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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 03:56 AM
    • Replies: 10
    • Views: 707
    07-12-2014, 06:46 PM Go to last post
  1. Meta-analysis: different information about relationships between two variables

    Hello everyone I need help with my meta-analysis. I have collected all the studies that I wish to include and would like to take Pearson's...

    Started by Metanic‎, Today 06:39 AM
    coefficient, correlation, metaanalysis
    • Replies: 7
    • Views: 80
    Today, 08:37 AM Go to last post
  2. 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, Yesterday 09:47 PM
    • Replies: 1
    • Views: 71
    Today, 07:12 AM Go to last post
  3. Manova with within-subject and between-subject factors (no repeated measures!)

    hello, i need to do a manova with one within-subject factor (veracity) and two between-subject factors (type of speaker and type of presentation)....

    Started by thesis‎, Today 05:19 AM
    between-subject, manova, within-subject
    • Replies: 0
    • Views: 15
    Today, 05:19 AM Go to last post
  4. 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, Today 05:01 AM
    • Replies: 0
    • Views: 31
    Today, 05:01 AM Go to last post
  5. Wink Comparing overall mean rankings - help?

    Hi there, I am wondering how I can compare overall ranking means, which I have seen in a previous study. They manage to conduct a chi-square...

    Started by samohsam‎, Today 04:26 AM
    • Replies: 0
    • Views: 20
    Today, 04:26 AM Go to last post
  6. factor analysis

    Can I do a factor analysis with one dependent variable and one independent variable? Do I need to have at least two dependent variables to do a...

    Started by eunkum1‎, 07-28-2014 02:23 PM
    • Replies: 5
    • Views: 90
    Yesterday, 09:02 AM Go to last post
  7. Not sure what to do with data

    Hello, i spent a very long time gathering data and now i need to write a paper about it. Unfortunately, i'm relatively new to statistical...

    Started by soylentgreen‎, 07-28-2014 03:09 PM
    • Replies: 3
    • Views: 92
    Yesterday, 07:36 AM Go to last post
  8. Repeated Measures ANOVA and baseline control

    I’ve been asked to work on a cross-over design study for an MSc project. The study is looking at the effects of sleep deprivation on word recall....

    Started by loops22‎, Yesterday 05:40 AM
    • Replies: 4
    • Views: 89
    Yesterday, 07:15 AM Go to last post
  9. MANOVA versus t-tests : unconsistent results

    Hi, here is my problem. I am trying to compare the change on a language measure from time 1 to time 2 between 2 groups. If i do a repeated...

    Started by maxmon89‎, 07-27-2014 02:38 PM
    • Replies: 3
    • Views: 155
    Yesterday, 12:48 AM Go to last post
  10. Having a hard time deciding on what test to use for data

    Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not...

    Started by NPS‎, 07-28-2014 09:37 AM
    large sample size, mann whitney
    • Replies: 6
    • Views: 198
    07-28-2014, 02:05 PM Go to last post
  11. AR(1) Model: Are the results the same?

    Suppose we have 23 observations, with time t=1,2,...,23. The dataset has 3 variable, t (time), x (independent) and y (dependent). The dependent ...

    Started by swing‎, 07-27-2014 01:32 PM
    • Replies: 0
    • Views: 96
    07-27-2014, 01:32 PM Go to last post
  12. Question about Methodology

    Hi everyone! I'm new here, and wanted some advice on a methodology I'm using for a study of mine. Due to some confidentiality requirements, I can't...

    Started by RTUrpin‎, 07-27-2014 07:42 AM
    • Replies: 0
    • Views: 70
    07-27-2014, 07:42 AM Go to last post
  13. measure of association

    I want to explain more my problematic. I have a robot and i am clapping in order that the robot goes forward, back, left and right. The problem is...

    Started by carlajosef‎, 07-27-2014 02:05 AM
    • Replies: 0
    • Views: 48
    07-27-2014, 02:05 AM Go to last post
  14. What are some data mining techniques for analyzing cause of disease

    I have a dataset of 300 observations, of which 200 are normal, and the rest have the disease. I have the cognitive assessment scores of these 300...

    Started by randomcat‎, 07-27-2014 12:13 AM
    data analysis
    • Replies: 1
    • Views: 65
    07-27-2014, 12:31 AM Go to last post
  15. Power Analysis with limited information

    Hi all, I am trying to determine how many groups per cell I need in 8 cells. The study I'm basing the analysis on reports the number of groups per...

    Started by g2007‎, 07-26-2014 05:31 PM
    • Replies: 0
    • Views: 95
    07-26-2014, 05:31 PM Go to last post
  16. Comparing time curves for two groups in research.

    Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

    Started by bondsergey‎, 07-25-2014 08:27 AM
    statistical research
    • Replies: 3
    • Views: 118
    07-25-2014, 11:45 AM Go to last post
  17. Mediation Analysis with Categorical IV with 4 levels

    Hello all, I would like to do a mediation analysis using the following 3 variables: 1. Integration Strategy: This is the independent variable. It...

    Started by tez_s‎, 08-15-2012 07:20 AM
    dummy coding, mediation analysis, regression
    • Replies: 2
    • Views: 2,124
    07-25-2014, 06:58 AM Go to last post
  18. Post-hoc power analysis

    I have analyzed data by performing a regression model in three steps - (a) two psychological independent variables, (b) adding a political...

    Started by Vasily_Kot‎, 07-19-2014 10:09 AM
    • Replies: 2
    • Views: 158
    07-24-2014, 11:03 AM Go to last post
  19. Top AIC model with no significant parameter estimates

    Hello, I am working on a project in which my top model has normal looking standard errors, but all of the parameter estimates overlap zero,...

    Started by mikad‎, 07-23-2014 10:01 AM
    • Replies: 6
    • Views: 155
    07-24-2014, 08:23 AM Go to last post
  20. Is there a test...

    Hi there! I have a new work project and I'm finding it challenging to select the approriate test. I'm not even sure if the right test exists so...

    Started by danib‎, 07-23-2014 03:04 PM
    • Replies: 5
    • Views: 216
    07-23-2014, 10:54 PM Go to last post
  21. sample size calculation with ratings/instances nested within each subject

    Hi, As a brief background, each subject is rating all his/her activities within the day (called instances). I want to calculate the sample size...

    Started by epiboy99‎, 07-21-2014 02:00 AM
    • Replies: 0
    • Views: 89
    07-21-2014, 02:00 AM Go to last post
  22. 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: 78
    07-20-2014, 09:23 PM Go to last post
  23. Inference on the standard deviation for non-normal distributions

    Hello all, I wanted to ask how do I make inference (confidence intervals, hypothesis testing, etc...) on the the standard deviation or variance,...

    Started by NN_STAT‎, 07-20-2014 03:27 AM
    • Replies: 2
    • Views: 146
    07-20-2014, 09:44 AM Go to last post
  24. Comparison of two treatments (paired and unpaired)

    Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

    Started by atisketatasket‎, 07-19-2014 03:02 AM
    comparison, distribution, sample, survey, treatments
    • Replies: 0
    • Views: 97
    07-19-2014, 03:02 AM Go to last post
  25. Difference in difference problem.

    Hi. I want to examine the effects of a legislative amendment on limited liability companies. I am using a binary variable as my dependent...

    Started by Kristian Korbu‎, 07-18-2014 09:01 AM
    • Replies: 0
    • Views: 139
    07-18-2014, 09:01 AM Go to last post
  26. Randomized controlled trial sample size calculation

    Well I just realized this is definitely in the wrong forum can someone please delete this thread? I can't seem to find an option for that myself.. ...

    Started by efficientfuel‎, 07-16-2014 02:14 PM
    • Replies: 1
    • Views: 153
    07-17-2014, 01:17 PM Go to last post
  27. Post Which approach to use for designing my experiments (DoE)?

    Hi all and welcome to my first post. I am new to the field of DoE and did a lot of background reading. Now, I need to design a series of...

    Started by itsmi‎, 07-15-2014 12:31 PM
    design of experiments, doe
    • Replies: 2
    • Views: 143
    07-15-2014, 02:03 PM Go to last post
  28. Determining sample size in a factorial repeated measures ANOVA using GPower

    Hi all Can anybody tell me which F-test option in G power 3.1.9.2 is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

    Started by Jess@Leeds‎, 07-15-2014 11:35 AM
    factorial anova, g-power, power analysis, repeated measures anova, sample size
    • Replies: 0
    • Views: 108
    07-15-2014, 11:35 AM Go to last post
  29. Is it possible to plot pdf from moments ??

    Hi guys, I'm a mechanical engineering student and new to statistics. I'm facing a little bit of a problem with pdfs. I have used the Quadrature...

    Started by ssrivas3‎, 07-15-2014 12:51 AM
    moments, pdf
    • Replies: 1
    • Views: 117
    07-15-2014, 01:57 AM Go to last post
  30. p value for pooled data

    Hi all, In my research analysis, I've used the multiple imputation technique in SPSS to handle missing data. So far, so good. Now I'm running...

    Started by c_alderweireld‎, 07-14-2014 08:48 AM
    • Replies: 2
    • Views: 111
    07-14-2014, 10:16 AM Go to last post
  31. Confidence interval for N, based on binomial

    Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

    Started by farmer_jim‎, 07-14-2014 03:59 AM
    • Replies: 0
    • Views: 97
    07-14-2014, 03:59 AM Go to last post
  32. Correlating A with B, half of subjects has a 0 value for A. Should I exclude them?

