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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: 18,636
    10-11-2014, 12:02 PM Go to last post
  1. Error propagation in integral with limits uncertainties

    Hallo, I have one concern that I think the community can help. I need to calculate the definite integral where the limits have their errors as...

    Started by jasq‎, 06-21-2013 08:06 AM
    • Replies: 2
    • Views: 5,508
    06-23-2013, 03:16 AM Go to last post
  2. Survey analysis help: what tests to run?

    I'm doing research investigating why South Korean students are reluctant to speak English in ESL classes. I've developed a survey with nine...

    Started by Noraft‎, 11-18-2008 10:55 PM
    • Replies: 2
    • Views: 5,503
    11-19-2008, 05:28 AM Go to last post
  3. Question Changing from 5-point to 3-point scale

    We are considering changing our guest satisfaction survey from a 5-point scale to a 3-point scale. What is the likely affect on "Top Box" scores? In...

    Started by Redhat‎, 03-26-2009 08:12 AM
    • Replies: 0
    • Views: 5,499
    03-26-2009, 08:12 AM Go to last post
  4. 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: 5,475
    03-05-2013, 11:42 AM Go to last post
  5. Representing a distance measure with math equation

    I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

    Started by trinker‎, 11-10-2013 09:56 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 5,475
    11-11-2013, 04:54 PM Go to last post
  6. cramers v and level of significance interpretation

    Hey guys :) I have been searching for hours in books, forums and on the internet but I can't find answers to my questions, so you are my last...

    Started by Anschi7591‎, 08-24-2013 11:00 AM
    • Replies: 1
    • Views: 5,469
    08-25-2013, 01:12 AM Go to last post
  7. Wink Logistic regression question

    Hi, I have a large data set (over 1 million cases) and I put in approximately 5 to 10 IV that are all categorical. I am not getting a...

    Started by edgemont1‎, 10-19-2011 03:27 PM
    • Replies: 11
    • Views: 5,468
    10-20-2011, 11:11 AM Go to last post
  8. alternative to anova

    What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

    Started by deardirestraits‎, 12-15-2011 03:37 PM
    • Replies: 10
    • Views: 5,455
    12-16-2011, 09:43 PM Go to last post
  9. Problems with ANOVA Assumptions and I don't think Kruska Wallis will help

    I am conducting an experiment with four independent variables each of which has three or more factor levels. The sample size is quite large i.e....

    Started by wwreith‎, 08-02-2010 08:54 AM
    • Replies: 1
    • Views: 5,442
    08-03-2010, 01:01 PM Go to last post
  10. Rotation in Principal Components Analysis

    Hi, I was wondering if anybody could give me some general advice on a specific issue. Is it possible to orthogonally (varimax) rotate when...

    Started by DanWeaving‎, 01-08-2014 12:36 PM
    • Replies: 7
    • Views: 5,395
    01-14-2014, 08:18 AM Go to last post
  11. How to calculate credibility interval limits

    Hi everyone. My name is Choi. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting...

    Started by aamssa‎, 09-14-2011 02:52 AM
    • Replies: 2
    • Views: 5,393
    09-14-2011, 09:32 PM Go to last post
  12. Hypothesis testing

    conduct a hypotheses text for each sample at the .01 level of significance and what action should be taken provide the test statistic and p-value for...

    Started by rock9449‎, 08-02-2008 08:49 PM
    • Replies: 4
    • Views: 5,373
    08-03-2008, 06:52 PM Go to last post
  13. non-parametric test for repeated measurement

    Hello everyone, I would like to know if some non-parametric test is available to asses wether 2 samples come from the same distribution for repeated...

    Started by alstublieft‎, 11-14-2008 11:16 AM
    • Replies: 4
    • Views: 5,356
    11-17-2008, 04:34 AM Go to last post
  14. Interpreting moderation output

    Hi everyone, I am hoping for some help understanding output of an moderation analysis. In my experiment I have:- - 1 IV - 3 level...

    Started by Tilly01‎, 10-06-2011 06:30 AM
    • Replies: 1
    • Views: 5,349
    10-07-2011, 10:25 AM Go to last post
  15. Is Levene's transformation with ANOVA equivalent to Levene's W?

    Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

    Started by amesshaps‎, 03-25-2011 09:36 PM
    anova, levene's test
    • Replies: 0
    • Views: 5,336
    03-25-2011, 09:36 PM Go to last post
  16. interaction plot in logistic regression

    Dear All Hi I am Amir from Iran where we have no a well know psychologist especially in quantitative. I am working on a data with a dummy variable...

    Started by amirpakpour‎, 08-06-2013 07:04 PM
    • Replies: 1
    • Views: 5,320
    08-06-2013, 09:30 PM Go to last post
  17. another MLE please

    f(x)=e^-(x-\theta) -(x-\theta) is the exponent x>\theta I need to find MLE for \theta I tried doing it with a graph, but I got strange...

