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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: 18,731
    10-11-2014, 12:02 PM Go to last post
  1. Variance Inflation Factor

    Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

    Started by MasterStudent‎, 03-10-2016 08:03 AM
    • Replies: 10
    • Views: 5,019
    10-02-2016, 06:38 PM Go to last post
  2. Statistical method to rank Likert-items

    Dear Readers, Currently, I am conducting a study to investigate the need for assistance with a certain process. I used a survey including...

    Started by MvZ‎, 05-08-2017 04:14 AM
    likert, likert scale, preference, rank order data analysis, ranking
    • Replies: 10
    • Views: 1,453
    05-15-2017, 09:33 AM Go to last post
  3. Bonferroni Correction Factor !!!

    Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

    Started by Bala‎, 09-26-2008 02:44 AM
    • Replies: 9
    • Views: 25,738
    07-14-2009, 06:33 AM Go to last post
  4. Longitudinal analysis and the independence assumption

    This is a bit of a long one, but I would really appreciate some help with it. I have a long list of data which describes whether a violent...

    Started by Alley_Cat‎, 01-30-2009 12:45 PM
    • Replies: 9
    • Views: 4,947
    11-13-2011, 05:14 PM Go to last post
  5. Expected Value

    A list of n items is arranged in random order; to find a requested item, they are searched sequentially until the desired item is found. So, how will...

    Started by SmileAli‎, 05-07-2010 06:37 PM
    • Replies: 9
    • Views: 6,839
    05-08-2010, 05:29 AM Go to last post
  6. Nonparametric assumptions

    Hi, I've come across a paper in the environmental science literature that suggests that the assumption of independence (and additivity) needed in...

    Started by suobs‎, 07-24-2010 11:25 AM
    • Replies: 9
    • Views: 6,729
    07-29-2010, 11:17 AM Go to last post
  7. Working With Population Data

    Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

    Started by StevenK‎, 08-23-2010 06:14 PM
    • Replies: 9
    • Views: 7,090
    09-23-2010, 05:12 AM Go to last post
  8. analyse of likert scale confusion please help

    Hello I am conducting research into how behvaviour changes from year 1 to year 2 of study on a college course. I have provided students with a...

    Started by mhowells3‎, 02-23-2011 05:22 PM
    • Replies: 9
    • Views: 5,095
    08-23-2011, 07:58 PM Go to last post
  9. Research Design

    Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

    Started by blue2‎, 10-28-2010 04:48 PM
    • Replies: 9
    • Views: 4,009
    02-15-2011, 09:15 PM Go to last post
  10. level of significance 0.1%

    Hi! Would it be OK to use a level of significance of 0.1 -instead of traditional 0.05- when using non-parametric tests in bivariate analyses if...

    Started by juanpe000‎, 01-17-2011 08:10 AM
    • Replies: 9
    • Views: 24,474
    07-23-2013, 02:55 AM Go to last post
  11. Regression line slope for R^2 ~= 1

    Sorry if my question is answered in textbooks! I was wondering what the slope would be for the regression line of a regression that has an R squared...

    Started by wildetudor‎, 03-28-2011 12:21 PM
    • Replies: 9
    • Views: 12,812
    03-31-2011, 07:02 AM Go to last post
  12. test whether 2 mean scores are significantly different

    I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

    Started by Astero‎, 06-22-2011 09:28 AM
    psychology, spss, statistical test, statistics, statistics help
    • Replies: 9
    • Views: 9,926
    06-22-2011, 03:09 PM Go to last post
  13. Power

    Hi there, I need some help getting my head around this power concept. If there's a small but important effect, should you try and find it...

    Started by danony‎, 08-24-2011 06:25 PM
    • Replies: 9
    • Views: 2,420
    08-25-2011, 08:35 PM Go to last post
  14. Sample, population on Facebook

    Hello everyone, i need help verifying if my method is correct or if you can find any problems with it, and if you can i would like you to propose...

    Started by micdhack‎, 09-15-2011 05:34 AM
    • Replies: 9
    • Views: 2,950
    09-16-2011, 05:36 AM Go to last post
  15. Question I need help in my undergraduate project

    Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

    Started by Miss..Stats‎, 11-28-2011 04:50 PM
    • Replies: 9
    • Views: 2,790
    11-28-2011, 06:23 PM Go to last post
  16. Classification of patients based on continuous variable

    Dear TS users, I have got data on a group of patients and the amount of protein they consume. I want to classify the patients as malnourished or...