    (sorry for the doublepost, I feel like I may have posted this in the wrong forum in the first place, feel free to move/delete the other thread; it...

    Started by nightale‎, 07-12-2014 11:02 AM
    • Replies: 4
    • Views: 170
    07-12-2014, 03:25 PM Go to last post
  33. EVIEWS 7: help required in analysis of Common Effect Model

    Dear All, I m a new user and need to know how to interpret the following output. Its urgent. please help: Dependent Variable: FDI_? ...

    Started by Maryam123‎, 07-12-2014 12:16 PM
    common effect model, eviews 7
    • Replies: 0
    • Views: 92
    07-12-2014, 12:16 PM Go to last post
  34. Determining Sample Size for Quality Audit

    I hope I am posting this to the right section, I really have no idea about statistics. I work for a healthcare company working in residential...

    Started by heathstats‎, 07-11-2014 03:01 AM
    • Replies: 0
    • Views: 111
    07-11-2014, 03:01 AM Go to last post
  35. how to calculate SD or SEM of ratios?

    I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

    Started by huimeizheng‎, 07-09-2014 01:33 AM
    • Replies: 3
    • Views: 145
    07-10-2014, 08:34 AM Go to last post
  36. 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: 184
    07-10-2014, 05:10 AM Go to last post
  37. kruskal wallis aflatoxins

    I have been analyzing aflatoxins in various nuts. The whole population contained about 130 nuts. In only 9 (5 almonds, 3 hazelnuts and 1 pistachio)...

    Started by ivn‎, 07-08-2014 12:21 PM
    • Replies: 2
    • Views: 143
    07-08-2014, 02:24 PM Go to last post
  38. Which statistical test?

    Hi I am currently writing my bachelorthesis. The subject is bankruptcy models. There are model 1, 2 en 3 that can predict a bankruptcy of a...

    Started by Isaak‎, 07-08-2014 10:07 AM
    • Replies: 0
    • Views: 115
    07-08-2014, 10:07 AM Go to last post
  39. Sample Size Calculation for Kruskal Wallis test

    Sorry if posted in wrong forum As the title says it all, how to calculate a sample size for KW test? I'm a bit of a beginner here, should we just...

    Started by Logician‎, 07-07-2014 10:20 AM
    • Replies: 3
    • Views: 157
    07-08-2014, 12:13 AM Go to last post
  40. Can you assign new observations into existing clusters?

    Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

    Started by jawon‎, 07-01-2014 04:37 PM
    • Replies: 5
    • Views: 202
    07-07-2014, 03:45 PM Go to last post
  41. Incorporating correlation between parameters using variation-covariance matrix

    Hi all, My colleagues and I are working on a project (i.e., health economics model) where we have fitted parametric curves (using Weibull,...

    Started by awchua‎, 07-07-2014 03:40 PM
    correlation, kaplan-meier, parametric curve fit, survival, variation-covariance
    • Replies: 0
    • Views: 117
    07-07-2014, 03:40 PM Go to last post
  42. selecting correct statistic

    Hello, I am wondering if I need to determine a statistic to say that each measured variable is significantly different from each other. The value...

    Started by lweinbrecht‎, 07-06-2014 05:50 PM
    • Replies: 0
    • Views: 148
    07-06-2014, 05:50 PM Go to last post
  43. Comparing 2 groups of means ! shoud I use letters ?

    Hello, I hope everyone is doing well ! when comparing groups of means in a table, usually we express the differences in terms of letters next to...

    Started by expressomar‎, 07-06-2014 10:15 AM
    letters, means, probability
    • Replies: 0
    • Views: 131
    07-06-2014, 10:15 AM Go to last post
  44. Nonparametric statistical significance test for largely skewed count data

    My research design looks as follows: an experimental game with 4 participants (human subjects), repeated for 20 rounds. During each round,...

    Started by ardelia‎, 07-04-2014 06:12 AM
    • Replies: 3
    • Views: 187
    07-04-2014, 08:03 AM Go to last post
  45. Performing a Simple Network Analysis

    Hi, I have recently been trying to carry out network analysis to study the community structure of bacteria (OTUs) within the gut of mice. I have...

    Started by KezOmalley‎, 07-04-2014 03:51 AM
    • Replies: 0
    • Views: 104
    07-04-2014, 03:51 AM Go to last post
  46. Should I substract the mean before cross-correlation in a particular case or not?

    Hello, I have a question about the cross-correlation. I have 2 data sets, one is binned and another is not, 9000 values every. Something like this:...

