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Threads 1681 to 1740 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: 18,765
    10-11-2014, 12:02 PM Go to last post
  1. T-test question

    Hi there. I have one Q need some advice on it. In my research, I have 2 national groups (British and Saudi) and I need to compare between them in...

    Started by ghada8888‎, 11-08-2012 01:24 PM
    • Replies: 7
    • Views: 1,888
    11-28-2012, 11:44 PM Go to last post
  2. Average minute rating can be modeled by poisson?

    Dear All, Here is my question with an example. I am trying to understand the tv channel rating data. The data measures the tv watchers...

    Started by masarimk‎, 11-28-2012 11:13 AM
    • Replies: 6
    • Views: 1,174
    11-28-2012, 11:57 AM Go to last post
  3. Justification for Levene's test?

    Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

    Started by emily.stats‎, 11-22-2012 09:31 AM
    • Replies: 7
    • Views: 3,062
    11-28-2012, 06:27 AM Go to last post
  4. Customer satisfaction survey (data analysis)

    Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

    Started by lassekk‎, 11-27-2012 05:33 AM
    • Replies: 5
    • Views: 3,249
    11-28-2012, 02:13 AM Go to last post
  5. Modeling Rate Of Arrival At An Event

    I'm trying to model the rate at which people arrive at a football match. I have throughput data from about 20 matches showing the number of people...

    Started by johnsayce‎, 11-24-2012 12:23 PM
    • Replies: 6
    • Views: 1,608
    11-27-2012, 11:51 AM Go to last post
  6. Bayesian vs. Frequentist for the applied researcher

    There's been a lot of talk about Bayes lately in my life, talkstats, class, articles etc. I feel like it's becoming something researchers can't hide...

    Started by trinker‎, 11-25-2012 07:57 PM
    • Replies: 2
    • Views: 1,795
    11-26-2012, 07:30 PM Go to last post
  7. Question [[ Which stats test(s) for assessing relative weights using ranked (ordinal) data? ]]

    Hello forum, I've been mulling this problem over for a while and getting nowhere with it (generating more questions than answers) so I thought I'd...

    Started by kaia‎, 11-25-2012 09:48 AM
    • Replies: 0
    • Views: 1,699
    11-25-2012, 09:48 AM Go to last post
  8. Customer problems vs R&D efficiency -> Statistic needed

    Hi guys, I have one case for which I need to find out how to prepare some statistic but to be honest I do not now how to approach the issues. ...

    Started by bciepluch‎, 11-23-2012 07:59 AM
    • Replies: 1
    • Views: 1,038
    11-24-2012, 07:55 AM Go to last post
  9. Calculating weighted mean & SD from multiple group data

    I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

    Started by asf‎, 11-19-2012 08:50 PM
    • Replies: 2
    • Views: 4,776
    11-21-2012, 07:47 PM Go to last post
  10. sample size estimation

    Dear All, I know that we can find the sample size formula from n=/me^2 but if the survey has 5 questions which two of them yes/no and 3 of them ...

    Started by masarimk‎, 11-19-2012 11:52 AM
    • Replies: 4
    • Views: 1,868
    11-20-2012, 01:20 PM Go to last post
  11. Measuring the impact of nearest-neighbour imputation.

    I am working on survey data, with missing values imputed using a nearest neighbour method. I am currently interested in assessing the effect of...

    Started by an1couk‎, 11-19-2012 03:50 PM
    • Replies: 0
    • Views: 1,347
    11-19-2012, 03:50 PM Go to last post
  12. Generating Beta binomial random variables

    Hi, I am looking for the theoretical method/algorithms to generate beta-binomial random variables. I would like to kindly request you to suggest...

    Started by arun‎, 11-19-2012 10:17 AM
    beta binomial, generation
    • Replies: 0
    • Views: 1,198
    11-19-2012, 10:17 AM Go to last post
  13. How to calculate sample size with low event frequency

    How do I calculate the sample size with a really low event frequency. I have a population of 2^32 with an unknown distribution. But a event...