    Started by WeeG‎, 06-09-2010 09:33 AM
    • Replies: 4
    • Views: 5,314
    06-09-2010, 02:09 PM Go to last post
  18. Correct method for determining group membership

    Hi, I am doing some research into what determines whether or not people gain an educational qualification in later life. My thought was to run...

    Started by lmsava‎, 07-20-2011 10:42 AM
    • Replies: 8
    • Views: 5,289
    07-29-2011, 07:03 AM Go to last post
  19. Thumbs up Would you help me? (Tranformations)

    Hi, I was looking for tranformations for ratio data. I find that arcsine tranformation is adecuate for that kind of data (ratio). For that...

    Started by sureño‎, 05-07-2012 07:50 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,286
    06-06-2012, 09:07 AM Go to last post
  20. multiple groups & dichotomous responses

    I have a set of data from a number of countries where interviewees have answered simple yes/no questions. The "DV" is, in other words, 1 or 0, and...

    Started by pjotr66‎, 07-09-2010 04:02 AM
    • Replies: 8
    • Views: 5,281
    07-16-2010, 10:29 AM Go to last post
  21. Z-test for different proportions: why are they all sig. different?

    Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

    Started by MarilynCM‎, 10-03-2010 11:31 AM
    • Replies: 5
    • Views: 5,274
    10-03-2010, 06:56 PM Go to last post
  22. Granger Causality test help!

    I have run a Granger causality test on two time series but im not sure based on the output whether or not to reject the null hypothesis. Below is the...

    Started by ross781‎, 02-21-2009 01:38 PM
    • Replies: 0
    • Views: 5,241
    02-21-2009, 01:38 PM Go to last post
  23. Choosing Statistical Tests for a Study

    I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

    Started by mariejolene‎, 03-22-2011 12:09 AM
    • Replies: 8
    • Views: 5,235
    03-28-2011, 11:41 PM Go to last post
  24. Measuring Neural Network Performance

    Hi all, I have a set of matrix where the last column is the RESPONSE VECTOR. I have performed a backprop NN (neural network) in order to...

    Started by akmaltk96‎, 07-07-2008 09:11 PM
    • Replies: 4
    • Views: 5,223
    12-21-2009, 04:14 PM Go to last post
  25. Multivariate Statistics: Which is appropriate PCA, DFA, MANCOVA?

    Hello there, I am trying to determine which multivariate statistical techniques are most appropriate to address my biological questions and type...

    Started by lophodont‎, 01-12-2009 04:15 PM
    • Replies: 0
    • Views: 5,210
    01-12-2009, 04:15 PM Go to last post
  26. Help on Factor analysis and Extension

    Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

    Started by amjath‎, 01-21-2009 05:08 PM
    • Replies: 8
    • Views: 5,210
    01-26-2009, 12:28 PM Go to last post
  27. Cut-off criterion for likert scales

    Dear all, I really need some help solving the following problem: I am currently finalizing my master thesis and I am still insecure about a...

    Started by Amowiel‎, 11-18-2010 04:47 AM
    • Replies: 0
    • Views: 5,200
    11-18-2010, 04:47 AM Go to last post
  28. Time Series Dummy Variable and Time Trend

    Hi, I currently have some research going on that requires me to put in a time trend variable t = {1,2,3,4,.....,N} where N is the total number of...

    Started by dannylimstata‎, 05-01-2012 11:55 PM
    • Replies: 1
    • Views: 5,180
    05-02-2012, 12:04 AM Go to last post
  29. Is it meaningful to calculate a p-value based on a convenience sample?

    Ignore the bootstrap as a possibility. If the answer is no, then what is the point of stating the p-value (especially if it is, say, 0.10)?

    Started by woodbomb‎, 01-12-2016 09:18 AM
    2 Pages
    1 2
    convenience, p-value, significance
    • Replies: 20
    • Views: 5,179
    01-16-2016, 05:47 PM Go to last post
  30. Multivariate Normality

    I have a data set I am going to use SEM on. Each of the variables seems to have acceptable skewness and kurtosis (using cutoffs of 3 and 10 on...

    Started by xralphyx‎, 10-03-2012 09:59 AM
    • Replies: 2
    • Views: 5,178
    04-25-2014, 01:03 AM Go to last post
  31. Cumulative Periodogram

    Hello, As part of my master's research, I am exploring a cyclic pattern in daily climate data (latent heat flux). To explore this pattern, I...

