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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: 19,431
    10-11-2014, 12:02 PM Go to last post
  1. What non-parametric test should I use?

    Hi all, I am looking for some help on finding an appropriate test to analyse the variance between groups. The data I am assessing is: -...

    Started by Nath‎, 12-20-2016 10:48 AM
    • Replies: 1
    • Views: 3,238
    12-21-2016, 01:24 AM Go to last post
  2. 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: 5,502
    12-20-2016, 09:24 AM Go to last post
  3. One Sample T-Test with Likert Scale Questionnaire

    Hi all, I am doing a research and will study the how user think about shopping online. In my questionnaire, I have 3 questions - using Likert...

    Started by kenzq‎, 04-17-2009 03:08 AM
    • Replies: 8
    • Views: 68,318
    12-17-2016, 02:18 AM Go to last post
  4. Repeated k-fold Cross-Validation

    I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

    Started by hlsmith‎, 12-09-2016 02:49 PM
    • Replies: 12
    • Views: 7,855
    12-16-2016, 10:35 AM Go to last post
  5. Sample Size Help for Observation Study

    I wanted to calculate sample size for a single group, observational study. I'll be using a questionnaire to predict outcome (i.e. score on another...

    Started by murphy‎, 12-15-2016 11:36 PM
    • Replies: 4
    • Views: 3,280
    12-16-2016, 10:29 AM Go to last post
  6. Question Likert scale in SPSS

    Hello, Iíve got an research assignment to do by means of questionnaire. Iíve got some basic info (gender, education level, etc) and then Iíve got 9...

    Started by afronef‎, 12-13-2016 06:49 AM
    • Replies: 1
    • Views: 2,748
    12-13-2016, 08:11 AM Go to last post
  7. Question How to analyze two opposing sides survey results?

    Hi! I am doing a research between two b2b sides that are cooperating. I have already made one survey and about to do the other. The point is to...

    Started by tehnik‎, 11-13-2016 01:31 PM
    • Replies: 2
    • Views: 3,525
    12-12-2016, 12:15 PM Go to last post
  8. Probability of Events in Equations

    Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

    Started by mjgarrin‎, 12-09-2016 09:20 AM
    • Replies: 3
    • Views: 3,878
    12-12-2016, 09:48 AM Go to last post
  9. S-shapec urve goodness of fit

    hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2...

    Started by atlasm‎, 12-07-2016 01:44 AM
    data, s-shape, test of significance
    • Replies: 0
    • Views: 2,854
    12-07-2016, 01:44 AM Go to last post
  10. Poisson point process

    I came across this in a network model: Distribute N points according to a homogeneous Poisson point process in a two-dimensional space of unit...

    Started by spinningfeather‎, 12-06-2016 02:24 PM
    • Replies: 0
    • Views: 2,775
    12-06-2016, 02:24 PM Go to last post
  11. Propensity score matching - pre-treatment outcome variable

    Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

    Started by Chickencheese‎, 11-19-2016 08:14 AM
    control, matching, propensity score matching
    • Replies: 5
    • Views: 3,821
    12-05-2016, 03:20 PM Go to last post
  12. Estimated Parameter as Dependent Variable

    Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

    Started by Maya_L‎, 12-01-2016 02:06 PM
    bootstraping, error term, estimated parameter
    • Replies: 2
    • Views: 3,300
    12-01-2016, 02:37 PM Go to last post
  13. which statistic analysis-percentage frequency data-protocol analysis

    I have done a research with designers. I collect the data from every one separately through protocol analysis. I want to find the association...

    Started by Elaheh‎, 11-30-2016 11:35 AM
    • Replies: 0
    • Views: 3,403
    11-30-2016, 11:35 AM Go to last post
  14. How can I statistically prove which data is more reliable

    We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

    Started by Bhaskar‎, 11-26-2016 12:56 AM
    • Replies: 0
    • Views: 2,706
    11-26-2016, 12:56 AM Go to last post
  15. How to deal with unknown distribution?

    I have a game with two players. Player 1's type is publicly known, while player 2's type is unknown (privately known to him) and distributed, say,...

    Started by Vova‎, 11-24-2016 03:31 PM
    • Replies: 0
    • Views: 3,488
    11-24-2016, 03:31 PM Go to last post
  16. sure independence screening in clustering

    ------------

    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 3,218
    11-23-2016, 01:01 AM Go to last post
  17. What kind of tests i can do to see if two diseases are related

    I am using data from this website (data is at the bottom of the page) for a case-study. For the sake of question lets stick to any of FluWatch sheet...

    Started by x509‎, 11-22-2016 11:04 AM
    • Replies: 5
    • Views: 3,344
    11-22-2016, 02:02 PM Go to last post
  18. GAMs: test of simple effects following a significant interaction

    Hello, I am a novice in Generalized Additive Models (GAMs) and I would need some advice on these models. From capture data, I would like to...

