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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread 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...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,662
    10-11-2014, 12:02 PM Go to last post
  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...

    Started by anjan_purkayastha‎, 10-13-2008 12:29 PM
    • Replies: 0
    • Views: 3,353
    10-13-2008, 12:29 PM Go to last post
  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...

    Started by AndrewTheSeer‎, 09-21-2009 09:14 PM
    • Replies: 0
    • Views: 3,350
    09-21-2009, 09:14 PM Go to last post
  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...

    Started by aarong‎, 07-14-2011 01:58 PM
    • Replies: 1
    • Views: 3,350
    07-14-2011, 05:42 PM Go to last post
  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...

    Started by chaoninja‎, 03-05-2011 07:18 PM
    • Replies: 7
    • Views: 3,347
    03-07-2011, 02:59 AM Go to last post
  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...

    Started by Londoner‎, 08-13-2014 04:32 AM
    • Replies: 3
    • Views: 3,344
    08-13-2014, 10:57 AM Go to last post
  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...

    Started by Astrostatistics‎, 10-12-2010 05:40 PM
    • Replies: 1
    • Views: 3,343
    10-12-2010, 06:05 PM Go to last post
  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...

    Started by Tiffiny‎, 02-05-2012 06:02 AM
    dissertation, power calculation, sample size
    • Replies: 0
    • Views: 3,343
    02-05-2012, 06:02 AM Go to last post
  8. Transforming a variable to be normally distributed

    Hey guys, I was having trouble and figured that maybe one of the vet's here could help. I'm setting up a linear regression model for this class...

    Started by Link‎, 11-22-2010 03:05 PM
    • Replies: 2
    • Views: 3,342
    11-22-2010, 03:32 PM Go to last post
  9. 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...

    Started by PeterVincent‎, 07-26-2011 05:59 AM
    • Replies: 2
    • Views: 3,335
    07-28-2011, 05:10 AM Go to last post
  10. 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...

    Started by cs_ut‎, 11-07-2016 05:34 PM
    • Replies: 3
    • Views: 3,334
    11-08-2016, 08:35 AM Go to last post
  11. 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,...

    Started by edju‎, 01-15-2011 07:03 PM
    • Replies: 2
    • Views: 3,332
    01-16-2011, 02:10 PM Go to last post
  12. 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...

    Started by weiaijiayou‎, 11-07-2011 01:22 AM
    mixed models, spss
    • Replies: 5
    • Views: 3,332
    11-10-2011, 05:29 PM Go to last post
  13. 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...

    Started by tsukiko‎, 03-23-2010 03:42 AM
    • Replies: 6
    • Views: 3,331
    03-24-2010, 06:06 AM Go to last post
  14. Question 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...

    Started by supertoket‎, 07-16-2013 03:59 PM
    independent observations, t-test
    • Replies: 4
    • Views: 3,327
    07-18-2013, 02:33 PM Go to last post
  15. 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...

    Started by djshusko‎, 06-13-2007 09:20 AM
    • Replies: 4
    • Views: 3,326
    06-15-2007, 01:34 PM Go to last post
  16. 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...

    Started by micdhack‎, 02-09-2011 08:03 AM
    • Replies: 0
    • Views: 3,326
    02-09-2011, 08:03 AM Go to last post
  17. 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...

    Started by nedjarh‎, 02-09-2011 09:47 AM
    • Replies: 0
    • Views: 3,325
    02-09-2011, 09:47 AM Go to last post
  18. Full factorial design

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

    Started by mp83‎, 01-19-2010 08:14 AM
    • Replies: 0
    • Views: 3,324
    01-19-2010, 08:14 AM Go to last post
  19. 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...

    Started by rcclark2‎, 09-23-2010 06:20 PM
    • Replies: 0
    • Views: 3,319
    09-23-2010, 06:20 PM Go to last post
  20. 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...

    Started by DenisD‎, 04-10-2013 06:49 AM
    • Replies: 3
    • Views: 3,316
    04-10-2013, 10:56 AM Go to last post
  21. 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...

    Started by hslinhc‎, 12-04-2010 05:28 PM
    • Replies: 0
    • Views: 3,311
    12-04-2010, 05:28 PM Go to last post
  22. Post 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...

