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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: 18,695
    10-11-2014, 12:02 PM Go to last post
  1. Cool Post hoc test for the multisample median test

    Hi all, I have a question about an investigation that i have developed. Specifically, i was comparing abundance of flyes among different...

    Started by sureño‎, 03-05-2012 08:27 PM
    • Replies: 0
    • Views: 3,243
    03-05-2012, 08:27 PM Go to last post
  2. 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: 3,241
    03-14-2011, 05:35 PM Go to last post
  3. Help with Customer Satisfaction data analysis (Correlation/ANOVA)

    I'm working on an analysis of a customer satisfaction survey, where I'm trying analyze the link between respondent's stated likelihood to recommend...

    Started by mpschulm‎, 11-11-2012 09:03 PM
    anova, correlation, customer satisfaction, net promoter score
    • Replies: 1
    • Views: 3,241
    11-12-2012, 09:19 AM Go to last post
  4. Latin Hypercube sampling with correlations

    Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

    Started by Vlob‎, 07-07-2010 02:57 AM
    • Replies: 0
    • Views: 3,236
    07-07-2010, 02:57 AM Go to last post
  5. HLM Sample size and Equality of Groups

    Hi, I have 3 data points (Fall, Winter, Spring) regarding the oral reading fluency of 2 groups of children collected over a school year....

    Started by gracie3‎, 09-25-2010 07:31 PM
    • Replies: 0
    • Views: 3,229
    09-25-2010, 07:31 PM Go to last post
  6. Post [ASK] [Quantification Theory Type I] Kansei Engineering Reference

    Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

    Started by Gema‎, 08-23-2014 12:44 AM
    • Replies: 1
    • Views: 3,228
    03-11-2015, 05:17 PM Go to last post
  7. Help with t-test data analysis

    Hi everyone, I am a bit lost when it comes to stats, having only had a tiny amount of it so far. In my biology class we are writing a paper on if...

    Started by dbaker‎, 03-23-2011 07:31 PM
    • Replies: 3
    • Views: 3,226
    04-05-2011, 05:19 AM Go to last post
  8. Paired t-test?

    Hello, I have been working with higher level statistics for so long that I have started to forget rudimentary techniques... I have a sample of...

    Started by waeggles‎, 10-03-2011 01:12 PM
    • Replies: 5
    • Views: 3,226
    10-03-2011, 04:32 PM Go to last post
  9. Median or Mean vs Data distribution

    Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

    Started by alwaqfi‎, 12-25-2016 09:04 AM
    • Replies: 3
    • Views: 3,225
    12-26-2016, 09:50 AM Go to last post
  10. FDR or FWER with DIFFERENT tests

    hello everyone, My question is about correcting p-values for multiple testing, either through False Discovery Rate or FamilyWise Error Rate...

    Started by mathilde‎, 12-16-2010 03:25 PM
    • Replies: 1
    • Views: 3,224
    05-08-2013, 02:24 AM Go to last post
  11. S.t.d Calculation of different populations

    Hello. I have n different populations with their means and their standard deviations. All these different populations follow the Gaussian...

    Started by dervast‎, 05-13-2010 11:16 AM
    • Replies: 5
    • Views: 3,222
    05-18-2010, 08:36 AM Go to last post
  12. 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: 3,222
    04-05-2011, 03:52 PM Go to last post
  13. OLS assumptions after estimating robust standard errors

    Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

    Started by andony‎, 04-29-2009 10:54 AM
    • Replies: 1
    • Views: 3,220
    05-01-2009, 12:43 AM Go to last post
  14. Question Multiple Imputation of Pre-Composite Scores

    I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

    Started by Fulanito de Tal‎, 02-21-2012 10:53 AM
    • Replies: 4
    • Views: 3,220
    03-02-2012, 06:33 PM Go to last post
  15. Random sample - how to get one?

    Hi, I’m doing a research on job satisfaction in lawyers and I would like to use a random sample. My question is: how can I do this? In the whole...

