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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: 18,796
10-11-2014, 12:02 PM
1. ### 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

Hi to all. I desperately need a method to compare positive and negative likelihood ratios of a diagnostic test within two strata (e.g. likelihood...

• Replies: 0
• Views: 2,832
07-13-2009, 07:20 PM
3. ### Comparing Likert items. What test should I use?

Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

• Replies: 3
• Views: 1,748
RDW
01-24-2015, 07:59 AM
4. ### Comparing Mean and Median

Hello people. I'm currently doing a research on household income and expenditure in my country, and I'm faced with some problems: 1. Are mean and...

• Replies: 2
• Views: 2,229
08-24-2013, 05:52 PM
5. ### comparing means

Hi All, I would like to ask a question about compare mean to answer the research question. i have 2 scales to measure anxiety situation, first...

• Replies: 0
• Views: 1,842
01-18-2014, 09:50 AM
6. ### Comparing means from SAME sample

I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

• Replies: 0
• Views: 3,685
09-01-2010, 01:35 PM
7. ### comparing means\unequal(small) size group

Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

• Replies: 4
• Views: 26,416
08-18-2009, 12:00 AM
8. ### Comparing model fits across groups

Hi all, I have an experiment involving two groups of individuals who receive different treatments, and there are two non-linear models I wish to...

• Replies: 0
• Views: 1,221
05-30-2013, 03:19 PM
9. ### comparing models

This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

• Replies: 7
• Views: 2,357
12-04-2015, 10:26 PM
10. ### comparing multiple means between multiple groups

Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple...

• Replies: 0
• Views: 764
08-30-2016, 12:28 PM
11. ### Comparing non hyper-rectangular design space to uniform distribution

Second post here, another out there question... Does anyone know how to compare a design space point distribution to a uniform distribution, if...

• Replies: 0
• Views: 1,217
07-08-2013, 08:36 AM
12. ### Comparing overdispersion distributions

I am dealing with handling overdispersed count data(Poisson distributions fails to fit). I need to compare three different mixtures of Poisson...

• Replies: 0
• Views: 1,446
09-14-2012, 08:28 AM
13. ### comparing percentage when without knowing n? what test?

I'm trying to do a meta analysis of some poll results and though I know the sample size in general, if I'm comparing the reported results and they...

• Replies: 2
• Views: 1,715
07-25-2011, 06:15 PM
14. ### Comparing pretest and posttest measures of intervention group with control

Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

• Replies: 3
• Views: 4,412
02-27-2012, 12:05 PM
15. ### Comparing Proportions with difference numbers of events

So, I'm interested in examining prey preference of a predator and one of the metrics I am interested in rejection rates for attack. I have 1 hour...

• Replies: 0
• Views: 1,854
09-21-2016, 04:54 PM
16. ### Comparing responses on 5-point scale

Hi All, I have administered a 5-point scale on my participants which they answered on 10 value items- can I assume this is interval data? I have...

• Replies: 3
• Views: 2,438
04-05-2012, 03:26 AM
17. ### Comparing ROC curves

Do you have to have the raw data a ROC curve is generated from to tell if they are signficantly different, or can you use the results such as the C...

• Replies: 0
• Views: 1,690
06-26-2013, 01:51 PM
18. ### comparing section in a scale using spss

Hi everyone; hope you are doing well, I am actually conducting a research, and I am comparing between a pre and post scale. my problem is that...

• Replies: 4
• Views: 1,491
04-02-2017, 09:55 PM
19. ### comparing simulated and experimental data

Hi All, I generated a time series data by simulation (each condition has been generated time condition1 condition2 condition3 .... ...

• Replies: 0
• Views: 1,286
08-04-2014, 03:08 PM
20. ### Comparing standard deviations

Hi, I have data about incomes from two groups and I want to see which group's variance is bigger. The two groups income is measured in the...

• Replies: 1
• Views: 2,171
11-13-2013, 11:27 AM
21. ### Comparing subsets of data from the same population?

I'm hoping someone can help me conceptualize my question better because I have a feeling I'm looking at it the wrong way. I'm looking at a number of...

• Replies: 0
• Views: 1,326
03-19-2015, 04:16 PM
22. ### comparing test results obtained on the basis of different sample sizes

I have variables a1 and a2 with 57 observations each, and variables b1 and b2 with 29 observations each. I compare a1 with a2 by means of a...

• Replies: 0
• Views: 325
06-26-2017, 05:11 AM
23. ### Comparing the mean of top and bottom quartiles

Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

• Replies: 2
• Views: 3,942
02-08-2012, 12:45 AM
24. ### 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: 1,838
11-30-2013, 10:59 AM
25. ### Comparing the output of JAGS to conjugate analysis - normal with unknown mean and var

Dear Bayesians. I'm starting my way in the Bayesian world, and I'm trying to build a simple model for estimating the mean and variance of a normal...

• Replies: 0
• Views: 1,065
09-20-2016, 09:02 AM
26. ### Comparing three groups that have been analysed by Friedman's ANOVA

Dear all, I have been struggling with the following problem and would be extremely grateful for some help. :confused: I have three groups of...

• Replies: 0
• Views: 2,912
02-29-2012, 04:04 AM
27. ### Comparing time curves for two groups in research.

Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

• Replies: 3
• Views: 1,743
07-25-2014, 11:45 AM
28. ### comparing two charts

Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

• Replies: 3
• Views: 2,864
05-06-2009, 05:20 PM
29. ### Comparing two datasets in terms of anonymisation

Hi guys, hope you are doing good! I have quite the conundrum; I'm trying to figure out different ways I can cross-examine two datasets (D1 and...

• Replies: 0
• Views: 1,429
09-13-2016, 03:07 AM
30. ### Comparing two distributions using random drawing.

Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

• Replies: 7
• Views: 3,947
09-18-2011, 08:11 AM
31. ### 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: 2,516
09-25-2011, 05:08 PM
32. ### comparing two measurements over time

I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

• Replies: 8
• Views: 7,837
08-27-2007, 04:38 AM
33. ### Comparing two overlapping samples in a tracking study

I have a quick query about measures of sample accuracy in a tracking study with an overlapping (common) sample, and couldn't see anything here...

• Replies: 0
• Views: 1,378
05-14-2012, 01:19 AM
34. ### Comparing two variable datasets

Hello, I would like to see if two 2-dimentional datasets are the same, my data consists of two groups of xy data - the data is not linearly...

• Replies: 0
• Views: 2,401
bjj
01-13-2017, 02:25 PM
35. ### Comparing within groups and across conditions

Hi, I am not sure if anyone can help me, i have undertaken a large physiological study for my post grad, it is looking at stress hormones within...

• Replies: 0
• Views: 3,272
03-14-2011, 05:35 PM
36. ### Comparison between two joint probability distributions

I have two bivariate tables with variables "Birth Order" (with birth order 2, 3, 4 and 5) on one side and "Birth Interval" (with intervals 10-15,...

• Replies: 0
• Views: 2,253
03-12-2013, 05:24 AM
37. ### comparison for 2 independent groups , t test or ANOVA

What test should i use for a comparison between two independent groups of N=30. Also if a questionnaire is made with only 2 answers like yes or no...

• Replies: 7
• Views: 2,531
06-15-2013, 07:47 AM
38. ### Comparison of 20 serum chemistry analytes of reptile blood at time 0 and time 1 hour

Dear All, I am having troubles in analyzing results of one study: I want to evaluate the effect of time (1 hour) on 20 analytes (e.g. pH, BUN,...

• Replies: 3
• Views: 1,703
08-30-2012, 06:09 PM
39. ### comparison of Exponential distribution and Lognormal Distribution parameters

Hi everyone! I have 30 days worth of data. Each day, I have a set of interarrival times. I wanted to find out the distribution of the arrivals, so...

• Replies: 0
• Views: 3,693
05-29-2012, 07:07 AM
40. ### 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: 1,621
11-22-2013, 05:41 AM
41. ### Comparison of the power of the tests: Parametric test versus Non-parametric test

How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric...

• Replies: 6
• Views: 4,779
08-26-2012, 04:23 PM
42. ### Comparison of time series

Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

• Replies: 2
• Views: 9,374
09-17-2010, 11:58 AM
43. ### Comparison of time series nested in Repeated Measures Design

Post deleted cause it garnered no responses on this forum....

• Replies: 0
• Views: 1,683
04-30-2015, 11:30 AM
44. ### Comparison of two treatments (paired and unpaired)

Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

• Replies: 0
• Views: 1,097
07-19-2014, 03:02 AM
45. ### Comparison quantity with mean values and measurement uncertainty

Hi !! I need help in a problem. I measured a quantity Q from the area A of a peak (normally distributed) divide by two factors. The uncertainty...

• Replies: 0
• Views: 1,513
08-30-2014, 10:47 AM
46. ### Complementary log log

Hi I have a model with a binomial error distribution. Instead of the logit link I use the complementary log log. What is the interpretation of...

• Replies: 1
• Views: 4,783
02-12-2009, 04:09 PM
47. ### Composite Hypothesis Testing Problem

Hello guys, So I have this problem I am trying to solve and its

• Replies: 0
• Views: 964
05-10-2015, 04:48 PM
48. ### Composite Scores - Approaches to Missing Data

I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

• Replies: 6
• Views: 6,635
12-12-2008, 09:43 AM
49. ### composite variables

Dear users, I have a question regarding the calculation of a composite variable out of 5 individual variables which I want to use in a MANOVA...

• Replies: 1
• Views: 1,220
05-03-2014, 03:55 PM
50. ### Compound poisson gamma model and biomass data

I have some biomass data (total count -discrete- of individuals and total dry weight -continuous-) that I would like to model with environmental...

• Replies: 1
• Views: 1,522
06-07-2016, 01:12 PM
51. ### Compute a new variable or is there a better way to do this?

First post, thanks in advance for advice. I would like to examine three variables, with the expectation that: When a subject scores HIGH on...

• Replies: 2
• Views: 1,622
03-26-2013, 04:07 PM
52. ### Compute an optimization stress from size distribution density and abundance

Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

• Replies: 0
• Views: 1,295
06-23-2014, 04:56 AM
53. ### compute true values monte carlo simulation

Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

• Replies: 16
• Views: 6,771
07-04-2010, 05:19 AM
54. ### Computing ICCs

Hi everyone, Have run into a problem that has me absolutely stumped and would appreciate some assistance. I'm attempting to compute the ICC from...

• Replies: 0
• Views: 876
06-29-2015, 03:36 PM

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