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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: 18,729
    10-11-2014, 12:02 PM Go to last post
  1. Lightbulb can not figure out simple question, please help

    hi everyone! I have the following question: while running univariate GLM, I have encountered the situation when mean differences between groups...

    Started by Antouanetta‎, 07-04-2013 10:36 AM
    glm, pairwise comparison, significance, spss output, univariate
    • Replies: 1
    • Views: 988
    07-08-2013, 03:22 AM Go to last post
  2. Can pilots be included in the full study?

    Random sampling = each member gets an equal chance of being selected. If this is done with a random number generator(lottery style) then the two...

    Started by micdhack‎, 11-14-2011 06:39 AM
    • Replies: 0
    • Views: 1,354
    11-14-2011, 06:39 AM Go to last post
  3. Can relationship be both moderated and mediated?

    Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

    Started by eva2‎, 01-17-2011 01:59 PM
    • Replies: 3
    • Views: 3,713
    01-17-2011, 07:35 PM Go to last post
  4. Can sensitivity be calculated in non-binary variables?

    Hi everyone, Is there any analogous measure of sensitivity and specificity for non-binary variables? For example, if I want to study the...

    Started by AJLRB‎, 07-19-2017 03:17 AM
    • Replies: 2
    • Views: 417
    07-20-2017, 05:27 AM Go to last post
  5. Question Can someone edumacate me about this? About comparing two samples


    Started by TheMonk‎, 05-18-2011 02:05 PM
    • Replies: 0
    • Views: 2,216
    05-18-2011, 02:05 PM Go to last post
  6. Can they called unequal sample sizes and t-test/ANOVA?

    I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

    Started by cookiemonster‎, 05-02-2011 03:09 AM
    • Replies: 0
    • Views: 2,757
    05-02-2011, 03:09 AM Go to last post
  7. Can we have a Logit that punishes some missclassifications more harhsly than others ?

    Suppose I wish to estimate a logit model to predict Large losses when trading stocks, well I might say y_t = 1 if that trade was a large loss. But...

    Started by thedreamshaper‎, 06-19-2015 04:38 AM
    • Replies: 4
    • Views: 1,433
    06-19-2015, 07:06 AM Go to last post
  8. 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: 3,837
    07-07-2014, 03:45 PM Go to last post
  9. Can you combine survey responses for a Confidence Interval

    Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

    Started by lincoln5‎, 11-06-2010 01:31 PM
    • Replies: 2
    • Views: 2,539
    11-10-2010, 11:04 AM Go to last post
  10. Can you estimate the power of a test by simulating data?

    I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

    Started by Disvengeance‎, 07-05-2013 05:48 PM
    • Replies: 6
    • Views: 1,638
    07-06-2013, 06:31 PM Go to last post
  11. Can you use correlation for percentages?

    I have two variables: the number of employees who work from home in the firm and the number of independent contractors in the firm - and I have this...

    Started by sas‎, 04-24-2017 11:22 AM
    correlation, correlation analysis
    • Replies: 0
    • Views: 815
    04-24-2017, 11:22 AM Go to last post
  12. Can't find a convenient test for this huge dataset :-(

    Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

    Started by Abdel‎, 05-12-2009 08:55 PM
    • Replies: 0
    • Views: 2,783
    05-12-2009, 08:55 PM Go to last post
  13. canonical correlation and pseudoreplication

    Hello I have just joined Talk Stats and was hoping you all might be able to give me some advice. I have used a canonical correlation analysis...

    Started by mags‎, 10-20-2011 11:30 PM
    canonical correlation, pseudoreplication
    • Replies: 2
    • Views: 2,231
    11-13-2011, 11:00 PM Go to last post
  14. canonical correlation in discriminant analysis

    I know it represents how good a variable discriminates, but what is the range of this? What does it actually mean when for example the canonical...

    Started by Annvdb‎, 06-10-2014 12:09 PM
    • Replies: 0
    • Views: 1,504
    06-10-2014, 12:09 PM Go to last post
  15. Canonical Discriminant analysis.

    Hi everyone :) I am new here. May be my query is too easy for you people but I have no idea how to do that. :confused: :( .Please help me. So my...

    Started by sristi‎, 03-06-2013 02:51 AM
    • Replies: 3
    • Views: 3,658
    03-19-2013, 02:54 PM Go to last post
  16. Capability Analysis with Attribute Data

    Is it possible to run Capability Analysis with attribute data? Data is a yes/no or pass/fail spanning 6months or work. Thank you for any...