    Started by L.A.‎, 06-17-2011 06:12 PM
    random sample
    • Replies: 5
    • Views: 3,218
    06-18-2011, 09:03 AM Go to last post
  16. 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: 3,215
    03-06-2011, 04:44 PM Go to last post
  17. How to prove the UMVUE under these conditions

    Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

    Started by egpivo‎, 04-05-2010 07:54 AM
    • Replies: 3
    • Views: 3,211
    04-06-2010, 12:00 PM Go to last post
  18. 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: 3,209
    11-28-2012, 02:13 AM Go to last post
  19. Post What should i do after factor analysis output ?

    Hello, I am having a construct name trust that includes the following constructs: 1 - Benevolence ( 3 Items) 2 - Integrity ( 6 Items ) 3 -...

    Started by hanialbarni‎, 11-19-2014 10:11 AM
    • Replies: 3
    • Views: 3,204
    11-20-2014, 09:10 PM Go to last post
  20. Difficult forecasting/ density estimation problem in an experimental setting

    Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given player’s...

    Started by whaddup‎, 07-02-2011 04:23 PM
    • Replies: 4
    • Views: 3,203
    07-05-2011, 12:27 PM Go to last post
  21. Time Series

    Hi everyone, I've been reading some papers that talk about fractality (hurst exponent) in physiological time series (ekg, eeg, gait, etc.). I was...

    Started by chickduckduck‎, 11-23-2009 03:32 AM
    • Replies: 0
    • Views: 3,202
    11-23-2009, 03:32 AM Go to last post
  22. How robust is ANOVA's F-statistic?

    Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

    Started by bimodal‎, 06-29-2012 12:28 PM
    • Replies: 3
    • Views: 3,202
    06-29-2012, 01:48 PM Go to last post
  23. How to compare the slopes of two graphs or trend lines

    Hi I have 2 variables which trend over time ( by year). One variable is the mutation rate and the other is drug use. There are 333 samples each...

    Started by vanhas‎, 08-27-2015 08:03 AM
    • Replies: 1
    • Views: 3,196
    08-27-2015, 11:02 AM Go to last post
  24. standard error, confidence interval of relative difference?

    Hi all, For a plant biology research project i am doing, I want to describe the relative difference between control and treatment. The plants...

    Started by jasperv21‎, 06-27-2013 03:34 PM
    • Replies: 2
    • Views: 3,193
    06-27-2013, 03:41 PM Go to last post
  25. Correlation/Regression using Aggregrated Data

    Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

    Started by EH11‎, 10-30-2008 07:44 AM
    • Replies: 0
    • Views: 3,192
    10-30-2008, 07:44 AM Go to last post
  26. Lightbulb A question regarding correlation and regression for a seminar

    Hello, Im doing a seminar in which the dependent variable is work centrality which is an interval one. the independent variable is age (ratio),...

    Started by gidlin1‎, 12-25-2013 02:16 AM
    • Replies: 1
    • Views: 3,192
    12-25-2013, 04:01 AM Go to last post
  27. SOS action research project question

    Firstly, I am grateful for any assistance. I am a novice who tries hard :yup: I am trying to write up the results section for a report and have...

    Started by zcl‎, 12-28-2016 11:47 PM
    • Replies: 1
    • Views: 3,192
    12-29-2016, 08:48 AM Go to last post
  28. Help needed urgently - dichotomous question

    Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

    Started by hsaharmo‎, 07-27-2011 07:32 AM
    • Replies: 5
    • Views: 3,184
    07-28-2011, 07:54 AM Go to last post
  29. sum of truncated Normal Variables

    Hello all, I am trying to find if there exists a closed solution for the following: X~N(u,var) {normal dist) Y~N((u,var)|Y>a) {truncated normal...

    Started by alondo‎, 08-21-2012 03:23 AM
    distibution, normal, probability, sum of normal, truncated
    • Replies: 0
    • Views: 3,182
    08-21-2012, 03:23 AM Go to last post
  30. Question about parametric and nonparametric tests and non-probability sampling

    I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have...

    Started by momanger‎, 11-03-2016 03:07 PM
    non probability, nonparametric, parametric
    • Replies: 3
    • Views: 3,182
    11-03-2016, 04:56 PM Go to last post
  31. Where do I start?

    Hi! I'm feeling overwhelmed here and don't know where to start. It is the second message regarding my project and any additional help would be...

