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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: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. Critiques Requested on Resampling as an Approach

    I found an old piece code I wrote. I had a logistic model with a multiplicative interaction term consisting of two binary variables plus model...

    Started by hlsmith‎, 10-22-2015 09:50 AM
    • Replies: 6
    • Views: 1,751
    10-22-2015, 03:23 PM Go to last post
  2. cronbach alpha for missing data

    Hi, I have an indicator which consists of questions 24, 25, 27, 29, 30, 31, and 32. I am in the middle of determining internal consistency and...

    Started by proc1125‎, 10-07-2014 06:25 PM
    • Replies: 0
    • Views: 2,452
    10-07-2014, 06:25 PM Go to last post
  3. Cronbach's alpha

    Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

    Started by ljsimkcd‎, 10-12-2011 08:10 AM
    • Replies: 5
    • Views: 3,635
    10-14-2011, 05:01 AM Go to last post
  4. Cronbach's alpha and Cohen's Kappa (CA & CK)

    Is there any effective difference between CA and a weighted-CK? Anyone any thoughts?

    Started by Philyuko‎, 02-04-2009 09:32 AM
    • Replies: 2
    • Views: 10,584
    11-15-2015, 04:32 PM Go to last post
  5. Cronbach's Alpha if items are not exposed equally..

    Can Cronbach's Alpha be calculated for a survey in which number of questions are not equally exposed to users? Say, I have 40 questions in a test,...

    Started by nidzie_07‎, 10-21-2013 04:59 AM
    • Replies: 1
    • Views: 1,276
    10-21-2013, 08:06 AM Go to last post
  6. Cronbach's alpha with weighted data

    Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

    Started by jimbowylie‎, 09-29-2011 06:03 AM
    cronbach's alpha, research, weighted data
    • Replies: 0
    • Views: 2,840
    09-29-2011, 06:03 AM Go to last post
  7. Question Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

    Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

    Started by Eaners‎, 01-27-2015 10:22 PM
    cronbach's alpha, likert scale analysis, pretest
    • Replies: 6
    • Views: 1,548
    01-28-2015, 02:46 PM Go to last post
  8. Cross sectional T-test, event-study

    Hello, I'm new to the forum and I have tried searching for it but couldn't quite find my solution. I'm working on a paper involving an Event study...

    Started by Menthol‎, 01-27-2014 07:09 PM
    • Replies: 0
    • Views: 4,876
    01-27-2014, 07:09 PM Go to last post
  9. Question Cross-estimating the independent variables to exclude outliers

    I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

    Started by erikstatman‎, 03-08-2014 08:49 AM
    modeling, outlier, regresion
    • Replies: 0
    • Views: 5,599
    03-08-2014, 08:49 AM Go to last post
  10. cross-tabs or non-parametric independent sample t-test

    I have conducted a survey to determine if there is a significant difference in the number farmers and non-farmers which agree to a specific farming...

    Started by MayTrix‎, 07-23-2015 10:04 AM
    cross tabulation, non parametric
    • Replies: 7
    • Views: 1,898
    08-17-2015, 01:32 PM Go to last post
  11. 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: 2,370
    08-09-2011, 08:23 AM Go to last post
  12. Question Crossover design or Randomised Block Design?

    I have two groups of rats (group A and group B). 'Pretreated' means they were injected beforehand (with either memantine or saline). They were then...

    Started by gunwind‎, 12-20-2013 12:44 PM
    • Replies: 2
    • Views: 1,470
    12-22-2013, 07:15 PM Go to last post
  13. crosstabs -

    I have a crosstabs with two categorical variables. 6 columns x 4 rows. Data are proportions, not means. Basic chi-square shows me that the...

    Started by msafns‎, 04-05-2011 03:52 PM
    • Replies: 0
    • Views: 3,195
    04-05-2011, 03:52 PM Go to last post
  14. Cumulative heat units - what is a valid way of determining difference between sites

    Background: I work for a blueberry grower. The accumulation of heat units is important in understanding and predicting the development of the plant...

    Started by Dan@nzg‎, 07-20-2014 09:23 PM
    • Replies: 0
    • Views: 2,216
    07-20-2014, 09:23 PM Go to last post
  15. Cumulative Periodogram

    Hello, As part of my master's research, I am exploring a cyclic pattern in daily climate data (latent heat flux). To explore this pattern, I...

