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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: 18,746
    10-11-2014, 12:02 PM Go to last post
  1. Do support vector machines automatically do variable selection ?

    Using the R command svm = svm(res~.,probability = T,type="nu-classification",data = train,cross=5) Does this "eliminate" variables so my svm...

    Started by lord12‎, 02-17-2013 08:59 PM
    • Replies: 0
    • Views: 1,603
    02-17-2013, 08:59 PM Go to last post
  2. Question Do the same minimum value requirements apply to chi-square for trend, as chi square?

    Hi, I'm doing a project about dilated kidneys, these can be arranged into mild, moderate and severe. There are 53 patients in total. I want to see...

    Started by nicole-v‎, 07-12-2015 11:05 AM
    chi square, chi square help what test, trend detection, trend test
    • Replies: 0
    • Views: 1,722
    07-12-2015, 11:05 AM Go to last post
  3. Do you know how you can solve this

    I want to plot a graph of the mean of two groups in the experiment. They have different mean, different standard deviation. The interval bars that...

    Started by h974483‎, 10-07-2011 05:22 PM
    • Replies: 0
    • Views: 1,796
    10-07-2011, 05:22 PM Go to last post
  4. Do you like this measure for status inconsistency?

    For my thesis I have a variable named 'status inconsistency', so I want to compare people whose income or profession doesnt allign with their...

    Started by Annvdb‎, 10-28-2014 12:35 AM
    spss, status inconsistency
    • Replies: 0
    • Views: 1,691
    10-28-2014, 12:35 AM Go to last post
  5. Do you need to satisfy assumptions in regression if you do 10-fold cross-validation?

    I wanted to get your opinion on this. When building models we want to make sure that the variables we have selected can be used in a model to predict...

    Started by micdhack‎, 12-23-2012 05:26 AM
    • Replies: 10
    • Views: 2,453
    12-29-2012, 06:48 AM Go to last post
  6. Do you need to standardise data before running MCA?

    I have both ordinal and categorical data and am attempting to perform a Multiple correspondence analysis. My question is if a dataset contains a...

    Started by Juliavv‎, 11-17-2015 03:28 AM
    mca, ordination, standardization
    • Replies: 1
    • Views: 1,291
    11-17-2015, 05:24 AM Go to last post
  7. doctoral research

    I would like help with posting and or and analylzing the results of mail surveys on collaboration onto SPSS.

    Started by gradstudent‎, 11-08-2008 10:56 PM
    • Replies: 3
    • Views: 2,582
    11-10-2008, 02:13 AM Go to last post
  8. DOE for Logistic Regression

    Hello- Does anyone have any references for DOE (especially multivariate testing / Taguchi) for binary response variables (analyzing with Logistic...

    Started by B_Miner‎, 08-28-2008 09:31 AM
    • Replies: 5
    • Views: 4,219
    08-28-2008, 11:18 AM Go to last post
  9. Does A Low Power In A Study Increase Type I Error Probability?

    Two statisticians in a forum (not here) are claiming that the probability of a Type I error increases when the study is small. They argue that a...

    Started by Musibrique‎, 11-09-2012 11:04 AM
    • Replies: 8
    • Views: 9,890
    11-13-2012, 01:22 PM Go to last post
  10. Does ANOVA tell which group is more /less than the other , or just they are different

    I was reading a peer reviewed paper titled: (Going hybrid: An analysis of consumer purchase motivations) where the authors used factor analysis...

    Started by Khalid‎, 09-20-2014 01:42 PM
    anova, factor analysis
    • Replies: 2
    • Views: 2,111
    09-21-2014, 09:31 AM Go to last post
  11. Does anybody have a calculus example for Bartlett and Levene tests?

    Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

    Started by quantster‎, 09-01-2010 02:54 PM
    • Replies: 14
    • Views: 6,445
    09-07-2010, 05:59 AM Go to last post
  12. Does anyone know what associated means??

