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Threads 1561 to 1620 of 3193

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: 18,708
    10-11-2014, 12:02 PM Go to last post
  1. Trend Stationarity vs. Level Stationarity

    Can s.b. explains the difference between Trend Stationarity and Level Stationarity?

    Started by Fred_a‎, 03-14-2013 10:18 PM
    stationarity, time series
    • Replies: 0
    • Views: 2,342
    03-14-2013, 10:18 PM Go to last post
  2. 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: 2,748
    03-14-2013, 03:49 PM Go to last post
  3. No idea what tests to use!

    ** (P) (c) (f) (s) 3A 1 0 1 0 3B 1 1 1 1 ...

    Started by monkeyspearfish‎, 03-14-2013 08:57 AM
    • Replies: 2
    • Views: 2,246
    03-14-2013, 11:45 AM Go to last post
  4. Factor Scores

    I'm working on a political science project in which a number of the crucial variables are highly correlated. My approach would be to create factor...

    Started by mkobren‎, 03-14-2013 08:09 AM
    • Replies: 0
    • Views: 1,207
    03-14-2013, 08:09 AM Go to last post
  5. MANOVA: IV with only two levels

    Hi, I'm a biological science university student with an interest in teaching myself some basic inferential statistic and have been learning about...

    Started by hrj21‎, 03-13-2013 04:41 AM
    • Replies: 2
    • Views: 1,628
    03-14-2013, 06:48 AM Go to last post
  6. Te assumption of Normality

    Hello i have some variables which consists of 41 cases,those cases represent averages of many cases,that is, for each case the average is calculated...

    Started by osamahamza‎, 03-11-2013 03:21 AM
    • Replies: 4
    • Views: 1,742
    03-14-2013, 06:04 AM Go to last post
  7. Chi and linear-by-linear

    A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

    Started by abacus‎, 03-13-2013 11:45 AM
    • Replies: 4
    • Views: 4,542
    03-14-2013, 01:37 AM Go to last post
  8. Dimensionalities in Multi-Dimensional Scaling

    Hello all, :wave: I'm conducting market research and want to use compositional Multi-dimensional scaling to create perceptual maps of Brand...

    Started by JessieB‎, 03-11-2013 08:16 AM
    multi-dimensioanl scaling
    • Replies: 2
    • Views: 1,776
    03-14-2013, 12:49 AM Go to last post
  9. Survival Analysis

    Hello i have a group of varaibles which represent 251 variables express the GPA of the student(averages) througout 41 semester...what kind of...

    Started by osamahamza‎, 03-12-2013 04:25 AM
    • Replies: 2
    • Views: 2,083
    03-13-2013, 02:19 PM Go to last post
  10. Low Cronbach alpha on recognised instrument

    Hi, I am using a standard survey instrument that during a meta analysis over 15 years has shown a relability of 0.73 for a particular facet. I...

    Started by JakeMac‎, 03-12-2013 06:21 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 15,832
    03-13-2013, 07:08 AM Go to last post
  11. Question Comparison between two joint probability distributions

    I have two bivariate tables with variables "Birth Order" (with birth order 2, 3, 4 and 5) on one side and "Birth Interval" (with intervals 10-15,...

    Started by Sambit‎, 03-12-2013 05:24 AM
    • Replies: 0
    • Views: 2,225
    03-12-2013, 05:24 AM Go to last post
  12. How to calculate ARIMA(1,0,1)

    Hello, I want to forecast the 101th data of a time series and my data is as follow 99) 0.96 100) -0.2495 101) ? and my model Coefficients: ...

    Started by Fred_a‎, 03-11-2013 03:05 PM
    arima, time-series
    • Replies: 1
    • Views: 2,779
    03-12-2013, 02:17 AM Go to last post
  13. What is the purpose of multigroup invariance test?

    Hi, I am confused about the purpose of multigroup test. According to Byrne (2008), many studies focus on multigroup comparisons, and assume two...

    Started by Hosam‎, 03-10-2013 10:48 AM
    • Replies: 2
    • Views: 1,941
    03-10-2013, 08:52 PM Go to last post
  14. Can fixed effects models deal with nested data?

    I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

    Started by trinker‎, 03-08-2013 01:39 PM
    multilevel model
    • Replies: 4
    • Views: 4,467
    03-10-2013, 03:41 PM Go to last post
  15. creating a variable

    MY hypothesis is the following: The demographic variable of age has a significant impact on the relationship between organizational trust and the...

    Started by eunkum‎, 03-08-2013 02:56 PM
    • Replies: 1
    • Views: 1,515
    03-09-2013, 02:48 PM Go to last post
  16. Need help developing a metric that controls for variation between languages

    I need help of people with experience developing formulas and I am far from an expert on the subject. I want ideas for developing a metric that would...

