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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. Questions about approach

    Hi, I am working with a large data set with all categorical variables except for age, which I will want to group in to age bands. I think I am...

    Started by Byrnethau‎, 03-29-2011 01:45 PM
    different chisq tests
    • Replies: 2
    • Views: 2,337
    03-29-2011, 09:23 PM Go to last post
  2. interval censored data using bootstrap method

    I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

    Started by zzzc‎, 03-16-2011 08:35 PM
    • Replies: 2
    • Views: 4,854
    03-29-2011, 09:09 PM Go to last post
  3. Lightbulb What type of analysis??

    The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

    Started by ayo jay jo‎, 03-29-2011 10:53 AM
    • Replies: 1
    • Views: 2,077
    03-29-2011, 07:11 PM Go to last post
  4. Choosing Statistical Tests for a Study

    I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

    Started by mariejolene‎, 03-22-2011 12:09 AM
    • Replies: 8
    • Views: 5,271
    03-28-2011, 11:41 PM Go to last post
  5. ?is there a test for this?

    I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

    Started by Justin Gundara‎, 03-24-2011 07:35 AM
    • Replies: 2
    • Views: 2,107
    03-28-2011, 08:45 PM Go to last post
  6. EM Algorithm

    Hi All, I am trying to implement the EM algorithm for a 3 population exponential distribution. I am having the following issues. 1. If l1_true=;9...

    Started by raghustats‎, 03-20-2011 12:27 PM
    • Replies: 1
    • Views: 2,914
    03-28-2011, 07:40 PM Go to last post
  7. Survival Analysis with non 0 start time

    I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

    Started by johank‎, 03-28-2011 05:04 PM
    • Replies: 2
    • Views: 4,420
    03-28-2011, 07:11 PM Go to last post
  8. Question What is the technique of analyzing pooled cross sectional data?

    Like the title suggests, I have a data set that comprise of several cross sectional waves. The subjects in each wave are different, just to be clear....

    Started by non-sleeper‎, 03-28-2011 02:15 AM
    • Replies: 0
    • Views: 3,580
    03-28-2011, 02:15 AM Go to last post
  9. Please help me with this question

    A company is interested in investing in companies in Hong Kong. They have access to large dataset on the rate of return on assets (expressed in...

    Started by danswe3‎, 03-27-2011 12:46 PM
    • Replies: 1
    • Views: 2,224
    03-27-2011, 01:14 PM Go to last post
  10. Need some help choosing correct statistical method for study

    Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

    Started by rwws22‎, 03-26-2011 10:09 PM
    • Replies: 2
    • Views: 4,675
    03-27-2011, 02:56 AM Go to last post
  11. Is Levene's transformation with ANOVA equivalent to Levene's W?

    Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

    Started by amesshaps‎, 03-25-2011 09:36 PM
    anova, levene's test
    • Replies: 0
    • Views: 5,398
    03-25-2011, 09:36 PM Go to last post
  12. Sigma within an averaged group

    I am trying to assess variation in a process in which the sample is too small to measure individually. To get a rough idea of the variation, I have...

    Started by scolbert‎, 03-25-2011 09:28 PM
    • Replies: 0
    • Views: 1,882
    03-25-2011, 09:28 PM Go to last post
  13. How to test the P-value in this type of situation

    Hi all, this is my first post on the forum... I apologize in advance, this explanation might be a little long...please let me know if anything is...

    Started by joeyb313‎, 03-25-2011 03:42 PM
    • Replies: 2
    • Views: 2,393
    03-25-2011, 04:42 PM Go to last post
  14. Difference needed for power in fixed population.

    Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a...

    Started by schisms‎, 03-23-2011 05:38 AM
    power, significance
    • Replies: 7
    • Views: 3,394
    03-25-2011, 12:34 PM Go to last post
  15. nonparametric estimate the distribution with a histogram only

    Suppose X1,.., Xn ~iid F with mean mu_F The data is summarized in a histogram and that is all I have. I don't have the individual Xi (i = 1,...,n)....

    Started by zzzc‎, 03-23-2011 11:32 PM
    • Replies: 3
    • Views: 3,091
    03-24-2011, 11:47 PM Go to last post
  16. Mixed Model Covariance Structure

    I have a study with a somewhat unique experimental design which I would like to used Mixed Modeling to analyze. All subjects in the study were...

    Started by jmike‎, 03-24-2011 08:28 PM
    covariance, mixed methods, mixed models
    • Replies: 0
    • Views: 3,062
    03-24-2011, 08:28 PM Go to last post
  17. Clustering Analysis when to stop the algorithm?