    Started by ValeryVS‎, 07-01-2014 05:19 AM
    biased, cross-correlation, cross-covariance, matlab, unbiased
    • Replies: 0
    • Views: 99
    07-01-2014, 05:19 AM Go to last post
  47. 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: 345
    06-30-2014, 06:25 PM Go to last post
  48. Post Urgent need of help!!!

    Hi, I did an online cross-sectional self-questionnaire for male participants only and I am stuck on what method to use when analyzing the data. ...

    Started by odomaa1‎, 06-30-2014 07:58 AM
    analysis help, analysis method, analysis problem, statistical design
    • Replies: 0
    • Views: 132
    06-30-2014, 07:58 AM Go to last post
  49. Polychoric Principal Component Analysis

    Hi everyone: I am working with a questionnaire to evaluate socioeconomic position in a sample. It was basically counting a list of items to assess...

    Started by JavierM88‎, 06-23-2014 12:08 PM
    2 Pages
    1 2
    pca, polychoric
    • Replies: 19
    • Views: 648
    06-27-2014, 01:30 PM Go to last post
  50. Can I used a mixed anova for this case?

    I have a study with 1 between-subjects IV (2 levels) and 1 repeated measures IV (3 levels). I am only interested in the between subject main effect...

    Started by rsm‎, 06-26-2014 07:24 AM
    • Replies: 0
    • Views: 145
    06-26-2014, 07:24 AM Go to last post
  51. Need help with Multiple Imputations ("pooled" dataset)

    Hello everybody, My original data set (n=901) contains missing values (10-20% per variable). I am applying Multiple Imputations technique using...

    Started by kiton‎, 06-20-2014 11:39 AM
    • Replies: 8
    • Views: 353
    06-23-2014, 02:07 PM Go to last post
  52. Compute an optimization stress from size distribution density and abundance

    Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

    Started by Iago-lito‎, 06-23-2014 04:56 AM
    abundance, distribution density, optimization, simulation, stress
    • Replies: 0
    • Views: 213
    06-23-2014, 04:56 AM Go to last post
  53. Bayes statistics - sensitivity to priors

    Hi, I came across a statement in a review of a research field, where they were determining an unknown parameter using Bayesian statistics. The...

    Started by rogojel‎, 06-19-2014 06:51 AM
    bayes, prior probabilities, sensitivity
    • Replies: 5
    • Views: 287
    06-22-2014, 01:53 AM Go to last post
  54. reference for representation of linear functionals of random variables

    I'm looking for a representation theorem for linear functionals of random variables. I'm not sure if Riesz–Markov–Kakutani does it, but it seems...

    Started by jamajor‎, 06-18-2014 01:43 PM
    functionals, random variables, riesz representation
    • Replies: 1
    • Views: 180
    06-21-2014, 09:09 PM Go to last post
  55. Have population, use inferential stats? Non-normal dependent variable, what to do?

    Statistics people! I have two questions for you. I am NOT a statistician so please be nice and answer simply :) Background: We are looking at...

    Started by alea iacta est‎, 06-19-2014 05:22 PM
    inferential statistics, interaction, logistic regression, normal distribution, population
    • Replies: 1
    • Views: 272
    06-20-2014, 09:07 PM Go to last post
  56. how to analyse samples with different distribution?

    I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

    Started by jaisysamuel‎, 06-15-2014 04:31 AM
    • Replies: 3
    • Views: 236
    06-20-2014, 07:33 PM Go to last post
  57. Performance of CSIs at Crime Scenes

    Hi, Im after some advice, which i would really appreciate assistance with. At our police force the CSIs are being performance tested by use of...

    Started by musclebeach‎, 06-12-2014 07:26 PM
    • Replies: 3
    • Views: 312
    06-19-2014, 06:27 AM Go to last post
  58. Unbalanced sample - which test do I use?

    I have two samples - group 1 has 26 participants / group 2 has 44 participants I was planning to use a two-way anova to analyze various aspects of...

    Started by jtedford‎, 06-17-2014 12:42 PM
    • Replies: 4
    • Views: 276
    06-17-2014, 01:16 PM Go to last post
  59. Interaction or moderation effect - suitable method for analysis?

    I have run a two-way between groups ANOVA to analyse my data. However, I have one more variable, which is not one of the factors in the ANOVA. I want...

    Started by Stefan Stefanov‎, 06-15-2014 07:03 AM
    interaction, interaction effect, moderation, spss
    • Replies: 3
    • Views: 214
    06-17-2014, 08:16 AM Go to last post
  60. How to analyze a variable measured on a Likert scale and its interaction with another

    0 down vote favorite I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "likert scale" measures "brand...

    Started by Stefan Stefanov‎, 06-17-2014 07:30 AM
    interaction, interaction effect, method, spss
    • Replies: 0
    • Views: 121
    06-17-2014, 07:30 AM Go to last post

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