matrix of a Markov chain with a given limiting distrubuti

I want to create a transition matrix P (e.g. 4x4) for a stationary Markov chain with a given limiting distribution p, but I want P to bear as much...

• Replies: 1
• Views: 4,273
04-08-2010, 08:44 PM
47. ### how to find the UMVUE of the location parameter under t distribution

f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}} , v>=3 i have no...

• Replies: 7
• Views: 6,007
04-04-2010, 09:05 AM
48. ### How to prove the UMVUE under these conditions

Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

• Replies: 3
• Views: 3,272
04-06-2010, 12:00 PM
49. ### Converge question (CLT ?)

hi, the question is: Let X_1, X_2, ... be i.i.d. standard normal random variables. Prove that (X_1+X_2+...+X_n)\over\sqrt{n}does not converge in...

• Replies: 0
• Views: 1,671
04-15-2010, 05:21 AM
50. ### Correlation/Regression using Aggregrated Data

Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

• Replies: 0
• Views: 3,219
10-30-2008, 07:44 AM
51. ### 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: 3,790
03-11-2009, 05:40 PM
52. ### Confidence intervals in population-based study?

Hello everyone, I have a question that might be quite simple. I'm planning a population-based study with very basic statistical analyses (mostly...

• Replies: 1
• Views: 1,658
11-09-2015, 11:56 AM
53. ### How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

• Replies: 0
• Views: 6,555
08-21-2011, 05:46 PM
54. ### Need help to combine two indeces

Hi, I am currently writing my thesis on professionalized political Twitter profiles, and I have created two indeces to measure...

• Replies: 0
• Views: 1,355
07-07-2015, 05:11 AM
55. ### Anova without intercept?

Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says “no intercept”. Once I do...

• Replies: 3
• Views: 3,573
10-31-2016, 03:02 PM

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