    Started by hpants24‎, 12-07-2010 10:40 PM
    • Replies: 1
    • Views: 5,169
    10-20-2013, 11:17 PM Go to last post
  32. Right Sample Size

    I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

    Started by bsaikrishna‎, 11-03-2010 10:46 AM
    • Replies: 5
    • Views: 5,159
    11-04-2010, 12:12 PM Go to last post
  33. Question Q-Q plot

    The Q-Q plot is more sensitive to deviances from normality in the tails of the distribution, whereas the normal probability plot is more sensitive to...

    Started by SadieKhan‎, 10-26-2010 07:21 AM
    • Replies: 1
    • Views: 5,157
    10-26-2010, 07:24 AM Go to last post
  34. Test-retest repeatability

    Hello, I have some questions regarding the use of ICC (intraclass correlation coefficient) to measure the repeatability of a 146-item...

    Started by amel21‎, 11-22-2010 08:38 AM
    • Replies: 0
    • Views: 5,148
    11-22-2010, 08:38 AM Go to last post
  35. Fitting Archimedean copula

    hello, I am attempting to fit an archimedean copula in R, clayton specifically. I attempt to use the fit.AC function. I get the following...

    Started by vandypimp‎, 11-22-2010 10:45 PM
    • Replies: 2
    • Views: 5,146
    12-23-2010, 08:31 PM Go to last post
  36. How to generate right censored data

    Hi all, I want to generate some data from a given distribution, let say exponential distribution. But I do not now how. Any help would be...

    Started by amin.hassanzadeh‎, 05-27-2009 04:18 PM
    • Replies: 1
    • Views: 5,143
    05-27-2009, 04:34 PM Go to last post
  37. Question about phi range in AR(1) process

    Hello, Makridakis Forecasting text book says that phi should be restricted to -1<phi<1. I thought that this restriction should exist only if we...

    Started by zarasandreas‎, 09-08-2011 04:29 AM
    • Replies: 4
    • Views: 5,142
    09-08-2011, 02:08 PM Go to last post
  38. Hierarchical Cluster Analysis: which method to use?

    Hi all, I have a data set consisting of 32 records (linguistic constructions) and count data on how often each construction is used for each of 5...

    Started by nsmit1‎, 01-28-2009 08:00 AM
    • Replies: 2
    • Views: 5,141
    01-29-2009, 04:49 AM Go to last post
  39. Z-scores with non-normal data

    Hi, I am reviewing someone's study in which they used z-scores to standardize and compare data. I see no mention of their test for normality and...

    Started by budgie81‎, 06-06-2013 07:35 AM
    normal distribution, transformation, z score
    • Replies: 1
    • Views: 5,141
    06-06-2013, 07:46 AM Go to last post
  40. Need help on normalizing data

    I have very limited knowledge on statistics, but I need to approach the following question, can any expert here show how to approach it? I have 2...

    Started by danyu‎, 12-15-2011 03:33 PM
    • Replies: 3
    • Views: 5,139
    12-15-2011, 04:17 PM Go to last post
  41. Calculation of Autocorrelation

    Hello, I have a data set of which i calcualte the autocorrelation at lag 1 in SAS ETS (Proc Arima) and SPSS. Then i try to calculate the...

    Started by zarasandreas‎, 11-18-2011 03:09 AM
    • Replies: 2
    • Views: 5,138
    11-18-2011, 09:36 AM Go to last post
  42. Trouble interpreting Fairlie's Decomposition Method in Stata

    Hi all, I am having trouble interpreting the fairlie decomposition method in Stata. I am interested in applying the procedure in identifying...

    Started by eemrun‎, 06-09-2012 10:06 AM
    • Replies: 1
    • Views: 5,126
    07-16-2012, 04:35 AM Go to last post
  43. Shapiro-Wilk normality test: what is the null distribution

    Hi everyone The Title says it all. I'd like to know what is the null distribution of the Shapiro-Wilk test statistic. I'm also curious to see it's...

    Started by longrob‎, 09-07-2011 09:10 AM
    • Replies: 4
    • Views: 5,124
    09-08-2011, 04:16 AM Go to last post
  44. How to do a Validation Study?

    My professor has asked me to do a validation study but I have never done one before and don't know what methodology or statistics to use. Basically...

    Started by amber82‎, 12-16-2014 11:44 PM
    methodology, scales, validate scale, validation
    • Replies: 1
    • Views: 5,115
    12-17-2014, 01:05 AM Go to last post
  45. Football (Soccer) Betting Model Inference

    British Football (Soccer) Betting Model Inference Hi,Guys! I am not a statistician, so please forgive me if I miss some points (which I surely...

    Started by Valen‎, 01-06-2011 11:02 AM
    • Replies: 2
    • Views: 5,111
    01-06-2011, 01:12 PM Go to last post
  46. How does sampling reduce selection bias?

