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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: 18,756
    10-11-2014, 12:02 PM Go to last post
  1. 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: 5,118
    01-11-2011, 08:28 AM Go to last post
  2. demographic stats for choosing where to live

    Given the vast amount of demographic information on sites like: http://quickfacts.census.gov/qfd/index.html Could I could take a subset of...

    Started by kstus‎, 10-02-2009 02:27 PM
    • Replies: 2
    • Views: 2,350
    01-01-2010, 09:35 PM Go to last post
  3. Nonparametric regression

    Hi guys, can someone recommend a good source to learn about kernel regression or spline smoothing and perhaps how to compare two plots to each other?

    Started by chickduckduck‎, 11-16-2009 04:50 AM
    • Replies: 2
    • Views: 3,047
    11-17-2009, 01:06 AM Go to last post
  4. Percent Change

    What should I put for the % change if the beginning value is 0 and the final value is >0, other than "not applicable"?

    Started by yu78zer1‎, 03-08-2010 03:37 AM
    • Replies: 2
    • Views: 4,477
    03-16-2010, 01:38 AM Go to last post
  5. Choosing a model for categorical data

    Hi all, I'm not very familiar with working with categorical data. I would like to model a categorical response variable (nominal, three levels) as a...

    Started by Heidi Swanson‎, 03-09-2010 05:20 PM
    • Replies: 2
    • Views: 2,646
    03-17-2010, 03:59 PM Go to last post
  6. Generating correlated binary data

    Suppose I have a column of random binary numbers. I would like to find a way to generate a second column with the same number of cases that has a...

    Started by JEHP1846‎, 03-19-2010 04:49 PM
    • Replies: 2
    • Views: 3,422
    03-19-2010, 06:31 PM Go to last post
  7. Don't know where to start, please help

    :eek: Please any kind person help, as I am horribly stuck!!! I have a *very* large dataset (n>300,000 rows) of water readings in this format; ...

    Started by heather_s‎, 03-23-2010 12:30 AM
    • Replies: 2
    • Views: 2,224
    03-23-2010, 10:43 PM Go to last post
  8. Research for Student help please

    Hello all, I have to do a research report for part on my access course before degree in Sep. I have decided to study the effects of poverty...

    Started by Urban Colour‎, 04-09-2010 07:45 AM
    • Replies: 2
    • Views: 2,890
    04-09-2010, 09:40 AM Go to last post
  9. Multinomial Logistic Regression

    Does anyone knows how I can formulate a the link function of a multinomial logistic regression without using a base class teotjunk

    Started by teotjunk‎, 05-05-2010 06:12 AM
    • Replies: 2
    • Views: 3,633
    05-07-2010, 05:57 PM Go to last post
  10. Adding Random Variables from Logistic Distributions

    Given two logistic distributed random variable: ( mu_1, s_1 ) and ( mu_2, s_2 ) what is the sum of the variable? I tried monte carlo on (...

    Started by JoeyM‎, 05-12-2010 03:31 PM
    • Replies: 2
    • Views: 8,213
    05-13-2010, 04:36 PM Go to last post
  11. [Help] What is the statistical formula applied in this problem?

    Stat/Math wizs, if you could kindly shine your beacon on this problem. I'm running some statistics using a clustering algorithm and it classified...

    Started by psynpsyn‎, 05-13-2010 02:48 AM
    • Replies: 2
    • Views: 2,177
    05-14-2010, 11:15 PM Go to last post
  12. Model Suggestions?

    Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

    Started by Flatnose‎, 05-15-2010 06:25 AM
    • Replies: 2
    • Views: 2,502
    05-20-2010, 08:07 AM Go to last post
  13. How to calculate variance on pooled data

    I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

    Started by felixcollins‎, 05-17-2010 11:37 PM
    • Replies: 2
    • Views: 6,103
    05-30-2010, 09:49 PM Go to last post
  14. Grouping distributions together based on significance

    Hi, all: My PhD research has wandered into an area that requires more statistical analysis than I am currently comfortable with, and so I'm...

    Started by Adrian‎, 05-21-2010 11:19 AM
    • Replies: 2
    • Views: 2,100
    05-21-2010, 12:46 PM Go to last post
  15. try this for kicks...

    Hi everyone! First post for me. I think this might be a bit tricky, but i would really appreciate some help (go figure..). I recently got...