    Started by hpants24‎, 12-07-2010 10:40 PM
    • Replies: 1
    • Views: 5,163
    10-20-2013, 11:17 PM Go to last post
  16. Current Commentary Study

    Hi what is it a Current commentary study ??? What does it mean ??? Regards

    Started by viwel‎, 04-28-2009 07:05 AM
    • Replies: 2
    • Views: 2,853
    04-30-2009, 07:52 AM Go to last post
  17. Curve parameters

    Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

    Started by nrstein1‎, 02-02-2012 03:15 PM
    • Replies: 8
    • Views: 2,738
    03-13-2012, 03:10 PM Go to last post
  18. Customer problems vs R&D efficiency -> Statistic needed

    Hi guys, I have one case for which I need to find out how to prepare some statistic but to be honest I do not now how to approach the issues. ...

    Started by bciepluch‎, 11-23-2012 07:59 AM
    • Replies: 1
    • Views: 1,017
    11-24-2012, 07:55 AM Go to last post
  19. Customer satisfaction survey (data analysis)

    Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

    Started by lassekk‎, 11-27-2012 05:33 AM
    • Replies: 5
    • Views: 3,173
    11-28-2012, 02:13 AM Go to last post
  20. Cut-off

    I am reading an article where 5 has been set as a cut-off score. No > or >= symbols are given, and I don't know whether a score of 5 would identify...

    Started by apple‎, 05-12-2009 08:03 AM
    • Replies: 0
    • Views: 2,538
    05-12-2009, 08:03 AM Go to last post
  21. Cut-off criterion for likert scales

    Dear all, I really need some help solving the following problem: I am currently finalizing my master thesis and I am still insecure about a...

    Started by Amowiel‎, 11-18-2010 04:47 AM
    • Replies: 0
    • Views: 5,194
    11-18-2010, 04:47 AM Go to last post
  22. Cut-off Points in Linear Discriminant Analysis

    Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

    Started by shike‎, 09-15-2008 11:55 PM
    • Replies: 2
    • Views: 5,739
    09-16-2008, 02:22 AM Go to last post
  23. 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: 3,247
    11-21-2016, 01:51 PM Go to last post
  24. Data analysis : replication and pseudoreplication

    I have several questions concerning analysis of data, especially when there are replications and/or pseudoreplications. First, I read an example...

    Started by statah‎, 10-23-2014 08:41 PM
    • Replies: 0
    • Views: 2,237
    10-23-2014, 08:41 PM Go to last post
  25. data analysis for likert scale

    i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

    Started by akluima‎, 10-01-2012 04:30 AM
    • Replies: 2
    • Views: 1,656
    10-01-2012, 08:39 AM Go to last post
  26. Lightbulb Data Analysis visualization

    Hi Everyone, Lately I have been searching a data analyzer tool/software, which would also present my data in a better way. I came across DataPlay...

    Started by john-rose‎, 02-26-2016 03:07 AM
    analyze, data, presentation, research, visual
    • Replies: 0
    • Views: 1,026
    02-26-2016, 03:07 AM Go to last post
  27. Data Capture

    I'm not sure if this is the correct place to ask this question. I have a support team in my office and I want to understand why people are calling...

    Started by kiwis‎, 03-06-2015 02:06 PM
    • Replies: 1
    • Views: 1,392
    03-06-2015, 05:27 PM Go to last post
  28. Data clustering, error and closness formula lemma

    I need to know how error and closeness formulas, attached in file are formed or what is the significance of these formulas?

    Started by vnv2004‎, 09-01-2013 11:51 AM
    • Replies: 0
    • Views: 1,419
    09-01-2013, 11:51 AM Go to last post
  29. Data collection

    Hi everyone, i have a simple question that i actually cant get my head around (have been working on this assignment far to long and hard!) The...

    Started by emmayo‎, 08-05-2013 11:39 PM
    • Replies: 0
    • Views: 968
    08-05-2013, 11:39 PM Go to last post
  30. Data Collection

    I am an education major and am lost in my research class! I have the research question of, "How does classical music playing in the background...

    Started by GradStudent17‎, 03-15-2017 06:53 AM
    • Replies: 1
    • Views: 1,273
    03-15-2017, 07:28 AM Go to last post
  31. Data collection gone awry -- now what do I do?

