1. Announcement:
05-10-2017
Views:
1,814
Page 13 of 54 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ... Last
Threads 721 to 780 of 3193

# 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. ### Fisher's z transformation in path analysis

Hi guys. I am a psychology honours student doing my thesis by producing a path analysis that I ran with two different samples - one with a younger...

• Replies: 0
• Views: 3,350
09-21-2009, 09:14 PM
3. ### Npar K-S test acceptable for normailty test??

hi just testing parametric assumptions and realised that they are 2 ways to check Kolmogorov-Smirnov Test. 1) Analyze-Nonparametric Tests-1-Sample...

• Replies: 1
• Views: 3,350
07-14-2011, 05:42 PM
4. ### Any way to test significance?

First off, pardon my novice-level knowledge of statistics. If I make any ridiculous assumptions or whatever, this is why! So I'm doing a bit of...

• Replies: 7
• Views: 3,347
03-07-2011, 02:59 AM
5. ### Standardizing non-normally distributed data?

Hi everyone, I'm working on a project at the moment that aims to compare subjects based on different characteristics. At the moment, I am looking...

• Replies: 3
• Views: 3,344
08-13-2014, 10:57 AM
6. ### Uncertainty in Sample Dispersion

I'm an astronomer and I have a statistics question that I'm not sure how to answer. I'll try to generalize the problem in a clear way. I have a...

• Replies: 1
• Views: 3,343
10-12-2010, 06:05 PM
7. ### Calculating Sample Size for a prospective/longitudinal study

I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

• Replies: 0
• Views: 3,343
02-05-2012, 06:02 AM
8. ### Sampling error & meaning of level of significance (AKA alpha)

My understanding of alpha the level of significance is that in a large number of hypothesis tests the null will be rejected percentage alpha times...

• Replies: 2
• Views: 3,335
07-28-2011, 05:10 AM
9. ### Question - Is Simpson's Paradox the same as spuriousness

Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

• Replies: 3
• Views: 3,334
11-08-2016, 08:35 AM
10. ### 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: 3,332
01-16-2011, 02:10 PM
11. ### Mixed models in SPSS -- swapping predictor and predicted?

Hi, I'm working on a project where I have repeated measures of a (continuous) IV and DV. At each measurement "time" I would like to predict the...

• Replies: 5
• Views: 3,332
11-10-2011, 05:29 PM
12. ### Random no, mle,method of moments

Hi. 1. I generate a random sample x=(x1,…,xn) of size n from dist A with parameters (a1,a2) in R. 2. I have a likelihood function which involves...

• Replies: 6
• Views: 3,331
03-24-2010, 06:06 AM
13. ### 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: 3,327
07-18-2013, 02:33 PM
14. ### Regression Method

I need to create a software algorithm to calculate cubic or quartic regression on an array of values, but it's been a while since my last stats...

• Replies: 4
• Views: 3,326
06-15-2007, 01:34 PM
15. ### Normalizing the distribution of time data

Hello everybody, i have time data from a test that was conducted online. Basically the time that took for every user to complete each page of the...

• Replies: 0
• Views: 3,326
02-09-2011, 08:03 AM
16. ### Calibration for COX model

Hi everyone, I'm looking for the methodology to compute the calibration of the COX model with time-dependent, I found few articles on the net...

• Replies: 0
• Views: 3,325
02-09-2011, 09:47 AM
17. ### Full factorial design

I have the followinf situation for a full factorial design. Estimated Effects and Coefficients ________t____ p-value...

• Replies: 0
• Views: 3,324
01-19-2010, 08:14 AM
18. ### Measuring the Association between Nominal variables

I currently have a sizable dataset containing question-answer variables with multiple levels (4-8) that are unordered and a variable Id like to...

• Replies: 0
• Views: 3,319
09-23-2010, 06:20 PM
19. ### Ordinal data analysis and hypothesis testing

Hello, I have been working on a survey analysis and have to test hypothesis if the specified kind of software resulted in increased performance of...

• Replies: 3
• Views: 3,316
04-10-2013, 10:56 AM
20. ### How do we do statistics on repeated phenomenon?

Hi everyone, I've got a question on statistics on repeated phenomenons. For example, If I have a time series data which I used exploratory data...

• Replies: 0
• Views: 3,311
12-04-2010, 05:28 PM
21. ### 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: 3,311
01-09-2011, 02:04 PM
22. ### Help to compute expected value of matrix product

Hello, I have this problem to solve which is driving me crazy: I have the following matrices g = ' where .* here means Hadamard product and...

• Replies: 0
• Views: 3,307
01-25-2012, 05:56 AM
23. ### Distribution not normal

Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

• Replies: 4
• Views: 3,306
04-11-2011, 05:29 PM
24. ### Series of T-Tests

Hi All, I have a theoretical question... I have a categorical variable with two levels, and around 200 continuous variables. I wanted to check...

• Replies: 4
• Views: 3,305
08-04-2011, 02:28 PM
25. ### Levene's test of equality of error variances Repeated measures

Hello all, RE: Levene's test of equality of error variances Repeated measures...What do I do if one of my time points is significant (not equal...

• Replies: 0
• Views: 3,301
12-18-2012, 04:18 PM
26. ### How to deal with unknown distribution?

I have a game with two players. Player 1's type is publicly known, while player 2's type is unknown (privately known to him) and distributed, say,...

• Replies: 0
• Views: 3,300
11-24-2016, 03:31 PM
27. ### Hypothesis design

Hi, I have a question regarding hypothesis design. In other words, how to properly assign H0 and H1. For example, if I have statement: Some drug...

