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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: 18,727
    10-11-2014, 12:02 PM Go to last post
  1. how to determine the sample size needed for logit model

    how to determine the sample size needed for logit model? we are currently working on a thesis.

    Started by Anthny Garc‎, 08-02-2011 01:46 AM
    • Replies: 1
    • Views: 3,456
    08-03-2011, 12:12 AM Go to last post
  2. data not normally distributed

    Hi, I had originally intended to use a mixed repeated measures anova to test my data, however unfortunately it is not normally distributed and so...

    Started by bubu‎, 08-04-2011 10:06 AM
    • Replies: 1
    • Views: 2,116
    08-04-2011, 10:19 AM Go to last post
  3. Chernoff Faces Taken Seriously?

    Often I come across web articles or books mention Chernoff faces as a way to efficiently express multivariate data with up to 10 different numeric...

    Started by trinker‎, 08-04-2011 11:28 AM
    • Replies: 1
    • Views: 2,820
    08-04-2011, 11:37 AM Go to last post
  4. 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: 3,321
    08-04-2011, 02:28 PM Go to last post
  5. Using statistical analysis to show hybrid performance gains

    Are there any statistical analysis techniques that i can use for the following scenario? As part of my report, i was asked to study the fuel...

    Started by amahesh2012‎, 07-28-2011 07:16 AM
    • Replies: 1
    • Views: 1,610
    08-04-2011, 02:38 PM Go to last post
  6. how to determine sample size for on-farm strip trials

    We have been doing on-farm strip trials (with two treatments: normal rate and normal+50 rate of fertilizer) for 3 years. Because we have farmers...

    Started by leiniao‎, 08-03-2011 01:22 PM
    • Replies: 1
    • Views: 1,901
    08-04-2011, 05:21 PM Go to last post
  7. Lightbulb Help with attribution/causality

    Hello everyone! I am new to this forum, but excited to become more involved :tup: I am currently a mathematics/statistics student and I am looking...

    Started by JesusWalks‎, 08-03-2011 12:49 PM
    attribution, causality, ecological statistics, model, statistics
    • Replies: 1
    • Views: 2,763
    08-04-2011, 05:23 PM Go to last post
  8. power analysis for parameter estimation of a gamma distribution?

    How do I calculate the needed sample size to determine if the parameter estimates are accurate enough for a gamma distribution? Thanks.

    Started by manoa‎, 08-03-2011 09:23 PM
    • Replies: 10
    • Views: 3,637
    08-04-2011, 05:30 PM Go to last post
  9. data simulation help

    Hi all, How do I generate count data from a gamma distribution, preferably using SAS? For example, I assume that frequency of persons born in...

    Started by manoa‎, 08-05-2011 08:48 PM
    • Replies: 2
    • Views: 1,935
    08-05-2011, 09:45 PM Go to last post
  10. Which test/model to use?

    Hello, I have a question regarding what methods/tests/models I can use to analyze my data. The data consists of different samples of teeth from...

    Started by mid06004‎, 08-06-2011 09:07 PM
    • Replies: 1
    • Views: 2,235
    08-06-2011, 09:20 PM Go to last post
  11. paired samples-equality of variance and 95% CI around difference

    Hi, Can a few of you please review the approach I plan to take for obvious errors? I have 50 subjects and each have a measure taken on the same...

    Started by seth‎, 08-02-2011 11:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,757
    08-06-2011, 10:29 PM Go to last post
  12. Markov Processes

    How to proof that in every markov process time between 2 arrivals is exponential ? best regards

    Started by endri81‎, 08-08-2011 12:49 AM
    • Replies: 0
    • Views: 1,620
    08-08-2011, 12:49 AM Go to last post
  13. Cool How do you account for under representation in your survey sample

    Overall, i have 10 groups in my sample. 2 groups are under represented. What is the best way to account for this under representation. Would...

    Started by hsaharmo‎, 08-06-2011 04:50 PM
    • Replies: 1
    • Views: 2,222
    08-08-2011, 03:18 AM Go to last post
  14. 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: 12,657
    08-08-2011, 04:38 AM Go to last post
  15. 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: 1,633
    08-08-2011, 11:38 AM Go to last post
  16. 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: 1,374
    08-09-2011, 12:07 AM Go to last post
  17. 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: 2,384
    08-09-2011, 08:23 AM Go to last post
  18. 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: 6,473
    08-09-2011, 10:54 AM Go to last post
  19. 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: 3,259
    08-09-2011, 01:57 PM Go to last post
  20. 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: 13,036
    08-09-2011, 02:58 PM Go to last post
  21. 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: 1,745
    08-10-2011, 04:52 PM Go to last post
  22. 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: 1,834
    08-11-2011, 11:32 AM Go to last post
  23. 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: 2,673
    08-11-2011, 02:21 PM Go to last post
  24. 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: 2,130
    08-11-2011, 03:35 PM Go to last post
  25. 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: 1,600
    08-11-2011, 09:51 PM Go to last post
  26. 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
  27. 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: 6,125
    08-15-2011, 08:06 PM Go to last post
  28. 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: 1,605
    08-17-2011, 07:17 AM Go to last post
  29. 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: 1,808
    08-17-2011, 10:32 AM Go to last post
  30. 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: 1,909
    08-17-2011, 10:22 PM Go to last post
  31. 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: 2,483
    08-19-2011, 04:44 PM Go to last post
  32. 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: 13,326
    08-20-2011, 01:22 AM Go to last post
  33. 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: 5,014
    08-20-2011, 04:15 PM Go to last post
  34. 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: 6,516
    08-21-2011, 05:46 PM Go to last post
  35. 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: 5,094
    08-23-2011, 07:58 PM Go to last post
  36. 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: 2,260
    08-24-2011, 01:33 PM 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: 2,419
    08-25-2011, 08:35 PM Go to last post
  38. 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: 5,722
    08-26-2011, 09:30 AM Go to last post
  39. 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: 4,900
    08-26-2011, 04:55 PM Go to last post
  40. 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: 2,587
    08-29-2011, 12:04 PM Go to last post
  41. 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: 7,550
    08-29-2011, 04:08 PM Go to last post
  42. 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: 2,316
    08-30-2011, 03:00 AM Go to last post
  43. 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: 2,159
    08-30-2011, 03:02 AM Go to last post
  44. 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: 5,554
    08-30-2011, 03:43 PM Go to last post
  45. 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: 4,711
    08-31-2011, 08:42 AM Go to last post
  46. 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: 3,905
    08-31-2011, 04:45 PM Go to last post
  47. 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: 2,430
    09-01-2011, 01:39 PM Go to last post
  48. 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: 8,899
    09-01-2011, 02:02 PM Go to last post
  49. 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: 1,550
    09-01-2011, 03:52 PM Go to last post
  50. 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: 3,487
    09-02-2011, 06:46 PM Go to last post
  51. 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: 2,432
    09-05-2011, 10:34 PM Go to last post
  52. 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: 2,686
    09-06-2011, 03:02 PM Go to last post
  53. 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: 3,749
    09-08-2011, 03:57 AM Go to last post
  54. 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: 5,164
    09-08-2011, 04:16 AM Go to last post
  55. 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: 4,022
    09-08-2011, 08:45 AM Go to last post
  56. 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: 5,183
    09-08-2011, 02:08 PM Go to last post
  57. 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: 1,506
    09-10-2011, 01:02 PM Go to last post
  58. 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: 5,102
    09-11-2011, 11:07 AM Go to last post
  59. 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: 2,068
    09-12-2011, 03:25 AM Go to last post
  60. 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: 1,708
    09-12-2011, 04:09 AM Go to last post

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