    I have a data set, let's assume 1,000 points, that I am attempting to form into clusters. I am using Hierarchical clustering in the sense that I...

    Started by wwreith‎, 03-24-2011 08:29 AM
    clustering, variance
    • Replies: 0
    • Views: 1,906
    03-24-2011, 08:29 AM Go to last post
  18. Missing values with Row and Column Totals

    Hello everyone, I'm working with government panel data (yearly data of manufacturing industry (row) by continent (column)) that has a lot (about...

    Started by zlatank‎, 03-23-2011 12:41 PM
    algorithm, data, imputation, missing values, sudoku
    • Replies: 0
    • Views: 1,926
    03-23-2011, 12:41 PM Go to last post
  19. Please give me feedback on my study proposal!

    Greetings, I work for a small software company, and we will be performing a statistical experiment on the effectiveness of a mobile learning...

    Started by FreddyZ‎, 03-22-2011 04:08 PM
    • Replies: 2
    • Views: 4,295
    03-23-2011, 11:20 AM Go to last post
  20. Stats consulting assignment- need help!

    Hello! I'm working on a short stats assignment (4 pgs including graphs and appendices) and while I have the basics down (representative, variance,...

    Started by pretti.pear‎, 03-20-2011 06:38 PM
    • Replies: 1
    • Views: 2,053
    03-22-2011, 08:26 AM Go to last post
  21. 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...

    Started by DanaSchneiderDJS‎, 03-18-2011 09:29 PM
    • Replies: 6
    • Views: 7,037
    03-21-2011, 01:34 AM Go to last post
  22. Help with dissertation

    Hello everyone. I need someone to make up a table for me for my dissertation. I've got the answers to it but can't figure out how the table can be...

    Started by Vicks‎, 03-19-2011 09:55 AM
    • Replies: 1
    • Views: 2,738
    03-19-2011, 09:58 AM Go to last post
  23. Catching a growth trend variable for 5 yearly sales number

    Hey everyone, I'm doing research in international business. I will skip the details and get to my basic problem directly. I have 300 firms in...

    Started by raulz‎, 03-19-2011 07:39 AM
    • Replies: 0
    • Views: 2,614
    03-19-2011, 07:39 AM Go to last post
  24. xtDPDsys postestimation

    Hi all I run two equations using xtdpdsys, the postestmation came as follows First equation estat sargan Sargan test of overidentifying...

    Started by momo‎, 03-19-2011 05:37 AM
    • Replies: 0
    • Views: 4,826
    03-19-2011, 05:37 AM Go to last post
  25. SEM - indirect effects

    Hi all, Software for SEM (Amos, Lisrel) provides estimates for indirect effects, and small size coefficients are often found to be statistically...

    Started by luic‎, 03-18-2011 02:46 AM
    • Replies: 1
    • Views: 8,624
    03-18-2011, 03:41 AM Go to last post
  26. Bootstrapping Dependent Data

    Is there any bootstrapping procedure for dependent data which is not based on any specific model?

    Started by tsukiko‎, 03-16-2011 07:49 PM
    • Replies: 2
    • Views: 2,185
    03-16-2011, 10:03 PM Go to last post
  27. Statistics for data analysis

    I'm currently writing up a research practical report for a study I did as part of my degree. I've become a little stumped when it comes to the theory...

    Started by Lemon‎, 03-11-2011 08:36 AM
    • Replies: 4
    • Views: 2,873
    03-16-2011, 07:21 PM Go to last post
  28. Non normal distributed Statistical Test

    I am doing Statistical test between independent variable vs dependent variable Independent : Numeric Data - eg: Age (5,6,78,19) Dependent :...

    Started by studentdoctor‎, 03-16-2011 09:56 AM
    • Replies: 1
    • Views: 3,439
    03-16-2011, 10:54 AM Go to last post
  29. This may be extraordinarily easy

    I don't know which is why I am asking here on this forum. We are in the middle of a debate and I have absolutely no idea whatsoever of what the...

    Started by Blitzburgh‎, 03-14-2011 04:41 PM
    • Replies: 1
    • Views: 2,345
    03-14-2011, 06:19 PM Go to last post
  30. Comparing within groups and across conditions

    Hi, I am not sure if anyone can help me, i have undertaken a large physiological study for my post grad, it is looking at stress hormones within...

    Started by sifry37‎, 03-14-2011 05:35 PM
    • Replies: 0
    • Views: 3,257
    03-14-2011, 05:35 PM Go to last post
  31. Tests for nonnested models (Vuong, Clarke)

    When comparing generalized linear models, do the Vuong and Clarke tests require that the response distributions be the same? For example, could I...

