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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: 18,755
    10-11-2014, 12:02 PM Go to last post
  1. GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

    Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

    Started by Alicia2010‎, 05-20-2010 03:59 AM
    • Replies: 0
    • Views: 4,179
    05-20-2010, 03:59 AM Go to last post
  2. 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
  3. 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
  4. pearsons versus spearmans

    Hi I have a very common but somehow still confusing question regarding correct correlation to use when addressing the relationship between two...

    Started by RuthH‎, 05-02-2010 08:37 AM
    • Replies: 1
    • Views: 2,643
    05-23-2010, 10:28 AM Go to last post
  5. gee longitudinal

    Hi there, I goin crazy with GEE and longitudianl data. I've studied the algorithm in many books and I am sure that I understand it and try to...

    Started by leo nidas‎, 05-23-2010 05:01 PM
    • Replies: 0
    • Views: 2,043
    05-23-2010, 05:01 PM Go to last post
  6. predictive analysis algorithm

    Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

    Started by fajo‎, 05-25-2010 07:57 AM
    • Replies: 0
    • Views: 2,505
    05-25-2010, 07:57 AM Go to last post
  7. Market research questionnaire re-design

    Hi, I have a questionnaire which contains 91 questions, I need to take away roughly 10-20 of them due to cost reason. I was thinking to use Factor...

    Started by Tiffy‎, 05-27-2010 05:53 AM
    • Replies: 3
    • Views: 2,690
    05-28-2010, 08:10 AM Go to last post
  8. 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: 6,102
    05-30-2010, 09:49 PM Go to last post
  9. Smile Sample

    Consider we have a random sample (120 answers) and a convenience sample (80 answers) from the same population. Since the means of both samples are...

    Started by Marte‎, 05-30-2010 01:37 PM
    • Replies: 3
    • Views: 2,503
    05-31-2010, 08:03 AM Go to last post
  10. Cool multinomial score

    I am struggling with getting a result from McCullagh & Nelder 1989 GLM on p. 171 they show the derivative of the likelihood to be what is shown...

    Started by stephenb‎, 05-31-2010 10:42 AM
    • Replies: 0
    • Views: 2,194
    05-31-2010, 10:42 AM Go to last post
  11. Question Probability Density Function needed

    I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

    Started by pandre‎, 05-25-2010 04:51 AM
    • Replies: 1
    • Views: 3,161
    06-01-2010, 09:10 AM Go to last post
  12. sufficient statistic

    Hi guys, I have a little question. I got a density function: f(x)=exp{-(x-\theta)} when \theta<X<infinity I need to find a sufficient...

    Started by WeeG‎, 06-02-2010 11:51 AM
    • Replies: 1
    • Views: 4,009
    06-02-2010, 11:59 AM Go to last post
  13. Checking conditional and mutual independence

    Hi, I am working on bayesian networks and i am encountering problem in calculation of conditional and mutual independence. My problem is I have...

    Started by Aseem‎, 06-04-2010 05:58 AM
    • Replies: 0
    • Views: 1,998
    06-04-2010, 05:58 AM Go to last post
  14. Regression Model

    wefwefwfweff

    Started by fhaquassho‎, 06-03-2010 06:07 PM
    • Replies: 3
    • Views: 3,919
    06-04-2010, 09:04 AM Go to last post
  15. best way to use Cronbach's alpha?

    I am making my first foray into survey based research. A quick question or two about Cronbach's alpha: My survey included questions about...

    Started by student's t top‎, 06-07-2010 02:22 PM
    • Replies: 1
    • Views: 6,728
    06-07-2010, 03:55 PM Go to last post
  16. dependent cases in logsitic regression, any recourse?

    I'm hoping to use logistic regression to analyze a 2x3 repeated-measures factorial design. The IVs are both categorical. The DV is dichotomous...

    Started by reductico‎, 06-08-2010 01:52 PM
    • Replies: 0
    • Views: 2,207
    06-08-2010, 01:52 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: 5,340
    06-09-2010, 02:09 PM Go to last post
  18. Repeated measures ancova

    Hi I am very stuck does anyone know how to run a repeated measures ancova in spss please!!!!

    Started by Rich D‎, 06-09-2010 02:45 PM
    • Replies: 1
    • Views: 4,687
    06-09-2010, 05:19 PM Go to last post
  19. Mle

    Hi guys, I need advice regarding this question: The height of students at university is a random variable from the N(\mu,25) distribution. A...

    Started by WeeG‎, 06-08-2010 06:21 AM
    • Replies: 11
    • Views: 3,299
    06-10-2010, 01:17 PM Go to last post
  20. 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
  21. Introduction for Observational Study on Red Cars

    This is the Introduction for my stats project on red cars vs. speeding tickets received. Let me know what changes to make, and how the intro is....

