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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: 18,756
    10-11-2014, 12:02 PM Go to last post
  1. A Non parametric equivelent to mixed anova?

    Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

    Started by Elaine98‎, 08-14-2010 07:33 AM
    • Replies: 1
    • Views: 5,118
    08-14-2010, 09:36 AM Go to last post
  2. 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: 2,723
    09-17-2014, 07:09 AM Go to last post
  3. Help with research

    I will start by saying statistics is not my strong point so any help is greatly appreciated. I would like advice on methods to analyze the data I...

    Started by ELAPIERRE‎, 04-07-2013 04:05 PM
    • Replies: 1
    • Views: 1,071
    04-07-2013, 04:22 PM Go to last post
  4. MSE in GLM ANOVA

    Sorry for the wall of text, but I'm trying to figure out how to proceed and feel as though I need to clue you in as best I can. Experimental...

    Started by elduderino260‎, 11-16-2015 08:20 PM
    • Replies: 3
    • Views: 1,296
    11-17-2015, 01:29 PM Go to last post
  5. How to correct negative skew

    My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

    Started by elf212‎, 07-21-2010 08:20 PM
    • Replies: 2
    • Views: 8,152
    07-23-2010, 05:03 PM Go to last post
  6. Post Transforming data

    Hi, I did General linear model using SPSS and i do not have homogeneity of variances, How i can solve this problem? DO i need to transformmy...

    Started by Elhama‎, 01-30-2015 06:37 PM
    • Replies: 0
    • Views: 1,321
    01-30-2015, 06:37 PM Go to last post
  7. Question Question about correlation and regression using entire ppopulation

    Hi, I am working on a project were I am doing an analysis on the relationship between two metric variables on a county level in the United States....

    Started by elias2001‎, 10-30-2011 05:23 PM
    correlation, population, regression analysis
    • Replies: 1
    • Views: 1,595
    10-30-2011, 06:35 PM Go to last post
  8. Correlation matrix Not positive definite in PCA

    Hi, I am currently working on a project which returns a not positive matrix while conducting a PCA. As a result I don't get the sphericity test...

    Started by Elina‎, 11-01-2013 08:27 AM
    • Replies: 0
    • Views: 1,421
    11-01-2013, 08:27 AM Go to last post
  9. Principal Component Analysis in SPSS

    Hi, I have two main issues with SPSS. 1. I am currently trying to run a PCA in SPSS with 120 variables and 60 respondents (likert scale data)....

    Started by Elina‎, 10-30-2013 11:13 AM
    • Replies: 0
    • Views: 3,396
    10-30-2013, 11:13 AM Go to last post
  10. What statistic to use?

    I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

    Started by elisayoung‎, 04-27-2009 07:19 PM
    • Replies: 1
    • Views: 3,436
    04-28-2009, 01:13 AM Go to last post
  11. Exclamation Quasi-experiments and variable manipulation

    Hello, I am new here so forgive me if I seem amateur, After doing a lot of research and discussion with other students I have continued to find...

    Started by elle_‎, 09-08-2016 12:25 AM
    design of experiments, independ variable, manipulation, quasi-experimental, statisitcs
    • Replies: 0
    • Views: 1,254
    09-08-2016, 12:25 AM Go to last post
  12. Two Variables, Many Components :( Type 1 Error?

    Hey, Have spent ages trawling through the threads before I decide I would have to bother everyone with yet another question from a dissertation...

    Started by Elle_Belle‎, 03-28-2009 09:11 AM
    • Replies: 0
    • Views: 2,671
    03-28-2009, 09:11 AM Go to last post
  13. dealing with unequal sample sizes... can anyone help please?

    Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

    Started by ellie_w‎, 11-17-2014 10:10 AM
    representativeness, unequal sample sizes
    • Replies: 7
    • Views: 2,523
    11-18-2014, 04:14 AM Go to last post
  14. McNemar's test post-hoc power analysis problem when odds ratio=0

    I need to do post-hoc power analysis for a McNemar's test (using G*power), and am having trouble getting results. One of the discordant pairs is 0,...

    Started by elmorem‎, 02-04-2015 01:03 PM
    mcnemar's test, odds ratio, post-hoc, power analysis, power calculation
    • Replies: 1
    • Views: 2,287
    02-04-2015, 01:13 PM Go to last post
  15. Is t-test appropriate for comparing percentages?

    I am trying to analyze a seed germination trial comparing 2 different germination treatments. I sowed seeds from 10 individual plants in 10...

