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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: 18,751
    10-11-2014, 12:02 PM Go to last post
  1. What is study population in Statistics?

    this is a question that i have to answer * you have been requested to design a study to determine the prevelence of hypertention in my area. 1....

    Started by sam197902‎, 09-20-2011 04:35 AM
    cross sectional, study population
    • Replies: 1
    • Views: 9,845
    09-20-2011, 08:50 AM Go to last post
  2. fixed or random factor for ANOVA

    I've had a discussion with a colleague over the proper way to analyse results of an experiment. We tested the performance of 6 subjects in a...

    Started by sam81‎, 09-19-2011 07:06 AM
    anova, fixed effects, random effects
    • Replies: 1
    • Views: 3,085
    09-19-2011, 08:12 PM Go to last post
  3. 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...

    Started by ThomasAG‎, 03-07-2010 03:59 PM
    • Replies: 7
    • Views: 3,935
    09-18-2011, 08:11 AM Go to last post
  4. Sample, population on Facebook

    Hello everyone, i need help verifying if my method is correct or if you can find any problems with it, and if you can i would like you to propose...

    Started by micdhack‎, 09-15-2011 05:34 AM
    • Replies: 9
    • Views: 2,956
    09-16-2011, 05:36 AM Go to last post
  5. Best test to use?

    Hi Everyone, I am trying to design a medical study and having difficult for teh best to use, in summary: Stage 1: Patients are classified into...

    Started by amanco‎, 09-15-2011 06:02 PM
    • Replies: 0
    • Views: 1,637
    09-15-2011, 06:02 PM Go to last post
  6. How to calculate credibility interval limits

    Hi everyone. My name is Choi. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting...

    Started by aamssa‎, 09-14-2011 02:52 AM
    • Replies: 2
    • Views: 5,424
    09-14-2011, 09:32 PM Go to last post
  7. paired or unpaired T-Test or even some other test?

    Hello there, I am trying to help out some students of medicine who are writing at their phd-thesis in germany. they have data from several...

    Started by Kullukschan‎, 09-14-2011 11:50 AM
    • Replies: 7
    • Views: 3,640
    09-14-2011, 07:18 PM Go to last post
  8. Bayesian Variable Transformation (solve for PDF)

    Hi I'm struggling with where to start for this variable transformation problem. X~Bin(N,p) so that p(X=x) = (N choose x) * (p^x) * (1-p)^(N-x) ...

    Started by Dwaffle‎, 09-13-2011 08:59 PM
    • Replies: 2
    • Views: 2,192
    09-14-2011, 06:11 PM Go to last post
  9. multiple levels of indepenent variable

    I have three x variables (a,b,c) and b is nested in a and c is nested in b. As you can imagine, there are over 100 levels of c and about 25 levels...

    Started by shanehall.m‎, 09-12-2011 02:34 PM
    • Replies: 2
    • Views: 2,112
    09-14-2011, 02:56 PM Go to last post
  10. Choosing a test value for a one sample t-test

    Hi all, I am trying to determine how best to test a hypothesis I have formulated. I am examining a new user interface that allows the user to...

    Started by min.emerg‎, 09-11-2011 02:21 PM
    • Replies: 11
    • Views: 4,089
    09-13-2011, 01:28 PM Go to last post
  11. Age Adjusted Rates

    So I'm trying to make my data match, in some ways, those used by the CDC (NCHS, specifically). In particular, I need to calculate age-adjusted...

    Started by bryangoodrich‎, 09-13-2011 12:28 PM
    • Replies: 0
    • Views: 2,002
    09-13-2011, 12:28 PM Go to last post
  12. Variance, means and clusters

    I have a question for you, hopefully it's not too trivial, but I a'm not an expert :) I have the distribution, within a certain population, of a...