    Started by Thanasi‎, 06-13-2010 09:01 AM
    • Replies: 0
    • Views: 3,541
    06-13-2010, 09:01 AM Go to last post
  22. 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
  23. How have you dealt with missing values?

    I'm currently conducting a large content analysis on company disclosures and have a lot of missing values. I've been looking at different ways to try...

    Started by Freaked_out‎, 06-21-2010 11:54 PM
    • Replies: 0
    • Views: 3,021
    06-21-2010, 11:54 PM Go to last post
  24. Youden Index

    Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

    Started by sbruce44‎, 06-23-2010 02:51 PM
    • Replies: 0
    • Views: 6,191
    06-23-2010, 02:51 PM Go to last post
  25. Significant Difference with 2 vars

    Hi everyone, Is it at all possible to determine if a group of points on a scatterplot are significantly different from another group of points? ...

    Started by harryema‎, 06-24-2010 07:04 PM
    • Replies: 7
    • Views: 3,789
    06-25-2010, 11:03 AM Go to last post
  26. rxc contingency table: comparison between cells?

    Hello.I'm a dental student. I'm studying about how restorative methods are going to affect fracture pattern(fra.(fp)) of teeth. As a result I have a...

    Started by batosan‎, 06-24-2010 06:58 AM
    • Replies: 7
    • Views: 5,742
    06-26-2010, 04:52 AM Go to last post
  27. Question NLP Algorithm Evaluation: Help?

    Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

    Started by gvadalkivir‎, 06-28-2010 03:01 PM
    • Replies: 0
    • Views: 2,916
    06-28-2010, 03:01 PM Go to last post
  28. statistics calculator to adjust for design effect

    Hi there, I'd like to know if anyone could tell me of a stats calculator that can adjust means and confidence intervals of analyses (paired-t and...

    Started by psychomania85‎, 06-29-2010 03:48 AM
    • Replies: 1
    • Views: 4,993
    07-01-2010, 02:41 PM Go to last post
  29. compute true values monte carlo simulation

    Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

    Started by alex76‎, 06-10-2010 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,742
    07-04-2010, 05:19 AM Go to last post
  30. 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
  31. How to predict prevalence rate based on demographic factors?

    Some background: I've been teaching myself some math and statistics - started developing software as a kid and went right into the field after...

    Started by kgmiller‎, 07-06-2010 01:14 AM
    • Replies: 4
    • Views: 4,212
    07-06-2010, 09:40 PM Go to last post
  32. Latin Hypercube sampling with correlations

    Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

    Started by Vlob‎, 07-07-2010 02:57 AM
    • Replies: 0
    • Views: 3,253
    07-07-2010, 02:57 AM Go to last post
  33. Log likelihood function for P-EGARCH(1,1)-t needed

    Hi guys, I am currently writing my MSc. Finance thesis on calendar effects, using a Periodic Exponential GARCH(1,1) model with student-t error...

    Started by ROSSINL‎, 07-11-2010 11:30 PM
    • Replies: 0
    • Views: 4,124
    07-11-2010, 11:30 PM Go to last post
  34. Ranking advertisers based on performance

    Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

    Started by FlashStats‎, 07-10-2010 10:22 AM
    • Replies: 3
    • Views: 2,904
    07-13-2010, 02:23 PM Go to last post
  35. Intraclass correlation coefficients for linear mixed models

    I've been looking around for a while and have yet to find and answer to satisfy my appetite. Hopefully, one of the members here will be able to help....

    Started by Link‎, 07-13-2010 02:51 PM
    • Replies: 0
    • Views: 3,975
    07-13-2010, 02:51 PM Go to last post
  36. Extreme events...

    Hi. Is {w:P(w) is very small} acceptable to translate the meaning of extreme events given in the following sentence: An extreme event is defined as...

    Started by tsukiko‎, 07-14-2010 07:41 AM
    • Replies: 6
    • Views: 4,639
    07-14-2010, 07:47 PM Go to last post
  37. 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: 5,335
    07-16-2010, 10:29 AM Go to last post
  38. variables that are not independent of each other

    What are some ways this dependency is modeled with statistical methods?

    Started by Outlier‎, 07-16-2010 03:12 PM
    • Replies: 5
    • Views: 3,890
    07-16-2010, 05:03 PM Go to last post
  39. Multicointegration - alternative variable?

    Time series: For example, if a dependent variable only have 17 observations could I replace it with something with more data if I want a rough...

