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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: 18,625
    10-11-2014, 12:02 PM Go to last post
  1. How to test this mix of continuous and categorical data?

    Hello all. I'm working on this project and have the following variables: x (categorical, independent) y (continuous,independent) z...

    Started by KevinP‎, 07-02-2013 08:02 PM
    • Replies: 5
    • Views: 1,146
    07-02-2013, 08:56 PM Go to last post
  2. Mokken Scaling

    I have to understand the effect of varying levels of ICT adoption at firm level. I have been suggested to use mokken scaling but I have no idea how...

    Started by Sadaf.B‎, 07-01-2013 06:49 AM
    mokken scale
    • Replies: 0
    • Views: 1,178
    07-01-2013, 06:49 AM Go to last post
  3. Kendall's Tau with average values of ranked variables

    Hi, I have a set of 11 variables with a frequency ranking scale of "never" (1) to "always" (5) + "not applicable". Each variable is a normal step...

    Started by talyenn‎, 06-25-2013 03:43 AM
    • Replies: 3
    • Views: 1,346
    06-30-2013, 07:23 AM Go to last post
  4. Suggested Forecasting Techniques and execution

    I am doing a research on accident rates (count in relation to total worked hours) in a company and I have the rates for the last 7 years. Each month,...

    Started by geo_11‎, 06-29-2013 01:29 AM
    • Replies: 0
    • Views: 1,416
    06-29-2013, 01:29 AM Go to last post
  5. 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: 3,174
    06-27-2013, 03:41 PM Go to last post
  6. Comparing ROC curves

    Do you have to have the raw data a ROC curve is generated from to tell if they are signficantly different, or can you use the results such as the C...

    Started by noetsi‎, 06-26-2013 01:51 PM
    • Replies: 0
    • Views: 1,654
    06-26-2013, 01:51 PM Go to last post
  7. Are these group paired or unpaired?

    I’m a med student who hasn’t had any form of math in the past 4 years, so bare with me. 90 % of words on this site dont mean anything to me, so it...

    Started by User‎, 06-26-2013 12:40 PM
    • Replies: 0
    • Views: 1,210
    06-26-2013, 12:40 PM Go to last post
  8. Article on logistic regression - don't understand logic of statement.

    The author Menard, has written a good deal on this topic and this is from a recent (2011) journal article. This makes sense. But I don't...

    Started by noetsi‎, 06-25-2013 01:54 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,480
    06-26-2013, 11:44 AM Go to last post
  9. 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: 1,790
    06-26-2013, 09:11 AM Go to last post
  10. 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: 3,945
    06-26-2013, 08:26 AM Go to last post
  11. how to calculate the propagated error

    Hello, I have difficulties in calcuating the propagated error of my variable x and was hoping that someone knows. My variable x is calculated...

    Started by Hedwig‎, 06-26-2013 08:09 AM
    • Replies: 0
    • Views: 492
    06-26-2013, 08:09 AM Go to last post
  12. Finding Relationships with Crosstab Data

    first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

    Started by ccooper‎, 06-25-2013 02:04 PM
    • Replies: 4
    • Views: 2,076
    06-25-2013, 04:52 PM Go to last post
  13. How to compare multiple testers wine ratings?

    Newbie alert! Problem description: I have 20 wines and 6 tasters. Each taster ranks the wines from 1 to 20. Question: How do I test the...

    Started by achalk‎, 06-24-2013 07:05 PM
    ranks
    • Replies: 8
    • Views: 1,450
    06-25-2013, 07:48 AM Go to last post
  14. Augment a sample to improve goodness-of-fit

    Hi all, Lets say I have a sample from a normal (or any other) distribution, and the goodness-of-fit is reasonable. It is possible to improve this...

    Started by alextb‎, 06-24-2013 05:05 AM
    goodness-of-fit
    • Replies: 0
    • Views: 1,416
    06-24-2013, 05:05 AM Go to last post
  15. Little's MCAR test: mismatch in DF

    Hi, I have a question concerning degree of freedom in little ’s MCAR test. There seems to be a mismatch in the degree of freedom in the results of...

    Started by Patrick@RU‎, 06-23-2013 10:01 AM
    little’ s mcar test, missing data
    • Replies: 0
    • Views: 3,653
    06-23-2013, 10:01 AM Go to last post
  16. testing for variance?