    Started by NorthShore‎, 11-15-2011 12:58 PM
    • Replies: 1
    • Views: 2,769
    11-15-2011, 08:21 PM Go to last post
  17. Catching a growth trend variable for 5 yearly sales number

    Hey everyone, I'm doing research in international business. I will skip the details and get to my basic problem directly. I have 300 firms in...

    Started by raulz‎, 03-19-2011 07:39 AM
    • Replies: 0
    • Views: 2,611
    03-19-2011, 07:39 AM Go to last post
  18. Categorical covariate in ancova??

    I have 1 continuous IV, one categorical IV and one continuous DV. Normally you'd investigate the effect of the categorical IV on the DV, corrected...

    Started by kelvarnsen‎, 03-28-2013 02:46 PM
    • Replies: 1
    • Views: 4,238
    04-08-2013, 06:03 PM Go to last post
  19. Categorical data goodness of fit question

    Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

    Started by szm‎, 02-21-2012 04:12 PM
    categorical data analysis, chi square, deviance, genmod, log linear
    • Replies: 6
    • Views: 3,559
    02-21-2012, 06:20 PM Go to last post
  20. categorical variable as covariate in ANOVA?

    Hi, I have a within-subject factor with 3 levels and find no main effect when I do an ANOVA. I kind of predict that this is due to the...

    Started by OS449‎, 01-19-2013 09:31 AM
    • Replies: 1
    • Views: 3,091
    01-22-2013, 10:47 AM Go to last post
  21. Categorical vs Ordinal data analysis

    I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

    Started by MiltonF‎, 09-14-2010 10:15 PM
    • Replies: 3
    • Views: 10,761
    04-22-2012, 12:41 PM Go to last post
  22. Cca

    Hello In CCA is it a must that the number of IV's to be less than or equal the number of DV's,i mean are there any assumptions or conditions about...

    Started by osamahamza‎, 09-26-2012 02:53 AM
    • Replies: 5
    • Views: 2,051
    09-30-2012, 02:32 AM Go to last post
  23. Cell count-which test to choose when comparing two groups to a control?

    Hello dear members of the Talkstats forum, In my research we counted algae cells with the counting chamber.N=8.We have the means of these three...

    Started by cos85‎, 03-21-2014 01:07 PM
    microbiology groups
    • Replies: 0
    • Views: 1,144
    03-21-2014, 01:07 PM Go to last post
  24. Cell culture experiments - parametric testing when there are only three repeats!

    Felt this was a theoretical discussion point. My thesis includes cell culture experiments with 100,000 cells per condition repeated three times....

    Started by drgpenman‎, 09-22-2015 01:06 PM
    • Replies: 0
    • Views: 1,459
    09-22-2015, 01:06 PM Go to last post
  25. Census & tests for significance?

    I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

    Started by pbakker‎, 11-12-2010 09:35 AM
    • Replies: 6
    • Views: 6,112
    11-12-2010, 02:09 PM Go to last post
  26. Census data: Should I worry about sample size and pvalues?

    Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

    Started by Marvin85‎, 06-03-2016 03:51 PM
    census data, logistic, sample size, statistical power
    • Replies: 6
    • Views: 1,591
    06-07-2016, 08:22 AM Go to last post
  27. Centering for interactions in multiple regression ??

    This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

    Started by danielkeeton‎, 11-11-2008 09:37 AM
    • Replies: 5
    • Views: 25,856
    12-01-2008, 06:50 PM Go to last post
  28. Centering level-1 interaction terms in HLM

    Dear all, I’m running multilevel analyses with HLM and wish to examine an interaction between two level 1 predictor variables. Following...

    Started by Linda Mueller‎, 12-21-2016 09:18 AM
    centering variables, hlm7, moderation, multi level
    • Replies: 1
    • Views: 2,755
    12-21-2016, 01:24 PM Go to last post
  29. Central Limit Theorem

    Hi guys, According to the central limit theorem, if I have a sample of n independent variables X1,....Xn, from ANY distribution, the sample mean...

    Started by WeeG‎, 05-03-2010 02:20 AM
    • Replies: 1
    • Views: 3,265
    05-03-2010, 06:51 AM Go to last post
  30. Certain sample size needed for HLM?

    I have a data set of test scores and memory scores of 111 students, nested in 12 different classroom. 6 classrooms are from high income areas and 6...

