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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: 18,616
10-11-2014, 12:02 PM
1. ### Need for Bonferroni correction

Hi All, I'm hoping you can help me figuring out whether doing ANOVA or MANOVA save on power. My understanding is that ANOVA will tell you if...

• Replies: 4
• Views: 4,468
09-21-2011, 04:19 PM
2. ### Comparing two groups on multiple DVs

Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

• Replies: 4
• Views: 2,485
09-25-2011, 05:08 PM
3. ### Margin of error and the median

Hi there, Was just wondering if someone could help me determine whether The general sampling error of a survey (margin of error) can be applied...

• Replies: 4
• Views: 7,432
10-10-2011, 05:24 PM
4. ### mediate?? what does this word mean in terms of statistics?

I know mediate in normal terms refers to intervening to to being agreement or reconciliation but in terms of statistics is it different? For example...

• Replies: 4
• Views: 12,573
10-13-2011, 05:05 PM
5. ### Correlating behaviors in time

This is definitely off topic but still linked. I saw some of what you do TheEcologist. I asked a question on here about correlating behaviors in...

• Replies: 4
• Views: 2,859
11-04-2011, 12:27 PM
6. ### Anova test?

I have data for 09,10, and 2011. I have an exertion level for each individual. My indivduals are classified by the shift they work (8 day, 8 night,...

• Replies: 4
• Views: 2,186
11-07-2011, 09:34 AM
7. ### Chi Square - confused which variables to use.

Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

• Replies: 4
• Views: 3,106
11-14-2011, 08:38 AM
8. ### Testing Research Hypothesis

Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

• Replies: 4
• Views: 2,777
11-15-2011, 08:59 AM
9. ### Cohort

Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

• Replies: 4
• Views: 3,027
11-18-2011, 01:04 PM
10. ### Which test to use for this?

Hi folks, I'm conducting a little test with a friend who plays roulette online. He maintains that the 'spins' generated by online casinos are...

• Replies: 4
• Views: 2,049
12-31-2011, 02:47 PM
11. ### Sample Size Help

I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

• Replies: 4
• Views: 1,820
01-24-2012, 12:24 PM
12. ### Indirect Effect Report

Hi All, I’m going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

• Replies: 4
• Views: 3,963
02-16-2012, 02:15 PM
13. ### Subseting a large dataset for analysis

Hello all! Here's my situation: I have a data set that contains about 2.5 million observations, consisting of 13 variables in each row. Each row...

• Replies: 4
• Views: 2,251
02-15-2012, 08:54 PM
14. ### Multiple Imputation of Pre-Composite Scores

I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

• Replies: 4
• Views: 3,195
03-02-2012, 06:33 PM
15. ### I'm working for the plaintiff

Plaintiff is Mike. Pat collected Mike's oil royalties for 16 years and won't disgorge them - he's ditched his bank records and won't make an...

• Replies: 4
• Views: 1,743
03-26-2012, 09:57 PM
16. ### Chi sqared test or fisher exact test?

Hi, I am doind research on different treatments to a disease. I broke down the categories into different age groups, i.e. 5-10,11-15,16-20 etc. and...

• Replies: 4
• Views: 2,211
04-10-2012, 07:13 PM
17. ### Stratified Random Sampling

If the population size for each stratum is unknown and cannot be measured ? Can I still utilize this sampling procedure ? How to estimate the...

• Replies: 4
• Views: 2,566
05-27-2012, 10:18 PM
18. ### Bayesian approach to comparing parameters of two distributions

This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

• Replies: 4
• Views: 2,955
05-09-2012, 02:20 PM
19. ### Bayesian t-test

Hello I tried looking for a simple explanation with an example of how to perform a procedure that will be equivalent to the t-test using Bayesian...

• Replies: 4
• Views: 4,146
05-11-2012, 06:11 AM
20. ### Hypothesis Testing

Hello , I have the following Null Hypotheses : There is no value grater than 20 If I have a population :...

• Replies: 4
• Views: 2,283
06-11-2012, 06:49 PM
21. ### 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: 5,545
08-01-2012, 09:11 AM
22. ### 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: 1,907
08-17-2012, 04:04 PM
23. ### How to find minimal sample size in my case to compare means of 2 groups by t-test?