    Started by Merlion‎, 01-20-2009 01:08 PM
    • Replies: 1
    • Views: 3,177
    01-21-2009, 09:40 AM Go to last post
  32. Grade (A, A-, B+, B, B-....)

    Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

    Started by studentdoctor‎, 03-16-2011 12:55 PM
    • Replies: 2
    • Views: 3,177
    04-11-2011, 06:32 AM Go to last post
  33. correlation coefficient

    Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

    Started by francija‎, 02-14-2012 12:51 AM
    • Replies: 5
    • Views: 3,170
    02-14-2012, 01:15 AM Go to last post
  34. Permanova design for BACI study (using Primer)

    my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

    Started by doddel‎, 08-01-2013 08:25 AM
    • Replies: 5
    • Views: 3,165
    08-09-2013, 03:51 AM Go to last post
  35. Question Normality analysis

    hye guys... i need a help.. Can someone show me how to run the normality analysis... In my questionnaires, I have 4 independent variables and...

    Started by ryan88‎, 01-26-2011 11:08 AM
    • Replies: 7
    • Views: 3,158
    02-09-2011, 06:58 PM Go to last post
  36. How do I use PERMANOVA/interpret the results

    I am doing this research project comparing the snail community across two species of sea grass. Ten sample quadrats were collected from each sea...

    Started by Nithya‎, 10-24-2015 05:18 AM
    • Replies: 1
    • Views: 3,155
    10-24-2015, 07:52 AM Go to last post
  37. adj. r-square

    I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

    Started by eunkum1‎, 05-02-2014 01:20 PM
    • Replies: 8
    • Views: 3,154
    05-02-2014, 05:10 PM Go to last post
  38. Help need on 'Panel Corrected Standard Errors' in SAS

    I have panel regression to estimate with time fixed effects and correcting standard errors using 'Panel Corrected Standard Errors', where PCSE...

    Started by jb2755‎, 01-24-2012 02:25 PM
    • Replies: 0
    • Views: 3,152
    01-24-2012, 02:25 PM Go to last post
  39. Need guidance in determining how to analyze my data

    Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

    Started by canadianjameson‎, 10-25-2011 02:31 PM
    • Replies: 1
    • Views: 3,149
    10-25-2011, 03:44 PM Go to last post
  40. How to Analyze this data?

    OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

    Started by DFoley‎, 10-03-2011 06:02 PM
    • Replies: 7
    • Views: 3,148
    10-05-2011, 11:38 AM Go to last post
  41. Question Probability Density Function needed

    I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

    Started by pandre‎, 05-25-2010 04:51 AM
    • Replies: 1
    • Views: 3,146
    06-01-2010, 09:10 AM Go to last post
  42. What kind of tests i can do to see if two diseases are related

    I am using data from this website (data is at the bottom of the page) for a case-study. For the sake of question lets stick to any of FluWatch sheet...

    Started by x509‎, 11-22-2016 11:04 AM
    • Replies: 5
    • Views: 3,145
    11-22-2016, 02:02 PM Go to last post
  43. Factor Analysis Transformations: Thesis Help Needed Please!

    Hi I'm really hoping that someone will be able to help me? I am currently in the process of running a factor analysis. The individual items...

    Started by Kellyb‎, 08-20-2008 03:27 PM
    • Replies: 1
    • Views: 3,141
    08-20-2008, 04:06 PM Go to last post
  44. Bayesian Logistic Regression

    I have the following logistic regression problem I am trying to solve using bayesian approach. " We consider a logistic regression setting where...

    Started by vioravis‎, 10-13-2008 03:09 PM
    • Replies: 0
    • Views: 3,141
    10-13-2008, 03:09 PM Go to last post
  45. Testing Accuracy of Tridiagonal Matrix Computation

    So I implemented a lanczos algorithm which tridiagonalizes a real symmetric matrix. However, I don't know if my result is accurate. How would I be...

    Started by senorbum‎, 07-09-2008 09:53 AM
    • Replies: 0
    • Views: 3,140
    07-09-2008, 09:53 AM Go to last post
  46. Polynomial interaction in a mixed-design ANOVA

    My analysis includes a between-group factors (condition ) and several within-subjects continuous factors (cholesterol, glucose, mass). The...

