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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: 18,712
    10-11-2014, 12:02 PM Go to last post
  1. Compute a new variable or is there a better way to do this?

    First post, thanks in advance for advice. I would like to examine three variables, with the expectation that: When a subject scores HIGH on...

    Started by vexedpsych‎, 03-26-2013 03:25 PM
    • Replies: 2
    • Views: 1,605
    03-26-2013, 04:07 PM Go to last post
  2. Basic Statistics Question

    I have a distribution and the numbers are spread around all over the place. For one sample of data it looks like left skewed and for other right...

    Started by sak‎, 10-08-2012 07:56 PM
    • Replies: 2
    • Views: 2,389
    10-08-2012, 08:29 PM Go to last post
  3. Bayesian vs. Frequentist for the applied researcher

    There's been a lot of talk about Bayes lately in my life, talkstats, class, articles etc. I feel like it's becoming something researchers can't hide...

    Started by trinker‎, 11-25-2012 07:57 PM
    bayes
    • Replies: 2
    • Views: 1,780
    11-26-2012, 07:30 PM Go to last post
  4. Underestimation of test scores due to item size

    Hello all, I've just been playing with the following idea, and I don't really have anyone else to talk about this kind of thing with. Anyway, I...

    Started by Rhodo‎, 10-02-2012 11:36 AM
    • Replies: 2
    • Views: 1,610
    10-02-2012, 02:15 PM Go to last post
  5. Revised Inventory Reliability and Validity

    I sent a current inventory survey to 1500 people. They were given the option of evaluating each inventory item with a "retain" "revise" or "remove"...

    Started by paschif‎, 10-05-2012 09:45 AM
    • Replies: 2
    • Views: 1,423
    10-05-2012, 10:41 AM Go to last post
  6. Split Survey Design

    I will appreciate any advise/critique. The problem is as follows: I have 21 objects which define a context. For each object, I would like to...

    Started by statpuzz‎, 10-22-2012 03:08 PM
    • Replies: 2
    • Views: 1,131
    10-22-2012, 04:03 PM Go to last post
  7. Appropriateness of logistic regression

    Hello, I am interested in the effects of gender on a set of variables. I have run a number of group mean t tests (with gender as the group...

    Started by jesse‎, 10-24-2012 07:14 AM
    dummy variable, logistic regression
    • Replies: 2
    • Views: 2,252
    10-24-2012, 08:04 AM Go to last post
  8. Choosing Kruskal–Wallis test for group comparison with unequal sizes

    I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

    Started by btomatoe‎, 10-31-2012 01:14 AM
    • Replies: 2
    • Views: 28,063
    10-31-2012, 08:10 PM Go to last post
  9. mixture of normals inequality

    Let C be a convex and compact set in R^n, and let T = {theta_1,...,theta_k} be a set of points not in C such that T and C are hyperplane separated. ...

    Started by student?‎, 10-16-2012 07:25 PM
    • Replies: 2
    • Views: 1,295
    10-19-2012, 06:20 PM Go to last post
  10. How to create sampling weights?

    Hi all, I'll go directly to the point, and then try to clarify: How do I create reliable weights for a sample, that take account of the number...

    Started by Olleolle‎, 10-23-2012 04:01 AM
    • Replies: 2
    • Views: 2,578
    10-23-2012, 09:21 AM Go to last post
  11. Question Help With The Preffered Package Type Assessment

    Hello there to everyone! I have the question concerning the underlying data analysis methodology. Here is the small introduction. There is a data...

    Started by antivanov‎, 11-12-2012 05:11 PM
    cluster analysis, data analysis, methodology, regession
    • Replies: 2
    • Views: 1,389
    11-15-2012, 12:45 PM Go to last post
  12. Help with real estate statistics.

    I am a real estate appraiser in California. I want to conduct a study that will tell me what certain aspects of properties, like bedrooms, square...

    Started by ablackburn‎, 11-11-2012 11:28 AM
    home, real estate, statisics
    • Replies: 2
    • Views: 1,322
    11-11-2012, 03:25 PM Go to last post
  13. Calculating weighted mean & SD from multiple group data

    I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

    Started by asf‎, 11-19-2012 08:50 PM
    • Replies: 2
    • Views: 4,763
    11-21-2012, 07:47 PM Go to last post
  14. Sample Size - Mathematical proof

    Hi, I am currently trying to find out the mathematical proof for my chosen sample size. I have referred to the table below and found out that my...