    Hi, I would like to do a test to compare the variance of some data with that of fixed variance (or compare the variance of two samples). I know...

    Started by sunnydown‎, 06-23-2013 04:00 AM
    • Replies: 1
    • Views: 1,118
    06-23-2013, 05:33 AM Go to last post
  17. 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: 5,506
    06-23-2013, 03:16 AM Go to last post
  18. 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: 1,159
    06-22-2013, 07:51 AM Go to last post
  19. Analysis Likert Data and Comparing 2 Groups

    I have 2 groups of people. There are 75 people in each group. Each group was given the same set of 7 Likert items. I want to compare the results...

    Started by nigellscott‎, 05-30-2013 08:27 AM
    likert items
    • Replies: 7
    • Views: 2,525
    06-22-2013, 06:04 AM Go to last post
  20. Talking Which test to use?

    Thanks in advance for reading my post. I have a year's worth data that describes the frequency of patient falls organized by the attending...

    Started by jaimeiam‎, 06-19-2013 07:14 PM
    significant difference, standard deviation, statistical tests, variance
    • Replies: 4
    • Views: 1,252
    06-21-2013, 02:07 AM Go to last post
  21. abnormal data, log transform data, still abnormal, what to do?

    Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

    Started by cherries‎, 12-07-2012 11:56 AM
    • Replies: 6
    • Views: 2,530
    06-20-2013, 02:19 PM Go to last post
  22. 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: 1,136
    06-20-2013, 12:04 PM Go to last post
  23. 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: 1,096
    06-19-2013, 07:58 PM Go to last post
  24. Which test to use?

    Hey following problem: I have a binary variable stating that either condition 0 or condition 1 was shown to the participant. Next to that I have...

    Started by Lewh‎, 06-19-2013 03:27 AM
    • Replies: 1
    • Views: 1,112
    06-19-2013, 09:06 AM Go to last post
  25. Post Am I applying this Chi-squared test correctly?

    Hi everyone! I am a history grad student and I am trying to use some statistics in one of my papers. I am working with a certain (ancient) text...

    Started by badslacker‎, 06-15-2013 08:26 PM
    • Replies: 4
    • Views: 1,756
    06-16-2013, 08:53 PM Go to last post
  26. test of equality of covariance (or correlations) among DISCRETE variables?

    i have been trying to find significance tests whose null hypothesis is that the non-redundant, off-diagonal elements of a covariance (or correlation)...

    Started by spunky‎, 06-15-2013 08:25 PM
    • Replies: 3
    • Views: 1,497
    06-16-2013, 04:55 PM Go to last post
  27. multivariate logistic regression

    I want to do multivariate logistic regression. Does it mean "one logistic regression with 2 dependent variables at the same time? Or Does it mean...

    Started by eunkum‎, 04-18-2013 12:02 PM
    • Replies: 5
    • Views: 3,238
    06-16-2013, 01:46 PM Go to last post
  28. True mean and the Central Limit Theorem

    I've learned some pretty remarkable things about the Central Limit Theorem and the so-called Sampling Distribution of the Sample Mean. But there's...

    Started by aut0pilot101‎, 06-15-2013 03:56 PM
    • Replies: 3
    • Views: 1,309
    06-15-2013, 04:21 PM Go to last post
  29. Red face Discrete choice experiment - correlation between attributes

    Hi all, am new to this site, so please excuse if I have posted incorrectly. Basically I have designed a discrete choice experiment (DCE)examining the...

    Started by shellbridge‎, 06-15-2013 02:05 PM
    discrete choice
    • Replies: 0
    • Views: 1,376
    06-15-2013, 02:05 PM Go to last post
  30. Question comparison for 2 independent groups , t test or ANOVA

    What test should i use for a comparison between two independent groups of N=30. Also if a questionnaire is made with only 2 answers like yes or no...

    Started by shesaishi‎, 06-14-2013 04:28 PM
    anova, comparison, t test
    • Replies: 7
    • Views: 2,505
    06-15-2013, 07:47 AM Go to last post
  31. 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: 1,534
    06-15-2013, 05:13 AM Go to last post
  32. 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: 1,576
    06-14-2013, 10:15 AM Go to last post
  33. Rank correlation - Comparing multiple sets of ranked metric values

    Rank correlation - Comparing multiple sets of ranked metric values First, I would like to thank the mods and experts who maintain and answer...

