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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: 11,679
    10-11-2014, 12:02 PM Go to last post
  1. 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, Today 11:22 AM
    correlation, correlation analysis
    • Replies: 0
    • Views: 43
    Today, 11:22 AM Go to last post
  2. Question help needed urgently for my dissertation what analysis method do i use

    hi i urgently need some help to do results section of my dissertation as it due soon by early may what analysis do i use and how do i interpret...

    Started by psychelp‎, Today 09:08 AM
    please help me on this
    • Replies: 0
    • Views: 39
    Today, 09:08 AM Go to last post
  3. Hotelling's T2 test and chi2 distributions

    For the 1-2 weeks I've been trying to decompose the T2 statistic into two independent chi2-distributed statistics, but have had no success. I'm...

    Started by MikeC‎, Yesterday 01:34 PM
    • Replies: 0
    • Views: 82
    Yesterday, 01:34 PM Go to last post
  4. how it comes Exact sig = 1

    hello, please help me to intrepret the Mann whitney output figuring in the picture bellow.And especially if the (exact sig = 1) is coorect ? ...

    Started by ilyes‎, 04-22-2017 06:02 AM
    • Replies: 0
    • Views: 124
    04-22-2017, 06:02 AM Go to last post
  5. SPSS Correlation of single variable and independent variables

    Hello, I am working in spss 23 and I'm stuck. I have data for which I am attempting to determine if certain color of a personality (there are 4...

    Started by kellytwilliams‎, 04-21-2017 11:01 AM
    correlation analysis, spss 23
    • Replies: 3
    • Views: 146
    04-22-2017, 02:48 AM Go to last post
  6. Statistical report

    Hi, I am a first-year business student that is taking a stats class. I have a report assignment with the requirement of an executive survey and...

    Started by Sam1218‎, 04-16-2017 09:17 PM
    descriptive statistics, executive summary, graphical representation, inferential statistics, statistical report
    • Replies: 0
    • Views: 175
    04-16-2017, 09:17 PM Go to last post
  7. Can I use an independent t-test to test for significant differences over time?

    I have a 50 year time series (2012-2062), and I would like to test to see whether sig. differences exist between two groups of data subjected to...

    Started by Miz123‎, 04-15-2017 08:20 AM
    t-test
    • Replies: 0
    • Views: 153
    04-15-2017, 08:20 AM Go to last post
  8. GOF measures

    When we validate a statistical model, should we only consider the traditional Goodness-Of-Fit measures? Are there other ways in which the model...

    Started by shane414‎, 04-14-2017 03:09 AM
    • Replies: 1
    • Views: 157
    04-14-2017, 10:48 AM Go to last post
  9. GOF Analysis/Discussion

    What actions constitute an analysis of goodness-of-fit for a regression model? What are the typical graphical displays used in this analysis of...

    Started by shane414‎, 04-14-2017 02:54 AM
    regression analysis
    • Replies: 1
    • Views: 111
    04-14-2017, 10:33 AM Go to last post
  10. Dealing with censored dates as regressors

    I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

    Started by nbi‎, 03-30-2017 07:30 AM
    censoring, regression, time-series
    • Replies: 2
    • Views: 196
    04-13-2017, 11:31 AM Go to last post
  11. [ANOVA - Repeated Measures] When to include subject as a random effect?

    I have an eye tracking study in which two groups of subjects (patient and control) are completing a face recognition task in which they learn a set...

    Started by ProfCorrow‎, 03-10-2017 12:26 PM
    random effect, repeated measures anova
    • Replies: 2
    • Views: 378
    04-11-2017, 12:00 PM Go to last post
  12. Regression Analysis

    I'm trying to better understand linear regression by the following questions. (1) Linear regression assumes: a. The relationship between X...

    Started by msoe414‎, 04-07-2017 04:49 AM
    statistics help
    • Replies: 5
    • Views: 394
    04-07-2017, 10:35 PM Go to last post
  13. How to best maximize sample size for a third order factor CFA

    Dear all, I have a sample size question that I'd like to consult your opinions on. In our lab, we gave a particular measure to roughly 450...

    Started by myautumn28‎, 04-07-2017 10:34 AM
    • Replies: 0
    • Views: 156
    04-07-2017, 10:34 AM Go to last post
  14. Advantages/disadvantages of computing composite score these ways

    Hi, I'd highly appreciate your recommendations for a research I'm doing. More specifically, I'd like to know the advantages, disadvantages, and...

    Started by StatTalker‎, 04-03-2017 08:05 AM
    • Replies: 2
    • Views: 305
    04-04-2017, 02:18 AM Go to last post
  15. comparing section in a scale using spss

    Hi everyone; hope you are doing well, I am actually conducting a research, and I am comparing between a pre and post scale. my problem is that...

