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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: 18,765
    10-11-2014, 12:02 PM Go to last post
  1. Testing Research Hypothesis

    Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

    Started by ghada8888‎, 11-14-2011 12:39 PM
    • Replies: 4
    • Views: 2,815
    11-15-2011, 08:59 AM Go to last post
  2. Standard Deviation of non-numerical data

    I am trying to determine the standard deviation data that is not itself numerical, but its count is. For example, If I have a dataset from a survey...

    Started by Ghostbusters‎, 03-05-2015 03:51 PM
    • Replies: 0
    • Views: 2,626
    03-05-2015, 03:51 PM Go to last post
  3. Significance of Correspondence Analysis clusterings

    Dear All, I would like to ask you about Correspondence Analysis. I am wondering if does any strategy exist to test the significance of the...

    Started by gianmarco‎, 12-30-2009 01:28 PM
    • Replies: 4
    • Views: 4,619
    01-03-2010, 02:27 AM Go to last post
  4. when Bootstrap Correlation coefficient (Pearson) con be used?

    Hi! Though I know the mechanics of the bootstrap methods, I am do not manage to find in literature a clear-cut explanation about when and in what...

    Started by gianmarco‎, 10-26-2010 06:19 AM
    • Replies: 0
    • Views: 4,111
    10-26-2010, 06:19 AM Go to last post
  5. how would you comment this frequency distribution?

    Hi! I would like to have some feedback on the attached frequency distribution histogram. It displays the bootstrap distribution of Spearman rs. ...

    Started by gianmarco‎, 10-27-2010 05:59 AM
    • Replies: 0
    • Views: 6,844
    10-27-2010, 05:59 AM Go to last post
  6. Bootstrap Spearman coeff.: intepreting results

    Hi! I would very appreciate if someone can kindly provide some hints on the following issue. I am interested in the correlation between two...

    Started by gianmarco‎, 11-09-2010 11:29 AM
    • Replies: 6
    • Views: 9,736
    11-14-2010, 07:02 AM Go to last post
  7. Probability question for an archaeological case

    Hi Guys, I would appreciate to have help on the following. I have no extensive math background, so I can anticipate that I can only limit myself to...

    Started by gianmarco‎, 12-13-2012 11:49 AM
    • Replies: 6
    • Views: 1,496
    12-15-2012, 02:19 AM Go to last post
  8. correlation between 3 categor variable: what to do if 2 are strongly correlated?

    Hi Guys, sorry for the thread title; may be it is rather obscure :shakehead I would appreciate to hear from you about what is the best way to...

    Started by gianmarco‎, 05-02-2013 10:00 AM
    • Replies: 2
    • Views: 2,392
    05-04-2013, 05:22 AM Go to last post
  9. measure of effect size for categorical association

    Hello, I am having difficulties in wrapping my head around an issue regarding chi-squared statistic, Cramer's V, and Cohen's measure of effect...

    Started by gianmarco‎, 11-03-2016 03:37 AM
    • Replies: 1
    • Views: 2,767
    11-03-2016, 08:20 AM Go to last post
  10. 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: 3,200
    12-25-2013, 04:01 AM Go to last post
  11. 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: 1,362
    09-27-2011, 07:25 AM Go to last post
  12. What is the opposite of partial differentiation?

    Hi all This is in context with my earlier post (28/09) on Rearward Amplification, but it does not necessarily need to be read. I have had a...

    Started by gidon‎, 10-09-2011 07:58 AM
    • Replies: 0
    • Views: 4,201
    10-09-2011, 07:58 AM Go to last post
  13. Integrating two indices

    Hi, I've 2 series of indices for the years 2000-2013 with different ranges, One ranges from 70 to 100, while the other ranges from 196 to 306. If...

    Started by GIS‎, 04-18-2013 04:16 AM
    • Replies: 6
    • Views: 1,657
    04-21-2013, 08:26 PM Go to last post
  14. How to compare standard deviation?

    Hi, I have several sets of data that are rather different in their absolute numerical range. Some datasets stretches between 20-40, and others...

    Started by GIS‎, 05-12-2013 06:13 AM
    • Replies: 1
    • Views: 1,686
    05-12-2013, 12:15 PM Go to last post
  15. Question Understanding ARIMA

    Hi, I am trying to decompose time series contains approx. 120 observations. Using ARIMA(p,d,q) model I need to find three parameters: d - this one...