    Started by deadrabbit‎, 06-11-2010 07:16 AM
    • Replies: 2
    • Views: 2,006
    06-12-2010, 03:04 AM Go to last post
  16. P-value Formula for Z-test Statistic

    Hello All, I am trying to find the formula for p-value for a z-test. Ultimately, I would like to code this in PHP, but first need to start by...

    Started by rwd5013‎, 06-17-2010 01:50 PM
    • Replies: 2
    • Views: 14,990
    06-17-2010, 05:13 PM Go to last post
  17. Need Help in identifying problem

    Hello all, Imagine you have two time series X1,X2,...Xt - represents incoming volume to the yard, and Y1,Y2,...,Yt - outgoing volume from the...

    Started by Tart‎, 07-06-2010 01:51 PM
    • Replies: 2
    • Views: 2,993
    07-06-2010, 08:36 PM Go to last post
  18. Question Sample size calculation formulae

    Sample size calculation formulae Can someone please let me know where I can find a suitable 'Sample Size calculation Formula'? A standard...

    Started by sachitha‎, 08-21-2010 11:07 AM
    • Replies: 2
    • Views: 3,721
    08-21-2010, 11:38 AM Go to last post
  19. How to correct negative skew

    My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

    Started by elf212‎, 07-21-2010 08:20 PM
    • Replies: 2
    • Views: 8,152
    07-23-2010, 05:03 PM Go to last post
  20. Strange likelihood function

    I have seen multiple instances where a strange negative log-likelihood function is used either to describe the posterior distribution of a model fit...

    Started by ErinFish‎, 07-28-2010 01:03 PM
    • Replies: 2
    • Views: 3,489
    08-04-2010, 01:34 PM Go to last post
  21. error on percentile estimation

    Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

    Started by Jack Carter‎, 08-17-2010 03:54 AM
    • Replies: 2
    • Views: 6,551
    08-17-2010, 06:01 AM Go to last post
  22. data transformation software

    Does anyone know of any software that will transform data to normality for me? specifically first one: lognormal second one:burr(4p) third one:...

    Started by yoma819‎, 08-17-2010 11:49 AM
    • Replies: 2
    • Views: 3,090
    08-17-2010, 01:08 PM Go to last post
  23. Negative binomial regression / poisson regression

    Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

    Started by paul de boer‎, 08-27-2010 09:56 AM
    • Replies: 2
    • Views: 8,840
    08-28-2010, 04:24 AM Go to last post
  24. Comparison of time series

    Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

    Started by nofuj‎, 09-13-2010 01:35 AM
    • Replies: 2
    • Views: 9,363
    09-17-2010, 11:58 AM Go to last post
  25. Numeric algorithm to compute probability for Beta Binomial

    Dear all, I am trying to find a numeric method that can be handled at least by Excel to compute the probabilities of Beta Binomial distribution....

    Started by LLICZ‎, 09-24-2010 01:04 PM
    • Replies: 2
    • Views: 6,670
    09-26-2010, 03:48 PM Go to last post
  26. Arrow My professor told me that a t-test wasn't the correct procedure to use in a report

    In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

    Started by jenclark242‎, 10-01-2010 03:13 PM
    • Replies: 2
    • Views: 2,692
    10-02-2010, 01:34 PM Go to last post
  27. Question Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

    Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

    Started by sachitha‎, 10-04-2010 11:40 AM
    • Replies: 2
    • Views: 14,792
    10-04-2010, 06:41 PM Go to last post
  28. Normal Extreme Values

    Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

    Started by ichbin‎, 10-15-2010 05:49 PM
    • Replies: 2
    • Views: 2,849
    10-17-2010, 11:19 PM Go to last post
  29. IQR and Standard Deviation

    Hello everyone, I'm trying to determine if there is a relationship that exists between IQR and Standard Deviation in all distributions, not just...

    Started by jgills‎, 10-20-2010 06:22 AM
    • Replies: 2
    • Views: 3,553
    10-20-2010, 04:28 PM Go to last post
  30. Help with choice of nonparametric?

    Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

    Started by Confused_Claire‎, 11-06-2010 08:33 AM
    • Replies: 2
    • Views: 2,518
    11-07-2010, 02:57 AM Go to last post
  31. Can you combine survey responses for a Confidence Interval

    Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

    Started by lincoln5‎, 11-06-2010 01:31 PM
    • Replies: 2
    • Views: 2,550
    11-10-2010, 11:04 AM Go to last post
  32. Need help with large data set. Nested/factorial??