    Started by battler‎, 11-17-2012 06:45 AM
    • Replies: 1
    • Views: 1,883
    11-17-2012, 01:40 PM Go to last post
  14. Question Help With The Preffered Package Type Assessment

    Hello there to everyone! I have the question concerning the underlying data analysis methodology. Here is the small introduction. There is a data...

    Started by antivanov‎, 11-12-2012 05:11 PM
    cluster analysis, data analysis, methodology, regession
    • Replies: 2
    • Views: 1,393
    11-15-2012, 12:45 PM Go to last post
  15. deriving critical level of significance for Bonferroni correction in my data?

    We have conducted an experiment where we test ability to detect weights using two different methods using a repeated measures design. Each...

    Started by j482‎, 11-15-2012 07:44 AM
    boneferroni correction, friendmans anova, number of comparisions, post-hoc
    • Replies: 1
    • Views: 1,375
    11-15-2012, 10:10 AM Go to last post
  16. GLS in MATLAB

    Hi, Can anybody help me to solve a simultaneous equation model with Generalised least square in MATLAB?

    Started by poulamibhattacharjee‎, 11-15-2012 03:12 AM
    • Replies: 0
    • Views: 3,716
    11-15-2012, 03:12 AM Go to last post
  17. Does A Low Power In A Study Increase Type I Error Probability?

    Two statisticians in a forum (not here) are claiming that the probability of a Type I error increases when the study is small. They argue that a...

    Started by Musibrique‎, 11-09-2012 11:04 AM
    • Replies: 8
    • Views: 9,898
    11-13-2012, 01:22 PM Go to last post
  18. Wich data analysis to choose for my data?!

    Hello to everyone, I'm new on this forum and I thank the team for this site. Actually I'm working with some data and I don't know which can be the...

    Started by tsdl‎, 11-09-2012 07:47 PM
    • Replies: 5
    • Views: 1,783
    11-13-2012, 09:40 AM Go to last post
  19. Effect size and Significance

    I want to use Students' Treatment Total Score and Control Group Total Score, and measure 'difference between the scores'. And then I want to measure...

    Started by eunkum‎, 11-12-2012 05:49 PM
    • Replies: 0
    • Views: 1,068
    11-12-2012, 05:49 PM Go to last post
  20. Help with Customer Satisfaction data analysis (Correlation/ANOVA)

    I'm working on an analysis of a customer satisfaction survey, where I'm trying analyze the link between respondent's stated likelihood to recommend...

    Started by mpschulm‎, 11-11-2012 09:03 PM
    anova, correlation, customer satisfaction, net promoter score
    • Replies: 1
    • Views: 3,265
    11-12-2012, 09:19 AM Go to last post
  21. Question Non normal likert scale Data?

    Hello all, I have a problem with stats procedures for a research paper. I have a sample size of 379 respondents with data collected with a 5...

    Started by Tai‎, 03-29-2012 03:42 AM
    • Replies: 5
    • Views: 10,369
    11-12-2012, 04:03 AM Go to last post
  22. Help with real estate statistics.

    I am a real estate appraiser in California. I want to conduct a study that will tell me what certain aspects of properties, like bedrooms, square...

    Started by ablackburn‎, 11-11-2012 11:28 AM
    home, real estate, statisics
    • Replies: 2
    • Views: 1,336
    11-11-2012, 03:25 PM Go to last post
  23. Paired t-test is significant and ANOVA is not, on what should I rely?

    Hello.. I have a question I hope someone can help me with. In my study, I have to groups; treatment group and a control (placebo) group, and I...

    Started by Isra'a‎, 11-10-2012 05:46 PM
    • Replies: 5
    • Views: 1,924
    11-11-2012, 10:05 AM Go to last post
  24. Best rating scale to use for my research?

    Don't worry about it.

    Started by liverpool‎, 11-10-2012 11:14 PM
    • Replies: 0
    • Views: 1,020
    11-10-2012, 11:14 PM Go to last post
  25. Interpretation of Autocorrelation

    Hi, I have a question regarding the autocorrelation of time series. In my computation (using a software package) the first coefficient yields...