    Started by GIS‎, 01-01-2014 08:41 AM
    • Replies: 0
    • Views: 1,380
    01-01-2014, 08:41 AM Go to last post
  16. Compare type of procedure with an outcome - which analysis is best?

    Good morning, I'm writing a medical meta-analysis, and I need help with a part of the statistical analysis. I gathered articles from various...

    Started by giuly_gt‎, 11-05-2014 08:55 AM
    • Replies: 0
    • Views: 1,640
    11-05-2014, 08:55 AM Go to last post
  17. school project

    Hello, I am doing a project for school and am in need of some advice. I want to do something to do with the gubernatorial primary election in NJ...

    Started by givesyouwings‎, 05-30-2009 09:33 PM
    • Replies: 0
    • Views: 2,008
    05-30-2009, 09:33 PM Go to last post
  18. Can anyone help please?

    Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

    Started by gizmo00‎, 05-08-2011 02:45 PM
    • Replies: 3
    • Views: 1,721
    05-12-2011, 10:59 AM Go to last post
  19. Negative Cronbach !

    Can anyone help me, I am having a negative cronbach value.. Does it mean my data is unreliable? I have a set of 10 questions with likert scale...

    Started by gizmo00‎, 05-09-2011 01:17 PM
    • Replies: 2
    • Views: 2,230
    05-09-2011, 05:03 PM Go to last post
  20. HLM Graphics

    Hi Guys, i am working with hlm 7 and a 3-level-Model. I analyse if Extraversion is a Moderator between Event Leader/employe (for example positive...

    Started by gl4diator‎, 06-13-2015 09:32 AM
    • Replies: 0
    • Views: 1,222
    06-13-2015, 09:32 AM Go to last post
  21. Meta-Regression

    Hi! I just want to ask if there are people familiar with Meta-Regression/Meta-Regression Analyses (MRA). I'm planning to have it as an Undergraduate...

    Started by Gladys Grace‎, 09-14-2013 05:06 AM
    meta-analysis, meta-regression, regression, thesis
    • Replies: 0
    • Views: 1,137
    09-14-2013, 05:06 AM Go to last post
  22. General inverse variance method

    Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know...

    Started by glassman365‎, 01-25-2016 07:14 AM
    meta analysis, odds ratio, standard error
    • Replies: 1
    • Views: 1,321
    01-25-2016, 08:55 AM Go to last post
  23. Red face Interpreting Kruskal-Wallis results

    Hi all, I've just finished my undergrad thesis and the reviewers strongly recommended that I pursue formal publication of my results. I thought...

    Started by glenn.althor‎, 07-29-2014 09:47 PM
    • Replies: 10
    • Views: 4,581
    08-03-2014, 04:53 PM Go to last post
  24. Correlation significance critical values

    I've been trying to determine the critical value for a sample size of 168 but all the tables only indicate values up to 100 (most of them). Is there...

    Started by globaljaco‎, 01-15-2015 07:50 AM
    • Replies: 1
    • Views: 1,323
    01-15-2015, 08:41 AM Go to last post
  25. Composite Hypothesis Testing Problem

    Hello guys, So I have this problem I am trying to solve and its

    Started by glorean‎, 05-10-2015 04:48 PM
    inference, statistics
    • Replies: 0
    • Views: 961
    05-10-2015, 04:48 PM Go to last post
  26. Individual score to group mean comparison! Which test?

    Hello guys! I studied a lot of statistics during my psychology degree and masters in 2000-04 but I got very rusty since then! I tried to brush up...

    Started by gmart‎, 07-09-2014 04:17 PM
    • Replies: 2
    • Views: 3,998
    07-10-2014, 05:10 AM Go to last post
  27. reporting statistical results

    I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

    Started by godfather‎, 02-06-2009 03:39 AM
    • Replies: 2
    • Views: 4,094
    02-09-2009, 10:12 AM Go to last post
  28. two probability levels in regression tables

    I was wondering if is is common practice to identify betas that are significant at either the .05 and .001 level. e.g., If I decide to set my p level...

    Started by godfather‎, 06-24-2009 01:14 AM
    • Replies: 1
    • Views: 3,000
    06-24-2009, 01:24 AM Go to last post
  29. What N to record for regression table?

    Is it the outcome variable (dependent variable) N that I report in a regression table?