    Started by tomandjerry714‎, 07-19-2010 07:31 PM
    • Replies: 0
    • Views: 6,960
    07-19-2010, 07:31 PM Go to last post
  40. 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
  41. t test using diversity index

    So, I am trying to perform a t-test using diversity indexes, but the biostat book I am using is a little bit confusing. the calculated t value =...

    Started by agarcin‎, 07-23-2010 08:49 PM
    • Replies: 0
    • Views: 3,409
    07-23-2010, 08:49 PM Go to last post
  42. Question about Stationary R^2 and Ljung-Box Statistics in ARIMA Models...

    On the results of my ARIMA models in SPSS, I am getting Ljung-Box statistics that are statistically significant (P < 0.05) but also horrible R^2...

    Started by stormmedic85‎, 07-25-2010 07:44 PM
    • Replies: 0
    • Views: 4,286
    07-25-2010, 07:44 PM Go to last post
  43. Nonparametric assumptions

    Hi, I've come across a paper in the environmental science literature that suggests that the assumption of independence (and additivity) needed in...

    Started by suobs‎, 07-24-2010 11:25 AM
    • Replies: 9
    • Views: 6,733
    07-29-2010, 11:17 AM Go to last post
  44. Question What is the accepted Confidence Interval for a Business research..

    Hi all, I need to know the accepted Confidence Level (e.g. whether it is 95% or 99%) and the accepted "Confidence Interval" (e.g. if it is 10 or...

    Started by sachitha‎, 07-24-2010 11:33 PM
    • Replies: 4
    • Views: 8,929
    07-31-2010, 11:15 AM Go to last post
  45. levy process, subordinator

    Hi, I start to come across papers talking about levy process and subordinator. Any suggestion for textbook about this topic? Thank you

    Started by pipehappy‎, 08-02-2010 12:53 PM
    • Replies: 0
    • Views: 4,054
    08-02-2010, 12:53 PM Go to last post
  46. "significance metrics" for hypothesis testing

    ------------

    Started by p05‎, 08-02-2010 04:58 PM
    • Replies: 0
    • Views: 2,626
    08-02-2010, 04:58 PM Go to last post
  47. 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: 5,479
    08-03-2010, 01:01 PM Go to last post
  48. 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
  49. Sampling question

    I have to estimate 2 parameters from a health claims database: the total dollars paid correctly and the proportion of claims adjudicated correctly. ...

    Started by mrc112‎, 08-05-2010 10:55 AM
    • Replies: 0
    • Views: 2,025
    08-05-2010, 10:55 AM Go to last post
  50. How to describe data that trends to a horizontal aymptote?

    Hi all, I'm designing a within-subject experiment with one independent variable X, where we are expecting the dependent variable to increase...

    Started by metric‎, 08-05-2010 01:13 PM
    • Replies: 0
    • Views: 3,010
    08-05-2010, 01:13 PM Go to last post
  51. difference between mean ranks

    Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

    Started by m777k‎, 08-06-2010 07:34 AM
    • Replies: 1
    • Views: 5,624
    08-06-2010, 08:25 AM Go to last post
  52. Does anyone know what associated means??

    I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

    Started by wwreith‎, 08-06-2010 09:14 AM
    • Replies: 1
    • Views: 3,022
    08-06-2010, 10:55 AM Go to last post
  53. post-hocs for repeated measures ancova

    hi there, i am running a 2x2x3 repeated measures anova with a covariate i have an interaction between two within-subjects variables, and...

    Started by purplestar‎, 08-10-2010 07:59 AM
    • Replies: 0
    • Views: 4,182
    08-10-2010, 07:59 AM Go to last post
  54. paired anova for lack of a better word advice please

    Dear All i am stuck at the moment between a rock and a hard place. the short of the story is this. I have 84 petri dishes each containing 4 lines...

    Started by yoma819‎, 08-08-2010 05:58 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,174
    08-14-2010, 08:41 AM Go to last post
  55. 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: 5,117
    08-14-2010, 09:36 AM Go to last post
  56. muscle strength gain vs. time vs. age

    Anyone have data from longitudinal studies on this? 1% per week seems like a reasonable initial value. Thanks.

    Started by Outlier‎, 08-15-2010 04:24 PM
    • Replies: 0
    • Views: 3,419
    08-15-2010, 04:24 PM Go to last post
  57. data transformation links please

    Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

    Started by yoma819‎, 08-15-2010 04:25 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,673
    08-16-2010, 11:59 AM Go to last post
  58. 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
  59. 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
  60. minimum data points for the K-s test for normality

    Dear all I have 6 points of data that i need to test for normality. is this enough to use the K-s test? what is the advised minimum for this test?...

    Started by yoma819‎, 08-18-2010 04:45 PM
    • Replies: 0
    • Views: 4,577
    08-18-2010, 04:45 PM Go to last post

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