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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 03:56 AM
    • Replies: 14
    • Views: 9,966
    10-11-2014, 12:02 PM Go to last post
  1. 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, Today 07:54 AM
    • Replies: 2
    • Views: 44
    Today, 10:02 AM Go to last post
  2. 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, Yesterday 09:28 AM
    • Replies: 2
    • Views: 127
    Today, 08:36 AM Go to last post
  3. 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: 243
    Yesterday, 12:55 PM Go to last post
  4. 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: 555
    03-22-2017, 07:22 AM Go to last post
  5. 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: 73
    03-21-2017, 03:03 PM Go to last post
  6. 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: 103
    03-20-2017, 07:33 AM Go to last post
  7. 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: 185
    03-15-2017, 07:28 AM Go to last post
  8. 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: 206
    03-13-2017, 04:52 PM Go to last post
  9. [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 11:26 AM
    random effect, repeated measures anova
    • Replies: 1
    • Views: 193
    03-12-2017, 07:08 PM Go to last post
  10. 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: 86
    03-12-2017, 04:33 PM Go to last post
  11. 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 03:00 PM
    • Replies: 1
    • Views: 201
    03-11-2017, 09:46 AM Go to last post
  12. 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 05:38 PM
    • Replies: 0
    • Views: 150
    03-10-2017, 05:38 PM Go to last post
  13. 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 12:00 PM
    anova, regression
    • Replies: 0
    • Views: 221
    03-07-2017, 12:00 PM Go to last post
  14. 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 11:17 AM
    • Replies: 0
    • Views: 134
    03-07-2017, 11:17 AM Go to last post
  15. 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 01:18 PM
    • Replies: 3
    • Views: 313
    03-05-2017, 08:09 AM Go to last post
  16. 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 06:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 844
    03-03-2017, 12:48 PM Go to last post
  17. 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 05:52 AM
    anova, bayesian analysis, nonparametric, small data set
    • Replies: 0
    • Views: 149
    03-03-2017, 05:52 AM Go to last post
  18. 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 07:59 AM
    anova observations, data, data analysis, reduction os data
    • Replies: 4
    • Views: 263
    03-03-2017, 12:37 AM Go to last post
  19. 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 12:43 PM
    confounders, control group, help needed, matching, regression model
    • Replies: 3
    • Views: 283
    03-02-2017, 08:41 PM Go to last post
  20. 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 02:30 PM
    • Replies: 1
    • Views: 263
    03-02-2017, 12:38 PM Go to last post
  21. 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 02:44 AM
    • Replies: 1
    • Views: 257
    03-02-2017, 10:20 AM Go to last post
  22. 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 11:23 AM
    anova, t-test
    • Replies: 2
    • Views: 443
    03-01-2017, 11:20 AM Go to last post
  23. 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 08:41 AM
    • Replies: 0
    • Views: 136
    03-01-2017, 08:41 AM Go to last post
  24. 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 07:31 AM
    • Replies: 2
    • Views: 416
    02-26-2017, 09:51 PM Go to last post
  25. 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 01:38 PM
    chi sq test, ordinal and categorical
    • Replies: 0
    • Views: 222
    02-26-2017, 01:38 PM Go to last post
  26. 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 10:53 AM
    • Replies: 0
    • Views: 227
    02-24-2017, 10:53 AM Go to last post
  27. 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 07:21 AM
    • Replies: 7
    • Views: 526
    02-20-2017, 04:07 AM Go to last post
  28. 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 04:22 PM
    2 Pages
    1 2
    arrival time, probabilities, queuing theory, random variable, stochastic
    • Replies: 16
    • Views: 780
    02-19-2017, 04:24 PM Go to last post
  29. 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 11:14 AM
    • Replies: 1
    • Views: 177
    02-19-2017, 03:55 PM Go to last post
  30. 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 06:10 PM
    • Replies: 0
    • Views: 335
    02-17-2017, 06:10 PM Go to last post
  31. 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 07:23 AM
    pattern
    • Replies: 2
    • Views: 287
    02-17-2017, 03:14 PM Go to last post
  32. 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 10:04 PM
    sample size
    • Replies: 0
    • Views: 271
    02-16-2017, 10:04 PM Go to last post
  33. 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 03:50 AM
    • Replies: 0
    • Views: 348
    02-13-2017, 03:50 AM Go to last post
  34. 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 03:48 AM
    averaging averages
    • Replies: 0
    • Views: 357
    02-11-2017, 03:48 AM Go to last post
  35. 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 03:14 AM
    correlation, correlation length
    • Replies: 7
    • Views: 654
    02-08-2017, 09:34 AM Go to last post
  36. 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 02:52 PM
    • Replies: 11
    • Views: 426
    02-07-2017, 08:52 AM Go to last post
  37. 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 11:07 AM
    • Replies: 0
    • Views: 311
    02-04-2017, 11:07 AM Go to last post
  38. 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 11:24 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 2,198
    02-03-2017, 02:02 PM Go to last post
  39. 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 12:24 PM
    cfa, esem, factor analysis
    • Replies: 2
    • Views: 400
    02-03-2017, 09:43 AM Go to last post
  40. 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 02:06 AM
    dataset, econometric, regression, scale, spatial
    • Replies: 0
    • Views: 276
    02-03-2017, 02:06 AM Go to last post
  41. 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 04:52 PM
    • Replies: 0
    • Views: 297
    01-30-2017, 04:52 PM Go to last post
  42. 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, 01-29-2017 11:01 PM
    • Replies: 2
    • Views: 406
    01-30-2017, 03:24 PM Go to last post
  43. Looking for appropriate non-parametric test for 5 dependent group & small sample size

    What is the most appropriate parametric test for repeated observations for multiple dependent groups.