    Started by MTT‎, 11-02-2009 02:44 PM
    • Replies: 3
    • Views: 17,342
    11-04-2009, 10:14 AM Go to last post
  31. CFA using AMOS: Poor model fit for an instrument

    Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

    Started by Star7‎, 10-25-2013 07:27 AM
    • Replies: 3
    • Views: 3,451
    10-25-2013, 06:10 PM Go to last post
  32. Challenge: dependent variable observed randomly over time

    Hello everyone, I have been working on this problem and couldn't find a solution so any kind of help is more than welcome! I have data ranging...

    Started by Peter_Hoft2‎, 06-29-2011 08:55 AM
    missing, panel data, time series
    • Replies: 1
    • Views: 2,094
    07-01-2011, 01:41 AM Go to last post
  33. Chance performance in a binary choice task

    Hello! I am analyzing data in which participants have answered 80 binary-choice questions; one option is correct and one option is incorrect. Is...

    Started by bimodal‎, 03-26-2012 10:58 AM
    • Replies: 1
    • Views: 2,282
    03-26-2012, 11:34 AM Go to last post
  34. Change over time

    Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

    Started by Duggas03‎, 08-26-2016 06:03 AM
    patients, time trend
    • Replies: 2
    • Views: 810
    08-26-2016, 06:55 PM Go to last post
  35. Question Changing from 5-point to 3-point scale

    We are considering changing our guest satisfaction survey from a 5-point scale to a 3-point scale. What is the likely affect on "Top Box" scores? In...

    Started by Redhat‎, 03-26-2009 08:12 AM
    • Replies: 0
    • Views: 5,550
    03-26-2009, 08:12 AM Go to last post
  36. Checking conditional and mutual independence

    Hi, I am working on bayesian networks and i am encountering problem in calculation of conditional and mutual independence. My problem is I have...

    Started by Aseem‎, 06-04-2010 05:58 AM
    • Replies: 0
    • Views: 1,988
    06-04-2010, 05:58 AM Go to last post
  37. Checking if Critical Point Max or Min or Saddle

    How can I check if a critical point (x1,x2,...x10) for a function of 10 variables is a minimum or maximum or saddle? There is a lot of...

    Started by Valen‎, 02-04-2011 05:42 PM
    • Replies: 0
    • Views: 3,650
    02-04-2011, 05:42 PM Go to last post
  38. Chernoff Faces Taken Seriously?

    Often I come across web articles or books mention Chernoff faces as a way to efficiently express multivariate data with up to 10 different numeric...

    Started by trinker‎, 08-04-2011 11:28 AM
    • Replies: 1
    • Views: 2,821
    08-04-2011, 11:37 AM Go to last post
  39. 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: 4,556
    03-14-2013, 01:37 AM Go to last post
  40. Chi sqared test or fisher exact test?

    Hi, I am doind research on different treatments to a disease. I broke down the categories into different age groups, i.e. 5-10,11-15,16-20 etc. and...

    Started by bullethead05‎, 04-10-2012 04:35 PM
    • Replies: 4
    • Views: 2,246
    04-10-2012, 07:13 PM Go to last post
  41. Chi Square - confused which variables to use.

    Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

    Started by Bluerosebowl‎, 11-04-2011 04:52 PM
    • Replies: 4
    • Views: 3,130
    11-14-2011, 08:38 AM Go to last post
  42. Chi square contingency table error!

    From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

    Started by kenshi64‎, 02-26-2012 07:50 AM
    • Replies: 2
    • Views: 1,665
    02-26-2012, 08:52 AM Go to last post
  43. Chi Square for Likert Scale in Single Sample

    Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5...

    Started by smithtl68‎, 01-07-2014 08:10 PM
    chi square, cluster randomized, hypotheisis testing, likert scale, null hypothesis
    • Replies: 3
    • Views: 9,580
    01-23-2014, 10:18 AM Go to last post
  44. Chi square test for ordinal variables

    Hey all, I have a question regarding the chi-square statistics. I have a total sample size of more than 4,000 and I have 2 groups (2 different...

    Started by proefkonijn‎, 06-02-2012 01:39 PM
    • Replies: 3
    • Views: 4,032
    06-03-2012, 04:38 AM Go to last post
  45. chi square test to test difference for 5x2

    My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

    Started by fengyuwuzu‎, 04-27-2016 07:04 PM
    • Replies: 1
    • Views: 1,483
    04-27-2016, 07:47 PM Go to last post
  46. chi test duplication from a research

    Exactly what i need. I need to duplicate a research and get their same answers using a 2 prop z test or chi test and i'm having issues... can't go on...