    Started by elmorem‎, 03-25-2015 09:04 PM
    binary data, comparing percentages, comparing rates, t-test
    • Replies: 1
    • Views: 1,300
    03-29-2015, 05:57 AM Go to last post
  16. Threshold Autoregressive (TAR) Model with exogenous variables (TARX)

    Anyone have experience with these models? From what I remember about VAR is that adding exogenous variables to model a VARX is straightforward....

    Started by ELMST‎, 05-02-2016 07:42 PM
    tar, tarx, var, varx
    • Replies: 0
    • Views: 793
    05-02-2016, 07:42 PM Go to last post
  17. EM algorithm

    Hello can you help me? I require a program for estimate of parameters in density of mixture exponential With EM algorithm . Thank you for your...

    Started by elnaz‎, 04-09-2006 03:44 PM
    • Replies: 0
    • Views: 3,592
    04-09-2006, 03:44 PM Go to last post
  18. Help needed with choice of appropriate method for repeated measures data

    Hello! I'm new on this forum and I'm desperately searching for advice on analyzing my data. I'm currently working on my master's thesis and I'm...

    Started by Elvin Roest‎, 08-02-2011 04:35 AM
    • Replies: 0
    • Views: 1,506
    08-02-2011, 04:35 AM Go to last post
  19. Linear Mixed Models in SPSS for repeated measures

    I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

    Started by Elvin Roest‎, 08-04-2011 05:16 PM
    • Replies: 13
    • Views: 12,669
    08-08-2011, 04:38 AM Go to last post
  20. 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: 4,405
    09-11-2012, 12:23 PM Go to last post
  21. 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: 2,879
    03-10-2011, 02:10 AM Go to last post
  22. Post MANOVA and MANCOVA - Help needed

    I have collected data with one Independent Variable (two levels - nominal) and 4 dependent variables (all scale - continuous). I decided to do a...

    Started by Em19133‎, 01-01-2017 05:29 PM
    • Replies: 0
    • Views: 2,402
    01-01-2017, 05:29 PM Go to last post
  23. Justification for Levene's test?

    Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

    Started by emily.stats‎, 11-22-2012 09:31 AM
    • Replies: 7
    • Views: 3,061
    11-28-2012, 06:27 AM Go to last post
  24. BLUP of a specific difference is biased

    Can anyone explain how BLUPs can be unbiased but the BLUP of of a difference is biased. I have found this statement in numerous papers eg Smith,...

    Started by emily.stats‎, 09-04-2013 07:45 AM
    • Replies: 1
    • Views: 1,192
    09-05-2013, 04:32 AM Go to last post
  25. Can I perform logistical regression on a sample of 28

    Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

    Started by EmilyC‎, 02-07-2012 11:17 AM
    • Replies: 1
    • Views: 1,497
    02-07-2012, 11:48 AM Go to last post
  26. Exclamation Which test to use?!?! PLEASE HELP!

    Hi everyone! I have a quick question to ask and quite frankly im slightly confused (maybe because ive over complicated everything in my...

    Started by Emma201‎, 05-16-2014 07:50 AM
    • Replies: 2
    • Views: 1,599
    05-19-2014, 12:18 PM Go to last post
  27. HMLR and ANOVAs instead of structural equation modelling

    Hi,* I have two studies within my thesis; The first is cross-sectional, and tests a theoretical framework of leadership - it explores the...

    Started by EmmaL‎, 06-06-2017 03:15 PM
    • Replies: 0
    • Views: 602
    06-06-2017, 03:15 PM Go to last post
  28. Analysis for different data scales

    Hello everyone. I have a question that how can I perform regression/correlation or hypotheses testing on a data which has different response...

    Started by emmasood‎, 07-19-2017 09:17 AM
    • Replies: 0
    • Views: 312
    07-19-2017, 09:17 AM Go to last post
  29. ANOVA help? :)

    Basically i have two sets of data collected from two different locations. I know that both sets of data are not normally distributed, so they will...

    Started by EmmaWP‎, 02-13-2013 05:11 PM
    • Replies: 5
    • Views: 1,129
    02-13-2013, 05:32 PM Go to last post
  30. Data collection

    Hi everyone, i have a simple question that i actually cant get my head around (have been working on this assignment far to long and hard!) The...

    Started by emmayo‎, 08-05-2013 11:39 PM
    • Replies: 0
    • Views: 983
    08-05-2013, 11:39 PM Go to last post
  31. Poll Poll: Ordinal or continuous scale?