    Started by Radioking‎, 09-13-2011 10:44 AM
    clustering, regression analysis, variance
    • Replies: 0
    • Views: 1,831
    09-13-2011, 10:44 AM Go to last post
  13. Post regression time series

    Dear Members, I need to do time series analysis. I have retail sales data of a retail company since January 2006(every month). I need to forecast...

    Started by masarimk‎, 09-09-2011 02:21 AM
    forecasting, regression analysis, time series
    • Replies: 2
    • Views: 2,181
    09-12-2011, 10:00 PM Go to last post
  14. Within-Subjects for categorical data

    Hello, I am struggling to find a suitable statistic test for one of my studies: I have 4 different conditions, and I want to test if my results...

    Started by JoniGuerrero‎, 09-12-2011 04:09 AM
    categorical, statistics, tests
    • Replies: 0
    • Views: 1,711
    09-12-2011, 04:09 AM Go to last post
  15. Standard Errors of Exponential Smoothing Coefficients

    Hello, I use SAS ETS to estimate a single exponential smoohting model. When i select the optimize option for the estimation of the smoothing...

    Started by zarasandreas‎, 09-12-2011 03:25 AM
    • Replies: 0
    • Views: 2,072
    09-12-2011, 03:25 AM Go to last post
  16. Question non-parametric version of a two-factor repeated measure ANOVA

    Hi everyone, I had planned to perform a two-factor repeated measure ANOVA on the data that I have, but the data that I am using is not normally...

    Started by min.emerg‎, 09-11-2011 08:02 AM
    • Replies: 4
    • Views: 5,105
    09-11-2011, 11:07 AM Go to last post
  17. Question Text book or article exposition on MLE (non-linear least squares) error analysis

    I am looking for a rigorous mathematical development of non-linear least squares error analysis, specially the accuracy of the MLE estimate -- either...

    Started by normvcr‎, 09-10-2011 01:02 PM
    accuracy, error, hessian, mle, variance
    • Replies: 0
    • Views: 1,510
    09-10-2011, 01:02 PM Go to last post
  18. Question about phi range in AR(1) process

    Hello, Makridakis Forecasting text book says that phi should be restricted to -1<phi<1. I thought that this restriction should exist only if we...

    Started by zarasandreas‎, 09-08-2011 04:29 AM
    • Replies: 4
    • Views: 5,198
    09-08-2011, 02:08 PM Go to last post
  19. Question about theta range in MA(1) processes

    Hello, According to forecasting textbooks (e.g. Diebold, Makridakis etc) the theta coefficient in an MA(1) model should be between -1 and 1...

    Started by zarasandreas‎, 09-08-2011 03:51 AM
    • Replies: 1
    • Views: 4,035
    09-08-2011, 08:45 AM Go to last post
  20. Shapiro-Wilk normality test: what is the null distribution

    Hi everyone The Title says it all. I'd like to know what is the null distribution of the Shapiro-Wilk test statistic. I'm also curious to see it's...

    Started by longrob‎, 09-07-2011 09:10 AM
    • Replies: 4
    • Views: 5,173
    09-08-2011, 04:16 AM Go to last post
  21. single Likert scale question analysis

    I work for a holiday company which uses a 7 grade Likert scale questionnaire to collect feedback from our guests. This is my first foray into...

    Started by Percepto‎, 09-02-2011 05:41 PM
    analysis, average., evaluate, likert, ordinal
    • Replies: 2
    • Views: 3,761
    09-08-2011, 03:57 AM Go to last post
  22. different intercept with Multinomial vs Binomial Logistic?

    I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

    Started by chipsens‎, 09-06-2011 03:02 PM
    logistic regression
    • Replies: 0
    • Views: 2,691
    09-06-2011, 03:02 PM Go to last post
  23. Lightbulb Using "AIC per sample" to compare logistic regression models

    I'm generating nested models using logistic regression and comparing them by AIC. One issue that arises is that not all samples have all...