    Started by jpv90‎, 12-06-2012 09:16 AM
    • Replies: 2
    • Views: 3,107
    12-21-2012, 11:53 AM Go to last post
  15. 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: 2,375
    05-04-2013, 05:22 AM Go to last post
  16. Help Calculating Significance Between 5 Elementary School Data

    Hello, I am a school administrator in Oklahoma. I have five small elementary schools in my district. I often here from each of them that their...

    Started by rdarr‎, 12-08-2012 09:54 AM
    • Replies: 2
    • Views: 1,424
    12-11-2012, 08:46 AM Go to last post
  17. which type of ANOVA?

    N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in...

    Started by Lolali‎, 12-18-2012 08:21 PM
    anova, factorial anova, nested anova, program r, repeated measures anova
    • Replies: 2
    • Views: 1,827
    12-19-2012, 07:35 AM Go to last post
  18. Zero Inflated LOGISTIC Regression?

    Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

    Started by lancearmstrong1313‎, 12-19-2012 07:34 AM
    • Replies: 2
    • Views: 10,056
    12-19-2012, 09:09 AM Go to last post
  19. What statistical test should I use?

    I've recently collected data as part of my university course to answer the question 'Does social structure in captive meerkats affect behaviour and...

    Started by tuppyl2‎, 05-16-2013 04:17 AM
    • Replies: 2
    • Views: 1,468
    05-16-2013, 08:17 AM Go to last post
  20. residual analysis where expected values are <5

    Hi all, My question is: Will it be fine if we use residual analysis, (observed-expected)/sqrt(expected), to test the pattern of association...

    Started by nikkinath‎, 04-26-2013 07:57 AM
    • Replies: 2
    • Views: 1,185
    04-29-2013, 03:53 AM Go to last post
  21. Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

    Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

    Started by blubblub‎, 04-18-2013 06:16 AM
    kruskal-wallis, nominal-ordinal, nonparametric
    • Replies: 2
    • Views: 1,909
    04-18-2013, 05:20 PM Go to last post
  22. Cluster analysis - using statistiXL package for excel - how to determine a cluster

    Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

    Started by frans‎, 03-29-2013 09:42 AM
    cluster analysis, statistical test
    • Replies: 2
    • Views: 2,116
    04-08-2013, 06:33 PM Go to last post
  23. Mediation Analysis

    Hi All, Could any one explain for me what is the exact differences between full Mediation and partial Mediation? With some example please. Many...

    Started by ghada8888‎, 04-03-2013 09:22 AM
    • Replies: 2
    • Views: 1,417
    04-03-2013, 11:38 AM Go to last post
  24. Assumption of variables for Factor Analysis

    Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

    Started by Fred_a‎, 01-13-2013 01:05 PM
    factor analysis, random variables
    • Replies: 2
    • Views: 1,389
    01-13-2013, 03:04 PM Go to last post
  25. Which test to use please?

    Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

    Started by AthenaAnkou‎, 03-19-2013 08:35 AM
    • Replies: 2
    • Views: 2,858
    03-19-2013, 12:48 PM Go to last post
  26. 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: 3,137
    01-29-2013, 03:18 PM Go to last post
  27. MANOVA: IV with only two levels

    Hi, I'm a biological science university student with an interest in teaching myself some basic inferential statistic and have been learning about...

    Started by hrj21‎, 03-13-2013 04:41 AM
    • Replies: 2
    • Views: 1,628
    03-14-2013, 06:48 AM Go to last post
  28. Scientific articles about statistics

    I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

    Started by Englund‎, 03-14-2013 03:28 PM
    • Replies: 2
    • Views: 2,749
    03-14-2013, 03:49 PM Go to last post
  29. Repeatability and Reproducibility

    Hi, I'm new to this and I'm not exactly a math expert. I am carrying out research in a lab, and I want to test repeatability and reproducibility of...

    Started by Newbe123‎, 02-20-2013 05:17 AM
    repeatability
    • Replies: 2
    • Views: 2,725
    02-21-2013, 10:25 AM Go to last post
  30. Need help to understand which statistical test to use on my data.

    Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

    Started by bertomaycry‎, 04-25-2013 01:51 PM
    • Replies: 2
    • Views: 2,521
    04-25-2013, 03:25 PM Go to last post
  31. How to deal with a categorical response and continuous and categorical predictors?

    Hi all, I have a large dataset of categorical and continuous variables, the observations are animal species. I want to test which variables are more...