    Hello, I have carried experiments where the participants were asked to rate a parameter on a scale. The scale starts from “not heavy” to “heavy”;...

    Started by emmenru‎, 03-23-2015 05:57 AM
    • Replies: 0
    • Views: 1,060
    03-23-2015, 05:57 AM Go to last post
  32. Reporting effect size/post hocs when not significant- rigorous alpha

    Hello, I have received my manuscript back from reviewers who have suggested that I report Cohen's d for differences found between three groups. ...

    Started by emofield‎, 07-31-2016 09:22 PM
    • Replies: 1
    • Views: 1,125
    08-01-2016, 08:08 AM Go to last post
  33. Help please!

    Hi, im new to this forum and i am a psychology student who is in the middle of my dissertation and it has reached the point that i need to start my...

    Started by Ems86‎, 03-25-2009 03:16 PM
    • Replies: 1
    • Views: 1,631
    03-25-2009, 11:08 PM Go to last post
  34. Determining which data set is most like another

    I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

    Started by EMStelley‎, 04-26-2012 12:23 PM
    chi-squared, multivariate data sets
    • Replies: 6
    • Views: 1,757
    04-27-2012, 02:08 PM Go to last post
  35. How many tests?

    Hi, I am trying to bridge a new reagent with an existing one so when the existing one runs out I can use the new one. I want to test the old and...

    Started by Emuk81‎, 08-06-2014 09:05 AM
    • Replies: 1
    • Views: 1,124
    08-06-2014, 09:10 AM Go to last post
  36. Paired Vs unpaired t-test - which one to use?

    Good morning, I am a little stuck - I understand the difference between the two tests and am happy with written examples in a stats book I found....

    Started by Emuk81‎, 08-18-2014 03:58 AM
    • Replies: 1
    • Views: 2,784
    08-18-2014, 07:12 AM Go to last post
  37. which distribution fits...

    Hi I am working on some data describing people arrival at the bus station. For example 08.00-08.10 at the station arrived 9 people/min...

    Started by endri81‎, 07-15-2011 10:26 AM
    • Replies: 2
    • Views: 1,706
    07-15-2011, 11:06 AM Go to last post
  38. Public Transport Model

    Hi. I am working on statistical model about people waiting time for city bus. Actually I cannot count all people who go in and out from bus in...

    Started by endri81‎, 07-26-2011 11:46 AM
    • Replies: 0
    • Views: 1,789
    07-26-2011, 11:46 AM Go to last post
  39. Markov Processes

    How to proof that in every markov process time between 2 arrivals is exponential ? best regards

    Started by endri81‎, 08-08-2011 12:49 AM
    • Replies: 0
    • Views: 1,623
    08-08-2011, 12:49 AM Go to last post
  40. Hypothesis about bus arrivals distribution

    Hi I have collected data in the bus stop registering bus arrival times. Now I want to find the distribution that fits to this data. Trying in...

    Started by endri81‎, 01-20-2012 02:35 PM
    • Replies: 1
    • Views: 2,197
    01-20-2012, 03:52 PM Go to last post
  41. Normal distribution...

    Hi. In many examples I have seen that service time for passengers (time between 2 bus arrivals) is modeled by using normal distribution. As usually...

    Started by endri81‎, 04-03-2012 04:32 AM
    • Replies: 0
    • Views: 1,642
    04-03-2012, 04:32 AM Go to last post
  42. Question How to calculate test reliability with different exam versions

    Hello All, I'm new to this forum and this is my first questions. We have 1500 students and each student will receive a test that has 30...

    Started by engalnoor‎, 04-12-2013 04:16 PM
    reliability
    • Replies: 0
    • Views: 1,313
    04-12-2013, 04:16 PM Go to last post
  43. Scientific articles about statistics

    I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

    Started by Englund‎, 03-14-2013 03:28 PM
    • Replies: 2
    • Views: 2,763
    03-14-2013, 03:49 PM Go to last post
  44. P-value plots

    If anyone know any good paper or other resource that gives an introduction to p-value plots, I'd greatly appreciate if you could share it.

    Started by Englund‎, 04-24-2013 07:05 PM
    • Replies: 2
    • Views: 1,575
    04-25-2013, 01:51 AM Go to last post
  45. I.I.D assumption of T-test

    I am writing my second master's thesis now and I came across a situation where V\neq{V}. So I thought I'd test whether this need to be the case in...