    Started by JKru‎, 06-13-2013 02:06 PM
    correlation, kruskal-wallis, rank correlation, rankings
    • Replies: 0
    • Views: 2,178
    06-13-2013, 02:06 PM Go to last post
  34. Segmentation: to weight data or not?

    I am trying to find out whether to weight data when running the segmentation analysis. We will be using several techniques in our approach including...

    Started by KatieS‎, 06-13-2013 02:05 PM
    • Replies: 0
    • Views: 962
    06-13-2013, 02:05 PM Go to last post
  35. 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: 1,187
    06-13-2013, 09:26 AM Go to last post
  36. Binary Variable Split

    Hey everybody, Following problem: I did research and collected 207 responses. One of the results of the survey is a binary variable. Lets call the...

    Started by Lewh‎, 06-13-2013 09:19 AM
    • Replies: 0
    • Views: 1,075
    06-13-2013, 09:19 AM Go to last post
  37. Estimating likelihood of normal distribution mean shift after N samples

    First off, sorry if this post is in the wrong place. Please feel free to point me to the right place to post. The scenario is as follows: I have...

    Started by aut0pilot101‎, 06-11-2013 10:12 PM
    • Replies: 6
    • Views: 2,445
    06-12-2013, 10:39 AM Go to last post
  38. 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: 1,406
    06-11-2013, 02:10 PM Go to last post
  39. Mediation Analysis

    Hi All, Could any one explain to me the idea around the correlation in the Mediation Analysis (MA)? I have conductedA the Bootstrapping analysis...

    Started by ghada8888‎, 06-09-2013 01:49 AM
    • Replies: 0
    • Views: 1,310
    06-09-2013, 01:49 AM Go to last post
  40. Ecological statistics - comparison across three years

    Hello all, I have a rather large data set to analyze, and I would appreciate some guidance. For this dataset, 80 plots were sampled for dead tree...

    Started by Mu10‎, 06-03-2013 06:29 PM
    • Replies: 4
    • Views: 1,767
    06-08-2013, 04:38 PM Go to last post
  41. Interpreting the "Rotated component matrix" in Varimax Factor Analysis

    So I did Varimax factor analysis for 21 questions in order to group them. As per my understanding the rotated component matrix places each question...

    Started by Susan83‎, 06-06-2013 11:18 PM
    factor analysis
    • Replies: 4
    • Views: 19,076
    06-07-2013, 05:14 PM Go to last post
  42. Microfinance Data, Mean analysis

    Hi, I have this large set of data from many firms (microfinance institutions). The data is across many years 1996-2011 and firms come and go and...

    Started by julius‎, 04-04-2013 01:20 PM
    • Replies: 1
    • Views: 1,383
    06-06-2013, 09:02 AM Go to last post
  43. Z-scores with non-normal data

    Hi, I am reviewing someone's study in which they used z-scores to standardize and compare data. I see no mention of their test for normality and...

    Started by budgie81‎, 06-06-2013 07:35 AM
    normal distribution, transformation, z score
    • Replies: 1
    • Views: 5,134
    06-06-2013, 07:46 AM Go to last post
  44. What should I use if I want respondent regression coefficients to predict the group?

    I have 3 hundred rows of data. Each row represents a unique person. I have a total of 38 columns of data where column 1 is the person, columns 2-37...

    Started by ShmelkDog‎, 06-05-2013 02:25 PM
    • Replies: 0
    • Views: 998
    06-05-2013, 02:25 PM Go to last post
  45. Help with choosing right statisical method.

    Hi I am new at statistic and am writing my bachelor thesis. I am not really sure how to interpret the statistical significance of my final...

    Started by metlou‎, 05-29-2013 06:39 AM
    elisa
    • Replies: 3
    • Views: 1,452
    06-03-2013, 12:29 PM Go to last post
  46. von Neumann test for trend analysis

    Hi! Recently, I’ve come across von Neumann test for trend detection. I cannot find whether it has any particular assumptions – any info (as well...

    Started by mcdomell‎, 06-03-2013 05:49 AM
    trend analysis, trend detection, von neumann test
    • Replies: 0
    • Views: 2,975
    06-03-2013, 05:49 AM Go to last post
  47. Writing equations for latent growth curve models

    Hi all, I'm a PhD student currently working on an independent research project using latent growth curve modeling. This is my first time using...