    Started by Dolphin72‎, 11-10-2012 01:08 AM
    • Replies: 0
    • Views: 2,079
    11-10-2012, 01:08 AM Go to last post
  26. repeated measures - data comparisons

    Hello and thanks for reading. I'm conducting psychological research and am measuring a range of variables at four measurement points...

    Started by Laf‎, 11-09-2012 05:15 PM
    methodology, psychology experiment, repeated measures
    • Replies: 0
    • Views: 1,144
    11-09-2012, 05:15 PM Go to last post
  27. Violation?: Comparing group mean to population mean

    Greetings! I was hoping you guys could help me out with a problem. Im curious to know how one would go about attacking a problem like this. I...

    Started by Doodnauth‎, 11-09-2012 08:42 AM
    • Replies: 0
    • Views: 3,491
    11-09-2012, 08:42 AM Go to last post
  28. Question Help! Selection of statistical methods for experiment

    Hello everyone. I need help with the selection of statistical methods for one experiment. I'm a total newbie to the statistics :yup: So, I need to...

    Started by djomla‎, 11-07-2012 06:15 PM
    • Replies: 0
    • Views: 1,047
    11-07-2012, 06:15 PM Go to last post
  29. Group comparisons using Kruskal-Wallis AND a categorical mediator?

    Hi there, I have four patient groups which I compare in terms of a contiuous variable using Kruskal-Wallis (due to small sample sizes and...

    Started by MVTamburini‎, 11-07-2012 06:39 AM
    • Replies: 0
    • Views: 1,168
    11-07-2012, 06:39 AM Go to last post
  30. Distribution of estimator (exponential distribution; truncated at both ends)

    Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

    Started by chippy‎, 07-13-2012 07:42 AM
    • Replies: 3
    • Views: 1,687
    11-05-2012, 01:57 PM Go to last post
  31. Bootstrap bias

    Good day forum, I'm using a bootstrap approach to get a better understanding of a sampling distribution. I've heard that the bootstrap approach...

    Started by chippy‎, 11-05-2012 01:49 PM
    bias, bootstrap, sampling distribution
    • Replies: 0
    • Views: 1,153
    11-05-2012, 01:49 PM Go to last post
  32. differences between values a meaningful unit (I like cake too)

    Alright I'm still working away on my problem of distance between different types of behavior. I can calculate distances between occurrences and spit...

    Started by trinker‎, 11-02-2012 09:00 PM
    • Replies: 11
    • Views: 2,020
    11-04-2012, 01:01 AM Go to last post
  33. Quality Control with statistics

    I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

    Started by Dan1234‎, 11-02-2012 11:14 AM
    • Replies: 0
    • Views: 908
    11-02-2012, 11:14 AM Go to last post
  34. Frequency data analysis - repeated measures, between groups

    Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

    Started by Alice‎, 10-28-2012 08:35 PM
    • Replies: 3
    • Views: 1,483
    11-01-2012, 06:17 PM Go to last post
  35. Growth Curve Modeling and Covariates

    Hi All, I am in the midst of trying to work out an issue I am having with my model. I have an environmental variable that I want to use as a...

    Started by jazzman19‎, 11-01-2012 01:18 PM
    • Replies: 0
    • Views: 989
    11-01-2012, 01:18 PM Go to last post
  36. Which tests do I have to use in order to test my hypotheses?

    Dear sir/madam, I would like to test these hypotheses, but I'm still not sure which test I should use for it. Can anybody help me? Thanks...

    Started by Nadia1908‎, 10-29-2012 10:27 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 3,863
    11-01-2012, 01:09 PM Go to last post
  37. nonparametric test for Two-way repeated measures ANOVA?

    What is a nonparametric test for Two-way repeated measures ANOVA?

