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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: 19,348
    10-11-2014, 12:02 PM Go to last post
  1. Non parametric test help - Grad student

    I have a data set of 6 different element's values (i.e. Aluminum= 0.25, Copper= 0.06, etc.) over a two year period. I am trying to see if there are...

    Started by ztor‎, 03-11-2015 01:18 PM
    • Replies: 0
    • Views: 2,059
    03-11-2015, 01:18 PM Go to last post
  2. How to generate an autocorrelated random variable?

    Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

    Started by consuli‎, 03-04-2015 05:06 PM
    2 Pages
    1 2
    autocorrelation
    • Replies: 15
    • Views: 5,258
    03-11-2015, 01:08 PM Go to last post
  3. Sampling Samples from a Big Data Set in R

    I have a large data set (23 million records, ~ 9 Gb) coming in R and am trying to figure out the best way to draw a sample from it. The plan I...

    Started by journalist‎, 03-11-2015 11:21 AM
    big data, sampling
    • Replies: 0
    • Views: 1,371
    03-11-2015, 11:21 AM Go to last post
  4. Which statistical test to use to establish different behaviour between groups?

    Hi, I have got a dataset with a dichotomous groupid variable and many other independent categorical variables. My aim is to find out if subjects...

    Started by ambij‎, 03-08-2015 05:20 AM
    chi-squared, fishersexact, logistic, statistical-significance
    • Replies: 0
    • Views: 1,883
    03-08-2015, 05:20 AM Go to last post
  5. Univariate vs Multivariate results

    Hi, Am I correct in assuming that if a variable was found to be good predictor in univariate analysis, it should also be found to be a good...

    Started by ambij‎, 03-08-2015 05:19 AM
    multivariate-analysis, multivariate-regression, predictor, univariate
    • Replies: 0
    • Views: 1,188
    03-08-2015, 05:19 AM Go to last post
  6. repeated measure ANOVA, are comparisons at different time points independent?

    Hi, i have been set the task to critically analyse a research paper > http://wageningenacademic.metapress.com/content/5065134j5v339382/fulltext.pdf ...

    Started by mattiel‎, 03-07-2015 08:54 AM
    repeated measures anova
    • Replies: 0
    • Views: 1,211
    03-07-2015, 08:54 AM Go to last post
  7. Data Capture

    I'm not sure if this is the correct place to ask this question. I have a support team in my office and I want to understand why people are calling...

    Started by kiwis‎, 03-06-2015 02:06 PM
    • Replies: 1
    • Views: 1,484
    03-06-2015, 05:27 PM Go to last post
  8. mean+standard deviation+skewness+kurtosis

    hi I want to order some variables according to (mean+standard deviation+skewness+kurtosis) or some new rule considering mean value, standard...

    Started by WEIBO‎, 03-06-2015 05:51 AM
    kurtosis, skewness
    • Replies: 8
    • Views: 2,612
    03-06-2015, 02:25 PM Go to last post
  9. Convergence in LLN and CLT help!

    Hi there, I am trying to figure out how convergence in law of large number and central limit theorem is affected by correlation in the random...

    Started by artzahar‎, 03-06-2015 04:29 AM
    central limit theore, law of large number, statistics
    • Replies: 1
    • Views: 1,307
    03-06-2015, 08:34 AM Go to last post
  10. sample size calculation

    I am trying to determine the necessary sample size I need for a study. Standard 80% power and </= 0.05 p value. The study is designed to use two...

    Started by GGarvin‎, 03-05-2015 09:06 PM
    • Replies: 1
    • Views: 2,555
    03-06-2015, 02:47 AM Go to last post
  11. Standard Deviation of non-numerical data

    I am trying to determine the standard deviation data that is not itself numerical, but its count is. For example, If I have a dataset from a survey...

    Started by Ghostbusters‎, 03-05-2015 03:51 PM
    • Replies: 0
    • Views: 2,744
    03-05-2015, 03:51 PM Go to last post
  12. Help assessing convergence across categorical responses

    Hi folks I posted this in the SPSS section, but its actually more a question about which test to use so I think it belongs here. I'm working...