    Started by CappyD‎, 03-12-2011 01:41 PM
    clarke, non-nested, nonnested, vuong
    • Replies: 0
    • Views: 3,719
    03-12-2011, 01:41 PM Go to last post
  32. Two-step PPS stratified sample: how to choose additional respondents?

    Hello, I find nothing in the literature on how to deal with this, so here goes. We have a relatively complex sample, and we need to acquire...

    Started by autarkie‎, 03-11-2011 03:46 AM
    • Replies: 0
    • Views: 4,315
    03-11-2011, 03:46 AM Go to last post
  33. chi-square assumptions with survey data

    Hi guys, I've been asked to run some analyses on some survey data and since it's been a long time since i ran one, I just wanted to check I'm not...

    Started by Elysse‎, 03-09-2011 07:56 PM
    assumptions, chi-squared, survey
    • Replies: 1
    • Views: 2,878
    03-10-2011, 02:10 AM Go to last post
  34. power of Krusal-wallis test when normality doesn hold

    pvalue = rep(NA, 1000) # repeat 1000 times pvaluekw = rep(NA, 1000) n = rep(25, 3) group = rep(1:3, n) for (i in 1:1000){ x1 <- rt(25,df=3)...

    Started by xixihaha‎, 03-07-2011 08:36 AM
    • Replies: 1
    • Views: 3,410
    03-07-2011, 10:32 AM Go to last post
  35. Significance testing for proportions (NPS)

    I have 2009 and 2010 NPS (Net Promoter Score) survey results. Now I want to test if the change in 2010 NPS from 2009 is statistically significant or...

    Started by Kevin_ind‎, 03-01-2011 02:26 AM
    • Replies: 2
    • Views: 7,754
    03-07-2011, 05:17 AM Go to last post
  36. 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: 3,369
    03-07-2011, 02:59 AM Go to last post
  37. Analysis of Categorical Data

    Hello friends, I'am doing intermediate statistics for second year and I'am having some issues with this chapter. My professor told...

    Started by Bajic‎, 03-06-2011 04:44 PM
    • Replies: 0
    • Views: 3,233
    03-06-2011, 04:44 PM Go to last post
  38. Testing for a change in mean in a time series

    Suppose I have m observations from a time series before some specified date, and n additional observations after that date. The mean of the time...

    Started by Buchuck‎, 03-05-2011 12:41 AM
    • Replies: 1
    • Views: 5,040
    03-05-2011, 09:35 AM Go to last post
  39. t-tests after three-way ANOVA?

    Hi all, I've just run a three-way ANOVA on my data (3 IVs, 1 DV). I've got some main effects, as well as a three-way interaction effect. Am I...

    Started by psychi‎, 03-01-2011 05:29 AM
    anova, t-test, three-way anova
    • Replies: 3
    • Views: 5,889
    03-04-2011, 05:20 PM Go to last post
  40. 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...

    Started by lk145‎, 02-16-2011 12:34 AM
    • Replies: 5
    • Views: 45,734
    03-03-2011, 09:11 PM Go to last post
  41. which statistical test to use in spss

    I have a variable (dependent) and five independent variables. How can I test if the five variables affect the dependent variable? Which test should...

    Started by hahahihihuhu‎, 03-02-2011 12:38 PM
    • Replies: 1
    • Views: 5,849
    03-03-2011, 08:56 PM Go to last post
  42. Common method variance

    Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

    Started by john_cappa‎, 03-01-2011 10:43 AM
    • Replies: 2
    • Views: 3,828
    03-03-2011, 08:52 PM Go to last post
  43. Office for National Statistics YouTube channel

    The Office for National Statistics has recently launched a new YouTube channel explaining some of the stories about their statistics. Its a new...

    Started by Jamie Jenkins‎, 03-03-2011 05:31 PM
    • Replies: 0
    • Views: 3,777
    03-03-2011, 05:31 PM Go to last post
  44. Bootstrap for estimating parameters...

    Hi. Let say we have only one original sample in which we are interested only on one statistics c of this sample, e.g. median. And let say we want...

    Started by tsukiko‎, 03-01-2011 11:03 PM
    • Replies: 0
    • Views: 1,729
    03-01-2011, 11:03 PM Go to last post
  45. 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: 3,308
    02-28-2011, 12:51 PM Go to last post
  46. Correlation or Difference?

    hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

    Started by micdhack‎, 02-26-2011 08:03 AM
    • Replies: 2
    • Views: 5,629
    02-26-2011, 11:41 AM Go to last post
  47. linear mixed model in SPSS - how?

    Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

    Started by BBD‎, 02-02-2011 11:58 AM
    • Replies: 2
    • Views: 18,822
    02-25-2011, 02:56 PM Go to last post
  48. Prerequisite for gene regulatory network research (systems biology)

    I would appreciate any advice or directions on what to study and in what order, from basic statistics and probability course to were one is able to...

    Started by anog‎, 02-24-2011 03:46 PM
    biology, cell, model selection, system biology, systems
    • Replies: 0
    • Views: 2,921
    02-24-2011, 03:46 PM Go to last post
  49. Pharmacology Exp Help

    Hello. I have been volunteering at a lab and need help with Behavioral Analysis. My data points are activity (locomotion) "counts" of 10 min...

    Started by slammer922‎, 02-10-2011 12:44 PM
    • Replies: 5
    • Views: 2,601
    02-24-2011, 10:52 AM Go to last post
  50. Best Approach

    Hi, I am looking to analyse a data set consisting of one dependent variable - respondent satisfaction values ranging from 1 to 10 - with three...

    Started by cockett7‎, 02-22-2011 06:42 PM
    • Replies: 2
    • Views: 2,447
    02-23-2011, 11:38 AM Go to last post
  51. Hypothesis testing for comparing single channels of states in multivariate HMM

    In brief: I have a multivariate observational output with low covariances, each dimension of which can be considered the result of a distinct hidden...

    Started by hythlodaeus‎, 02-14-2011 02:21 PM
    hidden markov models, hypothesis testing
    • Replies: 1
    • Views: 2,494
    02-23-2011, 03:34 AM Go to last post
  52. Please help: Need a method to compare rankings over different circuits

    Hello, I do not have a background in statistics. I need help finding a methodology to compare the performance of a given set of items under...

    Started by doubidou‎, 02-22-2011 05:07 PM
    • Replies: 0
    • Views: 2,147
    02-22-2011, 05:07 PM Go to last post
  53. paper about different robust approach

    I can not find any paper about, robust statistics where they are looking to outliers not like a outlierts but like that model miss specification. ...

    Started by Peterko‎, 02-22-2011 01:03 PM
    • Replies: 0
    • Views: 1,754
    02-22-2011, 01:03 PM Go to last post
  54. Fisher LDA

    Hi, How do I incorporate knowledge of prior class probabilities p_i into Fisher LDA? I think Fisher LDA assumes p_i = 1/c always, with c=# of...

    Started by omrit‎, 02-22-2011 08:54 AM
    • Replies: 2
    • Views: 4,154
    02-22-2011, 11:39 AM Go to last post
  55. What is the correct statistical test for the Root Mean Squared error?

    Thank you an answer to this question is no longer required. I'm not able to delete this though!

    Started by SiBorg‎, 02-22-2011 04:37 AM
    • Replies: 0
    • Views: 2,319
    02-22-2011, 04:37 AM Go to last post
  56. Question MLE for given mean

    The observed value of mean of a random sample from N(\theta,1) distribution is 2.3. If the parameter space is \Theta=\{0,1,2,3\}, what is the MLE of...

    Started by Sambit‎, 02-21-2011 10:09 AM
    • Replies: 2
    • Views: 2,227
    02-21-2011, 10:59 AM Go to last post
  57. population normally distributed, sample not, parametric test allowesd?

    Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

    Started by BBD‎, 12-08-2010 09:19 AM
    • Replies: 8
    • Views: 18,214
    02-19-2011, 07:26 PM Go to last post
  58. Unhappy Determining a new variance

    I am trying to understand a property of ML Estimates, that their distribution is asymptotically normal with covariance matrix inverse of Fisher's...

    Started by justin.sharber‎, 02-19-2011 12:13 AM
    • Replies: 1
    • Views: 2,514
    02-19-2011, 04:30 PM Go to last post
  59. RCBD Subsampling or Not?

    I am currently working on a project looking to compare seedling height growth between two different years. The project is set up like this: There...

    Started by jmc6242‎, 02-18-2011 04:23 PM
    • Replies: 0
    • Views: 2,013
    02-18-2011, 04:23 PM Go to last post
  60. Kolmogorov-Smirnov to Lattice Path mapping

    I often see the claim that the null distribution of Kolmogorov's D+ statistic maps onto a lattice path problem that requires computing the number of...

    Started by ichbin‎, 02-17-2011 05:11 PM
    • Replies: 0
    • Views: 2,405
    02-17-2011, 05:11 PM Go to last post

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