1. 10-14-2010
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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: 7,888
    10-11-2014, 01:02 PM Go to last post
  1. 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: 118
    12-01-2016, 02:37 PM Go to last post
  2. 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: 104
    11-30-2016, 11:35 AM Go to last post
  3. 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: 188
    11-26-2016, 12:56 AM Go to last post
  4. 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: 206
    11-24-2016, 03:31 PM Go to last post
  5. sure independence screening in clustering

    How can use sure independent screening in clustering that there is no response variable?

    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 155
    11-23-2016, 01:01 AM Go to last post
  6. 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: 153
    11-22-2016, 02:02 PM Go to last post
  7. 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: 101
    11-22-2016, 01:44 PM Go to last post
  8. 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: 147
    11-21-2016, 01:51 PM Go to last post
  9. 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: 142
    11-21-2016, 03:10 AM Go to last post
  10. 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: 3
    • Views: 194
    11-19-2016, 12:42 PM Go to last post
  11. 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: 99
    11-19-2016, 09:49 AM Go to last post
  12. 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: 106
    11-19-2016, 03:19 AM Go to last post
  13. 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: 144
    11-18-2016, 03:18 PM Go to last post
  14. 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: 128
    11-18-2016, 06:28 AM Go to last post
  15. 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: 117
    11-18-2016, 04:13 AM Go to last post
  16. 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: 209
    11-15-2016, 06:12 AM Go to last post
  17. 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: 138
    11-14-2016, 04:21 PM Go to last post
  18. 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: 194
    11-14-2016, 11:14 AM Go to last post
  19. 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: 256
    11-14-2016, 03:21 AM Go to last post
  20. 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: 232
    11-11-2016, 03:40 PM Go to last post
  21. 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: 268
    11-08-2016, 08:35 AM Go to last post
  22. 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: 140
    11-08-2016, 06:51 AM Go to last post
  23. 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: 3
    • Views: 199
    11-07-2016, 10:15 AM Go to last post
  24. 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 09:49 PM
    • Replies: 12
    • Views: 408
    11-06-2016, 08:07 PM Go to last post
  25. 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: 193
    11-06-2016, 12:22 PM Go to last post
  26. 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 10:51 AM
    • Replies: 0
    • Views: 167
    11-05-2016, 10:51 AM Go to last post
  27. 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 04:07 PM
    non probability, nonparametric, parametric
    • Replies: 3
    • Views: 223
    11-03-2016, 05:56 PM Go to last post
  28. 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 04:37 AM
    • Replies: 1
    • Views: 190
    11-03-2016, 09:20 AM Go to last post
  29. 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 08:22 AM
    measurement error, multicolinearity, power
    • Replies: 12
    • Views: 393
    11-01-2016, 08:02 PM Go to last post
  30. 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 “no intercept”. Once I do...