    Started by MarineRegis‎, 11-22-2016 01:44 PM
    gam model, interaction term
    • Replies: 0
    • Views: 3,173
    11-22-2016, 01:44 PM Go to last post
  19. Data analysis

    Hi, please can someone help me out. I would like to know if I have performed the correct analysis for my study. I am comparing direct response...

    Started by Hafsah‎, 11-21-2016 01:51 PM
    • Replies: 0
    • Views: 3,628
    11-21-2016, 01:51 PM Go to last post
  20. Stuck on Battle Plan for analysis

    Hello, Currently I am looking for some advice regarding my research. Previous research has shown that Construct 1 and Construct 2 are both...

    Started by Mathis-Dantes‎, 11-20-2016 03:19 PM
    • Replies: 1
    • Views: 2,613
    11-21-2016, 03:10 AM Go to last post
  21. Choosing bachelor's thesis topic

    Hello everyone. I am going to make research on statistics/data analysis for my bachelor's thesis. What are the popular areas of research in...

    Started by nail-uwec‎, 11-19-2016 09:49 AM
    • Replies: 0
    • Views: 3,222
    11-19-2016, 09:49 AM Go to last post
  22. it is must to include include ANOVA results in specified format

    Hi. My thesis has calculations that uses one-way ANOVA.There are 40 dependent variables which are needed to be compared under 14 independent...

    Started by addikted‎, 11-19-2016 03:19 AM
    • Replies: 0
    • Views: 3,670
    11-19-2016, 03:19 AM Go to last post
  23. Testing Historical Data

    Hello Folks, I have 5 years of data on GPA, credit completions etc. and several categorical variables ( ex. gender, ethnicity, age). I have tried...

    Started by Ana_Res‎, 11-18-2016 03:18 PM
    • Replies: 0
    • Views: 2,495
    11-18-2016, 03:18 PM Go to last post
  24. Sample size estimation for multinomial autocorrelated data

    I'm trying to work out the minimum sample size needed to accurately characterise land cover data. The idea is to set out the a number of quadrats...

    Started by killbot2000‎, 11-18-2016 06:28 AM
    autocorrelation, multinomial, sample size, spatial
    • Replies: 0
    • Views: 2,522
    11-18-2016, 06:28 AM Go to last post
  25. ROC Curves

    Good Morning, I have a problem that may perhaps be very simple, but I keep getting very stuck and very frustrated. I'm trying to produce ROC...

    Started by SiobhanRoisin‎, 11-18-2016 04:13 AM
    false positive rate, roc curves, true negative
    • Replies: 0
    • Views: 2,600
    11-18-2016, 04:13 AM Go to last post
  26. multivariate regression problem - correlated residuals

    this question asks for help for a statistical/econometric problem I can't get the clue: I have a classic multivariate regression problem, i.e....

    Started by Valeria Azarova‎, 11-15-2016 06:12 AM
    multivariate-regression, residuals, stata
    • Replies: 0
    • Views: 2,545
    11-15-2016, 06:12 AM Go to last post
  27. Question research statistics (really stuck)

    -------------------------------------------------------------------------------- This is a question pertaining to a real-life data analysis. It is...

    Started by Jack Florence‎, 11-14-2016 04:21 PM
    • Replies: 0
    • Views: 3,654
    11-14-2016, 04:21 PM Go to last post
  28. Item Response Question

    I have received some survey data for 200 respondents. DV: Binary (20=1; 180=0) 20 IVs, Likert 5-point scale and currently treated as...

    Started by hlsmith‎, 11-10-2016 09:12 AM
    • Replies: 5
    • Views: 2,747
    11-14-2016, 03:21 AM Go to last post
  29. Post What experimental design would be most appropriate?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-11-2016 03:40 PM
    • Replies: 0
    • Views: 2,709
    11-11-2016, 03:40 PM Go to last post
  30. Question - Is Simpson's Paradox the same as spuriousness

    Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

    Started by cs_ut‎, 11-07-2016 05:34 PM
    • Replies: 3
    • Views: 3,572
    11-08-2016, 08:35 AM Go to last post
  31. Survey on how frequently a group use a particular device: Which analysis methods?

    I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

    Started by clivegibbs‎, 11-08-2016 06:51 AM
    friedman test, survey, wilcoxon
    • Replies: 0
    • Views: 2,636
    11-08-2016, 06:51 AM Go to last post
  32. which statistical test to use - Observed difference in outcome is due to chance?

    Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

    Started by deepbiomed‎, 11-03-2016 08:49 PM
    • Replies: 12
    • Views: 3,899
    11-06-2016, 08:07 PM Go to last post
  33. What can the standard errors tell me?