    Started by COFisher‎, 03-05-2015 11:07 AM
    • Replies: 0
    • Views: 967
    03-05-2015, 11:07 AM Go to last post
  13. Smile Do I have to test normality?

    I have an experiment contains 10 students and 2 experts. I want to test if the average of students evaluation for the 1st question is similar to...

    Started by ger95‎, 03-03-2015 05:11 AM
    • Replies: 2
    • Views: 1,308
    03-03-2015, 11:55 AM Go to last post
  14. Help with correct statistical test please

    Hi everyone. I am a novice at statistical tests, as such I need urgent help in determining what type of statistical test to use in hypothesis testing...

    Started by oludot5‎, 03-03-2015 05:20 AM
    • Replies: 1
    • Views: 1,458
    03-03-2015, 05:28 AM Go to last post
  15. Multiple choice preference experiments, analysis by Lockwood 1998 Oecoligia 116: 475-

    Anyone familiar with Lockwood's method for multiple choice significance tests using modified Hotelling T2? I'm stuck on trying to understand his...

    Started by jeff k‎, 01-14-2015 08:22 PM
    • Replies: 2
    • Views: 1,768
    02-27-2015, 09:51 AM Go to last post
  16. How to measure relationship between two series

    Hi everybody, I am looking for direction on how to proceed with the following issue. I am running some experiments relating to the appearance...

    Started by tuathal‎, 02-26-2015 08:21 AM
    • Replies: 0
    • Views: 968
    02-26-2015, 08:21 AM Go to last post
  17. Testing for a difference in standard deviation

    Hello Everyone I've encountered the following problem - I have this test that was administrated to a sample of participants, in a 2X2 design (both...

    Started by Curious guy‎, 02-26-2015 07:44 AM
    • Replies: 0
    • Views: 1,188
    02-26-2015, 07:44 AM Go to last post
  18. Need help picking model to use with psuedo time series data

    Hello everyone. I have quite a few questions and would like some help/advice or a general pointing i the correct direction. I have a dataset that...

    Started by Anotherdream‎, 02-25-2015 10:23 PM
    • Replies: 0
    • Views: 1,298
    02-25-2015, 10:23 PM Go to last post
  19. MANOVA vs. Chi-squared

    So I am running an experiment where I am interested in the proportion of time spent doing certain behaviors under different treatments. I know...

    Started by nebulus‎, 02-24-2015 07:55 PM
    • Replies: 0
    • Views: 956
    02-24-2015, 07:55 PM Go to last post
  20. Transformation of a Uniform Distribution needed

    Hello, I have got a crazy distributed p4. (See file attachment). How can I transform a uniform distribution into the one of p4? Probit...

    Started by consuli‎, 02-24-2015 09:45 AM
    • Replies: 2
    • Views: 1,208
    02-24-2015, 12:02 PM Go to last post
  21. Event Study - Impact from different periods

    Hi! I was wondering if you could help me with something. I would really, really appreciate it. As it is some time since i did my econometrics...

    Started by Upper‎, 02-24-2015 10:25 AM
    • Replies: 0
    • Views: 1,150
    02-24-2015, 10:25 AM Go to last post
  22. convenience sampling and p-values

    Dear all, I am in the middle of my research. I gathered data (via convenience sampling). I intend to run PCA/EFA and then use dimensions in logistic...

    Started by purifyz‎, 02-23-2015 03:19 PM
    convenience sampling
    • Replies: 2
    • Views: 1,311
    02-24-2015, 06:20 AM Go to last post
  23. Help needed in analyzing sequential data

    Hi! I hope for your advice and directions: I've data that codes a sequence of behaviors. Each sequences is of different lengths. I have 1400...

    Started by Sam31‎, 02-24-2015 02:47 AM
    • Replies: 0
    • Views: 1,083
    02-24-2015, 02:47 AM Go to last post
  24. Maximum Likelihood Estimator for a Transformed Uniorm Distribution

    Hello, I have got a transformed uniform distribution. The distribution is of the form: v= u^w Where u: uniform distributed variable w:...