    Started by dtae‎, 01-09-2011 02:04 PM
    continuous, correlation, interaction, regression, z-score
    • Replies: 0
    • Views: 3,311
    01-09-2011, 02:04 PM Go to last post
  23. 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...

    Started by paolo72‎, 01-25-2012 05:56 AM
    • Replies: 0
    • Views: 3,307
    01-25-2012, 05:56 AM Go to last post
  24. 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...

    Started by dissstat1‎, 04-08-2011 08:07 PM
    • Replies: 4
    • Views: 3,306
    04-11-2011, 05:29 PM Go to last post
  25. 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...

    Started by NN_STAT‎, 08-04-2011 01:29 AM
    • Replies: 4
    • Views: 3,305
    08-04-2011, 02:28 PM Go to last post
  26. 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...

    Started by cherries‎, 12-18-2012 04:18 PM
    • Replies: 0
    • Views: 3,301
    12-18-2012, 04:18 PM Go to last post
  27. Interpreting (negative) LDA classifier scores

    Hi, I performed an LDA in R using the lda() function. To my knowledge, this implements the LDA by Rao, 1948. From the results I derived the...

    Started by Fiete‎, 12-06-2013 05:40 PM
    • Replies: 0
    • Views: 3,301
    12-06-2013, 05:40 PM Go to last post
  28. 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,...

    Started by Vova‎, 11-24-2016 03:31 PM
    • Replies: 0
    • Views: 3,300
    11-24-2016, 03:31 PM Go to last post
  29. 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...

    Started by maxim333‎, 11-18-2008 09:00 AM
    • Replies: 3
    • Views: 3,298
    11-19-2008, 12:31 AM Go to last post
  30. Question 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...

    Started by tehnik‎, 11-13-2016 01:31 PM
    • Replies: 2
    • Views: 3,296
    12-12-2016, 12:15 PM Go to last post
  31. 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...

    Started by KristieK‎, 08-29-2009 07:06 AM
    • Replies: 0
    • Views: 3,295
    08-29-2009, 07:06 AM Go to last post
  32. Question research statistics (really stuck)

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

    Started by Jack Florence‎, 11-14-2016 04:21 PM
    • Replies: 0
    • Views: 3,293
    11-14-2016, 04:21 PM Go to last post
  33. Cool Please help! T-test results & interpretation

    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...

    Started by Joelle‎, 11-06-2011 07:07 AM
    anova, t-test
    • Replies: 3
    • Views: 3,291
    11-08-2011, 09:11 PM Go to last post
  34. 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...

    Started by kmajal‎, 10-18-2008 01:26 PM
    • Replies: 2
    • Views: 3,290
    10-19-2008, 06:06 AM Go to last post
  35. Chi-square test

    Hi all, I'm new here and am doing some research and am certainly not a statistician. Basically I have a dataset with patients who have reported drug...

    Started by fred_1‎, 06-28-2011 04:22 PM
    • Replies: 5
    • Views: 3,288
    07-13-2011, 06:58 AM Go to last post
  36. 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...

    Started by leafonthewind‎, 03-23-2016 01:13 PM
    confidence intervals, independent events, p value, research article
    • Replies: 3
    • Views: 3,284
    03-24-2016, 07:42 AM Go to last post
  37. 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...

    Started by Bekos‎, 07-19-2013 02:34 AM
    mcmc, metropolis-hastings
    • Replies: 2
    • Views: 3,282
    02-08-2016, 11:05 PM Go to last post
  38. 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...

    Started by WeeG‎, 06-08-2010 06:21 AM
    • Replies: 11
    • Views: 3,280
    06-10-2010, 01:17 PM Go to last post
  39. Question 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...

    Started by free_radicals‎, 06-22-2012 12:52 PM
    • Replies: 2
    • Views: 3,280
    06-22-2012, 06:37 PM Go to last post
  40. 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...

    Started by Petes‎, 12-11-2012 04:25 AM
    • Replies: 1
    • Views: 3,278
    02-08-2015, 09:48 AM Go to last post
  41. 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...

    Started by sampahmel‎, 11-18-2011 05:25 PM
    • Replies: 2
    • Views: 3,277
    11-18-2011, 06:20 PM Go to last post
  42. 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...