    I'm working with my field data and trying to understand the best way to analyze it. I have: 6 Sites 2 tide-pools per site Each pool has at...

    Started by aesopclimber‎, 11-08-2010 04:06 AM
    • Replies: 2
    • Views: 2,575
    11-08-2010, 07:51 PM Go to last post
  33. ranking and meta-analysis

    Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

    Started by Leosw1981‎, 11-10-2010 11:39 AM
    • Replies: 2
    • Views: 5,736
    11-11-2010, 03:02 AM Go to last post
  34. Paired Data

    Hi All, I have some paired data (pre and post test on the same subjects) I did a paired t-test to test the means. Now I want to look at...

    Started by Martingale‎, 11-12-2010 11:44 PM
    • Replies: 2
    • Views: 2,794
    11-14-2010, 08:58 PM Go to last post
  35. Op notation

    Hey Guys. It is my first time here. Glad to meet you all. I've got a question on Op notation. In my research, I've got an assumption associated...

    Started by hslinhc‎, 11-13-2010 03:59 AM
    • Replies: 2
    • Views: 2,901
    12-04-2010, 05:18 PM Go to last post
  36. Determining Clustering in Time Series Data

    Dear all, Let me begin by apologising if my question is obvious or rudimentary, I have a very basic knowledge of statistics. I have some time...

    Started by Rss‎, 11-19-2010 07:50 AM
    • Replies: 2
    • Views: 4,112
    11-20-2010, 07:14 PM Go to last post
  37. 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: 5,185
    12-23-2010, 08:31 PM Go to last post
  38. Transforming a variable to be normally distributed

    Hey guys, I was having trouble and figured that maybe one of the vet's here could help. I'm setting up a linear regression model for this class...

    Started by Link‎, 11-22-2010 03:05 PM
    • Replies: 2
    • Views: 3,378
    11-22-2010, 03:32 PM Go to last post
  39. how to calculate Factor Scores?

    Hello folks, I need to know how to calculate factor score in Principal Component Analysis. I know in SPSS, it gives option of calculating it using...

    Started by zara‎, 11-23-2010 12:15 AM
    • Replies: 2
    • Views: 11,790
    11-23-2010, 12:28 PM Go to last post
  40. Unhappy How do we compare medians?

    Hi, I have a project whereI have to compare short term and long term medians of a given data over four not consecetive years, like 1999, 2007,...

    Started by SadieKhan‎, 11-26-2010 07:14 AM
    • Replies: 2
    • Views: 7,147
    12-04-2010, 04:43 AM Go to last post
  41. resampling CI

    Hi there, I have a question regarding the bootstrap. Suppose you want to run a simulation about estimating an unknown parameter θ. Suppose...

    Started by leo nidas‎, 11-28-2010 01:45 PM
    • Replies: 2
    • Views: 3,296
    11-28-2010, 03:00 PM Go to last post
  42. HLM vs. Fixed Factor vs. Dummy Variables -- What to choose?

    Hi all, I am trying to analyze data from a survey that I ran, which includes individual residents within 4 neighborhoods. I want to be able to...

    Started by moneypenny02‎, 12-07-2010 04:15 PM
    • Replies: 2
    • Views: 4,160
    12-08-2010, 11:57 AM Go to last post
  43. Is online survey random? How to make it random?

    Hi there, I want to conduct an online survey. I know that by default only some users would be included. How to increase randomness? Thank you.

    Started by Sylviastat‎, 12-22-2010 02:15 AM
    • Replies: 2
    • Views: 4,790
    12-25-2010, 06:14 AM Go to last post
  44. appropriate test for comparing rank order of countries

    I have a dataset where countries are ranked based on how often they are chosen by firms in different time periods i.e. 1966-80, 1981-95, 1996-2010. I...

    Started by tstats‎, 01-01-2011 08:22 PM
    • Replies: 2
    • Views: 5,605
    01-02-2011, 05:57 AM Go to last post
  45. Grou x Time interactions

    Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

    Started by pcastro‎, 01-09-2011 08:29 PM
    • Replies: 2
    • Views: 11,848
    01-10-2011, 05:26 AM Go to last post
  46. 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: 5,179
    01-06-2011, 01:12 PM Go to last post
  47. Which Anova to use???