    I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

    Started by wwreith‎, 08-06-2010 09:14 AM
    • Replies: 1
    • Views: 3,020
    08-06-2010, 10:55 AM Go to last post
  13. Does autocorrelation in data affect (simple) correlation measures?

    Hello everyone, I have a question concerning autocorrelation in data affecting correlation coefficients. I have a time series of stock returns...

    Started by samf‎, 06-04-2015 10:35 AM
    • Replies: 0
    • Views: 882
    06-04-2015, 10:35 AM Go to last post
  14. Does covariate must be observed variable?

    In my study, I found significant interactions between treatment and order of sessions. Can I put the order variable as covariate in order to control...

    Started by PsychologyS‎, 07-03-2017 04:34 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 1,382
    07-06-2017, 07:07 PM Go to last post
  15. Does frequency distribution matter when using nominal/ordinal data?

    I want to do relationship analysis between different variables from questionnaire results that I've just collected and I've recently learned that you...

    Started by slamer2000‎, 05-07-2017 01:17 PM
    frequency distribution, nominal data, normal distribution, ordinal data
    • Replies: 1
    • Views: 1,162
    05-07-2017, 05:41 PM Go to last post
  16. does it make sense to square log(x)?

    log(x) and 2log(x) in the model, log(x) is authomatically getting dropped from the model because of collinearity. Is it ok, or do I need to keep the...

    Started by SylviaS‎, 05-26-2012 09:39 AM
    • Replies: 0
    • Views: 1,155
    05-26-2012, 09:39 AM Go to last post
  17. Does my research proposal make sense? [Basic Stats]

    Hi everyone, I'm new to statistics, statistical packages and research methods in general. Yet I'm fascinated by the subject and want to learn as...

    Started by StatsScared‎, 08-06-2013 04:01 PM
    basic statistics, help me!, time-use, two-way anova
    • Replies: 2
    • Views: 2,842
    08-06-2013, 04:46 PM Go to last post
  18. does the following interaction make sense?

    Hello, I have a problem, it would be great if someone could help me with it. I m analyzing a sample of patients with eating disorders (anorexia ,...

    Started by hazel‎, 06-21-2012 01:12 AM
    • Replies: 0
    • Views: 1,356
    06-21-2012, 01:12 AM Go to last post
  19. Does the NSA random number generator backdoor affect statistical random nummbers?

    Hello, in my computer magazine I read 1 month ago, that the NSA has inserted a backdoor in the random number generating circuit on Intel...

    Started by consuli1‎, 01-17-2014 01:29 PM
    art bell, coast to coast
    • Replies: 1
    • Views: 2,106
    01-17-2014, 06:29 PM Go to last post
  20. Does the sequential Bonferroni correction method apply to my data?

    The literature on Bonferroni correction methods is confusing me... I have compared means of multiple variables (some dependent, some independent)...

    Started by bearica5‎, 01-07-2014 03:37 PM
    bonferroni, bonferroni correction
    • Replies: 1
    • Views: 2,384
    01-07-2014, 04:56 PM Go to last post
  21. Don't know where to start, please help

    :eek: Please any kind person help, as I am horribly stuck!!! I have a *very* large dataset (n>300,000 rows) of water readings in this format; ...

    Started by heather_s‎, 03-23-2010 12:30 AM
    • Replies: 2
    • Views: 2,220
    03-23-2010, 10:43 PM Go to last post
  22. Doubts analyzing Likert scales

    Hi all, I thought about analyzing results from Likert scale using Kruskal-Wallis, but the more I read about it, the more confused I get. People...

    Started by mprksc‎, 07-10-2012 01:41 PM
    • Replies: 3
    • Views: 4,536
    07-12-2012, 09:01 PM Go to last post
  23. Dropping observation

    Hello I am too embarrassed to ask it as it looks very easy but I did not find answers to it and I tried hard. I have a sample of 5000...