    Started by eunkum‎, 11-01-2012 12:14 PM
    • Replies: 0
    • Views: 8,732
    11-01-2012, 12:14 PM Go to last post
  38. Choosing Kruskal–Wallis test for group comparison with unequal sizes

    I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

    Started by btomatoe‎, 10-31-2012 01:14 AM
    • Replies: 2
    • Views: 28,082
    10-31-2012, 08:10 PM Go to last post
  39. What Exactly Constitues A Valid Meta-Analysis?

    Throughout my further studies in statistics, I was always concerned on what exactly makes a meta-analysis a valid meta-analysis. When I began my...

    Started by Musibrique‎, 10-30-2012 01:47 PM
    • Replies: 4
    • Views: 1,935
    10-31-2012, 01:55 PM Go to last post
  40. How do t-test when I normalize one of the data sets?

    Hi everyone! I have three proteins, let's call them A B & C. B and C are mutated forms of A. I test the activity of A B & C three times....

    Started by joppe‎, 10-30-2012 06:03 PM
    • Replies: 0
    • Views: 4,583
    10-30-2012, 06:03 PM Go to last post
  41. How does observation error effect a minimal sample size for a t test?

    Hello, I calculate minimal sample size to compare means of two groups (different treatment) of datapoints by a t test. For continuously...

    Started by bondsergey‎, 10-26-2012 12:11 PM
    • Replies: 7
    • Views: 2,005
    10-30-2012, 05:54 PM Go to last post
  42. small sample size

    Hi! I want to compare 27 groups with each other, with each group consisting out of 3 or 4 samples. Can I use a one-way ANOVA or Kruskal-Wallis test...

    Started by Ine‎, 08-22-2012 07:06 AM
    • Replies: 7
    • Views: 1,586
    10-30-2012, 12:03 AM Go to last post
  43. Giving statistical significance to the max value of a vector

    Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

    Started by danny‎, 10-23-2012 03:11 AM
    • Replies: 4
    • Views: 1,951
    10-29-2012, 11:32 AM Go to last post
  44. Methods help: How to find significant differences between groups with ordinal data?

    In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

    Started by hrh2101‎, 10-20-2012 10:39 PM
    • Replies: 3
    • Views: 2,653
    10-26-2012, 11:32 AM Go to last post
  45. Question 2x2 Repeated Measures ANOVA

    Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

    Started by Pedro‎, 10-25-2012 05:46 PM
    anova, two way
    • Replies: 4
    • Views: 3,153
    10-26-2012, 09:02 AM Go to last post
  46. Post hoc analysis: how to determine if sample size was sufficient and level of power

    Having difficulty downloading statistical sample/power calculators and have no allocated stats help. Need to find out the following: 1. ...

    Started by Aussnorway‎, 10-26-2012 05:06 AM
    • Replies: 0
    • Views: 1,801
    10-26-2012, 05:06 AM Go to last post
  47. How to find minimal sample size in my case to compare means of 2 groups by t-test?

    Hello, please help. I have 2 groups of people (treated with a drug and untreated). I measure percentage of green cells among particular type of...

    Started by bondsergey‎, 10-20-2012 05:57 PM
    • Replies: 4
    • Views: 1,961
    10-25-2012, 06:03 AM Go to last post
  48. Appropriateness of logistic regression

    Hello, I am interested in the effects of gender on a set of variables. I have run a number of group mean t tests (with gender as the group...

    Started by jesse‎, 10-24-2012 07:14 AM
    dummy variable, logistic regression
    • Replies: 2
    • Views: 2,265
    10-24-2012, 08:04 AM Go to last post
  49. Trying to compose a single probability value from sampling an "online" source

    Hi, First at all, the presentations: I have recently found this forum surfing the web, and it seems very very interesting and helpfully for an...

    Started by aviloria‎, 10-23-2012 02:18 PM
    • Replies: 1
    • Views: 1,278
    10-24-2012, 06:33 AM Go to last post
  50. How to create sampling weights?

    Hi all, I'll go directly to the point, and then try to clarify: How do I create reliable weights for a sample, that take account of the number...