    Started by micdhack‎, 03-08-2013 08:40 AM
    • Replies: 0
    • Views: 1,258
    03-08-2013, 08:40 AM Go to last post
  17. Statistical books (social sciences / policy analysis)

    Hello everyone! Next year I will be doing a MSc program in policy analysis at University of Leuven in Belgium. It's been a few years since I...

    Started by Kabouterke‎, 03-05-2013 07:09 AM
    • Replies: 4
    • Views: 1,906
    03-06-2013, 09:48 AM Go to last post
  18. Can Mac process 10GB data?

    I have got a very large dataset and need a computer that has the capacity of processing 10GB data. Is an Mac a good option? Also, what kind of...

    Started by t.wang21@yahoo.com.au‎, 03-05-2013 10:45 PM
    • Replies: 0
    • Views: 1,161
    03-05-2013, 10:45 PM Go to last post
  19. Input needed on an current model to answer research question

    Hi, I'm currently working on a research project and would appreciate any input or suggestions. In the study, we examined breast cancer...

    Started by MJH91‎, 03-03-2013 02:18 PM
    • Replies: 4
    • Views: 1,455
    03-05-2013, 05:11 PM Go to last post
  20. unbiased estimators

    in order to estimate the area of a squared field, two independent measures were taken of one of the sides: X1 and X2 two estimators were...

    Started by Yankel‎, 03-01-2013 04:19 PM
    • Replies: 6
    • Views: 2,247
    03-05-2013, 11:57 AM Go to last post
  21. pre- post- intervention survey analysis

    Hi all, I am trying to figure out how to analyze survey results administered as part of a randomized trial. We drew random samples of households...

    Started by siny911‎, 03-04-2013 03:40 PM
    anova, experiment
    • Replies: 13
    • Views: 5,516
    03-05-2013, 11:42 AM Go to last post
  22. Gaussian Processes - Wiener process - The drunk particle

    Hello, I recently read about Gaussian Processes (http://en.wikipedia.org/wiki/Gaussian_process) for non linear regression. I am not an expert but...

    Started by havyhidalgo‎, 03-04-2013 12:21 PM
    gaussian distribution, gaussian processes, regression model, wiener process
    • Replies: 0
    • Views: 2,243
    03-04-2013, 12:21 PM Go to last post
  23. Hierarchical (nested) ANOVA non-significant interactions

    Hi, I am trying to build and test models in hierarchical Analysis of Variance. I wondered if someone could offer some advice as to what to do if...

    Started by stats-student‎, 02-20-2013 11:07 AM
    • Replies: 4
    • Views: 1,653
    03-04-2013, 08:03 AM Go to last post
  24. transformation of inverse gamma distributed data

    Hi. I have inverse gamma distributed data (Pearson 5 distribution). I've tried some common transformation such as Ln, Lg, sqrt, LnGamma but could not...

    Started by garybooz‎, 02-27-2013 05:18 AM
    • Replies: 7
    • Views: 4,652
    02-27-2013, 08:46 PM Go to last post
  25. Lempel-Ziv Compression Test

    Dear All, Does anybody knows about the Lempel-Ziv Compression Test? I know that it is for randomness of a time series but not too much information...

    Started by masarimk‎, 02-27-2013 01:27 PM
    • Replies: 1
    • Views: 2,320
    02-27-2013, 02:15 PM Go to last post
  26. What to review before starting a PhD in statistics?

    Hello everyone, I will be starting a PhD program soon on a topic mainly related to bayesian statistics, sequential Monte-Carlo methods and...

    Started by Haribo‎, 02-27-2013 06:26 AM
    • Replies: 1
    • Views: 1,148
    02-27-2013, 10:55 AM Go to last post
  27. Panel design for experiment

    Hello everyone, I'm currently setting up an empirical experiment which I would like to analyze via a panel analysis (but any other would also do...

    Started by m_m‎, 02-27-2013 05:32 AM
    • Replies: 0
    • Views: 1,114
    02-27-2013, 05:32 AM Go to last post
  28. Mediation results where MV and IV become insignificant

    I have been running some mediation models and have come across a finding where individually the IndVar-DepVar and Mediator-DepVar relationships are...

    Started by dmcintyre‎, 02-26-2013 06:42 PM
    interpretation, mediation analysis, results
    • Replies: 0
    • Views: 1,668
    02-26-2013, 06:42 PM Go to last post
  29. Partial Correlation when one variable and the control are two-level ordinal variables

    I have one numerical variable and another two-level ordinal variable(e.g., one level is 27 and the other 51). I could classify it as a dichotomous or...

    Started by micdhack‎, 02-25-2013 12:34 PM
    • Replies: 9
    • Views: 10,232
    02-26-2013, 05:40 PM Go to last post
  30. question about 3 variables

    Good evening good people, I hope to get some help and good advice from you. The problem is follow: 1. I have one big questionnaire with...