Hello, please help. I have 2 groups of people (treated with a drug and untreated). I measure percentage of green cells among particular type of...

• Replies: 4
• Views: 1,938
10-25-2012, 06:03 AM
24. ### Giving statistical significance to the max value of a vector

Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

• Replies: 4
• Views: 1,859
10-29-2012, 11:32 AM
25. ### 2x2 Repeated Measures ANOVA

Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

• Replies: 4
• Views: 3,115
10-26-2012, 09:02 AM
26. ### What Exactly Constitues A Valid Meta-Analysis?

Throughout my further studies in statistics, I was always concerned on what exactly makes a meta-analysis a valid meta-analysis. When I began my...

• Replies: 4
• Views: 1,850
10-31-2012, 01:55 PM
27. ### sample size estimation

Dear All, I know that we can find the sample size formula from n=/me^2 but if the survey has 5 questions which two of them yes/no and 3 of them ...

• Replies: 4
• Views: 1,839
11-20-2012, 01:20 PM
28. ### Survey Question with 4 Point Likert Scale and Yes/No Question

Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type...

• Replies: 4
• Views: 14,795
12-10-2012, 01:39 PM
29. ### What's the name of this distribution? (pdf ~ gaussian times x)

Hi My apologies if this a simple question but, despite extensive searching, I seem unable to find an answer and I don't know the correct terms to...

• Replies: 4
• Views: 1,222
12-17-2012, 03:14 AM
30. ### Repeated Measures ANOVA Options?

I was planning on running a repeated measures ANOVA but found these issues with my data. The assumption of sphericity was violated as assessed...

• Replies: 4
• Views: 1,475
04-30-2013, 06:38 PM
31. ### Can fixed effects models deal with nested data?

I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

• Replies: 4
• Views: 4,442
03-10-2013, 03:41 PM
32. ### Chi and linear-by-linear

A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

• Replies: 4
• Views: 4,490
03-14-2013, 01:37 AM
33. ### Correlation and Regression

Hi all, I have a question about the significant p value in both correlation and regression. Is there any difference between the p values in both...

• Replies: 4
• Views: 1,531
04-10-2013, 02:37 AM
34. ### What sample size do you need to not do signficance test

Not really a statistical question I know.... This is covered in detail on another thread, but because of limits on my data I can not calculate a...

• Replies: 4
• Views: 1,250
02-13-2013, 02:43 PM
35. ### Input needed on an current model to answer research question

Hi, I'm currently working on a research project and would appreciate any input or suggestions. In the study, we examined breast cancer...

• Replies: 4
• Views: 1,436
03-05-2013, 05:11 PM
36. ### Multiple comparisons and multiple time points

Hi all, I wanted to ask a questions that I would assume I should know by now... I have done an experiment where I am evaluating the effect of...

• Replies: 4
• Views: 2,095
04-01-2013, 02:10 PM
37. ### Statistical books (social sciences / policy analysis)

Hello everyone! Next year I will be doing a MSc program in policy analysis at University of Leuven in Belgium. It's been a few years since I...

• Replies: 4
• Views: 1,868
03-06-2013, 09:48 AM
38. ### Te assumption of Normality

Hello i have some variables which consists of 41 cases,those cases represent averages of many cases,that is, for each case the average is calculated...

• Replies: 4
• Views: 1,714
03-14-2013, 06:04 AM
39. ### Statistical method(s) for repeated measures....

Hi all, I'm doing a project where I want to see the effect of diet. The tricky part here is that same people have been answering a questionnaire...

• Replies: 4
• Views: 1,812
04-01-2013, 02:26 PM
40. ### Hierarchical (nested) ANOVA non-significant interactions

Hi, I am trying to build and test models in hierarchical Analysis of Variance. I wondered if someone could offer some advice as to what to do if...

• Replies: 4
• Views: 1,641
03-04-2013, 08:03 AM
41. ### Durbin-Watson statistics - autocorrelation

If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

• Replies: 4
• Views: 3,427
03-21-2013, 04:01 PM
42. ### MLE for correlation (not covariance) matrix?

Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

• Replies: 4
• Views: 3,649
02-08-2013, 11:33 AM
43. ### Hypotheses testing in CFA.

