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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: 18,669
    10-11-2014, 12:02 PM Go to last post
  1. Interpretation of Multinomial Regression Output

    Hi I have attached the output of a Multinomial Regression.I have taken referrence group as 4 for the variable next_Cur_Cust_Segment_LVL_2. ...

    Started by stata‎, 04-20-2010 09:32 AM
    • Replies: 0
    • Views: 4,536
    04-20-2010, 09:32 AM Go to last post
  2. low coefficient alpha

    Hello, I have a question about coefficient alpha. How does having a low alpha effect your statistical tests if you are running say an ANOVA or a...

    Started by psychologygirl‎, 05-19-2009 11:19 AM
    • Replies: 0
    • Views: 4,533
    05-19-2009, 11:19 AM Go to last post
  3. 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: 4,516
    08-03-2014, 04:53 PM Go to last post
  4. Help with choosing statistics

    Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

    Started by Dave4‎, 08-29-2011 10:43 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,511
    11-22-2011, 12:09 AM Go to last post
  5. Doubts analyzing Likert scales

    Hi all, I thought about analyzing results from Likert scale using Kruskal-Wallis, but the more I read about it, the more confused I get. People...

    Started by mprksc‎, 07-10-2012 01:41 PM
    • Replies: 3
    • Views: 4,511
    07-12-2012, 09:01 PM Go to last post
  6. Chi and linear-by-linear

    A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

    Started by abacus‎, 03-13-2013 11:45 AM
    • Replies: 4
    • Views: 4,511
    03-14-2013, 01:37 AM Go to last post
  7. Which Model of ICC to use: one way; two way mixed, or two way random?

    Hello All, I am using spss 21 My goal is to justify aggregating individual lower-level viability scores into a team higher-level viability score...

    Started by VCH‎, 08-02-2013 05:26 PM
    aggregate, anova, icc
    • Replies: 0
    • Views: 4,509
    08-02-2013, 05:26 PM Go to last post
  8. Calculating Effect Size

    Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

    Started by shafiqurrehman1‎, 05-17-2011 01:01 AM
    • Replies: 7
    • Views: 4,500
    05-24-2011, 11:57 PM Go to last post
  9. Formula of Return

    I am new at Business Research, i have a problem that i am not sure about the formula of calculating return. Can you please help me confirm that...

    Started by SFranck‎, 04-05-2011 03:44 PM
    formula of return
    • Replies: 1
    • Views: 4,498
    04-05-2011, 07:38 PM Go to last post
  10. Converting 1 Distribution to Another

    I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

    Started by zeloc‎, 03-06-2010 12:51 PM
    • Replies: 5
    • Views: 4,497
    03-26-2010, 12:50 PM Go to last post
  11. Sunfish NMDS/PERMANOVA in reverse

    I have extensive habitat data for four sunfish species, and I would like to determine if (statistically) they partition habitats to reduce...

    Started by sms16‎, 02-07-2011 02:02 PM
    permanova nmds sunfish
    • Replies: 3
    • Views: 4,497
    02-08-2011, 12:41 AM Go to last post
  12. Need for Bonferroni correction

    Hi All, I'm hoping you can help me figuring out whether doing ANOVA or MANOVA save on power. My understanding is that ANOVA will tell you if...

    Started by pbakker‎, 09-21-2011 02:00 PM
    • Replies: 4
    • Views: 4,485
    09-21-2011, 04:19 PM Go to last post
  13. Question Regarding Results from Matched Pair T-Test versus Tamhane's Test

    I have a group of data from a survey regarding attitudes. The data was collected pre and post intervention on a group of students. The data n is...

    Started by vbode‎, 09-06-2010 07:08 AM
    • Replies: 1
    • Views: 4,475
    09-07-2010, 10:44 AM Go to last post
  14. Converting individual scores into group scores in SPSS

    Hello all, I am using SPSS for my Master thesis and I've got a question. Hope someone is able to help me, because I'm stuck. My variables are:...

    Started by Kimsty‎, 09-23-2013 01:12 PM
    • Replies: 3
    • Views: 4,460
    09-24-2013, 02:25 PM Go to last post
  15. Mahalanobis Distance

    I am doing research concerning the degradation of a particular system... In this case, a cooling fan for a computer. I am measuring three...

    Started by 3waytie4last‎, 09-11-2008 09:42 AM
    • Replies: 0
    • Views: 4,459
    09-11-2008, 09:42 AM Go to last post
  16. markov chain modelling

    Hi guys, Got a complex question regarding markov chain modelling. I'll start off with an example. Say you own a credit card and you can only...