• Replies: 3
• Views: 3,298
11-19-2008, 12:31 AM
28. ### How to analyze two opposing sides survey results?

Hi! I am doing a research between two b2b sides that are cooperating. I have already made one survey and about to do the other. The point is to...

• Replies: 2
• Views: 3,296
12-12-2016, 12:15 PM
29. ### Do I have a problem with simultaneity here??

Hi, I am modelling the demand for imported rice for a sample of countries. The price of imports, one of the explanatory variables, is assumed to...

• Replies: 0
• Views: 3,295
08-29-2009, 07:06 AM
30. ### Question research statistics (really stuck)

-------------------------------------------------------------------------------- This is a question pertaining to a real-life data analysis. It is...

• Replies: 0
• Views: 3,293
11-14-2016, 04:21 PM

Hi, please help me with this simple question that no one at my uni seems to be able to answer! I have 3 groups (n=20) where I'm looking to...

• Replies: 3
• Views: 3,291
11-08-2011, 09:11 PM
32. ### Quick Question about Null Effects in ANOVAs

Hi all, I just have one quick question: I've been analysing a reasonably large experiment recently using a repeated-measures ANOVA (with a...

• Replies: 2
• Views: 3,290
10-19-2008, 06:06 AM
33. ### 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
34. ### 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
35. ### Mle

Hi guys, I need advice regarding this question: The height of students at university is a random variable from the N(\mu,25) distribution. A...

• Replies: 11
• Views: 3,280
06-10-2010, 01:17 PM
36. ### Paired t-test VS Anova

I'm reading an article which is comparing the effects of three variables. But the authors used several paired t-tests to measure two variables at a...

• Replies: 2
• Views: 3,280
06-22-2012, 06:37 PM
37. ### ANOVA not significant but Tukey is

I'm still new to stats and would like to know if the results below indicate significance, or at least a trend. Being compared are three independent...

• Replies: 1
• Views: 3,278
02-08-2015, 09:48 AM
38. ### using non-parametric test as robustness check

hi all, I know the data are normally distributed (as indicated by Kolmogorov Smirnov). But when I use rank test to confirm hypothesis testing...

• Replies: 2
• Views: 3,277
11-18-2011, 06:20 PM
39. ### Data analysis

Hi, please can someone help me out. I would like to know if I have performed the correct analysis for my study. I am comparing direct response...

• Replies: 0
• Views: 3,275
11-21-2016, 01:51 PM
40. ### 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

Hello, I'm about to initiate a price research where I'll examine the optimal price for a product. For the method I'm planning to to a...

• Replies: 0
• Views: 3,270
09-13-2012, 02:59 AM
42. ### resampling CI

Hi there, I have a question regarding the bootstrap. Suppose you want to run a simulation about estimating an unknown parameter θ. Suppose...

• Replies: 2
• Views: 3,264
11-28-2010, 03:00 PM
43. ### large samples and resampling stats

First post here. Mods- please move thread if in wrong place. I am working with a very large dataset (total n = 30,000+) of normally distributed...

• Replies: 1
• Views: 3,262
02-28-2011, 12:51 PM
44. ### MBE, RMSE of two series of data, correlation.

I have a series of Data generated as output of a mathematical model which I already know the MBE and RMSE (real measured values and simulated ones by...

• Replies: 1
• Views: 3,261
10-10-2014, 07:10 AM
45. ### Comparing activity budgets, before and after

Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

• Replies: 3
• Views: 3,258
02-08-2012, 03:05 PM
46. ### Finding cyclic function from points with more than 2 indep. variables

Hello, I am doing my master thesis in Electrical engineering about the impact of the humidity and temperature on power consumption I have a...

• Replies: 0
• Views: 3,249
12-11-2010, 08:45 PM
47. ### Factor Analysis Question

Hi everyone, I'm a Trainee Clinical Psychologist, not a statistician but we have research to do as part of our training so I'm hoping someone here...

• Replies: 5
• Views: 3,248
11-10-2008, 04:27 PM
48. ### white test for heteroskedasticity

Hi everyone In STATA, how to inerpret the results of the heteroskedasticity test? I typed in imtest, white to do the test, and got these results:...

• Replies: 0
• Views: 3,246
09-15-2013, 08:50 PM
49. ### Correlation Over Time

Hello, I have data regarding the number of blood cells, and the number of a certain protein associated with blood cells, from 15 blood samples at...

• Replies: 1
• Views: 3,245
08-09-2011, 01:57 PM
50. ### multivariate logistic regression

I want to do multivariate logistic regression. Does it mean "one logistic regression with 2 dependent variables at the same time? Or Does it mean...

• Replies: 5
• Views: 3,244
szm
06-16-2013, 01:46 PM

I'm currently working on a project that looks at clustering retail stores on the bases of their Sales performance by item class. Items that are sold...

• Replies: 4
• Views: 3,242
06-03-2008, 07:20 PM
52. ### 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
53. ### How to compute significance here? (And why?)

Hello, method test_set_size correct accuracy A 898 188 0.209 A+ 898 210 0.234 A++ ...

• Replies: 0
• Views: 3,237
07-28-2009, 06:02 AM
54. ### Interpreting Likert Scale

Hi everyone, this is my first post and I'd really appreciate any help: I am completing an ethics application for my research and have been asked to...

• Replies: 1
• Views: 3,236
10-05-2011, 11:02 AM
55. ### mathematics (is it a differential equation?)

Hi there, Well I know I'll sound rusty in mathematics but here I go: Let a vector b=. I know the derivatives dQ/db0 and dQ/db1. I am...

• Replies: 2
• Views: 3,231
08-30-2009, 03:33 PM

Page 13 of 54 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.