    Started by yaelcohen‎, 10-26-2015 01:39 AM
    • Replies: 1
    • Views: 2,033
    10-26-2015, 07:47 PM Go to last post
  24. Dummies in a correlation matrix

    Hi everyone, I am working on a multiple moderate regression. And just wanted to add the correlation matrix as well. Now I got the responds that...

    Started by Jul!a‎, 02-27-2014 11:12 AM
    correlation matrix, dummy variables
    • Replies: 4
    • Views: 2,123
    02-27-2014, 12:07 PM Go to last post
  25. dummy*continous interaction- sig. main effect, non-significant interaction

    Hi all, I would be grateful if someone could give me advice on the following topic: I estimated a glm and formed an interaction term out of a...

    Started by hazel‎, 06-28-2012 05:33 PM
    • Replies: 0
    • Views: 1,845
    06-28-2012, 05:33 PM Go to last post
  26. Durbin-Watson statistics - autocorrelation

    If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

    Started by eunkum‎, 03-21-2013 10:25 AM
    • Replies: 4
    • Views: 3,511
    03-21-2013, 04:01 PM Go to last post
  27. Durbin-Watson upper critical value is higher than 2, what now?

    Hi! I have a home assignment in econometrics. I work with Gretl, on the Ramanathan data9-10 datafile. I have done an OLS model with all the input...

    Started by Máté‎, 12-25-2013 12:18 PM
    • Replies: 0
    • Views: 1,441
    12-25-2013, 12:18 PM Go to last post
  28. Easy Standardization Question

    Hello everyone, I have a hopefully solveable question, however, I would like to get your opinion on it, as I am not 100% sure. I have a dataset...

    Started by Absolutlyclueless‎, 05-30-2012 04:15 AM
    • Replies: 0
    • Views: 1,328
    05-30-2012, 04:15 AM Go to last post
  29. Ecological Data advice on which test

    I have done an experiment and am in dire need of some advice on statistical methods that I should use to answer the questions I seek. The...

    Started by shift_540‎, 04-28-2013 07:40 PM
    ecological statistics
    • Replies: 0
    • Views: 1,004
    04-28-2013, 07:40 PM Go to last post
  30. Ecological statistics - comparison across three years

    Hello all, I have a rather large data set to analyze, and I would appreciate some guidance. For this dataset, 80 plots were sampled for dead tree...

    Started by Mu10‎, 06-03-2013 06:29 PM
    • Replies: 4
    • Views: 1,796
    06-08-2013, 04:38 PM Go to last post
  31. Effect of Culture on Scales

    I am considering implementing a study asking respondents to rate several items on 1-10 scale. In America, I know the limitations of the scale. ...

    Started by mpongras‎, 12-01-2008 10:57 AM
    • Replies: 0
    • Views: 2,155
    12-01-2008, 10:57 AM Go to last post
  32. Effect size and Significance

    I want to use Students' Treatment Total Score and Control Group Total Score, and measure 'difference between the scores'. And then I want to measure...

    Started by eunkum‎, 11-12-2012 05:49 PM
    • Replies: 0
    • Views: 1,067
    11-12-2012, 05:49 PM Go to last post
  33. Effect size for small non-parametric data

    Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

    Started by fabinha‎, 06-23-2014 09:13 PM
    • Replies: 5
    • Views: 3,153
    06-30-2014, 06:25 PM Go to last post
  34. Effect size measures comparability

    Hi everyone, I registered just now, because I have been struggling with a question I have not been able to answer (and one of my fellow graduate...

    Started by hanzifranz‎, 04-13-2013 02:13 PM
    • Replies: 0
    • Views: 1,770
    04-13-2013, 02:13 PM Go to last post
  35. Effect-size Two-way ANOVA repeated measures

    Dear statistical experts, I am getting confused on how to compute effect size in two-way ANOVA with repeated measures. - Should I use Cohen d...