    Trying to keep this as brief as possible ... I handle the stats for a pilot project for my employer (a government agency). We're trying to...

    Started by Berley‎, 03-30-2010 02:21 PM
    • Replies: 0
    • Views: 2,332
    03-30-2010, 02:21 PM Go to last post
  32. Data collection???

    First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

    Started by Wevans2303‎, 03-22-2012 07:04 PM
    • Replies: 2
    • Views: 1,467
    03-22-2012, 07:52 PM Go to last post
  33. data comparison from questionnaire in different languages

    Hello, I am working for an NGO helping migrant workers. We want to conduct a study assessing the mental health of migrant domestic workers in...

    Started by mayia‎, 06-13-2013 03:11 AM
    • Replies: 1
    • Views: 1,186
    06-13-2013, 09:26 AM Go to last post
  34. Data Groveling

    I am in the market for biomedical assay data that has lower detection limits and preferably be longitudinal. Someone asked me to find some...

    Started by fed1‎, 04-01-2010 06:05 PM
    • Replies: 0
    • Views: 1,835
    04-01-2010, 06:05 PM Go to last post
  35. 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: 2,099
    08-04-2011, 10:19 AM Go to last post
  36. Data request (if that is allowed) concerning university enrollment figures in the USA

    Hi Everybody, I am struggling finding data that I am sure exists, so I figured I would reach out for help (if this sort of thing is not allowed...

    Started by Salohcin‎, 06-12-2013 04:26 PM
    • Replies: 2
    • Views: 1,095
    06-19-2013, 07:58 PM Go to last post
  37. Data Set of Pattern Recognition

    I need help in looking for a data set for classification. The kind of data I am looking for are where measurements are available from experimental...

    Started by teotjunk‎, 01-09-2012 02:24 AM
    • Replies: 1
    • Views: 2,143
    01-09-2012, 03:15 AM Go to last post
  38. 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: 1,926
    08-05-2011, 09:45 PM Go to last post
  39. Lightbulb Data transformation and kruskal-wallis

    Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

    Started by Rak3l‎, 02-28-2012 11:46 AM
    kruskal-wallis
    • Replies: 2
    • Views: 2,211
    02-28-2012, 12:00 PM Go to last post
  40. data transformation links please

    Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

    Started by yoma819‎, 08-15-2010 04:25 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,535
    08-16-2010, 11:59 AM Go to last post
  41. data transformation software

    Does anyone know of any software that will transform data to normality for me? specifically first one: lognormal second one:burr(4p) third one:...

    Started by yoma819‎, 08-17-2010 11:49 AM
    • Replies: 2
    • Views: 3,038
    08-17-2010, 01:08 PM Go to last post
  42. Data Transformations

    I'm working with 15 variables or so in a dataset (n=5,000ish) and one of the variables has a strong negative skew to it (skew = -.947, std. error =...

    Started by PikeyJM‎, 04-08-2013 01:20 PM
    • Replies: 3
    • Views: 2,020
    04-08-2013, 05:53 PM Go to last post
  43. Dealing with censored dates as regressors

    I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

    Started by nbi‎, 03-30-2017 07:30 AM
    censoring, regression, time-series
    • Replies: 2
    • Views: 850
    04-13-2017, 11:31 AM Go to last post
  44. Dealing with missing values in cluster analysis

    I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

    Started by fabiangmueller‎, 07-15-2016 05:04 PM
    • Replies: 5
    • Views: 1,146
    07-16-2016, 06:53 AM Go to last post
  45. Dealing with regression to the mean

    If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

    Started by Palermo‎, 01-11-2017 08:10 AM
    • Replies: 4
    • Views: 2,978
    01-12-2017, 10:52 PM Go to last post
  46. dealing with unequal sample sizes... can anyone help please?

    Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

    Started by ellie_w‎, 11-17-2014 10:10 AM
    representativeness, unequal sample sizes
    • Replies: 7
    • Views: 2,498
    11-18-2014, 04:14 AM Go to last post
  47. Dealing with unknown dependencies between variables

    Hi! I have a system where I'm studying 3 different diseases, however they share some pathological similarities. There is no data on them being...