    Hello dear forum members! I wanted to share with you a couple graphs and seek your wisdom on the insights that I may be omitting. According to...

    Started by kiton‎, 11-06-2016 12:22 PM
    • Replies: 0
    • Views: 2,913
    11-06-2016, 12:22 PM Go to last post
  34. Balance in covariates in randomized trials

    Hi, I am new to this forum and have a question regarding randomized controlled trials (RCT). How can you mathematically/statistically derive that...

    Started by tompa‎, 11-05-2016 09:51 AM
    • Replies: 0
    • Views: 3,076
    11-05-2016, 09:51 AM Go to last post
  35. Question about parametric and nonparametric tests and non-probability sampling

    I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have...

    Started by momanger‎, 11-03-2016 03:07 PM
    non probability, nonparametric, parametric
    • Replies: 3
    • Views: 3,418
    11-03-2016, 04:56 PM Go to last post
  36. measure of effect size for categorical association

    Hello, I am having difficulties in wrapping my head around an issue regarding chi-squared statistic, Cramer's V, and Cohen's measure of effect...

    Started by gianmarco‎, 11-03-2016 03:37 AM
    • Replies: 1
    • Views: 2,918
    11-03-2016, 08:20 AM Go to last post
  37. Power calculation with measurement error on Y

    I'm trying to do a power calculation for a study I'm involved in, and I'm a bit stuck. The study is about textual cues of trust. We want to...

    Started by Junes‎, 11-01-2016 07:22 AM
    measurement error, multicolinearity, power
    • Replies: 12
    • Views: 3,840
    11-01-2016, 07:02 PM Go to last post
  38. Anova without intercept?

    Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says ďno interceptĒ. Once I do...

    Started by elad83‎, 10-31-2016 01:55 PM
    anova, anova intercept
    • Replies: 3
    • Views: 3,811
    10-31-2016, 03:02 PM Go to last post
  39. Two mediators (serial mediation)

    Dear all, I am writing my master thesis and really need help with one issue. I am investigating the following serial mediation (so 2 mediators...

    Started by StatHanna‎, 10-27-2016 11:53 AM
    • Replies: 0
    • Views: 2,850
    10-27-2016, 11:53 AM Go to last post
  40. Repeated measures with different cohorts

    Dear all, I have data from 3 different art groups (orchestra, dance, musical theatre) collected in 3 different times of measure. Data is...

    Started by Subcora‎, 10-27-2016 06:36 AM
    cohort, repeated measures
    • Replies: 0
    • Views: 3,018
    10-27-2016, 06:36 AM Go to last post
  41. Applicability of Bayes to Contingency Tables (Chi-Squared)

    Is it possible to apply the Bayes factor to tests of/for independence/homogeneity (Chi-Square)? You can find a file below. The contingency table...

    Started by trulu‎, 10-05-2016 05:26 AM
    • Replies: 1
    • Views: 2,934
    10-25-2016, 08:18 AM Go to last post
  42. Relationship between actual and expected

    Hi, I am trying to illustrate relationship between expected and observed occurrences for my variable X. Outcomes for my variable vary between 0-5...

    Started by samot79‎, 10-24-2016 06:46 AM
    • Replies: 0
    • Views: 2,644
    10-24-2016, 06:46 AM Go to last post
  43. Assessing mediation with lagged predictors

    Hello dear forum members! I am seeking your comments/advises on the following question related to assessing mediation effects. Following the...

    Started by kiton‎, 10-21-2016 11:08 AM
    lagged effects, mediation analysis, methodology, sobel test
    • Replies: 1
    • Views: 2,817
    10-21-2016, 03:48 PM Go to last post
  44. Regression for multiple scores obtained from multiple subjects

    Hello, I have preference ratings (1-to-7 scale) for k=80 stimuli, obtained from N=30 subjects. I would like to do a multiple regression for these...

    Started by wildetudor‎, 10-21-2016 03:38 AM
    matlab, multiple regression, regression, repeated measures
    • Replies: 0
    • Views: 2,370
    10-21-2016, 03:38 AM Go to last post
  45. The effect of a single continuous IV on within subjects change

    Could someone please suggest the most appropriate method of analysis to examine the effect of a continuous IV on a within subject (repeated measures)...

    Started by vivienf‎, 10-20-2016 08:33 PM
    change, mixed anova, repeated measure, within-subjects
    • Replies: 0
    • Views: 2,119
    10-20-2016, 08:33 PM Go to last post
  46. trend or forecast

    I have done some research related to computer users and files generating pattern on PC. I collected data from PC where I have information when (date)...