    Started by ledzep‎, 12-18-2011 05:35 PM
    • Replies: 9
    • Views: 2,144
    12-19-2011, 02:47 AM Go to last post
  17. Wink One Sample T-Test

    For an exercise is received speed measurements on two road points. The cars drove along an urban road (30mph) that opened into a rural road (60mph)....

    Started by Downburstx‎, 01-04-2012 05:41 AM
    normal distributed, one sample, t-test
    • Replies: 9
    • Views: 2,385
    01-08-2012, 02:06 PM Go to last post
  18. Question Scientific Theories

    When evaluating a theory, which of these criteria do you think is the most important, the least important, and why? Do all of these criteria need to...

    Started by misty‎, 01-17-2012 07:42 PM
    • Replies: 9
    • Views: 3,582
    01-19-2012, 02:40 PM Go to last post
  19. Mortality Statistics help

    My prof gave me a hospital mortality data to analysis but i can not think of any things else apart from crude mortality rate. Data set contains the...

    Started by dockiss‎, 02-07-2012 02:00 PM
    • Replies: 9
    • Views: 2,208
    02-10-2012, 06:23 AM Go to last post
  20. im i doing this right?

    Help PLEASE!!!! I'm attempting to do a stats assignment atm and I'm hoping to get some feedback on how im doing so far. the assignment is this: ...

    Started by tippiekatie‎, 03-28-2012 07:32 PM
    • Replies: 9
    • Views: 2,554
    03-29-2012, 01:17 PM Go to last post
  21. Where to find data (morning running vs evening running)?

    Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

    Started by john2012‎, 05-02-2012 10:29 AM
    • Replies: 9
    • Views: 2,693
    05-02-2012, 05:42 PM Go to last post
  22. Why use Chi-square?

    Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

    Started by Eugenie‎, 08-13-2012 09:33 AM
    chi squared, fisher exact test
    • Replies: 9
    • Views: 4,682
    08-15-2012, 01:58 PM Go to last post
  23. Why use Kruskal-Wallis?

    Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

    Started by Eugenie‎, 08-13-2012 09:44 AM
    anova, bootstrapping, kruskal-wallis
    • Replies: 9
    • Views: 7,289
    08-13-2012, 03:14 PM Go to last post
  24. Sphericity- why does it really matter?

    Can someone help me understand how a sphericity violation is a problem in repeated measures ANOVA a little better? I assume a sphericity violation...

    Started by DrJBN‎, 04-08-2013 09:08 AM
    • Replies: 9
    • Views: 1,869
    04-16-2013, 01:40 AM Go to last post
  25. Partial Correlation when one variable and the control are two-level ordinal variables

    I have one numerical variable and another two-level ordinal variable(e.g., one level is 27 and the other 51). I could classify it as a dichotomous or...

    Started by micdhack‎, 02-25-2013 12:34 PM
    • Replies: 9
    • Views: 10,246
    02-26-2013, 05:40 PM Go to last post
  26. Using a 'Z score' in a correlation.

    Hi all, I'm conducting a bi-variate correlation, using pearsons. Can i use a z score as one variable with the other variable being dichotomous? ...

    Started by pg0410‎, 03-14-2013 02:49 PM
    • Replies: 9
    • Views: 4,155
    04-01-2013, 01:59 PM Go to last post
  27. Homogeneity assumption mixed ANOVA

    For my research I did a mixed ANOVA. The homogeneity assumption was violated. However, I learned that this is only a problem when the group sizes...

    Started by Pluzan‎, 07-20-2013 06:37 AM
    • Replies: 9
    • Views: 3,820
    08-09-2013, 12:37 PM Go to last post
  28. How to estimate count data models with observations with incomplete spell periods?

    Dear friends, I have a data base of 51 contracts. My research consists of estimating the determinants of recurrent contract renegotiations. Thus I...

    Started by Raskolnikov‎, 08-25-2013 09:28 PM
    count data models, survival analysis
    • Replies: 9
    • Views: 1,517
    08-27-2013, 12:34 PM Go to last post
  29. Model Fit is Too Perfect: RMSEA & CFI are perfect; SRMR varies in invariance analyses

    I am running models looking at the fit of new self-report scale I have developed (CFA and measurement invariance by a number of different categories...

    Started by mem162000‎, 01-15-2014 01:47 PM
    • Replies: 9
    • Views: 17,138
    06-22-2016, 03:37 AM Go to last post
  30. Statistical significance of the accuracy of two distinct methods

    My task to achieve is the following: I have one given dataset at hand. Furthermore, I have given a gold standard I want to compare my results to....