    Started by Szkeptik‎, 02-26-2017 08:31 AM
    • Replies: 2
    • Views: 2,012
    02-26-2017, 10:51 PM Go to last post
  48. Decision Tree with Binary Target

    Hello, I have a dataset with a number of inouts and a binary target. I want to build a decision tree model. SAS states that the predictions can be...

    Started by zarasandreas‎, 09-24-2012 08:36 AM
    • Replies: 1
    • Views: 1,263
    09-24-2012, 09:56 AM Go to last post
  49. Deck of cards: Odds of being dealt 3 of a suit?

    I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

    Started by domino‎, 09-15-2008 03:31 AM
    • Replies: 2
    • Views: 8,505
    09-15-2008, 09:46 AM Go to last post
  50. Cool Definition of deflated

    Hello guys Do you know what do they mean by "deflated" in the following sentence? "firms reported goodwill impairment loss ( expressed as...

    Started by Lisa92‎, 02-13-2016 04:58 PM
    • Replies: 3
    • Views: 1,936
    02-13-2016, 08:13 PM Go to last post
  51. Degrees of freedom for Chi2 normality test

    I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a...

    Started by Riccardo‎, 09-01-2014 04:31 PM
    chi square, chi square test, degrees of freedom, normality test
    • Replies: 3
    • Views: 2,870
    09-02-2014, 12:49 AM Go to last post
  52. Delta method to assess the confidence and prediction intervals

    I want to calculate the table of confidence and prediction intervals for a custom Cumulative Distribution Function or CDF, and I am following the...

    Started by Jpalbae‎, 07-30-2014 05:01 AM
    • Replies: 0
    • Views: 1,082
    07-30-2014, 05:01 AM Go to last post
  53. demographic stats for choosing where to live

    Given the vast amount of demographic information on sites like: http://quickfacts.census.gov/qfd/index.html Could I could take a subset of...

    Started by kstus‎, 10-02-2009 02:27 PM
    • Replies: 2
    • Views: 2,339
    01-01-2010, 09:35 PM Go to last post
  54. Dependance between categorical variables in a whole population

    Hello, I have a population of 507 documents (which represent the entire phenomena studied at a give time period) from which a series of variables...

    Started by AndiMonge‎, 09-17-2013 07:39 PM
    association, bivariate correlations, chi square, dependent variables, whole population
    • Replies: 0
    • Views: 755
    09-17-2013, 07:39 PM Go to last post
  55. dependent cases in logsitic regression, any recourse?

    I'm hoping to use logistic regression to analyze a 2x3 repeated-measures factorial design. The IVs are both categorical. The DV is dichotomous...

    Started by reductico‎, 06-08-2010 01:52 PM
    • Replies: 0
    • Views: 2,163
    06-08-2010, 01:52 PM Go to last post
  56. dependent correlations significance test

    Hi all, I have a test score with which I want to explain another test difference score (post-pre), under 4 conditions. All conditions are...

    Started by roysarel‎, 01-19-2014 03:29 AM
    dependent correlations
    • Replies: 0
    • Views: 1,418
    01-19-2014, 03:29 AM Go to last post
  57. Derivation of OLS residuals and asymptotic properties

    Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

    Started by artzahar‎, 03-11-2015 07:45 PM
    • Replies: 0
    • Views: 1,002
    03-11-2015, 07:45 PM Go to last post
  58. deriving critical level of significance for Bonferroni correction in my data?

    We have conducted an experiment where we test ability to detect weights using two different methods using a repeated measures design. Each...

    Started by j482‎, 11-15-2012 07:44 AM
    boneferroni correction, friendmans anova, number of comparisions, post-hoc
    • Replies: 1
    • Views: 1,360
    11-15-2012, 10:10 AM Go to last post
  59. Deriving meaningful information from a set.

    Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

    Started by vivek_12315‎, 01-23-2011 02:05 PM
    mining, stats
    • Replies: 5
    • Views: 2,808
    01-23-2011, 04:22 PM Go to last post
  60. Describing a curve in order to compare with species abundance

    Hi, I was wondering if there was an established method / algorithm for describing a curve (in this case, grain-size data) in order to compare...

    Started by nicknara25‎, 04-11-2008 05:31 AM
    • Replies: 0
    • Views: 3,430
    04-11-2008, 05:31 AM Go to last post

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