    Started by ace123‎, 08-22-2008 04:51 PM
    • Replies: 7
    • Views: 4,454
    08-23-2008, 09:12 PM Go to last post
  17. Tests for Comparing AUCs for Significant Increases

    I'm currently working on a project aimed at improving some of my program's risk assessment tools. We generally use AUCs to evaluate performance of...

    Started by PsychResearcherRASIS‎, 07-06-2011 11:41 PM
    • Replies: 2
    • Views: 4,452
    07-07-2011, 06:17 AM Go to last post
  18. Can fixed effects models deal with nested data?

    I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

    Started by trinker‎, 03-08-2013 01:39 PM
    multilevel model
    • Replies: 4
    • Views: 4,450
    03-10-2013, 03:41 PM Go to last post
  19. Percent Change

    What should I put for the % change if the beginning value is 0 and the final value is >0, other than "not applicable"?

    Started by yu78zer1‎, 03-08-2010 03:37 AM
    • Replies: 2
    • Views: 4,448
    03-16-2010, 01:38 AM Go to last post
  20. puzzling change in effect in multilevel linear regression; suppressor effect?

    In my analysis of educational achievement of second generation migrants, I modelled the effect of mother's and father's education in two ways, which...

    Started by Soporiferous‎, 09-02-2010 08:48 AM
    • Replies: 3
    • Views: 4,436
    09-09-2010, 05:56 AM Go to last post
  21. Likelihood Ratio Test

    Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters...

    Started by Jamesd2‎, 01-11-2011 06:28 PM
    hypothesis testing, likelihood
    • Replies: 5
    • Views: 4,435
    01-13-2011, 02:10 PM Go to last post
  22. Negative confidence intervals

    HI THERE!! I am presenting 95% CIs in my thesis for the means of the data sets like metric tons of tuna exported per month, value of tuna exported...

    Started by nelson_rabbit‎, 09-24-2013 06:18 AM
    • Replies: 4
    • Views: 4,427
    09-24-2013, 08:47 AM Go to last post
  23. Comparing two groups responses to a 5 question likert questionnaire

    I'm analyzing a likert questionnaire to determine if respondent's answered questions differently based on whether they compete frequently or...

    Started by aduray‎, 05-21-2012 09:34 PM
    • Replies: 5
    • Views: 4,424
    05-21-2012, 11:08 PM Go to last post
  24. Is this a vaild data transformation method?

    Hello Talkstats people, I am another hopeless case who needs some help with my dissertation statistics. Basically I am not sure if the method...

    Started by anotherhopelesscase‎, 11-26-2008 09:49 AM
    • Replies: 0
    • Views: 4,398
    11-26-2008, 09:49 AM Go to last post
  25. Survival Analysis with non 0 start time

    I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

    Started by johank‎, 03-28-2011 05:04 PM
    • Replies: 2
    • Views: 4,395
    03-28-2011, 07:11 PM Go to last post
  26. how to control for firm performance ? (control variables) ?

    I'm doing a research on how the debt ratio affect firm performance dependent variable is ROA independent variable is debt ratio control variable...

    Started by Mareah‎, 07-01-2012 08:44 AM
    • Replies: 0
    • Views: 4,374
    07-01-2012, 08:44 AM Go to last post
  27. generate data for logistic regression simple question

    Hi there, If I want to see how good can I estimate the coefs in the simple linear model y=b0+b1*x+e when X follows exponential with mean 3 (or...

    Started by leo nidas‎, 08-28-2008 12:55 PM
    • Replies: 1
    • Views: 4,372
    08-28-2008, 03:19 PM Go to last post
  28. TOST- two one sided t-test

    Does anyone know how to compute these by hand or in minitab? Its an equivalence test, Thanks

    Started by JB89‎, 02-24-2012 10:51 AM
    • Replies: 0
    • Views: 4,372
    02-24-2012, 10:51 AM Go to last post
  29. Optimal combination of conditions

    I am looking to find an efficient process to determine the set of conditions that results in the optimal likelihood of accomplishing some task. ...

    Started by haz33‎, 02-03-2011 04:30 PM
    • Replies: 12
    • Views: 4,366
    02-06-2011, 02:55 PM Go to last post
  30. Smile kappa intra observer error test on ordinal

    hi, sorry if this is all wrong ive never done stats or posted on this forum. im writing my masters dissertation in bioarchaeology and have a...

    Started by elwen_3‎, 09-10-2012 01:04 PM
    • Replies: 3
    • Views: 4,361
    09-11-2012, 12:23 PM Go to last post
  31. Comparing pretest and posttest measures of intervention group with control

    Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

    Started by Jannez‎, 02-14-2012 05:27 AM
    • Replies: 3
    • Views: 4,358
    02-27-2012, 12:05 PM Go to last post
  32. EM Algorithm for Gaussian Mixture model fitting data with missing values

    I have an EM function that will take regular data with no missing values, and compute means, standard deviations, and probabilities of components of...