    Started by elad83‎, 10-31-2016 02:55 PM
    anova, anova intercept
    • Replies: 3
    • Views: 260
    10-31-2016, 04:02 PM Go to last post
  31. 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 12:53 PM
    • Replies: 0
    • Views: 245
    10-27-2016, 12:53 PM Go to last post
  32. 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 07:36 AM
    cohort, repeated measures
    • Replies: 0
    • Views: 165
    10-27-2016, 07:36 AM Go to last post
  33. 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 06:26 AM
    • Replies: 1
    • Views: 347
    10-25-2016, 09:18 AM Go to last post
  34. 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 07:46 AM
    • Replies: 0
    • Views: 216
    10-24-2016, 07:46 AM Go to last post
  35. 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 12:08 PM
    lagged effects, mediation analysis, methodology, sobel test
    • Replies: 1
    • Views: 273
    10-21-2016, 04:48 PM Go to last post
  36. 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 04:38 AM
    matlab, multiple regression, regression, repeated measures
    • Replies: 0
    • Views: 157
    10-21-2016, 04:38 AM Go to last post
  37. 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 09:33 PM
    change, mixed anova, repeated measure, within-subjects
    • Replies: 0
    • Views: 129
    10-20-2016, 09:33 PM Go to last post
  38. 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 07:37 AM
    data set, prediction model, trend detection
    • Replies: 0
    • Views: 290
    10-20-2016, 07:37 AM Go to last post
  39. 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 06:51 PM
    • Replies: 3
    • Views: 188
    10-19-2016, 07:45 PM Go to last post
  40. 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 10:38 AM
    • Replies: 0
    • Views: 181
    10-19-2016, 10:38 AM Go to last post
  41. 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 01:13 PM
    • Replies: 0
    • Views: 245
    10-16-2016, 01:13 PM Go to last post
  42. 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 03:45 AM
    • Replies: 0
    • Views: 201
    10-16-2016, 03:45 AM Go to last post
  43. 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 09:29 PM
    • Replies: 1
    • Views: 252
    10-15-2016, 10:44 AM Go to last post
  44. 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 07:40 AM
    • Replies: 1
    • Views: 292
    10-11-2016, 09:08 AM Go to last post
  45. 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 02:12 AM
    bootstrap, data set, merged data
    • Replies: 3
    • Views: 360
    10-09-2016, 08:21 AM Go to last post
  46. 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 08:20 PM
    • Replies: 0
    • Views: 279
    10-03-2016, 08:20 PM Go to last post
  47. 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
    • Replies: 10
    • Views: 1,039
    10-02-2016, 07:38 PM Go to last post
  48. 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 01:36 PM
    • Replies: 0
    • Views: 283
    09-28-2016, 01:36 PM Go to last post
  49. 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 12:37 PM
    • Replies: 2
    • Views: 254
    09-26-2016, 04:27 PM Go to last post
  50. 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 01:12 PM
    • Replies: 0
    • Views: 212
    09-26-2016, 01:12 PM Go to last post
  51. 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 05:54 PM
    • Replies: 0
    • Views: 314
    09-21-2016, 05:54 PM Go to last post
  52. 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 10:02 AM
    bayesian, conjugate, jags, mcmc
    • Replies: 0
    • Views: 255
    09-20-2016, 10:02 AM Go to last post
  53. Time Series or GARCH? Can't decide..

    Hello, for a research thesis I want to compare returns of different asset classes with another. Think: stock indices, bond indices, a commodity...

    Started by Mastauser‎, 08-21-2016 05:47 AM
    • Replies: 3
    • Views: 428
    09-18-2016, 10:24 AM Go to last post
  54. Can I use gls if I don't need to use mixed models and var is not structured?

    I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

    Started by mgow‎, 09-14-2016 09:17 AM
    generalised least squares, heteroscedasticity, independent observations, nlme
    • Replies: 5
    • Views: 345
    09-14-2016, 05:01 PM Go to last post
  55. Comparing two datasets in terms of anonymisation

    Hi guys, hope you are doing good! I have quite the conundrum; I'm trying to figure out different ways I can cross-examine two datasets (D1 and...

    Started by jbwettergreen‎, 09-13-2016 04:07 AM
    • Replies: 0
    • Views: 237
    09-13-2016, 04:07 AM Go to last post
  56. Monte Carlo Simulation , a simpler version

    Hi all, I have asked this question before, but it seems I was not asked it in an appropriate way, so I draw the following flowchart which I think...

    Started by mohsenhs82‎, 09-12-2016 04:21 AM
    • Replies: 2
    • Views: 311
    09-12-2016, 05:59 AM Go to last post
  57. 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 04:58 AM
    gage r&r, precision, probability
    • Replies: 1
    • Views: 205
    09-12-2016, 05:21 AM Go to last post
  58. Monte Carlo for Weibull and Lognornam distributions in R

    I am involved in a project which needs statistic and computer science. I am more of a computer guy so I appreciate any statistical help. I am doing...

    Started by mohsenhs82‎, 09-11-2016 02:20 AM
    log-normal distribution, monte carlo, weibull distribution
    • Replies: 3
    • Views: 304
    09-12-2016, 04:26 AM Go to last post
  59. repeated cross sectional-partially changed study population

    I have a large dataset (n=11804) that includes data from a cross sectional study conducted in 2013, 2014 and 2015 in patients in nursing homes...so...

    Started by Viv92‎, 09-09-2016 04:33 AM
    analysis, drop outs, repeated cross sectional
    • Replies: 0
    • Views: 270
    09-09-2016, 04:33 AM Go to last post
  60. How to determine if two R2 values (rsquared) are significantly different

    Hi TalkStats :):):) I have fit two different functions (f1,f2) to some data. These functions have different forms (see below), in that they have...

    Started by mahdieh.godazgar‎, 09-07-2016 11:29 AM
    f statistic, f test, fit statistics, least squares regression, rsquare
    • Replies: 4
    • Views: 386
    09-08-2016, 01:28 PM Go to last post

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