    Started by smsdegree‎, 07-13-2011 07:03 PM
    interaction, linear, repeated
    • Replies: 0
    • Views: 3,140
    07-13-2011, 07:03 PM Go to last post
  47. 1 way Anova vs Two Way Anova -HELP needed

    I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

    Started by BryRai‎, 01-03-2017 04:22 PM
    • Replies: 2
    • Views: 3,135
    01-05-2017, 09:06 AM Go to last post
  48. Question 2x2 Repeated Measures ANOVA

    Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

    Started by Pedro‎, 10-25-2012 05:46 PM
    anova, two way
    • Replies: 4
    • Views: 3,134
    10-26-2012, 09:02 AM Go to last post
  49. Dickey Fuller Test

    I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

    Started by zarasandreas‎, 11-24-2011 12:54 PM
    dickey fuller, econometrics, stationarity
    • Replies: 1
    • Views: 3,133
    11-25-2011, 01:49 AM Go to last post
  50. Confusions regarding Regression, Multicollinearity and Factor Analysis

    I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

    Started by Blain Waan‎, 01-16-2013 08:00 AM
    factor analysis, multicollinearity, regresion analysis
    • Replies: 2
    • Views: 3,133
    01-29-2013, 03:18 PM Go to last post
  51. Isotonic Regression

    Hello, I would like to ask if someone knows the answers to the next questions: 1. When do I use Isotonic Regression and why ? 2. What's the...

    Started by WeeG‎, 03-20-2009 04:19 PM
    • Replies: 0
    • Views: 3,130
    03-20-2009, 04:19 PM Go to last post
  52. which statistic analysis-percentage frequency data-protocol analysis

    I have done a research with designers. I collect the data from every one separately through protocol analysis. I want to find the association...

    Started by Elaheh‎, 11-30-2016 11:35 AM
    • Replies: 0
    • Views: 3,129
    11-30-2016, 11:35 AM Go to last post
  53. Sample Size Help for Observation Study

    I wanted to calculate sample size for a single group, observational study. I'll be using a questionnaire to predict outcome (i.e. score on another...

    Started by murphy‎, 12-15-2016 11:36 PM
    • Replies: 4
    • Views: 3,127
    12-16-2016, 10:29 AM Go to last post
  54. Chi Square - confused which variables to use.

    Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

    Started by Bluerosebowl‎, 11-04-2011 04:52 PM
    • Replies: 4
    • Views: 3,123
    11-14-2011, 08:38 AM Go to last post
  55. 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: 3,117
    06-30-2014, 06:25 PM Go to last post
  56. Post How to test data if it is normal distribution in spss ?

    Hello Good morning guys i will need some help truly i have variables in spss most of them scale type, some of them are nominal, and few are...

    Started by hanialbarni‎, 11-12-2014 11:29 PM
    distribution, graph, normal, problem formulation, spss
    • Replies: 6
    • Views: 3,115
    11-18-2014, 03:01 AM Go to last post
  57. Help with quick but major statistical school project!

    only two questions, wont take long... would really apprechiate some replys The pool can be found here: http://www.misterpoll.com/polls/515408 ...

    Started by krisolskro‎, 02-04-2011 03:05 PM
    • Replies: 0
    • Views: 3,114
    02-04-2011, 03:05 PM Go to last post
  58. Red face Could anyone recommend an interactive application for mass data analysis?

    Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

    Started by bestbird7788‎, 05-22-2012 02:53 AM
    analysis, database, interactive, mass data, sql
    • Replies: 13
    • Views: 3,109
    05-31-2012, 09:25 PM Go to last post
  59. presenting results of simple correlations and multiple regressions in the same paper

    I recently got comments back from a reviewer on a manuscript, criticizing my use of simple correlation and multiple regression analyses to study the...

    Started by l3a9k‎, 05-03-2012 12:31 PM
    • Replies: 2
    • Views: 3,108
    05-04-2012, 07:55 AM Go to last post
  60. The joint normality of the two estimates for linear regression model

    I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

    Started by waynetang‎, 12-21-2012 12:46 PM
    • Replies: 13
    • Views: 3,106
    12-22-2012, 12:27 PM Go to last post

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