    Started by consuli‎, 02-23-2015 06:21 AM
    • Replies: 0
    • Views: 981
    02-23-2015, 06:21 AM Go to last post
  25. How to alter the standard deviation of an empirical distribution?

    For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

    Started by consuli‎, 02-21-2015 09:46 AM
    • Replies: 4
    • Views: 2,254
    02-21-2015, 05:46 PM Go to last post
  26. Question Mixed model for two way ANOVA with SPSS

    Hi, I have to do a two way anova repeated measures (one between factor with 2 levels: control and treated, one within factor with 3 levels: time...

    Started by franziska77‎, 02-21-2015 03:08 PM
    • Replies: 0
    • Views: 980
    02-21-2015, 03:08 PM Go to last post
  27. analysis over all items OR by-subject OR by-items analysis?

    Hi, Let's say you have a data set of for instance 20 subjects who all answered 15 questions. Every question is one items that is either correct...

    Started by fruppel‎, 02-20-2015 08:05 AM
    by-subject by-item
    • Replies: 1
    • Views: 1,682
    02-20-2015, 10:22 AM Go to last post
  28. How to generate multiple correlated variables?

    Hello! One can generate two c0rrelated variables as follows: x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal random variable...

    Started by consuli‎, 02-18-2015 07:33 AM
    • Replies: 2
    • Views: 3,135
    02-19-2015, 12:15 PM Go to last post
  29. Help in determining a proper statistical test an approach for research question

    Ik have a problem in determining the right statistical test for my research. First I will give some background information. I want to research the...

    Started by Redmar89‎, 02-19-2015 08:48 AM
    l test, logit, regression, research, statistica
    • Replies: 0
    • Views: 1,375
    02-19-2015, 08:48 AM Go to last post
  30. Question Choosing an appropriate test: MANOVA? ANCOVA? Something else?

    I am performing a "dry run" statistical analysis on my dissertation data pretest, and I'm looking for a little guidance regarding the specific...

    Started by Eaners‎, 02-13-2015 02:50 AM
    continuous variable, interaction, statistical analysis
    • Replies: 3
    • Views: 1,761
    02-18-2015, 04:15 PM Go to last post
  31. statistical analyis of weather data

    Hello, I made ambient temperature and relative humidity measurements using a sensor, next to a highly accurate meteorological station and i want...

    Started by shays‎, 02-18-2015 06:22 AM
    meteorological variables, research for thesis, statistical analysis, temperature, weather
    • Replies: 0
    • Views: 1,319
    02-18-2015, 06:22 AM Go to last post
  32. similarity between two random variables

    There have two random variables, each of which is of five dimension. One random variable tracks the data collected from one device. The other random...

    Started by winecoding‎, 02-15-2015 01:46 PM
    distance, distance measure, metrics, multivariate analysis, nonparametric
    • Replies: 0
    • Views: 1,376
    02-15-2015, 01:46 PM Go to last post
  33. Literature regarding Multinomial Logit Regression

    Hello, I am looking for helpful links and literature regarding the logit regression with a multinomial target variable aka multinomial GLM. ...

    Started by consuli‎, 02-12-2015 08:06 AM
    • Replies: 0
    • Views: 928
    02-12-2015, 08:06 AM Go to last post
  34. equal/unequal sample sizes

    I have recently sent a paper on aflatoxin levels in nuts for publishing. The aim of the study was to analyze a total amount of 106 nuts. The nuts...

    Started by ivn‎, 02-09-2015 02:17 PM
    • Replies: 3
    • Views: 2,280
    02-09-2015, 03:20 PM Go to last post
  35. ANOVA not significant but Tukey is

    I'm still new to stats and would like to know if the results below indicate significance, or at least a trend. Being compared are three independent...

    Started by Petes‎, 12-11-2012 04:25 AM
    • Replies: 1
    • Views: 3,410
    02-08-2015, 09:48 AM Go to last post
  36. help with significant interaction, but without simple effects in 2*3 repeated ANOVA

    Dear Experts, I have a 2*3 repeated ANOVA data. I found a significant interaction effect between them (it is a marginal effect, p=0.047). However,...