    Started by badibad‎, 02-25-2013 02:18 PM
    • Replies: 0
    • Views: 1,643
    02-25-2013, 02:18 PM Go to last post
  31. Ideal method of imputation when all variables have missing data?

    Need to impute data for a large data set - all variables except 1-2 contain missing data so multiple imputation isn't working well. Any suggestions...

    Started by dx2724‎, 02-23-2013 04:34 AM
    • Replies: 3
    • Views: 1,618
    02-23-2013, 11:52 PM Go to last post
  32. Repeatability and Reproducibility

    Hi, I'm new to this and I'm not exactly a math expert. I am carrying out research in a lab, and I want to test repeatability and reproducibility of...

    Started by Newbe123‎, 02-20-2013 05:17 AM
    repeatability
    • Replies: 2
    • Views: 2,725
    02-21-2013, 10:25 AM Go to last post
  33. Fixed and random effect models?

    I've come across these model names in the literature and don't have that much background info on the topic. I was reading some definitions I found by...

    Started by Jka‎, 02-20-2013 03:31 AM
    • Replies: 1
    • Views: 1,466
    02-20-2013, 06:34 AM Go to last post
  34. Assumptions for an ARIMA(p, d, q) model (Box-Jenkins)

    I have a data set which is stationary but the histogram looks like a logaritmic distribution. Is this a problem? Is normality an assumption to use...

    Started by Fred_a‎, 02-18-2013 12:01 PM
    arima
    • Replies: 1
    • Views: 6,126
    02-18-2013, 12:52 PM Go to last post
  35. Sloppy financial stats

    I'm looking for a rough estimate of the probability that an annual increase in a market price will be less than i) 50% and ii) 70% (on any given...

    Started by welt‎, 02-16-2013 09:56 PM
    • Replies: 1
    • Views: 1,073
    02-18-2013, 04:39 AM Go to last post
  36. Do support vector machines automatically do variable selection ?

    Using the R command svm = svm(res~.,probability = T,type="nu-classification",data = train,cross=5) Does this "eliminate" variables so my svm...

    Started by lord12‎, 02-17-2013 08:59 PM
    • Replies: 0
    • Views: 1,592
    02-17-2013, 08:59 PM Go to last post
  37. Testing Mediation

    Hi All, I have a general question about the Mediation analysis using Hayes Soble test. My Question is : If there is no correlation between path b...

    Started by ghada8888‎, 02-16-2013 02:04 PM
    • Replies: 0
    • Views: 1,206
    02-16-2013, 02:04 PM Go to last post
  38. Need Appropriate statistical test

    Hi, I have to compare two groups data.On both groups one dependent variable and 20 independent variable.Sample size of both groups are different...

    Started by Poonam‎, 02-13-2013 04:20 AM
    • Replies: 10
    • Views: 1,819
    02-15-2013, 11:14 PM Go to last post
  39. What to do when number of variables is greater than number of observations?

    What are some techniques that are utilized when the number of predictors is greater than the number of observations?

    Started by lord12‎, 01-30-2013 04:12 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,743
    02-15-2013, 02:36 PM Go to last post
  40. Need urget help for one sample z test of proportions

    Hi All, I need to confirm whether I am doing it correctly. Survey question is: Have you ever witnessed violent episodes/incidents in the...

    Started by Markkkkk‎, 02-08-2013 01:49 AM
    one sample, proportion, statistical research, z test
    • Replies: 8
    • Views: 1,836
    02-14-2013, 05:42 AM Go to last post
  41. iPhone sensor data mining to predict events

    I'm working on a concept for a mobile device programming class. I have no clue whether or not it will work. Basically my plan is to mine all of the...

    Started by louloizides‎, 02-13-2013 06:07 PM
    • Replies: 0
    • Views: 1,396
    02-13-2013, 06:07 PM Go to last post
  42. 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: 1,119
    02-13-2013, 05:32 PM Go to last post
  43. Goodness of Fit Applicability

    I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

    Started by Archoplites‎, 02-13-2013 02:49 PM
    • Replies: 2
    • Views: 1,229
    02-13-2013, 05:09 PM Go to last post
  44. Wink What sample size do you need to not do signficance test

    Not really a statistical question I know.... This is covered in detail on another thread, but because of limits on my data I can not calculate a...

    Started by noetsi‎, 02-13-2013 10:30 AM
    • Replies: 4
    • Views: 1,253
    02-13-2013, 02:43 PM Go to last post
  45. Which statistical test? Help

    Hi I am stumped on what statistical test to used and was looking for some advice for a present study. There is one IV: experimental vs control...

    Started by bea123‎, 02-13-2013 10:56 AM
    • Replies: 1
    • Views: 1,209
    02-13-2013, 12:19 PM Go to last post
  46. Reliability/Survival - Where to start?