    Started by rukia‎, 03-24-2017 07:54 AM
    • Replies: 4
    • Views: 343
    04-02-2017, 09:55 PM Go to last post
  16. how do we estimate regression parameters in survival analysis

    Dear All, I would like to ask how to estimate regression parameters(Beta) in Accelerated Failure Time Model? Does anybody knows any resources?...

    Started by masarimk‎, 03-25-2017 11:58 PM
    • Replies: 3
    • Views: 390
    04-02-2017, 10:43 AM Go to last post
  17. Is survey design statistically correct?

    I want to track improvements in how yoga class participants feel on various variables (e.g. energy level, sleep quality, pain felt, mental...

    Started by johnsif‎, 03-30-2017 02:47 AM
    • Replies: 8
    • Views: 349
    04-02-2017, 10:33 AM Go to last post
  18. Smile Which test to use?

    I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

    Started by sf27‎, 04-01-2017 03:26 AM
    • Replies: 0
    • Views: 194
    04-01-2017, 03:26 AM Go to last post
  19. Selecting of statistical test?

    I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

    Started by sf27‎, 04-01-2017 03:20 AM
    chi square, statistic test, t-test
    • Replies: 0
    • Views: 83
    04-01-2017, 03:20 AM Go to last post
  20. Meta-analysis - Can I investigate mediation effects for the effectiveness of training

    Hello everyone, I am currently working on my Master thesis on moderators and mediators for the effectiveness of cross-cultural training (CCT). I...

    Started by ChristinaK91‎, 03-25-2017 11:34 AM
    mediating effect, mediator, meta-analysis
    • Replies: 0
    • Views: 251
    03-25-2017, 11:34 AM Go to last post
  21. Factor analysis with multiple constructs

    Hi all, Have a question related to factor analysis and how to execute it. For instance, in a survey you measure 3 seperate constructs, and use 5...

    Started by cs_ut‎, 03-23-2017 09:28 AM
    • Replies: 2
    • Views: 260
    03-24-2017, 08:36 AM Go to last post
  22. reverse causality and endogeneity problems

    Hi all, I am trying to analyse the effect of the sex of a CEO (female vs male) on a performance measure of two types of firms (Conglomerate and...

    Started by a_dabch‎, 03-15-2017 04:25 PM
    • Replies: 1
    • Views: 406
    03-23-2017, 12:55 PM Go to last post
  23. Alternatives for Non-normality and Inequality of Variance?

    I've been working with a rather difficult data set for over a week with no real progress. I am trying to compare the effect of temperature (15, 20,...

    Started by nebulus‎, 03-17-2017 11:04 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 873
    03-22-2017, 07:22 AM Go to last post
  24. How to combine correlated vector-valued estimates

    I'd like to combine several vector-valued estimates of a physical quantity in order to obtain a better estimate with less uncertainty. As in the...

    Started by WhiteHaired‎, 03-21-2017 05:50 AM
    combine estimates, correlated estimates, uncertainty propagation, vector-valued estimates, weighted mean
    • Replies: 1
    • Views: 219
    03-21-2017, 03:03 PM Go to last post
  25. Interpreting CFA Output

    I have recently been performing confirmatory factor analysis to assess model fit for an established measure, the measure has previously been...

    Started by RPortman7‎, 03-20-2017 07:33 AM
    cfa, dataanalysis
    • Replies: 0
    • Views: 239
    03-20-2017, 07:33 AM Go to last post
  26. Data Collection

    I am an education major and am lost in my research class! I have the research question of, "How does classical music playing in the background...

    Started by GradStudent17‎, 03-15-2017 06:53 AM
    • Replies: 1
    • Views: 325
    03-15-2017, 07:28 AM Go to last post
  27. What specific type of GLM to use?

    I'm trying to figure out what type of distribution (Poisson or binomial) to use to measure differences in proportions using logistic glm. Basically I...

    Started by atamalu‎, 03-12-2017 06:25 PM
    • Replies: 2
    • Views: 341
    03-13-2017, 04:52 PM Go to last post
  28. clasiffy - weka

    can I use cfs setset evaluator /greedy stepwise for correlated? Which attributes seem to be most linked to the class attribute? how do understand...

    Started by raju1‎, 03-12-2017 04:33 PM
    • Replies: 0
    • Views: 190
    03-12-2017, 04:33 PM Go to last post
  29. Bayesian analog to Generalized Estimating Equations?

    GEE2 (second order generalized estimating equations, see Prentice and Zhao 1991 Biometrics) can be used to model the mean and covariance of a...

    Started by jaron003‎, 03-10-2017 04:00 PM
    • Replies: 1
    • Views: 336
    03-11-2017, 10:46 AM Go to last post
  30. Anova?

    Hi I have a question regarding statistical tests. Assume that I have to run a program 5 times (5 iterations) and each time it gives me some...