    Started by tkdn‎, 09-30-2015 06:14 AM
    • Replies: 0
    • Views: 1,926
    09-30-2015, 06:14 AM Go to last post
  36. Eigenvector for large matrices

    Well, this is kind of a linear algebra question, but is used very often in statistics, so it seems applicable for this forum. My question is, does...

    Started by senorbum‎, 06-30-2008 09:01 AM
    • Replies: 11
    • Views: 7,047
    07-01-2008, 01:58 PM Go to last post
  37. EM algorithm

    Hello can you help me? I require a program for estimate of parameters in density of mixture exponential With EM algorithm . Thank you for your...

    Started by elnaz‎, 04-09-2006 03:44 PM
    • Replies: 0
    • Views: 3,589
    04-09-2006, 03:44 PM Go to last post
  38. 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: 2,912
    03-28-2011, 07:40 PM Go to last post
  39. EM algorithm - estimation

    Hi. I try to implement EM algorithm for multivariate missing values, but i have problem with estimating function. Suppose µ is mean vector, Σ is...

    Started by kaczan‎, 04-17-2011 11:20 AM
    • Replies: 0
    • Views: 2,407
    04-17-2011, 11:20 AM Go to last post
  40. EM Algorithm for Gaussian Mixture model fitting data with missing values

    I have an EM function that will take regular data with no missing values, and compute means, standard deviations, and probabilities of components of...

    Started by zzzc‎, 03-31-2011 09:15 PM
    • Replies: 1
    • Views: 4,385
    04-12-2011, 11:26 AM Go to last post
  41. Empirical QQ-plots for binomial GAM?

    Hello everybody I've nearly finished my first binomial GAM analysis (presence absence data). I've been looking for ways to validate my models....

    Started by miriamb‎, 01-28-2013 03:45 AM
    • Replies: 0
    • Views: 1,867
    01-28-2013, 03:45 AM Go to last post
  42. Employee survey: how to make it more representative?

    Gentlemen, I am creating a survey to monitor employee satisfaction with their employers. I am designing a survey which contains questions...

    Started by Biersma‎, 07-26-2012 08:20 AM
    • Replies: 1
    • Views: 2,034
    07-26-2012, 10:12 AM Go to last post
  43. Enrichment / over-representation of pairs, triplets, quadruples, etc.

    Due to a lack of interest from users for over a month I would like to delete this thread.

    Started by Adam Przedniczek‎, 12-19-2015 04:01 PM
    enrichment, over-representation
    • Replies: 0
    • Views: 885
    12-19-2015, 04:01 PM Go to last post
  44. equal/unequal sample sizes

    I have recently sent a paper on aflatoxin levels in nuts for publishing. The aim of the study was to analyze a total amount of 106 nuts. The nuts...

    Started by ivn‎, 02-09-2015 02:17 PM
    • Replies: 3
    • Views: 2,155
    02-09-2015, 03:20 PM Go to last post
  45. 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: 6,479
    08-09-2011, 10:54 AM Go to last post
  46. Error Analysis with Binned Data

    Our income data comes in increments of $5,000 from $15,000 onward. The [$0 to $15,000) is one way too big of a bin. In any case, we also have...

    Started by bryangoodrich‎, 12-07-2012 01:26 AM
    • Replies: 0
    • Views: 1,537
    12-07-2012, 01:26 AM Go to last post
  47. error on percentile estimation

    Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

    Started by Jack Carter‎, 08-17-2010 03:54 AM
    • Replies: 2
    • Views: 6,545
    08-17-2010, 06:01 AM Go to last post
  48. error propagation

    I have a point estimate of quantity 'A' and an associated standard error. If I calculate a new quantity (= ln-transformed 'A' multiplied by a...

    Started by JFS‎, 10-15-2014 01:09 PM
    log transformation, standard error
    • Replies: 0
    • Views: 1,844
    10-15-2014, 01:09 PM Go to last post
  49. Error propagation in integral with limits uncertainties

    Hallo, I have one concern that I think the community can help. I need to calculate the definite integral where the limits have their errors as...