    Started by Zwsean‎, 01-28-2017 12:08 PM
    dependent groups, nonparametric, small sample, test
    • Replies: 1
    • Views: 439
    01-28-2017, 11:56 PM Go to last post
  44. utizing slightly different variables as 1 variable

    I am running a path model, and one of my DV's that I wish to utilize is course performance. The problem is that across my classes that are in my...

    Started by schue20‎, 01-26-2017 10:47 PM
    • Replies: 1
    • Views: 435
    01-27-2017, 02:31 PM Go to last post
  45. Problem with unequal variance

    Greetings, Ive collected some data on an office wellness program and have found mixed results between the treatment (wellness activities) and...

    Started by Luxor‎, 01-25-2017 05:57 PM
    • Replies: 1
    • Views: 424
    01-25-2017, 06:50 PM Go to last post
  46. Weighing male/female responses (30/70 distribution)

    Hi all! I've got a question. I received 617 responses to a questionnaire however, 445 of them are female (72%). There are two ways to fix this: ...

    Started by Nataschez‎, 01-25-2017 09:37 AM
    representativeness, weight
    • Replies: 1
    • Views: 369
    01-25-2017, 11:39 AM Go to last post
  47. How to obtain standard deviation of replicate experiments?

    I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

    Started by FrenzyFire‎, 01-20-2017 02:40 AM
    • Replies: 0
    • Views: 580
    01-20-2017, 02:40 AM Go to last post
  48. Statistical analysis - Work Delay - Some tests relations

    Suppouse that we have a dataframe called dataWork with data from a database. There are several variables and 2 of them are: - Delay: time...

    Started by nhansolo‎, 01-18-2017 04:33 AM
    analysis method, contrast analysis, hypothesis testing, statistical analysis, tests
    • Replies: 0
    • Views: 453
    01-18-2017, 04:33 AM Go to last post
  49. Question Comparing Intervention Groups for Students

    I am assigning interventions to student groups based on pre-test data (reading ability). I am using several different reading interventions. Our...

    Started by Educator7‎, 01-14-2017 10:00 AM
    • Replies: 0
    • Views: 594
    01-14-2017, 10:00 AM Go to last post
  50. Comparing two variable datasets

    Hello, I would like to see if two 2-dimentional datasets are the same, my data consists of two groups of xy data - the data is not linearly...

    Started by bjj‎, 01-13-2017 01:25 PM
    • Replies: 0
    • Views: 497
    01-13-2017, 01:25 PM Go to last post
  51. Constant such that correlation is zero

    Suppose that we four random variables, A, B, C, D that have the same standard deviation. Here, A, B, C, and D are chosen randomly and independently...

    Started by penguin770727‎, 01-13-2017 12:17 AM
    • Replies: 0
    • Views: 443
    01-13-2017, 12:17 AM Go to last post
  52. Dealing with regression to the mean

    If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

    Started by Palermo‎, 01-11-2017 07:10 AM
    • Replies: 4
    • Views: 590
    01-12-2017, 09:52 PM Go to last post
  53. Why does the following assumptions matter?

    When running an ANOVA we are told that certain assumptions of the test must be present for it to be applicable to the data. I never understood the...

    Started by feignfeign‎, 01-12-2017 06:24 PM
    • Replies: 0
    • Views: 412
    01-12-2017, 06:24 PM Go to last post
  54. Maximum number of groups in Kruskal Wallis one-way analysis of variance

    Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

    Started by feignfeign‎, 01-09-2017 10:02 PM
    • Replies: 5
    • Views: 607
    01-12-2017, 06:14 PM Go to last post
  55. What would be the appropriate statistical tool?

    Dear all, I am a graduate researcher in the analysis phase of my research work. My research is an intervention research (n=14) trying to analyze the...

    Started by Jerrome‎, 01-10-2017 03:35 PM
    binary varibles, likert sacle, normality, t-test
    • Replies: 3
    • Views: 527
    01-11-2017, 05:17 AM Go to last post
  56. What statistical test do I use?

    Hi there, I'm doing a study on the influence of sexuality on a camouflaging questionnaire which has a score rating (0-40), so is an interval...

    Started by Mohil‎, 01-06-2017 10:16 AM
    • Replies: 1
    • Views: 646
    01-07-2017, 09:12 PM Go to last post
  57. 1 way Anova vs Two Way Anova -HELP needed

    I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

    Started by BryRai‎, 01-03-2017 03:22 PM
    • Replies: 2
    • Views: 706
    01-05-2017, 08:06 AM Go to last post
  58. 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 04:29 PM
    • Replies: 0
    • Views: 597
    01-01-2017, 04:29 PM Go to last post
  59. Interpreting the interaction effect in a well known paper

    Attached you will find a well known research paper. If you go to page 438 (page 9 of the pdf file) you will find a model where: change in tax rate...

    Started by 12345678‎, 12-30-2016 03:25 PM
    • Replies: 5
    • Views: 724
    01-01-2017, 12:40 PM Go to last post
  60. how to obtain p-value from test statistic

    I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

    Started by dliner‎, 12-29-2016 02:26 PM
    mathematica, normality, statistics
    • Replies: 0
    • Views: 650
    12-29-2016, 02:26 PM Go to last post

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