    Started by Basemah‎, 03-10-2017 06:38 PM
    • Replies: 0
    • Views: 277
    03-10-2017, 06:38 PM Go to last post
  31. How to compare R2 across three independent samples?

    Is it possible to compare an R2 value across three independent samples? I am familiar with the Fisher r to z test, but this is only for correlation...

    Started by newbie8888‎, 03-07-2017 01:00 PM
    anova, regression
    • Replies: 0
    • Views: 360
    03-07-2017, 01:00 PM Go to last post
  32. statistical inference in materials science

    Hi all, I'm currently doing a quick study into a material where grain size could potentially affect a desired property Y, but I'm uncertain about...

    Started by dhvd90‎, 03-07-2017 12:17 PM
    • Replies: 0
    • Views: 220
    03-07-2017, 12:17 PM Go to last post
  33. Experimental design: ANOVA? help!

    Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

    Started by Arwen82‎, 02-26-2017 02:18 PM
    • Replies: 3
    • Views: 476
    03-05-2017, 09:09 AM Go to last post
  34. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 1,449
    03-03-2017, 01:48 PM Go to last post
  35. Analysing Limited Data

    Help! For my thesis I involuntary have a small dataset due to a limited population. I was thinking about analysing this data with the statistical...

    Started by IngevanderBorg‎, 03-03-2017 06:52 AM
    anova, bayesian analysis, nonparametric, small data set
    • Replies: 0
    • Views: 259
    03-03-2017, 06:52 AM Go to last post
  36. Anova with data reduction? (Experimental design)

    Hi, this is my first post, I hope to do nothing wrong like posting in the wrong area.:pag It happens that I did an experiment where I have a...

    Started by Bardock‎, 03-01-2017 08:59 AM
    anova observations, data, data analysis, reduction os data
    • Replies: 4
    • Views: 485
    03-03-2017, 01:37 AM Go to last post
  37. Finding my control group PSM, Matching or regression model and correct for confounder

    Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

    Started by Longo‎, 03-01-2017 01:43 PM
    confounders, control group, help needed, matching, regression model
    • Replies: 3
    • Views: 453
    03-02-2017, 09:41 PM Go to last post
  38. Correcting alpha for multiple anovas

    Hi! I have 7 different properties, all independent, that are being mesured. Each property has a control and three disease groups. All independent....

    Started by Szkeptik‎, 02-25-2017 03:30 PM
    • Replies: 1
    • Views: 488
    03-02-2017, 01:38 PM Go to last post
  39. Statistic test for comparing time budget?

    Hi all I am a beginner in statistics and I have the following difficulty. I video-recorded some animals in two populations and I calculated...

    Started by Christinec‎, 03-02-2017 03:44 AM
    • Replies: 1
    • Views: 460
    03-02-2017, 11:20 AM Go to last post
  40. ANOVA or t-test?

    I want to test 2 different treatments (diets), repeating each treatment 3 times on 25 individuals independent samples. After each repetition, four...

    Started by marloncalispa‎, 02-20-2017 12:23 PM
    anova, t-test
    • Replies: 2
    • Views: 632
    03-01-2017, 12:20 PM Go to last post
  41. Select two variables with values closest to 50 among 5 variables

    I have a problem regarding the analysis of a big dataset, that I can't seem to tackle by myself! Help would be really appreciated: This is the...

    Started by tastea‎, 03-01-2017 09:41 AM
    • Replies: 0
    • Views: 250
    03-01-2017, 09:41 AM Go to last post
  42. Dealing with unknown dependencies between variables

    Hi! I have a system where I'm studying 3 different diseases, however they share some pathological similarities. There is no data on them being...

    Started by Szkeptik‎, 02-26-2017 08:31 AM
    • Replies: 2
    • Views: 679
    02-26-2017, 10:51 PM Go to last post
  43. Exclamation Need help selecting appropriate test

    I'm currently trying to select the appropriate significance test and test of association and would really appreciate some help. My independent...

    Started by geosfranklin‎, 02-26-2017 02:38 PM
    chi sq test, ordinal and categorical
    • Replies: 0
    • Views: 371
    02-26-2017, 02:38 PM Go to last post
  44. Stats Help please...

    Hi, I'm not the best at stats so please keep terms and approaches in layman's terms please - I currently use SPSS too :) I'm not too sure which...

    Started by JD823‎, 02-24-2017 11:53 AM
    • Replies: 0
    • Views: 407
    02-24-2017, 11:53 AM Go to last post
  45. Poisson Distribution

    Hi, I am using the Poission distribution to calculate probabillity for x = X. Poisson distribution is skewed to the right when lambda is small....