    Started by jasq‎, 06-21-2013 08:06 AM
    • Replies: 2
    • Views: 5,545
    06-23-2013, 03:16 AM Go to last post
  50. Error with Skillings-Mack test in R

    I was trying to perform a Skillings-Mack test in R and can only get error message saying "Error in split.default(x = seq_len(nrow(x)), f = f, drop =...

    Started by skylandyu‎, 07-13-2015 12:12 PM
    • Replies: 0
    • Views: 2,552
    07-13-2015, 12:12 PM Go to last post
  51. estimate a range of measures

    Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

    Started by andrew_fg‎, 03-12-2016 05:41 AM
    biostatistics, estimate, measurement
    • Replies: 0
    • Views: 998
    03-12-2016, 05:41 AM Go to last post
  52. Estimated Parameter as Dependent Variable

    Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

    Started by Maya_L‎, 12-01-2016 02:06 PM
    bootstraping, error term, estimated parameter
    • Replies: 2
    • Views: 3,101
    12-01-2016, 02:37 PM Go to last post
  53. estimated variable as dependent variable get robust standard errors

    Hi, I have a problem with the calculation of standard errors when using a dependent variable in a regression model that was previously estimated...

    Started by silcol‎, 02-20-2014 11:53 AM
    • Replies: 0
    • Views: 2,166
    02-20-2014, 11:53 AM Go to last post
  54. Estimating a confidence interval for a pooled sample using only descriptive stats

    Hi there Sorry for the vague title; I suspect my query is a simple one but I'm not quite sure how to phrase it. I have data on a number of...

    Started by sirbuttzalot‎, 10-08-2013 07:03 PM
    • Replies: 0
    • Views: 1,604
    10-08-2013, 07:03 PM Go to last post
  55. Estimating a pdf from binomial trials - point me in the right direction?

    Hi, I'm afraid I'm not an expert in statistics, but I have a particular problem I'm interested in solving. I'm pretty sure this area already has a...

    Started by Stereotomy‎, 04-23-2012 08:24 PM
    bernoulli, binomial, estimation, inference, parameterless
    • Replies: 3
    • Views: 1,475
    04-27-2012, 12:34 PM Go to last post
  56. Red face Estimating a term

    I have observations on t_i, where t_i = a_i + b_i. a_i = \mu + e_i, where \mu is constant and e_i is the usual error term with mean 0. I also know...

    Started by jessica01‎, 06-13-2011 02:52 PM
    • Replies: 5
    • Views: 1,916
    06-13-2011, 03:37 PM Go to last post
  57. Estimating initial level after the treatment!

    Hi, Say I wanted to examine the effect of some treatment on a hormone level but I could not measure the pre-treatment level. Example, person runs...

    Started by PeterVincent‎, 10-09-2009 09:29 AM
    • Replies: 3
    • Views: 2,639
    10-09-2009, 11:46 AM Go to last post
  58. Estimating likelihood of normal distribution mean shift after N samples

    First off, sorry if this post is in the wrong place. Please feel free to point me to the right place to post. The scenario is as follows: I have...

    Started by aut0pilot101‎, 06-11-2013 10:12 PM
    • Replies: 6
    • Views: 2,462
    06-12-2013, 10:39 AM Go to last post
  59. Estimating location of lower tail

    Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

    Started by EdddieB1985‎, 03-31-2016 12:40 AM
    confidence interval, estimation, standard error
    • Replies: 2
    • Views: 1,641
    03-31-2016, 11:58 AM Go to last post
  60. Estimating overall output of multiple independent inputs - engineering project

    Hi all I am conducting a final-year university engineering research project. The aim is to build a model (in the form of single implicit...

    Started by gidon‎, 09-27-2011 07:25 AM
    • Replies: 0
    • Views: 1,355
    09-27-2011, 07:25 AM Go to last post

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