    Started by Englund‎, 01-14-2014 03:40 PM
    • Replies: 10
    • Views: 3,680
    01-16-2014, 02:29 PM Go to last post
  46. Balancing data

    A couple of classification (lets stick to only two groups for simplicity) models are performing better if we balance the data when there are few...

    Started by Englund‎, 05-01-2014 02:32 PM
    • Replies: 3
    • Views: 1,090
    05-02-2014, 01:18 PM Go to last post
  47. Conditional Accuracy Functions

    Based on a previous study about reaction time as a proxy for attentional constraint, we are analyzing our data using conditional accuracy functions....

    Started by EnviroEve‎, 10-18-2013 12:46 PM
    • Replies: 0
    • Views: 1,228
    10-18-2013, 12:46 PM Go to last post
  48. ANOVA with subject id's as variables?

    Hi everybody, I work in sleep research and it is usually of interest to us to compare variables between different sleep stages (wakefulness, N1,...

    Started by EnzoTaglia‎, 03-13-2012 05:10 PM
    • Replies: 6
    • Views: 2,557
    03-27-2012, 04:01 PM Go to last post
  49. Contradictory Results re. Normality Tests

    Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

    Started by eoinmc‎, 04-26-2011 10:17 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,982
    06-13-2011, 03:43 PM Go to last post
  50. Unsure of which analysis I should use. Hoping for some help!

    You will have to forgive me, I’m moderately inexperienced in this, and have been having one of those weeks where I keep questioning myself. I’m...

    Started by Eon‎, 10-07-2013 10:18 PM
    • Replies: 0
    • Views: 904
    10-07-2013, 10:18 PM Go to last post
  51. 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: 839
    07-21-2014, 02:00 AM Go to last post
  52. Interval Level

    Could anybody help with game theory in accordance to penetrating a market? Thank you for your answers!

    Started by equaglia‎, 10-08-2008 01:40 PM
    • Replies: 1
    • Views: 2,889
    10-08-2008, 02:11 PM Go to last post
  53. Question Gage R&R results to usable data

    This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section...

    Started by erica56458‎, 09-12-2016 03:58 AM
    gage r&r, precision, probability
    • Replies: 1
    • Views: 1,269
    09-12-2016, 04:21 AM Go to last post
  54. Correct test to use for research design

    Hi All, would like some opinions on the correct test to use for a pretty straight forward design: I want to examine how the effect of X on Y differs...

    Started by EricB‎, 09-21-2013 09:43 AM
    • Replies: 2
    • Views: 1,268
    09-21-2013, 10:49 AM Go to last post
  55. Interpreting Ranking Data

    I need help with the interpretation of ranking data. I should start by saying that I’m a writer/editor and have very little knowledge of statistical...

    Started by EricSchoeniger‎, 10-30-2013 08:44 AM
    • Replies: 0
    • Views: 2,946
    10-30-2013, 08:44 AM Go to last post
  56. Question Cross-estimating the independent variables to exclude outliers

    I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

    Started by erikstatman‎, 03-08-2014 08:49 AM
    modeling, outlier, regresion
    • Replies: 0
    • Views: 5,613
    03-08-2014, 08:49 AM Go to last post
  57. Strange likelihood function

    I have seen multiple instances where a strange negative log-likelihood function is used either to describe the posterior distribution of a model fit...

    Started by ErinFish‎, 07-28-2010 01:03 PM
    • Replies: 2
    • Views: 3,489
    08-04-2010, 01:34 PM Go to last post
  58. RMSEA manually

    Hello, I'm working with the trial version of a software that does not allow me to calculate the RMSEA for my CFA. Could I calculate this manually?...

    Started by ernesthor‎, 02-13-2017 04:50 AM
    • Replies: 0
    • Views: 1,506
    02-13-2017, 04:50 AM Go to last post
  59. Dissertation statistics

    Hi, I am currently writing my dissertation on long term effects of CEO successions, ie. are there any statistically significant effects on measures...

    Started by estho‎, 07-13-2009 05:21 AM
    • Replies: 0
    • Views: 1,907
    07-13-2009, 05:21 AM Go to last post
  60. Exogenous and Endogenous Variables

    How can you identify exogenous and endogenous variables from a chart that uses arrows and slings?

    Started by et4u77‎, 02-10-2010 04:04 PM
    • Replies: 1
    • Views: 4,230
    02-12-2010, 03:17 AM Go to last post

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