    Started by godfather‎, 08-20-2009 07:08 PM
    • Replies: 0
    • Views: 1,915
    08-20-2009, 07:08 PM Go to last post
  30. p =.046 significant?

    If I get a probability value of .046 is this considered significant given significance level of .05?

    Started by godfather‎, 08-24-2009 07:14 PM
    • Replies: 5
    • Views: 8,038
    09-02-2009, 10:46 AM Go to last post
  31. 2 Sample T Test for Nonnormal data

    Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

    Started by goducks13‎, 04-05-2013 08:48 PM
    • Replies: 10
    • Views: 2,707
    04-09-2013, 07:13 PM Go to last post
  32. How to predict the uncertain parameter

    Hi, I am trying to predict the value of a parameter(Y) with varying frequency(X2) and X1(stall parameter). Y X1 ...

    Started by gokussj9‎, 11-07-2013 06:45 PM
    • Replies: 1
    • Views: 1,500
    11-07-2013, 09:56 PM Go to last post
  33. 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: 3,253
    09-25-2010, 07:31 PM Go to last post
  34. 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: 2,584
    11-10-2008, 02:13 AM Go to last post
  35. 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: 1,297
    03-15-2017, 07:28 AM Go to last post
  36. non-parametric equivalent for mixed-factorial design

    I have to analyze my confidence data which is measured using a likert scale (1 7). Because its ordinal in nature, I need to use non-parametric...

    Started by gradstudent87‎, 04-27-2011 04:12 PM
    • Replies: 2
    • Views: 3,643
    04-27-2011, 11:13 PM Go to last post
  37. Conditional distribution for covariance matrix with constraint

    Hi, I'm trying to work out how to draw from the conditional distribution for a covariance matrix given some correlated multivariate Gaussian data....

    Started by graeme‎, 08-11-2014 10:41 PM
    • Replies: 2
    • Views: 1,643
    08-12-2014, 11:16 AM Go to last post
  38. A power analysis question - am I making a big mistake?

    Help! It's a very long time since I have had to tackle Power Analysis but I have recently been handed a couple of problems, one of which I hope...

    Started by Graham‎, 01-01-2010 05:36 PM
    • Replies: 0
    • Views: 2,242
    01-01-2010, 05:36 PM Go to last post
  39. Choosing a proper statistical test

    Hi! I want to perform a statistical test, but I'm not sure which one I should use. Please note that this is a hypothetical example so I will not...

    Started by grandpa‎, 04-26-2012 07:28 AM
    • Replies: 1
    • Views: 1,506
    04-26-2012, 03:22 PM Go to last post
  40. Exclamation Reading Research - ANCOVA?

    I have a class (n=30).Using a variety of test I split them into stronger readers - SR (16), weaker readers WR (14) - Quasi-experimental I chose a...

    Started by Grant‎, 12-29-2009 09:05 AM
    • Replies: 0
    • Views: 2,919
    12-29-2009, 09:05 AM Go to last post
  41. Several nested categorical ecological variables, appropriate test?

    Hi all, this is my first post. I've looked through the FAQ and links to selecting a test, but haven't found an example of a test similar to my own. ...

    Started by grant13951‎, 08-12-2012 09:54 AM
    • Replies: 0
    • Views: 1,543
    08-12-2012, 09:54 AM Go to last post
  42. A question regarding Cronbach's Alpha

    Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

    Started by graphicsgriffin‎, 09-18-2011 06:25 AM
    • Replies: 2
    • Views: 2,462
    01-24-2015, 03:18 PM Go to last post
  43. likelihood in two parameters

    Hi guys, i'm new here! I'm an italian student. i would like to begin with a very stupid question :) i'm reading a paper on the likelihood ratio...

    Started by gravity_rainbow‎, 01-18-2012 05:27 PM
    • Replies: 3
    • Views: 1,830
    01-18-2012, 05:44 PM Go to last post
  44. standardize by population density

    I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

    Started by grayskillen‎, 04-11-2016 09:57 AM
    population, rates, standardization
    • Replies: 0
    • Views: 597
    04-11-2016, 09:57 AM Go to last post
  45. I have a trouble with statistics. please help me out

    I have attached my design already. I want to know that are there any different of two birds species movement among season and session? The...