    Started by bernoulli‎, 09-05-2011 05:33 PM
    aic, likelihood, logistic regression
    • Replies: 1
    • Views: 2,434
    09-05-2011, 10:34 PM Go to last post
  24. test which of two models is better predictor -- but the two are correlated with each

    Dear All -- Can anyone please please help me? I have a dichotomous dependent variable Y There are two alternative models for predicting Y The...

    Started by dbodoff‎, 06-22-2011 09:45 PM
    • Replies: 6
    • Views: 3,490
    09-02-2011, 06:46 PM Go to last post
  25. Using mean measures in ANOVA

    Hi everyone, I'm a bit confused. I have conducted a within-subjects experiment to evaluate a new user interface. I have two independent variables:...

    Started by min.emerg‎, 09-01-2011 03:52 PM
    anova
    • Replies: 0
    • Views: 1,553
    09-01-2011, 03:52 PM Go to last post
  26. Fisher's exact test

    I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count...

    Started by shanehall.m‎, 08-31-2011 09:46 AM
    categorical data, chi square, exact test, post hoc test
    • Replies: 3
    • Views: 8,908
    09-01-2011, 02:02 PM Go to last post
  27. Normality Assumption

    Say there is 100 observations, but these observations are equally broken into 2 genders and 5 cities. When creating a qq plot or just checking...

    Started by shanehall.m‎, 08-31-2011 09:00 AM
    assumptions, normality, quality
    • Replies: 3
    • Views: 2,439
    09-01-2011, 01:39 PM Go to last post
  28. Ideas with paired data

    Yesterday I was lucky enough to work with a statistician from another section in my division. He took me along on one of the consultations he...

    Started by bryangoodrich‎, 08-31-2011 12:17 PM
    • Replies: 5
    • Views: 3,913
    08-31-2011, 04:45 PM Go to last post
  29. Tails and QQ Plot

    Does Anybody know if exists a formal proof about the well known properties of the qq plot? "families of symmetrical distributions with tails heavier...

    Started by Malacorda‎, 08-31-2011 08:42 AM
    • Replies: 0
    • Views: 4,724
    08-31-2011, 08:42 AM Go to last post
  30. non parametric hierarchical regression?

    Hello, I have non parametric data and need to condcut a regression with covariates as well. I have tried to transform the data but still they are...

    Started by fliss‎, 08-30-2011 12:06 PM
    • Replies: 4
    • Views: 5,563
    08-30-2011, 03:43 PM Go to last post
  31. Request for help on deciding how to analyse some data

    I have a group of students who have data for % Attendance before and % Attendance after These students can be split by various factors, depending...

    Started by gdmorgan‎, 08-25-2011 10:33 AM
    • Replies: 2
    • Views: 2,163
    08-30-2011, 03:02 AM Go to last post
  32. Graduates grades- how to standardize by subject?

    Hello! This is probably rather basic, but I'd appreciate any input. The sample: I have survey responses from a sample of about 4000 German...

    Started by siskin‎, 08-23-2011 07:43 AM
    • Replies: 2
    • Views: 2,321
    08-30-2011, 03:00 AM Go to last post
  33. Repeated measure ANOVA shows a significant difference but not post-hoc analysis

    Hi, I am kind of new to statistics and I did a comparison that I can't really digest its results. My participants rated the usefulness of 7...

    Started by peejay‎, 08-29-2011 01:35 PM
    • Replies: 2
    • Views: 7,558
    08-29-2011, 04:08 PM Go to last post
  34. Smile DF and fishers vs. pearson's

    Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

    Started by drewmac‎, 08-28-2011 07:38 PM
    binomial, chi, degrees of freedom, fisher, pearson
    • Replies: 3
    • Views: 2,606
    08-29-2011, 12:04 PM Go to last post
  35. Best design for this experiment?

    Hello all. I am having some trouble with my experiment and would be the best way to analyze the data. I have 4 different chemicals each at one...