    Started by saraservis‎, 05-09-2010 10:14 AM
    • Replies: 1
    • Views: 2,073
    05-09-2010, 07:50 PM Go to last post
  47. chi-square

    I need to know if severely (all 52) depressed women more/less likely to commit violent /other crimes. How can I do Chi-Square with Fisher Exact Stat...

    Started by eunkum1‎, 04-10-2014 01:43 PM
    • Replies: 2
    • Views: 1,018
    04-10-2014, 05:09 PM Go to last post
  48. chi-square assumptions with survey data

    Hi guys, I've been asked to run some analyses on some survey data and since it's been a long time since i ran one, I just wanted to check I'm not...

    Started by Elysse‎, 03-09-2011 07:56 PM
    assumptions, chi-squared, survey
    • Replies: 1
    • Views: 2,878
    03-10-2011, 02:10 AM Go to last post
  49. 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: 4,270
    01-13-2011, 05:04 AM Go to last post
  50. Chi-square iinterpretation research project

    Hi Folks, For my uni research I'm doing a chi-square analysis. Basically what I'm comparing are 2 different medication groups. I'm comparing these...

    Started by marcel1‎, 04-26-2012 10:06 AM
    • Replies: 2
    • Views: 1,172
    05-07-2012, 04:15 PM Go to last post
  51. Chi-square influential categories

    I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

    Started by bioniclime‎, 10-27-2014 12:05 PM
    chi-square test, influence
    • Replies: 3
    • Views: 1,663
    10-27-2014, 03:55 PM Go to last post
  52. Chi-square instead of Multiple Regression Analysis

    Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

    Started by choco21lit‎, 05-21-2016 11:45 AM
    • Replies: 0
    • Views: 869
    05-21-2016, 11:45 AM Go to last post
  53. chi-square post-hoc tests?

    Hi there, I've been searching the forum and elsewhere to figure out how to interpret my chi-square results and I can't find anything that relates to...

    Started by mogetons‎, 04-13-2011 03:13 PM
    • Replies: 4
    • Views: 15,548
    04-16-2011, 02:54 PM Go to last post
  54. Chi-square test

    Hi all, I'm new here and am doing some research and am certainly not a statistician. Basically I have a dataset with patients who have reported drug...

    Started by fred_1‎, 06-28-2011 04:22 PM
    • Replies: 5
    • Views: 3,304
    07-13-2011, 06:58 AM Go to last post
  55. chi-square test for nested models

    Consider 2 models A and B. A (5 free parameters) is nested within B (6 free parameters). Imagine that we do an experiment and acquire data from N =...

    Started by mathieu‎, 08-24-2016 03:26 PM
    chi-square test, nested models
    • Replies: 2
    • Views: 1,448
    08-25-2016, 11:00 PM Go to last post
  56. chi-square test of independence sig but all post-hoc not--how to report?

    I am conducting chi-square tests of independence and for any that are significant I am conducting Bonferroni adjusted post-hoc tests. I have a couple...

    Started by m.hawkins‎, 06-26-2015 01:19 PM
    chi-square, post-hoc, reporting results
    • Replies: 1
    • Views: 1,007
    06-26-2015, 01:22 PM Go to last post
  57. chi-square with small sample size

    I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

    Started by fishystats‎, 05-19-2011 10:39 PM
    • Replies: 6
    • Views: 8,972
    05-20-2011, 12:24 PM Go to last post
  58. Chi-square?

    I have one experimental group (n=15) and one control group (n=13) and I would like to compare the number of fallers in each group post intervention....

    Started by pcastro‎, 01-26-2011 07:10 AM
    • Replies: 0
    • Views: 2,228
    01-26-2011, 07:10 AM Go to last post
  59. Chi-squared test with yes/no data

    Hi I am having trouble working out how to do a chi-square test in minitab for purely yes no data. These are my only variables and I want to find...

    Started by VickyTreg‎, 03-05-2014 11:49 AM
    • Replies: 1
    • Views: 2,578
    03-05-2014, 11:56 AM Go to last post
  60. Choice of analysis method and variable skew

    Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

    Started by DrDogg‎, 02-13-2012 05:18 PM
    • Replies: 2
    • Views: 1,988
    02-14-2012, 02:30 PM Go to last post

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