    General question: I want to examine the reliability/durability of an item that deteriorates every time it is used. Let's say the subject in question...

    Started by agp‎, 02-13-2013 10:48 AM
    • Replies: 0
    • Views: 1,187
    02-13-2013, 10:48 AM Go to last post
  47. Question about working with longitudinal data and z scores

    I was hoping someone could help me or point me in the right direction. The outcome variable for my study will be change in math scores over 3 years....

    Started by DBAske‎, 02-12-2013 04:52 PM
    longitudinal data, z scores
    • Replies: 0
    • Views: 1,496
    02-12-2013, 04:52 PM Go to last post
  48. Need quick reply

    If I have three categories (yes, no and don't know) for a single variable (say Effective_policies_in_hospital) with 50% 25% and 25% respectively... I...

    Started by Markkkkk‎, 02-12-2013 09:22 AM
    proportions, stata
    • Replies: 0
    • Views: 1,251
    02-12-2013, 09:22 AM Go to last post
  49. Low porbability from logistic regression

    Hi, I am facing a situation where I have very low probabilities (ave ~0.0008) after I performed the logistic regression. My original data...

    Started by boredaxel‎, 02-09-2013 01:38 AM
    • Replies: 0
    • Views: 1,534
    02-09-2013, 01:38 AM Go to last post
  50. Cluster analysis or factor analysis?

    I'm trying to decide which route to proceed for a project I am working on, any input is appreciated. Data: 228 by 10,000 matrix. 114 subjects'...

    Started by agp‎, 02-08-2013 09:25 PM
    • Replies: 1
    • Views: 1,353
    02-09-2013, 12:34 AM Go to last post
  51. MLE for correlation (not covariance) matrix?

    Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

    Started by Daniel Dvorkin‎, 02-08-2013 10:06 AM
    • Replies: 4
    • Views: 3,669
    02-08-2013, 11:33 AM Go to last post
  52. Bayesian Modeling Question

    :rolleyes:

    Started by bayesianman‎, 02-07-2013 10:55 PM
    • Replies: 3
    • Views: 1,395
    02-07-2013, 11:44 PM Go to last post
  53. non-parametric t-test with mean/SD = 0

    Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and...

    Started by Misagh‎, 02-04-2013 04:20 PM
    non-parametric, sem
    • Replies: 5
    • Views: 3,535
    02-05-2013, 11:24 PM Go to last post
  54. statistical analysis- ANOVA, t test, questionnaire

    Hi all, I am doing a mini research in HCI filed which examine the differences between pen touch and finger touch on specific Smartphone. I have...

    Started by hila‎, 02-02-2013 10:49 AM
    • Replies: 5
    • Views: 3,385
    02-04-2013, 04:44 PM Go to last post
  55. Correlation coeff vs. Logistic Regression Coeff.

    From a bunch of data points which look like: 1 1 1 1 1 1 1 1 1 1 0 1 1 0 1 1 0 0 1 0 1 1 0 0

    Started by Vatsa‎, 02-01-2013 10:19 AM
    logistic regression
    • Replies: 1
    • Views: 1,457
    02-01-2013, 11:33 AM Go to last post
  56. Fixed and Random Effects in Mixed Modeling

    Thank ahead of time for any help. I am analyzing time series data. Originally I was running Repeated Measures ANOVA and entering between subjects...

    Started by John.kostek‎, 01-23-2013 03:25 PM
    fixed effects, mixed modeling, random effects
    • Replies: 2
    • Views: 1,954
    02-01-2013, 07:40 AM Go to last post
  57. Analytic options with multi-level data?

    Hello, I've been struggling with choosing an analytical approach to some multi-level data (3 level) I'm working with and wanted to get some fresh...

    Started by schunajm‎, 08-05-2012 02:52 PM
    • Replies: 12
    • Views: 2,883
    01-31-2013, 01:15 PM Go to last post
  58. Examples of Repeated measures Poisson Model

    Does anyone have a good example of repeated measures Poisson Model? I want to try paired Poisson GLM to analyze so called spectral count data. In...

    Started by Jyk‎, 01-29-2013 05:05 PM
    • Replies: 0
    • Views: 2,560
    01-29-2013, 05:05 PM Go to last post
  59. Which correlation method is correct.

    I had a thread on this already, but can not find it.:shakehead I found a way to do polychoric correlations. A SAS macro. But I am not sure if the...

    Started by noetsi‎, 01-29-2013 03:27 PM
    • Replies: 0
    • Views: 1,903
    01-29-2013, 03:27 PM Go to last post
  60. Confusions regarding Regression, Multicollinearity and Factor Analysis

    I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

    Started by Blain Waan‎, 01-16-2013 08:00 AM
    factor analysis, multicollinearity, regresion analysis
    • Replies: 2
    • Views: 3,137
    01-29-2013, 03:18 PM Go to last post

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