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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: 18,662
10-11-2014, 12:02 PM
1. concordance of two sets of data

here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

• Replies: 0
• Views: 3,353
10-13-2008, 12:29 PM
2. Conditional Accuracy Functions

Based on a previous study about reaction time as a proxy for attentional constraint, we are analyzing our data using conditional accuracy functions....

• Replies: 0
• Views: 1,211
10-18-2013, 12:46 PM
3. Conditional distribution for covariance matrix with constraint

Hi, I'm trying to work out how to draw from the conditional distribution for a covariance matrix given some correlated multivariate Gaussian data....

• Replies: 2
• Views: 1,630
08-12-2014, 11:16 AM
4. Confidence interval and P-value

Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

• Replies: 3
• Views: 2,295
02-08-2012, 11:48 AM
5. Confidence interval for (Xbar-2*Ybar)

Hi, Can any body help me to calculate confidence intervals for (Xbar-2*Ybar), where X and Y are two random variables. Is this as simple as (Xbar -...

• Replies: 2
• Views: 2,299
06-13-2012, 11:06 AM
6. confidence interval for combined data

Hi everyone, I'm new here, so forgive me if I don't get something quite right. I have a question for how best to do a confidence analysis of a set...

• Replies: 5
• Views: 8,126
06-24-2009, 02:32 PM
7. Confidence interval for N, based on binomial

Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

• Replies: 0
• Views: 1,285
07-14-2014, 03:59 AM
8. confidence interval for the median(Wilcoxon)

Hello.I have a project with subject the confidence interval for the median(Wilcoxon) and i can't find any information.I would appreciate it if...

• Replies: 0
• Views: 1,217
06-16-2014, 02:35 PM
9. confidence interval GREGG estimator

i have estimated different proportions based on a sample survey. The estimation is done with the GREGG estimator(because of problem with nonrespone)....

• Replies: 0
• Views: 1,628
11-05-2010, 09:01 AM
10. Confidence Interval Question

Let Y_n be the nth order statistic of a random sample of size n from a distribution that has pdf f(x) = (3x^2)/(t^3) with 0<x<t. a) Show that P(c...

• Replies: 0
• Views: 1,733
11-14-2011, 05:49 PM
11. Confidence intervals and effect size for non-parametric tests help

Hi I am currently carrying out data analysis on SPSS for pre post treatment measures using non-parametric tests, the Wilcoxon signed rank test...

• Replies: 1
• Views: 1,443
03-05-2016, 10:13 PM
12. Confidence Intervals in a research paper

Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

• Replies: 3
• Views: 3,284
03-24-2016, 07:42 AM
13. 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: 1,613
11-09-2015, 11:56 AM
14. Confidence intervals vs. Standard error bars

I came across this article discussing the topic of confidence intervals and error bars ib plots and thought I'd share: ...

• Replies: 2
• Views: 2,054
11-30-2013, 11:46 PM
15. Poll: Confidence Intervals: Closed or Open Intervals

I want to pose a question, mainly theoretical in nature, but applied responses are more than welcome. First, I'll define some terms. An interval...

• Replies: 4
• Views: 190
10-10-2017, 06:26 PM
16. confirmatory factor analysis

I did confirmatory factor analysis and wanted to know which item is a high-loading item. One item is significant, but it's path coefficient is...

• Replies: 0
• Views: 1,477
09-23-2013, 05:42 PM
17. Confronting two tests

Hi A group of people have taken a test with 3 possible answers. Then they underwent therapy. Finally, the took the same test again (with the 3...

• Replies: 2
• Views: 1,395
12-15-2011, 12:19 PM
18. Confused regarding Principal Component Analysis

Hi all, I have a scenario in which I was advised to use Principle Component Analysis but my knowledge of stats is fairly rudimentary so I am...

• Replies: 11
• Views: 3,271
09-13-2010, 08:34 PM
19. Confused: correlated groups Chi Square?

Hi all, I have three groups: Group C is a subset of Group B which is in turn a subset of Group A. Members of Groups B and C were not randomly...

• Replies: 0
• Views: 2,538
09-27-2010, 06:12 PM
20. Confused: Metropolis-Hastings, its variations and the Hastings correction ratio

Hello everyone, Over the past few weeks I have been studying MCMC and Metropolis-Hastings algorithms. Unfortunately I am stuck and confused with...

• Replies: 2
• Views: 3,282
02-08-2016, 11:05 PM
21. Confusion in calculating average-strange case

:mad:Plz find the attachment & help me in solving value of average in these strange cases. Link of my word problem is:...

• Replies: 0
• Views: 1,246
11-10-2011, 06:04 AM
22. Confusions regarding Regression, Multicollinearity and Factor Analysis

I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

• Replies: 2
• Views: 3,123
01-29-2013, 03:18 PM
23. 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: 5,884
03-16-2009, 05:52 AM
24. Conjoint analysis - orthogonal design

Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

• Replies: 0
• Views: 5,841
12-03-2010, 09:46 AM
25. Considerations for choosing the right model

Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

• Replies: 1
• Views: 2,671
02-13-2012, 09:42 AM
26. Considering Skewness and Kurtosis

Hello All, With test data the parameters were created for mean, standard deviation and the two other moments. I then take look at samples one at...

• Replies: 0
• Views: 1,631
06-05-2016, 12:40 AM
27. Consistency in statistical tests

Hiya, this is quite a basic question. I'm testing whether administration of a drug causes an increase in 7 different dependent variables. So my...

• Replies: 1
• Views: 4,034
06-22-2012, 02:47 PM
28. Constant such that correlation is zero

Suppose that we four random variables, A, B, C, D that have the same standard deviation. Here, A, B, C, and D are chosen randomly and independently...