    Started by samot79‎, 02-08-2017 08:21 AM
    • Replies: 7
    • Views: 763
    02-20-2017, 05:07 AM Go to last post
  46. obtain inter-aarival from bulk arrival

    I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

    Started by mohsenhs82‎, 02-16-2017 05:22 PM
    2 Pages
    1 2
    arrival time, probabilities, queuing theory, random variable, stochastic
    • Replies: 16
    • Views: 1,116
    02-19-2017, 05:24 PM Go to last post
  47. Help with confirming what I can and cannot conclude from this regression output

    This study tried to determine the factors influencing the probability that voters would be asked to show ID in order to vote in a certain state...

    Started by Harry717‎, 02-18-2017 12:14 PM
    • Replies: 1
    • Views: 389
    02-19-2017, 04:55 PM Go to last post
  48. Help with master thesis method for analysis, first time quantitative research

    Deleted because of serious flaw in question asked. Will edit with an update

    Started by seaturtle‎, 02-17-2017 07:10 PM
    • Replies: 0
    • Views: 583
    02-17-2017, 07:10 PM Go to last post
  49. Smile What model to use?

    Hi, I'm currently doing a piece of research that requires statistical analysis however this is very out of my comfort zone and I am unsure of what...

    Started by jmht‎, 02-17-2017 08:23 AM
    pattern
    • Replies: 2
    • Views: 550
    02-17-2017, 04:14 PM Go to last post
  50. Sample size determination for ANOVA / KRUSKAL WALIS

    Hi! I need help with my dissertation regarding sample size calculation. I will be grateful if anybody can help me out with this... My study...

    Started by janicedsa‎, 02-16-2017 11:04 PM
    sample size
    • Replies: 0
    • Views: 442
    02-16-2017, 11:04 PM Go to last post
  51. 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: 556
    02-13-2017, 04:50 AM Go to last post
  52. is my concept of averaging averages under this scenario wrong?

    hi all, I'm confused on the concept of whether or not to average the averages under this scenario, when the data collected are from different...

    Started by stat newbie L‎, 02-11-2017 04:48 AM
    averaging averages
    • Replies: 0
    • Views: 537
    02-11-2017, 04:48 AM Go to last post
  53. Correlation length

    Hi all, I'm working on a hydrological model. I supposed to build a mesh with correlation length in the permeability field. I know what is the...

    Started by Evyatar‎, 02-02-2017 04:14 AM
    correlation, correlation length
    • Replies: 7
    • Views: 1,050
    02-08-2017, 10:34 AM Go to last post
  54. Theoretical Regression Problems

    What is the term for when your outcome variable is truncated and that may be dampening your results? For example, you use a dichotomous outcome for...

    Started by kmed‎, 02-06-2017 03:52 PM
    • Replies: 11
    • Views: 728
    02-07-2017, 09:52 AM Go to last post
  55. Medical Device Testing (CV%)

    Hi all, looking for a bit of help. I have a number of medical devices to test, 150 to be precise. Two levels of sample to test on each device. I...

    Started by mattjdenmead‎, 02-04-2017 12:07 PM
    • Replies: 0
    • Views: 556
    02-04-2017, 12:07 PM Go to last post
  56. Wink Stuck with my darn P value

    Hey guys So I've been doing some medical research and I have a great result by no idea how to approach working out the P value. Basically with...

    Started by PKrazda‎, 01-26-2017 12:24 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 3,668
    02-03-2017, 03:02 PM Go to last post
  57. Help understanding separate- and joint- factor analyses in CFA and ESEM

    Folks, I am reading an article that tested 2 models--one with an hypothesized separate-factor relationship between five pairs of personality...

    Started by barrygrant‎, 02-02-2017 01:24 PM
    cfa, esem, factor analysis
    • Replies: 2
    • Views: 708
    02-03-2017, 10:43 AM Go to last post
  58. HELP: Using Data on Different Spatial Scales for Econometric Regressions

    *Background: Using a Production Function in form of Autoregressive Regression Model for Regional Perfomance* Hi, This question is more of a...

    Started by dave_123‎, 02-03-2017 03:06 AM
    dataset, econometric, regression, scale, spatial
    • Replies: 0
    • Views: 470
    02-03-2017, 03:06 AM Go to last post
  59. How to rank factors of a confirmatory factor analysis?

    Hey there, within my current study I would like to determine the importance of different behavioral intentions. Since behavioral intentions are...

    Started by Fk2803‎, 01-30-2017 05:52 PM
    • Replies: 0
    • Views: 526
    01-30-2017, 05:52 PM Go to last post
  60. Unsure of which statistical method to use- Please help!

    Hello, I'm writing a research proposal but I don't have a strong background in statistics. It would be great if someone can let me know which...

    Started by macjkk‎, 01-30-2017 12:01 AM
    • Replies: 2
    • Views: 742
    01-30-2017, 04:24 PM Go to last post

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