    Started by daelve‎, 08-25-2011 07:08 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,909
    08-26-2011, 04:55 PM Go to last post
  36. Coding Data

    I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

    Started by eagle12‎, 08-24-2011 09:59 PM
    2 Pages
    1 2
    coding, correlation, data, research design
    • Replies: 21
    • Views: 5,737
    08-26-2011, 09:30 AM Go to last post
  37. Power

    Hi there, I need some help getting my head around this power concept. If there's a small but important effect, should you try and find it...

    Started by danony‎, 08-24-2011 06:25 PM
    • Replies: 9
    • Views: 2,424
    08-25-2011, 08:35 PM Go to last post
  38. On what statistical significance test should I use

    Hi everyone, First and foremost, my skills in statistics are quite basic so what I am about to ask may sound very stupid. That being said, here...

    Started by Applepip‎, 08-22-2011 06:22 PM
    • Replies: 7
    • Views: 2,263
    08-24-2011, 01:33 PM Go to last post
  39. analyse of likert scale confusion please help

    Hello I am conducting research into how behvaviour changes from year 1 to year 2 of study on a college course. I have provided students with a...

    Started by mhowells3‎, 02-23-2011 05:22 PM
    • Replies: 9
    • Views: 5,104
    08-23-2011, 07:58 PM Go to last post
  40. How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

    Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

    Started by ein8horn‎, 08-21-2011 05:46 PM
    anova, apa, marginal, means, report
    • Replies: 0
    • Views: 6,531
    08-21-2011, 05:46 PM Go to last post
  41. Accelerated Bootstrap - mediation

    Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

    Started by danony‎, 08-20-2011 05:01 AM
    • Replies: 2
    • Views: 5,029
    08-20-2011, 04:15 PM Go to last post
  42. Poll Poll: do my model considered fit in AMOS?

    Dear all members, I m hereby new members and currently conducting research on organization behavior areas. I need help from all of you. I am very...

    Started by harianto‎, 02-28-2011 02:13 AM
    • Replies: 3
    • Views: 13,337
    08-20-2011, 01:22 AM Go to last post
  43. Package testing using likert scale

    We recently finished a survey using a likert scale to compare attributes of consumer packaging(sample question below). The same question was asked...

    Started by chese79‎, 08-19-2011 04:44 PM
    likert, likert interpretation, likert scale
    • Replies: 0
    • Views: 2,488
    08-19-2011, 04:44 PM Go to last post
  44. How to estimate two series covariance with unlined observed data?

    Sorry if I use the wrong terminology. My problem is, suppose I have two time series, they change every day. However, I can only observe them...

    Started by hslinhc‎, 08-17-2011 09:28 PM
    • Replies: 1
    • Views: 1,911
    08-17-2011, 10:22 PM Go to last post
  45. Tool to suggest on sample selection

    I have data which can be represented in a cube (3 dimension) and altogether number of instances(population) are very high. I want to select a fair...

    Started by suranjithe‎, 08-16-2011 11:38 PM
    • Replies: 1
    • Views: 1,812
    08-17-2011, 10:32 AM Go to last post
  46. Help!SEM fitting index all failed,tho reliability and validity test passed.Reason?!

    Dear all brilliant members, I am a new analyzing thesis data. Im conducting a survey about people's behavior intention, but i came into a serious...

    Started by autumnwu‎, 08-17-2011 07:17 AM
    • Replies: 0
    • Views: 1,609
    08-17-2011, 07:17 AM Go to last post
  47. Was thinking Kendall's Tau but...(correlation)

    Hey guys, I was wondering if you could help me out with this: I have seven sites along the west coast each with two types of data and several...

    Started by aesopclimber‎, 07-20-2011 11:39 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,148
    08-15-2011, 08:06 PM Go to last post
  48. Exclamation repeated measure

    :shakehead Hey there, I'm a bit confused about what is meant with repeated measure, it is applicable only in a case when a drug or treatment is...