    Started by lickey1981‎, 02-07-2015 06:36 AM
    • Replies: 0
    • Views: 1,136
    02-07-2015, 06:36 AM Go to last post
  37. Exclamation Permutation - distribution

    Dear All, I'm in need for some help. I have two data sets looking like this (just as an example): Dataset 1: GCA GCT GCC GCG...

    Started by mrtwino‎, 02-07-2015 04:40 AM
    • Replies: 0
    • Views: 1,387
    02-07-2015, 04:40 AM Go to last post
  38. Angry Call response time distribution [Help needed]

    Hello everyone! I'm new to this forum but I want to start off by making a request. The thing is I'm working on a project regarding call-back...

    Started by The_Chosen_One‎, 02-04-2015 07:22 PM
    • Replies: 4
    • Views: 1,475
    02-05-2015, 01:46 PM Go to last post
  39. McNemar's test post-hoc power analysis problem when odds ratio=0

    I need to do post-hoc power analysis for a McNemar's test (using G*power), and am having trouble getting results. One of the discordant pairs is 0,...

    Started by elmorem‎, 02-04-2015 01:03 PM
    mcnemar's test, odds ratio, post-hoc, power analysis, power calculation
    • Replies: 1
    • Views: 2,406
    02-04-2015, 01:13 PM Go to last post
  40. Post Transforming data

    Hi, I did General linear model using SPSS and i do not have homogeneity of variances, How i can solve this problem? DO i need to transformmy...

    Started by Elhama‎, 01-30-2015 06:37 PM
    • Replies: 0
    • Views: 1,359
    01-30-2015, 06:37 PM Go to last post
  41. Scale Issue - MANOVA vs Kruskall Wallis

    Hello, In my dissertation, I asked people in the general population to complete a battery of team process measures based on an effective team...

    Started by I-O Student‎, 01-07-2015 11:24 AM
    manova, non-parametric test, rank-order data
    • Replies: 2
    • Views: 2,147
    01-28-2015, 03:50 PM Go to last post
  42. Question Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

    Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

    Started by Eaners‎, 01-27-2015 10:22 PM
    cronbach's alpha, likert scale analysis, pretest
    • Replies: 6
    • Views: 1,586
    01-28-2015, 02:46 PM Go to last post
  43. Non-parametric test (2 related samples)

    At present I am working on a hospital data set. I have categorised cases as either having Error or No Error. Another variable is the hospital...

    Started by jle‎, 01-27-2015 11:32 PM
    • Replies: 1
    • Views: 1,477
    01-28-2015, 04:18 AM Go to last post
  44. Planned contrasts in Friedman's ANOVA

    Is it possible to investigate planned contrasts in Friedman's ANOVA or is it only possible to investigate pairwise comparisons? Thank you for your...

    Started by Konstantin‎, 01-26-2015 01:35 PM
    friedman test, friedman's anova, non-parametric anova, planned comparisons, planned contrasts
    • Replies: 0
    • Views: 2,048
    01-26-2015, 01:35 PM Go to last post
  45. Types of Predictive Models

    Among the predictive models there are some, 1. which deliver exactly one solution for the estimation problem (e.g. regression, GLM, ...) 2....

    Started by consuli‎, 01-26-2015 08:50 AM
    • Replies: 0
    • Views: 1,251
    01-26-2015, 08:50 AM Go to last post
  46. General Term for Models with Dependend and Independend Variables

    Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

    Started by consuli‎, 01-24-2015 09:42 AM
    • Replies: 3
    • Views: 2,656
    01-26-2015, 06:44 AM Go to last post
  47. Bang and Tsiatis - t-test after?

    I have a treatment group and a control group (as a result of a matched cohort). I am comparing 12 month costs for a program but since not everyone...

    Started by lancearmstrong1313‎, 01-23-2015 01:24 PM
    • Replies: 2
    • Views: 1,485
    01-26-2015, 06:30 AM Go to last post
  48. help calculating needed sample size

    hi im conducting a study on a certain ratio in a blood exam (lets call it X) . I aim to say that there is a certain sensitivity (let say>80%) for...