    Started by zzzc‎, 03-31-2011 09:15 PM
    • Replies: 1
    • Views: 4,356
    04-12-2011, 11:26 AM Go to last post
  33. 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: 4,342
    05-30-2013, 03:20 PM Go to last post
  34. Pre and Post Likert Scale Survey Help

    Hi, I am needing some help with a survey I am trying to get ready to conduct. The survey will be a pre and post survey given to the same group of...

    Started by rx_student‎, 07-05-2011 11:22 AM
    • Replies: 1
    • Views: 4,339
    07-05-2011, 11:27 AM Go to last post
  35. Which test to believe ?

    Hi, I did some analysis, I had 1 scale variable and 1 grouping variable with 2 groups. I ran a t-test and got p value of 0.09. The distribution...

    Started by NN_STAT‎, 07-13-2011 12:19 PM
    • Replies: 10
    • Views: 4,335
    07-16-2011, 02:04 AM Go to last post
  36. Structured Modeling or Multiple Models?

    We conducted a study in order to determine the factors that influenced turtle nest site selection. We collected various environmental variables from...

    Started by Ruthere‎, 12-20-2016 09:24 AM
    generalized linear model, scientific design, structured modeling
    • Replies: 0
    • Views: 4,334
    12-20-2016, 09:24 AM Go to last post
  37. sample size - power calculations

    Hi, would be great if anybody could help me on this. I want to estimate the impact of an independent variable x (lets say a social program) on the...

    Started by flo2222‎, 06-05-2009 10:12 AM
    • Replies: 1
    • Views: 4,333
    06-23-2009, 12:01 AM Go to last post
  38. Poll Poll: PCA, FA, CFA, latent variables, and making a scale.

    Hi! I was wondering if anyone had any suggestions for me. I'm working with two datasets. One contains a population of cases (n=25) from 2005, and...

    Started by psnp‎, 10-27-2008 01:58 PM
    • Replies: 1
    • Views: 4,327
    10-28-2008, 12:13 PM Go to last post
  39. Normality assumption test statistic for independent sample t-test (SigmaPlot output)

    I'm using SigmaPlot12 to compare the means/medians of two populations. First, I run the Mann-Whitney Rank Sum Test. The software recommends using...

    Started by cassarch‎, 06-14-2011 11:00 AM
    • Replies: 0
    • Views: 4,316
    06-14-2011, 11:00 AM Go to last post
  40. excel to SAS

    library work 'c:\documents and settings\desktop\s' data s.sas; infile 'C:\Documents and Settings\Desktop\sas.prn' firstobs=2; input subject salary...

    Started by shanehall.m‎, 11-07-2011 09:48 AM
    infile, sas, sas program
    • Replies: 6
    • Views: 4,315
    11-07-2011, 04:08 PM Go to last post
  41. Cool Alternative to two-sample t-test when proportions are SMALL (<0.001)

    Hi, I'm looking for an alternative to the two-sample (independent) t-test for equality of proportions. The two-sample t-statistic only holds...

    Started by swnicholson‎, 01-14-2009 04:15 PM
    • Replies: 0
    • Views: 4,311
    01-14-2009, 04:15 PM Go to last post
  42. ANOVA n00b questions

    Hello! I'm putting together a proposal and would like to conduct a certain type of analysis but my wording on this is rather weak so please correct...

    Started by mwill101‎, 11-07-2011 01:07 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,309
    11-07-2011, 10:09 PM Go to last post
  43. Mann-Whitney or independant T-test?

    Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

    Started by dkhamoo‎, 04-15-2011 10:56 AM
    • Replies: 3
    • Views: 4,298
    06-13-2011, 05:01 PM Go to last post
  44. regression when the dependent variable is a proportion or percent?

    If my outcome was dichotomous, I would use logistic regression. It my outcome was continuous, I would use linear regression. If my outcome was a...

    Started by proctice‎, 05-23-2011 03:04 PM
    • Replies: 1
    • Views: 4,292
    05-23-2011, 03:46 PM Go to last post
  45. 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: 4,291
    07-08-2014, 12:13 AM Go to last post
  46. Probability Theory Exam

    Studying for a probability exam and here are two practice problems I can't seem to solve 1. Let P be the uniform distribution on a finite set...