    Started by Olleolle‎, 10-23-2012 04:01 AM
    • Replies: 2
    • Views: 2,595
    10-23-2012, 09:21 AM Go to last post
  51. Model Cross-Validation Issue: Comparing models w/ and w/o error

    Hi folks: I'm trying to apply cross-validation of models (e.g. the paper "On Cross-Validation of Bayesian Models" by Alqallaf and Gustafson) in the...

    Started by lostsoul‎, 10-09-2012 02:20 PM
    bayesian, count data, cross-validation, model selection, poisson regression
    • Replies: 1
    • Views: 1,315
    10-22-2012, 08:23 PM Go to last post
  52. Split Survey Design

    I will appreciate any advise/critique. The problem is as follows: I have 21 objects which define a context. For each object, I would like to...

    Started by statpuzz‎, 10-22-2012 03:08 PM
    • Replies: 2
    • Views: 1,136
    10-22-2012, 04:03 PM Go to last post
  53. Target Layer Activation Function of a Neural Netwrok with Ordinal Target (3 events)

    Hello, I have a neural network with an input layer, two hidden layer and one target layer. The target is binary (1,0). The activation function is...

    Started by zarasandreas‎, 10-22-2012 04:28 AM
    neural networks
    • Replies: 0
    • Views: 1,331
    10-22-2012, 04:28 AM Go to last post
  54. Survey Design

    Dear All, I would like to design a big survey. The population is around 70 million which is the whole country. The purpose of the design is to ask...

    Started by masarimk‎, 10-18-2012 02:52 AM
    survey design
    • Replies: 3
    • Views: 1,743
    10-22-2012, 01:18 AM Go to last post
  55. mixture of normals inequality

    Let C be a convex and compact set in R^n, and let T = {theta_1,...,theta_k} be a set of points not in C such that T and C are hyperplane separated. ...

    Started by student?‎, 10-16-2012 07:25 PM
    • Replies: 2
    • Views: 1,300
    10-19-2012, 06:20 PM Go to last post
  56. Best statistical analysis to use for my research (ANOVA or other correlation test)

    Greetings! I am new in this forum and I have very little knowledge in statistics. I have a research about air pollution. I get samples of air...

    Started by statisticsjn‎, 10-19-2012 06:25 AM
    anova, correlation, statistical method
    • Replies: 0
    • Views: 1,629
    10-19-2012, 06:25 AM Go to last post
  57. Limit of standard normal CDF(x) as x goes to ∞?

    Let N:\mathbb{R} \to be the CDF of the standard normal density function. I want to evaluate: \lim_{b\to 0^+} N(\frac{a}{b}). Clearly this is...

    Started by derksheng‎, 10-15-2012 10:32 PM
    • Replies: 12
    • Views: 95,322
    10-18-2012, 09:39 AM Go to last post
  58. Missing Data Analysis Question

    Hi gurus, I really appreciate some advise on handling missing values. Briefly, subjects rated 21 objects (obj 1 ...obj 21) on 14 attributes...

    Started by statpuzz‎, 10-16-2012 03:51 PM
    efa, imputation, missing data analysis, split questionnaire, spss syntax
    • Replies: 6
    • Views: 2,008
    10-18-2012, 09:26 AM Go to last post
  59. Question To combine or not to combine standard deviations?

    Hi, I'm testing the effect of 115 Chinese herbs on bacterial biofilms. I have been carrying out my experiment in microtiter plates and...

    Started by Hemmi‎, 10-11-2012 01:23 AM
    means, standard deviation
    • Replies: 3
    • Views: 2,005
    10-14-2012, 12:15 AM Go to last post
  60. Quasi-Experimentation

    I'm looking to learn more abut Quasi-Experimentation (as I believe it will come in great use at work). Currently I am thinking about purchasing the...

    Started by lancearmstrong1313‎, 10-12-2012 09:36 AM
    • Replies: 0
    • Views: 1,441
    10-12-2012, 09:36 AM Go to last post

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