    Hi everyone, I'm struggling to understand theoretically how sampling reduces selection bias. Take the following example: Supposing there is a...

    Started by phil7686‎, 06-01-2012 03:37 PM
    sampling, selection bias
    • Replies: 1
    • Views: 5,110
    06-04-2012, 08:32 PM Go to last post
  47. Smile What is booster sampling?

    We are doing convenient sampling rather than random sampling for a research that we are conducting. The authority is concerned about the reliability...

    Started by Imtiaztherockerboy‎, 05-29-2014 01:21 AM
    booster, design, research, sample, sampling
    • Replies: 1
    • Views: 5,109
    05-29-2014, 01:47 AM Go to last post
  48. Using measures with different Likert-type scaling

    I need some advice regarding methodology. I am creating a single questionnaire comprised of 4 different measures - all with likert-type scaling. ...

    Started by Nebulous13‎, 08-15-2010 01:08 PM
    • Replies: 3
    • Views: 5,108
    08-19-2010, 12:28 AM Go to last post
  49. Im struggling -What post-hoc analysis tests?

    Hi Guys I’m new here and really hope you can help me out! I’m having a struggle with some research data and have done the first part of some...

    Started by lilly‎, 02-16-2012 04:22 PM
    • Replies: 6
    • Views: 5,101
    02-20-2012, 12:30 PM Go to last post
  50. Gpower

    I'm wanting to run a study where I record motor evoked potentials evoked from a group of participants they view images of people performing reach and...

    Started by _Craig_‎, 09-23-2009 01:15 PM
    • Replies: 2
    • Views: 5,085
    01-11-2011, 08:28 AM Go to last post
  51. Question non-parametric version of a two-factor repeated measure ANOVA

    Hi everyone, I had planned to perform a two-factor repeated measure ANOVA on the data that I have, but the data that I am using is not normally...

    Started by min.emerg‎, 09-11-2011 08:02 AM
    • Replies: 4
    • Views: 5,080
    09-11-2011, 11:07 AM Go to last post
  52. analyse of likert scale confusion please help

    Hello I am conducting research into how behvaviour changes from year 1 to year 2 of study on a college course. I have provided students with a...

    Started by mhowells3‎, 02-23-2011 05:22 PM
    • Replies: 9
    • Views: 5,076
    08-23-2011, 07:58 PM Go to last post
  53. Exchangeable or Unstructured GEE

    Hi all, I was wondering if someone can give me a clear understanding on the difference between exchangeable working correlation matrix and...

    Started by PenguinM‎, 06-06-2014 07:40 AM
    gee
    • Replies: 1
    • Views: 5,067
    06-06-2014, 08:07 AM Go to last post
  54. A Non parametric equivelent to mixed anova?

    Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

    Started by Elaine98‎, 08-14-2010 07:33 AM
    • Replies: 1
    • Views: 5,056
    08-14-2010, 09:36 AM Go to last post
  55. Spearman-Brown also for the effect of additional raters?

    To achieve higher reliability in a questionnaire, it is common to add more items to the questionnaire. If the new items are parallel to the previous...

    Started by Per‎, 07-26-2010 02:04 AM
    • Replies: 5
    • Views: 5,045
    09-23-2010, 04:14 AM Go to last post
  56. Urgent-Statistical Test comparing means of unknown distributions

    Is there a non-parametric test with which one can reject the null hypothesis of an equal mean (μ1 = μ2) between two sample distributions, over an...

    Started by moudatsos‎, 09-29-2008 01:31 PM
    • Replies: 1
    • Views: 5,042
    10-04-2008, 02:40 PM Go to last post
  57. Exclamation God you people are clever!

    Hi, :wave: I'm collecting data from a single group of 15 participants showing their improvement in a 5 stage levelled test before and after an...

    Started by help me!‎, 01-05-2010 02:30 PM
    • Replies: 5
    • Views: 5,039
    05-08-2010, 12:52 AM Go to last post
  58. Mean change over time attriubted to another variable

    The following is the research question that was posed to me: How much of impact on the increase in satisfaction over last year can be attributed...

    Started by t_star‎, 09-26-2011 09:24 AM
    • Replies: 8
    • Views: 5,032
    09-28-2011, 04:34 PM Go to last post
  59. Two Stage Least Squares Regression

    I am trying to test a model and have been advised that 2SLS is the appropriate method. I am using SPSS which has the 2SLS option. My problem is that...

    Started by Lisa‎, 10-19-2008 06:35 AM
    • Replies: 0
    • Views: 5,010
    10-19-2008, 06:35 AM Go to last post
  60. gender differences

    Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

    Started by 12345678‎, 04-10-2009 01:08 AM
    • Replies: 6
    • Views: 4,999
    05-09-2009, 07:40 PM Go to last post

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