    Started by explorer‎, 10-20-2016 06:37 AM
    data set, prediction model, trend detection
    • Replies: 0
    • Views: 2,183
    10-20-2016, 06:37 AM Go to last post
  47. Why "controlling for X" studies may be fatally flawed

    I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

    Started by Junes‎, 10-19-2016 05:51 PM
    • Replies: 3
    • Views: 2,961
    10-19-2016, 06:45 PM Go to last post
  48. Paper Survey for (Statistical) Function Modelling

    Hi! I'm surveying some papers for different kinds of approaches for (statistical) function modelling. Suppose (x_1,...,x_n) is one of multiple...

    Started by VincentJYTsai‎, 10-19-2016 09:38 AM
    • Replies: 0
    • Views: 2,180
    10-19-2016, 09:38 AM Go to last post
  49. Please help, parametric or non-parametric test?

    I have a data set of 58 records containing students, gender, total sat score and sat score for each part. 40% of the records are Male, 60% female ...

    Started by kdsan‎, 10-16-2016 12:13 PM
    • Replies: 0
    • Views: 2,414
    10-16-2016, 12:13 PM Go to last post
  50. Need help- finding the right test

    Hello, I need to compare three indices that were measured at a few different sites, which means I can't use their actual values because they are...

    Started by Royan‎, 10-16-2016 02:45 AM
    • Replies: 0
    • Views: 2,128
    10-16-2016, 02:45 AM Go to last post
  51. Sample Size Calculation (HELP!)

    Hi all, I wish someone could help me out. I am trying to estimate the sample size for a national health survey. From the previous report,...

    Started by chummsy‎, 10-12-2016 08:29 PM
    • Replies: 1
    • Views: 2,068
    10-15-2016, 09:44 AM Go to last post
  52. Testing for difference between locations of two variables using longitude and latitud

    Hello, Hypothesis: there is a correlation between instances of violent conflict and mining concessions in the DRC. I have data sets of both...

    Started by jonathan.rothwell39‎, 10-11-2016 06:40 AM
    • Replies: 1
    • Views: 2,044
    10-11-2016, 08:08 AM Go to last post
  53. Unhappy How to merge two data sets with varying date intervals?

    I'm sure this problem isn't unique. I have two sets of data, both $ values and I want to add them together and plot them on a chart. The problem...

    Started by tomydom‎, 10-07-2016 01:12 AM
    bootstrap, data set, merged data
    • Replies: 3
    • Views: 1,912
    10-09-2016, 07:21 AM Go to last post
  54. Lightbulb test for compariing pre- post test on same anonymized participants

    I am conducting a research to study the change in business skills, and attitude towards self employment after a compulsory intervention program for...

    Started by Husssy‎, 10-03-2016 07:20 PM
    • Replies: 0
    • Views: 2,325
    10-03-2016, 07:20 PM Go to last post
  55. Variance Inflation Factor

    Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

    Started by MasterStudent‎, 03-10-2016 08:03 AM
    vif
    • Replies: 10
    • Views: 5,717
    10-02-2016, 06:38 PM Go to last post
  56. Machine Learning Out Predicting ESPN?

    The Amos model over takes ESPN's FPI? Check it out and Week 4 picks http://trevorbischoff.com/amos-2016-nfl-predictor/

    Started by LeeBalto‎, 09-28-2016 12:36 PM
    • Replies: 0
    • Views: 2,425
    09-28-2016, 12:36 PM Go to last post
  57. Heckman regression models

    I am using a 2step heckman regression model and I want to evaluate that probit looks okay and that the model converges and that there are no "red"...

    Started by micdhack‎, 09-26-2016 11:37 AM
    • Replies: 2
    • Views: 1,395
    09-26-2016, 03:27 PM Go to last post
  58. Testing if the volatility of single stocks and/or indices have risen in the past.

    Hey Guys, I'm an economics and business student from Basel(Switzerland), and I'm currently writing my bachelor thesis in "Corporate Financial...

    Started by RazorLazor‎, 09-26-2016 12:12 PM
    • Replies: 0
    • Views: 1,842
    09-26-2016, 12:12 PM Go to last post
  59. Comparing Proportions with difference numbers of events

    So, I'm interested in examining prey preference of a predator and one of the metrics I am interested in rejection rates for attack. I have 1 hour...

    Started by nebulus‎, 09-21-2016 04:54 PM
    • Replies: 0
    • Views: 1,959
    09-21-2016, 04:54 PM Go to last post
  60. Comparing the output of JAGS to conjugate analysis - normal with unknown mean and var

    Dear Bayesians. I'm starting my way in the Bayesian world, and I'm trying to build a simple model for estimating the mean and variance of a normal...

    Started by idif‎, 09-20-2016 09:02 AM
    bayesian, conjugate, jags, mcmc
    • Replies: 0
    • Views: 1,150
    09-20-2016, 09:02 AM Go to last post

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