1. Announcement:
    Want access to a chatbox?
    Dason ‎(Devorador de queso)
    05-10-2017
    Views:
    1,848
+ Post New Thread
Page 1 of 54 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 ... LastLast
Threads 1 to 60 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: 18,689
    10-11-2014, 12:02 PM Go to last post
  1. Variance estimation

    A simple question we have a random sample n=2 with X, Y drawn from a normal distribution N~(0, \sigma^2). Is V=\frac{X^2}{2}+\frac{Y^2}{2} a...

    Started by _joey‎, 10-31-2010 05:09 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,451
    11-01-2010, 06:42 AM Go to last post
  2. Linear estimator of mean

    Problem is solved! :)

    Started by _joey‎, 11-03-2010 05:19 AM
    • Replies: 0
    • Views: 1,849
    11-03-2010, 05:19 AM Go to last post
  3. Project ideas

    Hello guys and girls, In our coursework programme we will be asked to complete 2 industry projects each 25-30 pages long. There is a great number...

    Started by _joey‎, 11-28-2010 06:07 AM
    • Replies: 0
    • Views: 4,617
    11-28-2010, 06:07 AM Go to last post
  4. Algebra, two-sample t-statistic, variance

    Could someone help to start with the question. Question: http://s12.postimage.org/kvtyiacuj/question.png Thanks!

    Started by _joey‎, 08-06-2012 02:24 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,765
    08-13-2012, 12:31 AM Go to last post
  5. 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: 5,093
    01-11-2011, 08:28 AM Go to last post
  6. bridge estimation in linear regression

    So the bridge estimates, \beta (which is a vector of \beta_1,...,\beta_p), minimize \sum_{i=1}^n (y_i - x_i^T\beta)^2 +...

    Started by zzzc‎, 11-25-2010 11:53 PM
    • Replies: 0
    • Views: 2,327
    11-25-2010, 11:53 PM Go to last post
  7. number of distinct samples in sampling with replacement

    If I have a set (X1, X2,X3) and I want to re-sample them with replacement, the possible combinations of the samples are (the order doesn't matter):...

    Started by zzzc‎, 02-01-2011 06:58 PM
    • Replies: 0
    • Views: 3,602
    02-01-2011, 06:58 PM Go to last post
  8. interval censored data using bootstrap method

    I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

    Started by zzzc‎, 03-16-2011 08:35 PM
    • Replies: 2
    • Views: 4,835
    03-29-2011, 09:09 PM Go to last post
  9. nonparametric estimate the distribution with a histogram only

    Suppose X1,.., Xn ~iid F with mean mu_F The data is summarized in a histogram and that is all I have. I don't have the individual Xi (i = 1,...,n)....

    Started by zzzc‎, 03-23-2011 11:32 PM
    • Replies: 3
    • Views: 3,072
    03-24-2011, 11:47 PM Go to last post
  10. bias of the coefficient of variation

    Is the coefficient of variation biased? How would you compute the bias of CV? Can I write E(sigma_hat/|mu_hat|) = E(sigma_hat)E(1/|mu_hat|)+ ...

    Started by zzzc‎, 03-30-2011 10:50 AM
    • Replies: 4
    • Views: 5,666
    03-30-2011, 02:38 PM Go to last post
  11. EM Algorithm for Gaussian Mixture model fitting data with missing values

    I have an EM function that will take regular data with no missing values, and compute means, standard deviations, and probabilities of components of...

    Started by zzzc‎, 03-31-2011 09:15 PM
    • Replies: 1
    • Views: 4,369
    04-12-2011, 11:26 AM Go to last post
  12. about random walk Metropolis algorithm

    Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

    Started by zzeta35‎, 01-06-2013 04:45 PM
    r code, rwm
    • Replies: 3
    • Views: 2,187
    01-06-2013, 07:50 PM Go to last post
  13. Which Tests?

    Hello! I am considering a study I'll note below, but have limited statistical experience. Accordingly I am seeking insights on which tests are...

    Started by zzehr‎, 08-02-2014 10:54 PM
    • Replies: 2
    • Views: 2,254
    08-03-2014, 10:56 PM Go to last post
  14. might be a stupid question...

    I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

    Started by zxcvbnm‎, 03-15-2009 01:18 PM
    • Replies: 2
    • Views: 3,724
    03-16-2009, 11:07 AM Go to last post
  15. t-tests or mann-whitney??

    Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

    Started by zxcvbnm‎, 03-28-2009 02:16 PM
    • Replies: 2
    • Views: 8,537
    05-03-2009, 06:41 PM Go to last post
  16. Looking for appropriate non-parametric test for 5 dependent group & small sample size

    What is the most appropriate parametric test for repeated observations for multiple dependent groups.

    Started by Zwsean‎, 01-28-2017 01:08 PM
    dependent groups, nonparametric, small sample, test
    • Replies: 1
    • Views: 2,225
    01-29-2017, 12:56 AM Go to last post
  17. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 4,157
    03-03-2017, 01:48 PM Go to last post
  18. 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: 1,867
    03-11-2015, 01:18 PM Go to last post
  19. Survey Analysis

    Hey Guy's I really need your help. I am not a statistician. I have to analyze surveys that have 6 observations (people) and 20 factors (food...

    Started by zqkal‎, 01-19-2012 03:07 PM
    data analysis, statistical research, survey analysis
    • Replies: 8
    • Views: 2,261
    01-30-2012, 12:20 PM Go to last post
  20. Confidence interval and P-value

    Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

    Started by zqkal‎, 02-06-2012 02:32 PM
    • Replies: 3
    • Views: 2,312
    02-08-2012, 11:48 AM Go to last post
  21. MDS with confusion matrix

    Hi, I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I need to transform it to a...