    Started by Hafsah‎, 11-21-2016 01:51 PM
    • Replies: 0
    • Views: 3,275
    11-21-2016, 01:51 PM Go to last post
  43. Red face 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...

    Started by yayo1984‎, 09-13-2010 01:40 AM
    • Replies: 11
    • Views: 3,271
    09-13-2010, 08:34 PM Go to last post
  44. Buy-response survey!

    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...

    Started by kenniwr‎, 09-13-2012 02:59 AM
    • Replies: 0
    • Views: 3,270
    09-13-2012, 02:59 AM Go to last post
  45. 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...

    Started by leo nidas‎, 11-28-2010 01:45 PM
    • Replies: 2
    • Views: 3,264
    11-28-2010, 03:00 PM Go to last post
  46. 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...

    Started by chardinej‎, 02-28-2011 10:07 AM
    bootstrap, large, resampling, samples
    • Replies: 1
    • Views: 3,262
    02-28-2011, 12:51 PM Go to last post
  47. Unhappy 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...

    Started by bpivotto‎, 10-10-2014 07:10 AM
    correlation analysis, mbe, rmse
    • Replies: 1
    • Views: 3,261
    10-10-2014, 07:10 AM Go to last post
  48. 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...

    Started by Johanna_MonkeyStats‎, 09-08-2011 12:48 PM
    • Replies: 3
    • Views: 3,258
    02-08-2012, 03:05 PM Go to last post
  49. Holt's Exponential Smoothing Vs Brown Double Exponential Smoothing

    Hello, According to books Brown Double Exponential Smoothing (one parameter=alpha) is a special case of Holt's Linear Exponential Smoothing (two...

    Started by zarasandreas‎, 01-10-2012 05:51 AM
    • Replies: 0
    • Views: 3,250
    01-10-2012, 05:51 AM Go to last post
  50. 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...

    Started by aahh1982‎, 12-11-2010 08:45 PM
    • Replies: 0
    • Views: 3,249
    12-11-2010, 08:45 PM Go to last post
  51. 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...

    Started by Officer Pupp‎, 11-04-2008 09:15 AM
    • Replies: 5
    • Views: 3,248
    11-10-2008, 04:27 PM Go to last post
  52. 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:...

    Started by Ali Ali‎, 09-15-2013 08:50 PM
    • Replies: 0
    • Views: 3,246
    09-15-2013, 08:50 PM Go to last post
  53. 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...

    Started by yosam1023‎, 08-09-2011 10:53 AM
    correlation, time series analysis
    • Replies: 1
    • Views: 3,245
    08-09-2011, 01:57 PM Go to last post
  54. 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...

    Started by eunkum‎, 04-18-2013 12:02 PM
    • Replies: 5
    • Views: 3,244
    06-16-2013, 01:46 PM Go to last post
  55. Question Question About K-Means

    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...

    Started by Kam36‎, 06-03-2008 05:11 PM
    • Replies: 4
    • Views: 3,242
    06-03-2008, 07:20 PM Go to last post
  56. Smile 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...

    Started by loglikely‎, 07-17-2012 02:35 PM
    • Replies: 14
    • Views: 3,239
    08-13-2012, 05:17 PM Go to last post
  57. Central Limit Theorem

    Hi guys, According to the central limit theorem, if I have a sample of n independent variables X1,....Xn, from ANY distribution, the sample mean...

    Started by WeeG‎, 05-03-2010 02:20 AM
    • Replies: 1
    • Views: 3,238
    05-03-2010, 06:51 AM Go to last post
  58. Question 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++ ...

    Started by marcC‎, 07-28-2009 06:02 AM
    • Replies: 0
    • Views: 3,237
    07-28-2009, 06:02 AM Go to last post
  59. 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...

    Started by sezbean‎, 10-05-2011 04:49 AM
    • Replies: 1
    • Views: 3,236
    10-05-2011, 11:02 AM Go to last post
  60. 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...

    Started by leo nidas‎, 08-28-2009 03:20 PM
    • Replies: 2
    • Views: 3,231
    08-30-2009, 03:33 PM Go to last post

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