    Started by killver‎, 10-11-2013 07:58 AM
    • Replies: 9
    • Views: 2,312
    10-14-2013, 08:49 AM Go to last post
  31. Stat used in Med Articles - HELP

    Hi Folks, Just to let you know I didn't even know where to post the thread, so apologize if I am in the wrong section :) I am reviewing articles...

    Started by cloud‎, 10-08-2013 08:55 PM
    • Replies: 9
    • Views: 1,770
    10-09-2013, 04:55 AM Go to last post
  32. Poll Poll: Assumptions independent variables when just want to control/adjust for - less strict?

    Is it true that when one just want to control for/adjust for in linear og logistic regression models, the variables one wants to control for/adjust...

    Started by kristian‎, 03-02-2014 01:58 AM
    adjustment, confounders, control for, linear regression, logistic regression
    • Replies: 9
    • Views: 2,355
    03-08-2014, 05:48 AM Go to last post
  33. Sample size question - thanks for helping this right brainer!!

    It's been a long time since I *somehow* chose a sample size of 75 from a homogenous, hard to reach population of 3,156. Why would I do this, I...

    Started by purplelily‎, 03-03-2014 02:49 AM
    sample size, survey sampling
    • Replies: 9
    • Views: 1,641
    03-05-2014, 05:17 AM Go to last post
  34. Good Book on Mathematical Statistics

    I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

    Started by elanmorin‎, 08-27-2014 03:08 PM
    • Replies: 9
    • Views: 2,715
    09-17-2014, 07:09 AM Go to last post
  35. Calculating the bias of variance estimator

    Dear all, I have been given two variance (S^2) estimators, S1 and S2. I am not including the square (^2) as it may cause confusion. And I am to...

    Started by UniApply‎, 03-03-2016 02:29 PM
    • Replies: 9
    • Views: 1,761
    03-03-2016, 10:30 PM Go to last post
  36. Stuggling with choosing the correct test.

    So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

    Started by dvtolusso‎, 08-19-2016 02:26 PM
    • Replies: 9
    • Views: 1,920
    08-27-2016, 01:11 PM Go to last post
  37. Can I use fishers exact test in this situation?

    You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

    Started by slamer2000‎, 05-15-2017 01:20 AM
    dichotomous, fishers exact, ordinal and categorical
    • Replies: 9
    • Views: 1,825
    05-22-2017, 08:47 PM Go to last post
  38. comparing two measurements over time

    I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

    Started by dirkheld‎, 08-22-2007 07:11 AM
    • Replies: 8
    • Views: 7,802
    08-27-2007, 04:38 AM Go to last post
  39. continuous/categorical IV in anova

    Hi, I understand that ANOVA assumes categorical IVs, and ANCOVA should be used if continuous IVs are included in the model. I am currently analyzing...

    Started by kk49‎, 05-21-2008 08:41 PM
    • Replies: 8
    • Views: 14,965
    05-23-2008, 08:33 AM Go to last post
  40. Tricky running mean and standard deviation problem

    Hi, I have a pretty tricky problem that I can't seem to solve. The basic problem can be expressed as follows: - I have a stream of data (in my...

    Started by james_2002uk‎, 01-08-2009 06:14 PM
    • Replies: 8
    • Views: 10,052
    01-13-2009, 06:00 PM Go to last post
  41. Help on Factor analysis and Extension

    Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

    Started by amjath‎, 01-21-2009 05:08 PM
    • Replies: 8
    • Views: 5,229
    01-26-2009, 12:28 PM Go to last post
  42. hypothesis testing for least squares fitting

    I have a spectrum that is composed of several things. I do least squares fitting in order to determine the amount of each component. For example: ...

    Started by llee‎, 02-11-2009 11:00 AM
    • Replies: 8
    • Views: 6,897
    03-02-2009, 10:30 AM Go to last post
  43. Stats for whole population data

    Hi all - I'm an employee of a government department who has been asked to answer some question to do with a whole population data set. In short, here...

    Started by JimRobertsonnz‎, 12-07-2009 08:41 PM
    • Replies: 8
    • Views: 6,981
    01-04-2010, 11:13 AM Go to last post
  44. multiple groups & dichotomous responses

    I have a set of data from a number of countries where interviewees have answered simple yes/no questions. The "DV" is, in other words, 1 or 0, and...

    Started by pjotr66‎, 07-09-2010 04:02 AM
    • Replies: 8
    • Views: 5,327
    07-16-2010, 10:29 AM Go to last post
  45. Summary variable for adversities

    Fellow members, I'm doing research currently on the effects of childhood adversities on development of the autonomic nervous system. I'm a little...