    Started by gregloki‎, 07-16-2013 03:58 AM
    • Replies: 0
    • Views: 955
    07-16-2013, 03:58 AM Go to last post
  46. Thumbs up Unweighted population vs weighted population

    Hi everyone, I have a dilemma of trying to find how to best read a data. Here is a sample of my data, the question is how frequent do you buy a...

    Started by grue‎, 09-25-2013 10:23 PM
    • Replies: 2
    • Views: 3,402
    10-10-2013, 09:56 PM Go to last post
  47. Student's T-test versus one-way ANOVA

    I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

    Started by GrungyGoose‎, 04-05-2014 10:17 PM
    anova, students t test
    • Replies: 1
    • Views: 3,065
    04-06-2014, 09:45 AM Go to last post
  48. 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: 2,686
    08-11-2011, 02:21 PM Go to last post
  49. Repeated measures design question

    Hi all, It's been a while since I've been involved with statistics and was hoping to be pointed in the right direction. I have a data set...

    Started by GStein‎, 08-19-2014 01:59 PM
    • Replies: 0
    • Views: 1,248
    08-19-2014, 01:59 PM Go to last post
  50. Literature on convergence of Bregman divergences

    Hi, as the title indicates, I am looking for some literature related to convergence properties of Bregman divergences. Generally speaking, I am...

    Started by gumbel‎, 03-17-2014 11:11 AM
    • Replies: 2
    • Views: 1,225
    03-24-2014, 05:28 AM Go to last post
  51. Stratification criteria mess up the use of a random factor?

    Hi! In my study on kelp I want to see how wave exposure and current (both continuous variables) affect kelp physical measures along the Norwegian...

    Started by Gunda‎, 12-08-2011 08:24 AM
    mixed models, nested structure, pseudoreplication, sampling design, stratified sampling
    • Replies: 0
    • Views: 1,517
    12-08-2011, 08:24 AM Go to last post
  52. 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: 1,489
    12-22-2013, 07:15 PM Go to last post
  53. Question What statistical test should I use for this data?

    Two groups (group A; group B) are given two treatments (M) and (B), and a control (Control) in different orders. Then the weight of food they consume...

    Started by gunwind‎, 12-30-2013 10:41 AM
    • Replies: 1
    • Views: 1,750
    12-30-2013, 10:46 AM Go to last post
  54. Help for Statistical Analysis for our project (using Statistical Estimation)

    Good day. I would like to ask for your help for our statistical analysis of our project. Our project is an alarm clock that is modified in a way that...

    Started by guuwey‎, 02-25-2014 06:15 AM
    • Replies: 1
    • Views: 928
    02-25-2014, 08:23 AM Go to last post
  55. Question NLP Algorithm Evaluation: Help?

    Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

    Started by gvadalkivir‎, 06-28-2010 03:01 PM
    • Replies: 0
    • Views: 2,917
    06-28-2010, 03:01 PM Go to last post
  56. Question Testing the inter-rater reliability when data doesn't have a normal distribution

    Hello guys! What is a standard way of testing the inter-rater reliability when data doesn't have a normal distribution? I had a bunch of raters...

    Started by gvadalkivir‎, 12-08-2010 10:42 PM
    • Replies: 0
    • Views: 3,537
    12-08-2010, 10:42 PM Go to last post
  57. How to describe difference of sorting sequence of values between two groups?

    I have 6 variables (A,B,C,D,E,F) in two groups named X and Y. The sorting sequence of the values of the 6 variables between the two groups is...

    Started by gyxgyb‎, 03-31-2014 09:21 AM
    • Replies: 0
    • Views: 1,714
    03-31-2014, 09:21 AM Go to last post
  58. Permutations w/ constraints question

    Hello Everyone! I apologize, in advance, if I'm posting this query in the wrong thread... My query: Given a transpose 5-d vector, {d_1, d_2,...

    Started by G_M_Vald‎, 02-05-2014 09:30 AM
    • Replies: 0
    • Views: 1,070
    02-05-2014, 09:30 AM Go to last post
  59. HI what does the alpha sign mean?

    it says, such and such variable (6 items, "alpha sign" = .88) is a measure of .......

    Started by h974483‎, 10-06-2011 01:48 AM
    • Replies: 0
    • Views: 1,957
    10-06-2011, 01:48 AM Go to last post
  60. 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: 1,801
    10-07-2011, 05:22 PM Go to last post

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