• Replies: 0
• Views: 1,857
01-13-2017, 01:17 AM
29. Constructing Latin Squares?

I've come across some blurbs online about how to create or arrange latin squares which are complete, or quasi-complete. However the examples...

• Replies: 1
• Views: 1,632
op1
10-25-2010, 06:54 PM
30. Constucting ARMA realizations

Given estimates for the AR and MA coefficients for an ARMA(p,q) model with a non zero mean, how do I construct a realization of the time series? ...

• Replies: 0
• Views: 2,875
06-11-2008, 10:26 AM
31. contingency table

I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three...

• Replies: 0
• Views: 1,873
12-17-2013, 12:22 AM
32. Contingency tables with an expected value of 0

Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

• Replies: 6
• Views: 6,989
03-21-2011, 01:34 AM
33. Continuous approximation

Hello all, I have a couple of question regarding the same topic. I have a new treatment, which I compare to a control (in Biostatistics), and...

• Replies: 2
• Views: 1,532
08-27-2013, 02:48 PM
34. 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: 2,931
06-06-2011, 03:43 PM
35. Continuous response variable and categorical predictor - what type of analysis to use

Hi, I am dealing with data in which the IV's are not easily partitioned - participants can belong to one, two+, or none of the categories for a given...

• Replies: 4
• Views: 1,292
08-16-2014, 03:44 PM
36. continuous/categorical IV in anova

Hi, I understand that ANOVA assumes categorical IVs, and ANCOVA should be used if continuous IVs are included in the model. I am currently analyzing...

• Replies: 8
• Views: 14,902
05-23-2008, 08:33 AM
37. Contradictory Results re. Normality Tests

Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

• Replies: 15
• Views: 9,926
06-13-2011, 03:43 PM
38. Control Range - Specify appropriate terminology

The measurement of a parameter have been assigned to fall within a certain range, say 40 to 80. We call this the control range. If a measurement is...

• Replies: 0
• Views: 1,519
10-08-2014, 06:30 AM
39. Control Variable as part of the Dependent Variable - Problem? Solutions?

Dear all, I'm currently trying to figure out the following problem: I have a dependent variable which is build as the standard deviation of six...

• Replies: 2
• Views: 1,513
03-19-2015, 08:36 AM
40. control vs exposed

so i have 2 diffferent sample wherein the 1st sample is control and the 2nd sample is exposed to technology i.e in terms of exposure to Mobile...

• Replies: 0
• Views: 1,762
03-24-2014, 02:32 AM
41. Controlling for familywise error for large correlations matrix

Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

• Replies: 0
• Views: 1,784
02-19-2012, 05:21 PM
42. convenience sampling and p-values

Dear all, I am in the middle of my research. I gathered data (via convenience sampling). I intend to run PCA/EFA and then use dimensions in logistic...

• Replies: 2
• Views: 1,264
02-24-2015, 06:20 AM
43. 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: 1,651
04-15-2010, 05:21 AM
44. Convergence in LLN and CLT help!

Hi there, I am trying to figure out how convergence in law of large number and central limit theorem is affected by correlation in the random...

• Replies: 1
• Views: 1,245
03-06-2015, 08:34 AM
45. Convergent and Divergent Validity

Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

• Replies: 7
• Views: 3,594
03-06-2012, 10:30 AM
46. Convert SD and confidence intervals

Hi I want to perform a meta analysis on pain outcomes. Some studies use a 0-10 scale, others 1-10, 0-100 or 1-100. I'd like to convert the...

• Replies: 0
• Views: 1,343
05-12-2014, 11:32 AM
47. Converting 1 Distribution to Another

I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

• Replies: 5
• Views: 4,494
03-26-2010, 12:50 PM
48. Converting Correlation to Effect Size

Has anyone had experience of converting various indicators of effect size (students t, odds ratio, correlation etc.) to Cohen's d effect size? ...

• Replies: 2
• Views: 1,564
04-28-2015, 04:43 AM
49. Converting eta squared to Cohen's d

I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set. Is it possible...

• Replies: 5
• Views: 45,571
03-03-2011, 09:11 PM
50. 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: 4,456
09-24-2013, 02:25 PM
51. Correct approach to assessing correlation btn events in time domain?

Hi Folks Firstly apologies if i have posted this in the wrong section - please feel free to advise or move as appropriate, and also apologies if I'm...

• Replies: 2
• Views: 1,475
ogz
11-15-2013, 06:02 PM
52. Correct method for determining group membership

Hi, I am doing some research into what determines whether or not people gain an educational qualification in later life. My thought was to run...

• Replies: 8
• Views: 5,292
07-29-2011, 07:03 AM
53. Correct methodology when not sure of linearity for continuous response variable

I already posted on this, but haven't gotten an answer to my core question - which is, what type of statistical analysis should I run. I have...

• Replies: 1
• Views: 1,199
08-17-2014, 04:21 AM
54. Correct statistical test to compare multiple rates

Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

• Replies: 0
• Views: 959
07-20-2016, 03:38 PM
55. Correct terminology? Expected FPR vs Observed FPR

Hi. My first post here, great forum! I have a "terminology problem". I'm devising a statistical test, and it works fine but has a flaw; it is...

• Replies: 0
• Views: 2,084
10-10-2011, 03:09 AM
56. Correct test to use for research design

Hi All, would like some opinions on the correct test to use for a pretty straight forward design: I want to examine how the effect of X on Y differs...

• Replies: 2
• Views: 1,257
09-21-2013, 10:49 AM
57. Correct Use of Chi-Square?

Hi all, I am trying to test whether one group is significantly different from another in two different collections of data. I have seen that...

• Replies: 0
• Views: 1,557
08-14-2014, 02:34 AM

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