    Started by Oritteropus‎, 12-29-2012 12:35 PM
    categorical variables, classification-tree, discriminant analisys, phylogenetic signal, random forest
    • Replies: 2
    • Views: 2,168
    01-02-2013, 02:23 AM Go to last post
  32. Alternative to Pearson's Chi-Square Goodness of fit test, when expected counts < 5

    Hi there, In a part of my research, I am fitting probability distribution models for the count data(and binomial data) using Poisson, Binomial,...

    Started by arun‎, 03-29-2013 01:55 AM
    • Replies: 2
    • Views: 1,549
    04-21-2013, 08:08 AM Go to last post
  33. Fixed and Random Effects in Mixed Modeling

    Thank ahead of time for any help. I am analyzing time series data. Originally I was running Repeated Measures ANOVA and entering between subjects...

    Started by John.kostek‎, 01-23-2013 03:25 PM
    fixed effects, mixed modeling, random effects
    • Replies: 2
    • Views: 1,955
    02-01-2013, 07:40 AM Go to last post
  34. how to determine what test to use for a project?

    I'm trying to determine if there is a statistical significance in hospital admission rates (asthma and bronchitis) before and after tobacco...

    Started by chavalo‎, 03-15-2013 02:18 PM
    analysis, help please, models, statistical
    • Replies: 2
    • Views: 1,163
    03-15-2013, 02:42 PM Go to last post
  35. What is the purpose of multigroup invariance test?

    Hi, I am confused about the purpose of multigroup test. According to Byrne (2008), many studies focus on multigroup comparisons, and assume two...

    Started by Hosam‎, 03-10-2013 10:48 AM
    • Replies: 2
    • Views: 1,941
    03-10-2013, 08:52 PM Go to last post
  36. No idea what tests to use!

    ** (P) (c) (f) (s) 3A 1 0 1 0 3B 1 1 1 1 ...

    Started by monkeyspearfish‎, 03-14-2013 08:57 AM
    • Replies: 2
    • Views: 2,248
    03-14-2013, 11:45 AM Go to last post
  37. discriminant linear analysis, coefficient interpretation

    Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

    Started by parsec2011‎, 03-17-2013 09:57 PM
    • Replies: 2
    • Views: 19,250
    03-19-2013, 02:47 PM Go to last post
  38. Question basic hypothesis testing

    am new to the forum, and would appreciate some help. i'm studying the relationship between worker performance (x) and pay (y) i'm trying to...

    Started by rcreat‎, 03-17-2013 11:43 AM
    • Replies: 2
    • Views: 1,435
    03-17-2013, 01:49 PM Go to last post
  39. Goodness of Fit Applicability

    I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

    Started by Archoplites‎, 02-13-2013 02:49 PM
    • Replies: 2
    • Views: 1,229
    02-13-2013, 05:09 PM Go to last post
  40. Dimensionalities in Multi-Dimensional Scaling

    Hello all, :wave: I'm conducting market research and want to use compositional Multi-dimensional scaling to create perceptual maps of Brand...

    Started by JessieB‎, 03-11-2013 08:16 AM
    multi-dimensioanl scaling
    • Replies: 2
    • Views: 1,776
    03-14-2013, 12:49 AM Go to last post
  41. P-value plots

    If anyone know any good paper or other resource that gives an introduction to p-value plots, I'd greatly appreciate if you could share it.

    Started by Englund‎, 04-24-2013 07:05 PM
    • Replies: 2
    • Views: 1,560
    04-25-2013, 01:51 AM Go to last post
  42. Please help with my statistical query

    So I am comparing 2 imaging techniques and correlating their results for calculating bone mineral density in the knees. One is called DEXA which is a...

    Started by apoorvprasad‎, 04-17-2013 06:55 AM
    • Replies: 2
    • Views: 1,199
    04-17-2013, 05:13 PM Go to last post
  43. Where to send an education methods piece

    I'm writing a piece that introduces a new correlation like measure between time periods. I would like to get this one published somewhere. The...

    Started by trinker‎, 05-17-2013 09:54 AM
    education, educational measurement, journal, research
    • Replies: 2
    • Views: 1,164
    05-18-2013, 02:20 AM Go to last post
  44. help with pilot study

    My IVS: I manipulated race of a job candidate (black or white) as well as the job candidate’s SES (Low SES or High SES) I then gave a survey...

    Started by norajones‎, 04-03-2013 11:44 AM
    • Replies: 2
    • Views: 1,343
    04-10-2013, 10:20 PM Go to last post
  45. Survival Analysis

    Hello i have a group of varaibles which represent 251 variables express the GPA of the student(averages) througout 41 semester...what kind of...