Hi, I am struggling to understand, how support/reject the hypotheses addressed by my research model. I have conducted a second order CFA and...

• Replies: 4
• Views: 1,470
04-24-2013, 03:27 PM
44. ### difficulties with finding a suitable research question(s)

Hello, everyone, :wave: I have an ANOVA-analysis task, and I need to come up with the most suitable research questions for it. the task is as...

• Replies: 4
• Views: 1,218
05-03-2013, 08:26 AM
45. ### How to analyse this ranking survey ?

Hi all, I got a project from a newspaper company to find out the consumer preference of different middle income and high income group people that...

• Replies: 4
• Views: 2,553
05-22-2013, 10:53 AM
46. ### Interpreting the "Rotated component matrix" in Varimax Factor Analysis

So I did Varimax factor analysis for 21 questions in order to group them. As per my understanding the rotated component matrix places each question...

• Replies: 4
• Views: 19,045
06-07-2013, 05:14 PM
47. ### Ecological statistics - comparison across three years

Hello all, I have a rather large data set to analyze, and I would appreciate some guidance. For this dataset, 80 plots were sampled for dead tree...

• Replies: 4
• Views: 1,765
06-08-2013, 04:38 PM
48. ### Am I applying this Chi-squared test correctly?

Hi everyone! I am a history grad student and I am trying to use some statistics in one of my papers. I am working with a certain (ancient) text...

• Replies: 4
• Views: 1,753
06-16-2013, 08:53 PM
49. ### Which test to use?

Thanks in advance for reading my post. I have a year's worth data that describes the frequency of patient falls organized by the attending...

• Replies: 4
• Views: 1,251
06-21-2013, 02:07 AM
50. ### Finding Relationships with Crosstab Data

first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

• Replies: 4
• Views: 2,075
06-25-2013, 04:52 PM
51. ### Extrapolating to a population from a sample

Hello, I am having problems with a seemingly simple question. Here is the situation: Imagine, I grow 3 kinds of trees (A, B, C) for sale in a...

• Replies: 4
• Views: 1,942
07-18-2013, 02:22 PM
52. ### Are my observations independent or not?

Hi everyone! I have an issue with my observations. I don't know if I can state they are independent or not. In my study, I have 8 different tasks...

• Replies: 4
• Views: 3,305
07-18-2013, 02:33 PM
53. ### Why not go with tests dealing with unequal variances/unbalanced sample size first?

Hi All, Here is the context: a lot of texts for hypothesis testing/ANOVA first examine the cases where either the number of samples per group are...

• Replies: 4
• Views: 1,603
08-16-2013, 02:56 AM
54. ### Is ANOVA applicable? If not what Statistical Tool woud you recommend?

I am conducting a study to see whether differences exist among different age groups (10 year interval) to serious injuries. As far as I know, in...

• Replies: 4
• Views: 2,245
08-23-2013, 12:36 AM
55. ### Meta-Analysis or alternative method?

I am carrying out a systematic review on conservative (physiotherapy) treatment in comparison to surgical treatment. I have recorded the return to...

• Replies: 4
• Views: 1,990
08-21-2013, 11:24 AM
56. ### Correlation Between Unpaired Data?

What type of statistics compares or finds correlation of unpaired data? I'm assuming an XY scatter plot wouldn't work. I'm also assuming a t-test or...

• Replies: 4
• Views: 4,663
08-27-2013, 12:15 PM
57. ### Asking causal questions directly vs measuring variables in a survey

Hi all, is it okay to ask causal questions like "Does A cause B?" directly as survey questions instead of asking question that measure A and B...

• Replies: 4
• Views: 2,170
09-19-2013, 10:59 AM
58. ### Can a convenience sample ever be considered truly cross-sectional?

I'm having a debate over terminology with a colleague. We've done a small census survey (n<50) of residents and staff at a local out-patient clinic....

• Replies: 4
• Views: 7,435
09-18-2013, 07:50 AM
59. ### Negative confidence intervals

HI THERE!! I am presenting 95% CIs in my thesis for the means of the data sets like metric tons of tuna exported per month, value of tuna exported...

• Replies: 4
• Views: 4,388
09-24-2013, 08:47 AM

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