    Started by omnibus‎, 05-31-2013 02:01 PM
    equation query, latent growth curve, longitudinal data, parallel process model
    • Replies: 5
    • Views: 2,080
    06-01-2013, 02:11 PM Go to last post
  48. Generating a multi-parameter space and sampling from it

    Hi all, I have a long list of combination of parameters which covary. I would like to sample from it but not exactly the same values. What I'd like...

    Started by Oritteropus‎, 06-01-2013 11:49 AM
    covariation, parameter space, sampling
    • Replies: 0
    • Views: 1,251
    06-01-2013, 11:49 AM Go to last post
  49. Significant lack of fit, invalid model?

    I am using JMP and working with percent arrival of insects (scale of 0-1). For example, out of 10 insects, 10 arrived at date X so 0.1 is that...

    Started by jhartsho‎, 05-30-2013 11:34 AM
    insects
    • Replies: 7
    • Views: 4,322
    05-30-2013, 03:20 PM Go to last post
  50. Comparing model fits across groups

    Hi all, I have an experiment involving two groups of individuals who receive different treatments, and there are two non-linear models I wish to...

    Started by timothyv‎, 05-30-2013 03:19 PM
    • Replies: 0
    • Views: 1,195
    05-30-2013, 03:19 PM Go to last post
  51. 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: 1,398
    05-30-2013, 09:33 AM Go to last post
  52. Question accounting for volunteers giving a survey

    When writing about validity/ reliability, how do I take into account volunteers who have given the treatment to the participants rather than myself...

    Started by watasnake‎, 05-29-2013 07:36 PM
    reliability, validity, volunteers
    • Replies: 0
    • Views: 990
    05-29-2013, 07:36 PM Go to last post
  53. [SOLVED] Recommendation: Journals that may have survey research

    Hopefully the title says it all. I'm trying to get more familiar with survey research (how it's written up, research questions, methods of analysis...

    Started by trinker‎, 05-28-2013 08:45 AM
    journal, psychometric, survey
    • Replies: 10
    • Views: 2,026
    05-28-2013, 09:16 PM Go to last post
  54. How to handle twins in an ROC curve?

    Hi everyone, I'm shaping some ROC curves for a study I'm working on, and our dataset is from a twin study. The main model is a LMM that has a...

    Started by renbelcher‎, 05-28-2013 10:22 AM
    • Replies: 3
    • Views: 1,291
    05-28-2013, 03:33 PM Go to last post
  55. Adequate sample sizes for countries

    Hello everyone: I am conducting a social science comparative study in several nations and I am worried about the sample size I need for each...

    Started by parsec2011‎, 05-28-2013 08:56 AM
    • Replies: 0
    • Views: 962
    05-28-2013, 08:56 AM Go to last post
  56. Merging 3 variables into 1 variable

    I need help please for my research. I've never worked with SPSS before!! When I did my questionnaire for each question I wanted and answer for more...

    Started by Susan83‎, 05-27-2013 04:20 PM
    aggregate
    • Replies: 0
    • Views: 976
    05-27-2013, 04:20 PM Go to last post
  57. Post How to detect statistically significant change in trend?

    Suppose I have two time series (Series1 and Series2) which are identical from timePeriod -200 to timePeriod 0. Say that in timePeriod 0 they are both...

    Started by catquas‎, 05-24-2013 03:03 PM
    • Replies: 0
    • Views: 2,210
    05-24-2013, 03:03 PM Go to last post
  58. Question Best method to analyze mediation and moderation with ordinal data?

    Hello! I'm new here (and to statistics as well). I could use your advice about how to analyze the data for my master thesis. The first part of...

    Started by delyangrozdev‎, 05-24-2013 04:32 AM
    • Replies: 7
    • Views: 6,314
    05-24-2013, 11:26 AM Go to last post
  59. (Using R) What’s the right test to compare for significance?

    First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! I’ve been...

    Started by Hugster‎, 05-24-2013 05:47 AM
    significance test
    • Replies: 0
    • Views: 13,687
    05-24-2013, 05:47 AM Go to last post
  60. Indirect effect size CI and Sobel give conflicting results

    Hi everybody I have been using Andrew Hayes PROCESS to calculate indirect effects in a multimediational model. Preacher and Hayes (2008) emphasise...

    Started by rosenmarsh‎, 05-24-2013 05:19 AM
    • Replies: 0
    • Views: 1,091
    05-24-2013, 05:19 AM Go to last post

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