    Started by osamahamza‎, 03-12-2013 04:25 AM
    • Replies: 2
    • Views: 2,085
    03-13-2013, 02:19 PM Go to last post
  46. how to using mann kendall test?

    hi everyone, i am a new member of this forum and i'm not statistician. my english is not good, sorry for language. i'm having trouble with the...

    Started by silvi_math55@yahoo.co.id‎, 05-18-2013 07:37 AM
    • Replies: 2
    • Views: 5,674
    05-20-2013, 06:14 AM Go to last post
  47. Best Statistical Test for small sample size

    I am looking at changes in endotracheal tube cuff pressures pre and post subglottic suctioning. I have pre and post data for four different initial...

    Started by mrobert6‎, 05-28-2013 12:07 PM
    pre and post
    • Replies: 2
    • Views: 1,802
    06-26-2013, 09:11 AM Go to last post
  48. Quantifi the homogeneity

    Hello i am hydrologe and i search to find a solution for the following problem: Suppose that i have k samples of observations (region) of the...

    Started by Hussein‎, 05-28-2013 01:24 PM
    homogeneity
    • Replies: 2
    • Views: 1,409
    05-30-2013, 09:33 AM Go to last post
  49. What approach to take for this study

    Hi I need help in finding a what stat approach i need to use I have two groups a G1(disease) and control - 5 people in each group. For both...

    Started by jongseuk‎, 06-11-2013 10:21 AM
    • Replies: 2
    • Views: 1,418
    06-11-2013, 02:10 PM Go to last post
  50. 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: 1,105
    06-19-2013, 07:58 PM Go to last post
  51. Gamma vs. Tau's b

    Hi everyone I am studying political science, and we have during our classes of statistical research learned to use gamma for ordinal variables....

    Started by Frederik Gørtz‎, 06-12-2013 12:19 PM
    gamma, kendall, tau
    • Replies: 2
    • Views: 1,549
    06-15-2013, 05:13 AM Go to last post
  52. Suggestions for book

    Hi everyone! I am a new user of this forum. I have a degree in Mathematics and I would like to improve my knoweledge in Statistics. In particular...

    Started by Leika‎, 06-14-2013 09:04 AM
    • Replies: 2
    • Views: 1,609
    06-14-2013, 10:15 AM Go to last post
  53. sampling question

    Hello, I am about to design a study to compare two measures of "civic engagement" in two nations. Unfortunately, I don't have the possibility to...

    Started by parsec2011‎, 06-19-2013 04:48 PM
    • Replies: 2
    • Views: 1,166
    06-22-2013, 07:51 AM Go to last post
  54. What test to use?

    I'm glad I found this group. I'm currently studying on butterfly's garden preferences based on the number of butterflies caught in the area. I...

    Started by jjd‎, 06-20-2013 09:36 AM
    • Replies: 2
    • Views: 1,144
    06-20-2013, 12:04 PM Go to last post
  55. 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: 5,534
    06-23-2013, 03:16 AM Go to last post
  56. 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: 3,195
    06-27-2013, 03:41 PM Go to last post
  57. Mann-Whitney U failed assumption?

    Hi all, I hope you're able to help. I have some numbers that need crunching. I would normally use an independent-samples t test, however, as...

    Started by stephenstats‎, 07-24-2013 12:56 PM
    • Replies: 2
    • Views: 948
    07-24-2013, 02:50 PM Go to last post
  58. As treated vs. per protocol?

    I have found articles saying the two are similar and cant make sense of it. Could anyone give me exact explanations of the two in lay terms and also...

    Started by Matt1147‎, 06-25-2013 03:21 PM
    • Replies: 2
    • Views: 3,967
    06-26-2013, 08:26 AM Go to last post
  59. t-test

    The inpatients infection rates will be tracked from the entire inpatient population on all three adult units allowing it to be compared to the rates...

    Started by eunkum‎, 07-19-2013 10:53 AM
    • Replies: 2
    • Views: 1,299
    07-19-2013, 03:56 PM Go to last post
  60. Unhappy How they obtained the following results

    I need a little help, I just starting with statistics and I'm trying to figure out how the calculated result is 11.8532? Hypothesis H1 was: "There...

    Started by markecb‎, 07-30-2013 12:19 PM
    • Replies: 2
    • Views: 1,475
    07-30-2013, 02:31 PM Go to last post

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