    Started by statboy‎, 09-17-2008 10:04 AM
    • Replies: 1
    • Views: 4,285
    09-17-2008, 01:21 PM Go to last post
  47. homogenity of variance

    I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

    Started by fromsydney‎, 09-21-2011 09:08 PM
    • Replies: 3
    • Views: 4,281
    09-22-2011, 02:58 PM Go to last post
  48. Two-step PPS stratified sample: how to choose additional respondents?

    Hello, I find nothing in the literature on how to deal with this, so here goes. We have a relatively complex sample, and we need to acquire...

    Started by autarkie‎, 03-11-2011 03:46 AM
    • Replies: 0
    • Views: 4,279
    03-11-2011, 03:46 AM Go to last post
  49. Fisher's Scoring Iterations ?

    Hi, what does Fisher's Scoring Iteration mean?? Fisher's exact calculation gives a score of 4 but what does this number mean exactly?? Thanks, S

    Started by palmer86‎, 04-15-2013 03:15 PM
    • Replies: 0
    • Views: 4,279
    04-15-2013, 03:15 PM Go to last post
  50. Marginal Effects

    I know how to run marginal effects on STATA, but was never taught the theory behind them. Working through a textbook that I'm thinking of adopting...

    Started by wjm15‎, 02-28-2010 07:42 PM
    • Replies: 0
    • Views: 4,271
    02-28-2010, 07:42 PM Go to last post
  51. z-test rule.

    Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

    Started by littledic‎, 04-19-2011 12:04 PM
    • Replies: 5
    • Views: 4,265
    04-19-2011, 12:28 PM Go to last post
  52. Testing change between 2 samples at 2 periods of time

    Hi Id wonder if anyone could help me. Im having one of those brain freeze moments when you think you may know the answer but really would...

    Started by lost in stats‎, 02-20-2009 02:54 AM
    • Replies: 0
    • Views: 4,264
    02-20-2009, 02:54 AM Go to last post
  53. Analysing an unbalanced factorial design

    Hello, I have data from an unbalanced factorial design, and would like some suggestions to analyse them. It is supposed to be 3 x 2 factorial...

    Started by madegwu‎, 02-28-2012 02:17 AM
    • Replies: 2
    • Views: 4,262
    02-28-2012, 11:43 PM Go to last post
  54. Please give me feedback on my study proposal!

    Greetings, I work for a small software company, and we will be performing a statistical experiment on the effectiveness of a mobile learning...

    Started by FreddyZ‎, 03-22-2011 04:08 PM
    • Replies: 2
    • Views: 4,255
    03-23-2011, 11:20 AM Go to last post
  55. Question about Stationary R^2 and Ljung-Box Statistics in ARIMA Models...

    On the results of my ARIMA models in SPSS, I am getting Ljung-Box statistics that are statistically significant (P < 0.05) but also horrible R^2...

    Started by stormmedic85‎, 07-25-2010 07:44 PM
    • Replies: 0
    • Views: 4,253
    07-25-2010, 07:44 PM Go to last post
  56. Yule Walker - AR(1) - Covariance Forumla

    Hello, I have the AR(1) process: Yt=phi*Yt-1 + et According to text books we ,ultiply by Yt-k, so we have: Yt*Yt-k=phi*Yt-1*Yt-k+et*Yt-k and...

    Started by zarasandreas‎, 10-01-2011 06:23 AM
    • Replies: 1
    • Views: 4,253
    10-01-2011, 11:22 AM Go to last post
  57. Exclamation chi-square difference test

    Dear everybody, I need your help. I have submitted a manuscript showing that a two factor model is better than a single-factor model. I just have...

    Started by mohsenn‎, 01-13-2011 05:04 AM
    • Replies: 0
    • Views: 4,251
    01-13-2011, 05:04 AM Go to last post
  58. non-parametric 1-way anova, but samples not independent

    Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

    Started by DrCJones‎, 09-07-2010 01:51 AM
    • Replies: 1
    • Views: 4,239
    09-07-2010, 07:27 AM Go to last post
  59. Transition matrix of a Markov chain with a given limiting distrubuti

    I want to create a transition matrix P (e.g. 4x4) for a stationary Markov chain with a given limiting distribution p, but I want P to bear as much...

    Started by efl86‎, 01-08-2010 12:41 PM
    • Replies: 1
    • Views: 4,238
    04-08-2010, 08:44 PM Go to last post
  60. Lightbulb Using Kendall test to find correlation between Likert type data

    Greetings! I am doing a small experiment and I was wondering if I have the correct method for analysing the data. Two groups of participants...

    Started by kutlak.roman‎, 01-19-2011 11:31 AM
    analysis, correlation, data, kendall, likert
    • Replies: 0
    • Views: 4,234
    01-19-2011, 11:31 AM Go to last post

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