    Started by Tiziana‎, 08-15-2011 10:13 AM
    • Replies: 1
    • Views: 1,570
    08-15-2011, 12:27 PM Go to last post
  49. Post Bic

    I am a graduate student who wants to learn more about the Bayesian information criterion (BIC) for a project I am working on. What do you think is...

    Started by krjames1‎, 08-11-2011 09:51 PM
    • Replies: 0
    • Views: 1,602
    08-11-2011, 09:51 PM Go to last post
  50. R^2 in Shrinkage Estimators

    I am just learning about Shrinkage Estimators. I was wondering how R^2 would be defined for this. I have googled a bit but did not really get...

    Started by sak‎, 08-11-2011 09:36 AM
    • Replies: 1
    • Views: 2,135
    08-11-2011, 03:35 PM Go to last post
  51. Minimum Sample Size for a Survey

    Hi guys, Here's a question I've been struggling with over the past week. My employer would like to perform a survey to gauge public opinion on a...

    Started by gstab‎, 08-11-2011 01:52 PM
    sample size, survey research design
    • Replies: 3
    • Views: 2,685
    08-11-2011, 02:21 PM Go to last post
  52. How do I determine the Correlation Coefficient from a best fitting equation.

    I'm confused about how to determine the correlation coefficient after you find a linear regression line formula. I'm porting some linear...

    Started by Daniel Savage‎, 08-11-2011 11:32 AM
    • Replies: 0
    • Views: 1,838
    08-11-2011, 11:32 AM Go to last post
  53. panel data

    Hey guys, I'm analyzing cash flows from companies. I have panel data lined up that includes 4 companies with 2 years worth of cash flows. Data is...

    Started by sfspitfire23‎, 08-10-2011 10:55 AM
    • Replies: 1
    • Views: 1,750
    08-10-2011, 04:52 PM Go to last post
  54. What test can I use to compare categorical and continuous variables?

    Hello guys: I have two sets of data, actual outcome (live vs. dead), which is categorical, and a risk adjustment predicted outcome, which is...

    Started by scerab‎, 08-09-2011 03:44 AM
    • Replies: 14
    • Views: 13,048
    08-09-2011, 02:58 PM Go to last post
  55. 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: 3,270
    08-09-2011, 01:57 PM Go to last post
  56. Equivalent to RMSE for logistic regression?

    I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally...

    Started by chipsens‎, 08-09-2011 09:58 AM
    prediction, rmse
    • Replies: 1
    • Views: 6,481
    08-09-2011, 10:54 AM Go to last post
  57. cross-validation of prognostic model (test-set method)

    I am cross-validating a logistic regression model using the test-set approach, with 70% training data in the test set and 30% in the validation "set"...

    Started by chipsens‎, 08-09-2011 08:23 AM
    cross-validation, regression, test-set
    • Replies: 0
    • Views: 2,390
    08-09-2011, 08:23 AM Go to last post
  58. Which Correlation is correct?

    Hi there, I'm having a bit of a problem with the last bit of analysis for my thesis. I would like to compare wave exposure of sites along the U.S....

    Started by aesopclimber‎, 08-09-2011 12:00 AM
    • Replies: 1
    • Views: 1,377
    08-09-2011, 12:07 AM Go to last post
  59. Analysis for MSc - multiple regression?

    Hi everyone, I hope someone wouldn't mind checking I am on the right track with the stats for my MSc project (recovery times in reptiles...

    Started by Frizzp‎, 08-08-2011 04:10 AM
    • Replies: 1
    • Views: 1,639
    08-08-2011, 11:38 AM Go to last post
  60. Linear Mixed Models in SPSS for repeated measures

    I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

    Started by Elvin Roest‎, 08-04-2011 05:16 PM
    • Replies: 13
    • Views: 12,665
    08-08-2011, 04:38 AM Go to last post

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