    Okay. So I've read tons of books on this and none of them seem to give me a clear answer so here goes. I have 40 subjects. Each will be randomly...

    Started by kyle_genner‎, 01-15-2011 01:20 PM
    • Replies: 2
    • Views: 4,571
    01-31-2011, 03:01 AM Go to last post
  48. Ranked data

    I asked my participants to rank 5 items as 1=least severe to 5 =most severe, now how can I analyse these data, parametric or non-parametric tests,...

    Started by edju‎, 01-15-2011 07:03 PM
    • Replies: 2
    • Views: 3,366
    01-16-2011, 02:10 PM Go to last post
  49. interaction

    I have found a model to be significant for the effect of 4 IVs (two continuous and two dichotomous) on a continuous DV but none of the IVs show...

    Started by Deirdre‎, 01-18-2011 09:13 AM
    • Replies: 2
    • Views: 2,891
    02-07-2011, 10:17 PM Go to last post
  50. Mann-Whitney U Test for non random sample

    Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

    Started by arobbo‎, 01-19-2011 01:10 PM
    • Replies: 2
    • Views: 3,415
    01-20-2011, 03:31 AM Go to last post
  51. What is the proper way to divide a skewed dataset into high, medium, and low interval

    I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

    Started by clazu‎, 01-23-2011 01:23 AM
    • Replies: 2
    • Views: 6,847
    01-24-2011, 11:37 AM Go to last post
  52. linear mixed model in SPSS - how?

    Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

    Started by BBD‎, 02-02-2011 11:58 AM
    • Replies: 2
    • Views: 18,825
    02-25-2011, 02:56 PM Go to last post
  53. Sum of the residuals

    Hi, My question may sound trivial but here it goes: When doing a sample regression by the ordinary least squares method, does the sum (nonsquared!...

    Started by val92‎, 02-04-2011 12:49 PM
    • Replies: 2
    • Views: 50,694
    02-04-2011, 01:40 PM Go to last post
  54. Likelihood Ratio Test for general hypotheses

    Hi, The original paper (Wilks, 1938) describing the Likelihood Ratio Test considers a null hypothesis stating that a subset of the parameters from...

    Started by dfirka‎, 02-14-2011 01:29 PM
    likelihood ratio test
    • Replies: 2
    • Views: 5,946
    02-17-2011, 07:54 AM Go to last post
  55. Question MLE for given mean

    The observed value of mean of a random sample from N(\theta,1) distribution is 2.3. If the parameter space is \Theta=\{0,1,2,3\}, what is the MLE of...

    Started by Sambit‎, 02-21-2011 10:09 AM
    • Replies: 2
    • Views: 2,227
    02-21-2011, 10:59 AM Go to last post
  56. Fisher LDA

    Hi, How do I incorporate knowledge of prior class probabilities p_i into Fisher LDA? I think Fisher LDA assumes p_i = 1/c always, with c=# of...

    Started by omrit‎, 02-22-2011 08:54 AM
    • Replies: 2
    • Views: 4,154
    02-22-2011, 11:39 AM Go to last post
  57. Best Approach

    Hi, I am looking to analyse a data set consisting of one dependent variable - respondent satisfaction values ranging from 1 to 10 - with three...

    Started by cockett7‎, 02-22-2011 06:42 PM
    • Replies: 2
    • Views: 2,449
    02-23-2011, 11:38 AM Go to last post
  58. Correlation or Difference?

    hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

    Started by micdhack‎, 02-26-2011 08:03 AM
    • Replies: 2
    • Views: 5,630
    02-26-2011, 11:41 AM Go to last post
  59. Significance testing for proportions (NPS)

    I have 2009 and 2010 NPS (Net Promoter Score) survey results. Now I want to test if the change in 2010 NPS from 2009 is statistically significant or...

    Started by Kevin_ind‎, 03-01-2011 02:26 AM
    • Replies: 2
    • Views: 7,755
    03-07-2011, 05:17 AM Go to last post
  60. Common method variance

    Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

    Started by john_cappa‎, 03-01-2011 10:43 AM
    • Replies: 2
    • Views: 3,830
    03-03-2011, 08:52 PM Go to last post

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