    Started by urilee‎, 01-25-2015 04:22 AM
    • Replies: 0
    • Views: 1,171
    01-25-2015, 04:22 AM Go to last post
  49. A question regarding Cronbach's Alpha

    Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

    Started by graphicsgriffin‎, 09-18-2011 06:25 AM
    • Replies: 2
    • Views: 2,593
    01-24-2015, 03:18 PM Go to last post
  50. Comparing Likert items. What test should I use?

    Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

    Started by RDW‎, 01-23-2015 09:09 AM
    • Replies: 3
    • Views: 1,925
    01-24-2015, 07:59 AM Go to last post
  51. Test to compare difference between median value in two discrete samples

    Hi, I have two collection of ordinal samples for a discrete variable related to two administration of an experiment. Using Kolmogorov-Smirnov, I...

    Started by Vito_Mangh‎, 01-22-2015 10:59 AM
    discrete vc comparison, inference, mann-whitney test, test hypothesis, wilcoxon rank sum test
    • Replies: 1
    • Views: 1,615
    01-22-2015, 11:20 AM Go to last post
  52. Factor Analysis and Cronbach Alpha

    Hi, I would like to ask you about type of data which can be used for factor analysis or for control internal reliability (Cronbach Alpha). I'm...

    Started by langouste‎, 01-18-2015 04:08 PM
    • Replies: 0
    • Views: 1,948
    01-18-2015, 04:08 PM Go to last post
  53. Need help with growth model

    Hi, I have a research question that I am not sure how I should answer it. I think I may have to use growth model, but not sure! I appreciate your...

    Started by anna_258‎, 01-16-2015 04:56 AM
    • Replies: 0
    • Views: 1,241
    01-16-2015, 04:56 AM Go to last post
  54. Propagation of Poisson Errors

    How do I combine the asymmetrical errors when I subtract my samples from the controls? I know my low counts follow a Poisson distribution and...

    Started by nbryan5‎, 01-15-2015 11:13 PM
    error propagation, poisson
    • Replies: 1
    • Views: 1,727
    01-15-2015, 11:27 PM Go to last post
  55. Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

    Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

    Started by dmorga‎, 01-15-2015 03:13 AM
    sem, z-scores
    • Replies: 4
    • Views: 4,899
    01-15-2015, 11:27 AM Go to last post
  56. Over-simple Stats?

    Hi all, This should hopefully be a really simple question but I think I am confusing myself over a throwaway comment that someone made.... Say...

    Started by smcdougall‎, 01-14-2015 11:35 AM
    hierarchical, multi level
    • Replies: 5
    • Views: 1,562
    01-15-2015, 09:16 AM Go to last post
  57. Correlation significance critical values

    I've been trying to determine the critical value for a sample size of 168 but all the tables only indicate values up to 100 (most of them). Is there...

    Started by globaljaco‎, 01-15-2015 07:50 AM
    • Replies: 1
    • Views: 1,389
    01-15-2015, 08:41 AM Go to last post
  58. Appropriate test for two treatment types with zero-inflated data

    Hello all, I am trying to determine if there is a difference in falcon abundance between inside a forest reserve and outside the reserve. I ran...

    Started by mbwaterdog‎, 01-14-2015 05:20 PM
    • Replies: 1
    • Views: 1,343
    01-14-2015, 06:48 PM Go to last post
  59. Latent indicators for SEM query

    Hello, I've recently had a paper using SEM models reviewed. In the model I had four latent variables each with >2 indicators. For each indicator...

    Started by loops22‎, 01-14-2015 10:54 AM
    • Replies: 0
    • Views: 1,124
    01-14-2015, 10:54 AM Go to last post
  60. risk-adjustment for patient characteristics for survey

    Hi, Does anyone have any experience conducting surveys. For some surveys in order to ensure sample characteristics is representative of...

    Started by proc1125‎, 01-13-2015 09:54 AM
    • Replies: 0
    • Views: 1,479
    01-13-2015, 09:54 AM Go to last post

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