    Started by Link‎, 10-05-2010 11:55 PM
    • Replies: 8
    • Views: 5,794
    10-07-2010, 12:30 AM Go to last post
  46. Exclamation what am i supposed to do?

    Let X_1,X_2,........,X_n ~ N(\mu,\sigma^2), both \mu and \sigma^2 unknown. Find the value of b which minimizes the MSE of the estimator...

    Started by Sambit‎, 11-02-2010 01:51 AM
    • Replies: 8
    • Views: 3,049
    11-02-2010, 11:22 AM Go to last post
  47. One sample t-test: help needed

    Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

    Started by scrap‎, 11-15-2010 12:30 PM
    • Replies: 8
    • Views: 3,721
    11-22-2010, 08:42 AM Go to last post
  48. population normally distributed, sample not, parametric test allowesd?

    Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

    Started by BBD‎, 12-08-2010 09:19 AM
    • Replies: 8
    • Views: 18,204
    02-19-2011, 07:26 PM Go to last post
  49. Choosing Statistical Tests for a Study

    I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

    Started by mariejolene‎, 03-22-2011 12:09 AM
    • Replies: 8
    • Views: 5,266
    03-28-2011, 11:41 PM Go to last post
  50. Correct method for determining group membership

    Hi, I am doing some research into what determines whether or not people gain an educational qualification in later life. My thought was to run...

    Started by lmsava‎, 07-20-2011 10:42 AM
    • Replies: 8
    • Views: 5,306
    07-29-2011, 07:03 AM Go to last post
  51. Mean change over time attriubted to another variable

    The following is the research question that was posed to me: How much of impact on the increase in satisfaction over last year can be attributed...

    Started by t_star‎, 09-26-2011 09:24 AM
    • Replies: 8
    • Views: 5,058
    09-28-2011, 04:34 PM Go to last post
  52. Mean centering (good bad or ugly?)

    As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

    Started by trinker‎, 10-15-2011 06:48 PM
    • Replies: 8
    • Views: 15,964
    10-16-2011, 12:45 PM Go to last post
  53. Smile reliability and pilot testing...losing plot!

    Hi All I have modified an exisiting survey, added more questions. I have two separate scaleswithin this measuring different constructs, the rest...

    Started by Deborah Redmond‎, 12-06-2011 11:58 PM
    • Replies: 8
    • Views: 3,488
    12-08-2011, 03:19 PM Go to last post
  54. Directional or Non-directional Hypothesis for Independant t-test?

    I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

    Started by kathmustdie‎, 12-27-2011 12:36 AM
    • Replies: 8
    • Views: 12,359
    12-27-2011, 02:48 PM Go to last post
  55. Survey Analysis

    Hey Guy's I really need your help. I am not a statistician. I have to analyze surveys that have 6 observations (people) and 20 factors (food...

    Started by zqkal‎, 01-19-2012 03:07 PM
    data analysis, statistical research, survey analysis
    • Replies: 8
    • Views: 2,270
    01-30-2012, 12:20 PM Go to last post
  56. Curve parameters

    Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

    Started by nrstein1‎, 02-02-2012 03:15 PM
    • Replies: 8
    • Views: 2,766
    03-13-2012, 03:10 PM Go to last post
  57. simultaneous equations

    hi guys, i need help regarding simultaneous equations. for the following simultaneous equations: R=b1+b2*Q+errorterm2...

    Started by little_stats‎, 04-17-2012 05:05 PM
    • Replies: 8
    • Views: 1,984
    04-21-2012, 08:48 AM Go to last post
  58. Low cronbach's alpha - any remedy?

    Hi there, I want to construct a scale of 'contacting government' based on the question 'Please indicate if in the past year you contacted govt...

    Started by jesse‎, 07-22-2012 09:43 PM
    • Replies: 8
    • Views: 34,012
    07-27-2012, 08:52 AM Go to last post
  59. Mentioning that data was not randomly sampled in discussion?

    Hi there, I was just wondering whether the following is a good idea to mention in my discussion: Im investigating depression and maladaptive...

    Started by veggie‎, 08-12-2012 09:04 AM
    • Replies: 8
    • Views: 1,966
    08-13-2012, 12:58 PM Go to last post
  60. Does A Low Power In A Study Increase Type I Error Probability?

    Two statisticians in a forum (not here) are claiming that the probability of a Type I error increases when the study is small. They argue that a...

    Started by Musibrique‎, 11-09-2012 11:04 AM
    • Replies: 8
    • Views: 9,876
    11-13-2012, 01:22 PM Go to last post

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