    Started by zozo‎, 06-23-2009 07:12 PM
    • Replies: 0
    • Views: 2,800
    06-23-2009, 07:12 PM Go to last post
  22. Kruskal-Wallis or Poisson regression for parasite count data?

    Trying to figure out how best to carry out this analysis... So essentially I have four different species of Deer mice, infected with a high, medium,...

    Started by zoonotic‎, 10-27-2015 10:12 AM
    count data, kruskal-wallis, parasitology, poisson regression
    • Replies: 4
    • Views: 1,514
    10-27-2015, 05:28 PM Go to last post
  23. Sampling Method? Too many schools to sample

    I am part of a research team looking at the outcomes of a homework help program and would like to make a few suggestions of how to generate data. ...

    Started by Zooi‎, 04-24-2009 11:07 AM
    • Replies: 0
    • Views: 2,186
    04-24-2009, 11:07 AM Go to last post
  24. Which basic stat test to use?

    I have done a lot of linear modeling for my thesis, however one of the unsolved stat problems I have should be a pretty basic issue. I am testing to...

    Started by zombie_kid‎, 03-31-2014 09:03 PM
    • Replies: 1
    • Views: 1,213
    04-01-2014, 04:17 AM Go to last post
  25. May anyone please tell me what does this output express?

    image hosting 5mb

    Started by Zolitoo‎, 09-01-2015 06:08 PM
    • Replies: 0
    • Views: 1,147
    09-01-2015, 06:08 PM Go to last post
  26. Missing values with Row and Column Totals

    Hello everyone, I'm working with government panel data (yearly data of manufacturing industry (row) by continent (column)) that has a lot (about...

    Started by zlatank‎, 03-23-2011 12:41 PM
    algorithm, data, imputation, missing values, sudoku
    • Replies: 0
    • Views: 1,912
    03-23-2011, 12:41 PM Go to last post
  27. What should i do next?

    Hi all, I want to see the effect of gender changes depending on the race of student when they have drunk driving behaviors. There is an...

    Started by zjww58‎, 10-26-2013 10:13 PM
    • Replies: 0
    • Views: 1,064
    10-26-2013, 10:13 PM Go to last post
  28. Question about sample size and margin of error

    I am trying to determine if my dataset sample size is large enough to be statistically significant. I'm using a 95% confidence interval. However,...

    Started by zizekkeynes‎, 12-05-2013 01:37 PM
    power, sample size
    • Replies: 3
    • Views: 1,391
    12-06-2013, 02:46 AM Go to last post
  29. Bayesian approach to comparing parameters of two distributions

    This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

    Started by zipp83‎, 05-09-2012 02:27 AM
    • Replies: 4
    • Views: 2,977
    05-09-2012, 02:20 PM Go to last post
  30. survey weighting and calculation of confidence intervals for proportions

    Hi all I'm working with data from a one-off cross-sectional random sample survey that has weighting that can be applied to make it representative...

    Started by zingbar‎, 08-07-2012 04:20 PM
    • Replies: 0
    • Views: 3,738
    08-07-2012, 04:20 PM Go to last post
  31. Comparing Mean and Median

    Hello people. I'm currently doing a research on household income and expenditure in my country, and I'm faced with some problems: 1. Are mean and...

    Started by ZimZim‎, 08-24-2013 08:02 AM
    • Replies: 2
    • Views: 2,190
    08-24-2013, 05:52 PM Go to last post
  32. How do I calculate the Sample Size for this type of Survey?

    Hi all, I need to calculate the sample size for a survey I will be undertaking soon. The target population will be the clients of 8 hotels,...

    Started by zicitron‎, 03-15-2013 11:53 PM
    sample size, sample size calculation, surveys, target population
    • Replies: 0
    • Views: 1,009
    03-15-2013, 11:53 PM Go to last post
  33. markov chains- estimation

    Hello all, my task is to estimate parametres of markov chain model basing on real economic data. Does anyone have any idea what sort of data would...

    Started by zhukov‎, 01-11-2008 05:23 PM
    • Replies: 1
    • Views: 2,639
    01-12-2008, 10:19 AM Go to last post
  34. T-test appropriate?

    Hello all, I have a big dataset which I divided into different periods (years) and focused on one group. I calculated the means for the different...

    Started by zerostin‎, 04-26-2011 11:35 AM
    • Replies: 3
    • Views: 2,426
    04-28-2011, 06:33 AM Go to last post
  35. sample and gander

    Hi all, I have a newbie question I'm doing a small research about the prevalence of smoking in diabetic patient. My sample size is 300. However,...

    Started by zendar‎, 10-02-2013 12:54 AM
    • Replies: 0
    • Views: 1,697
    10-02-2013, 12:54 AM Go to last post
  36. Converting 1 Distribution to Another

    I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

    Started by zeloc‎, 03-06-2010 12:51 PM
    • Replies: 5
    • Views: 4,506
    03-26-2010, 12:50 PM Go to last post
  37. SOS action research project question

    Firstly, I am grateful for any assistance. I am a novice who tries hard :yup: I am trying to write up the results section for a report and have...

    Started by zcl‎, 12-28-2016 11:47 PM
    • Replies: 1
    • Views: 3,186
    12-29-2016, 08:48 AM Go to last post
  38. Statistical Theories, Methods, and Fields applying to Educational Assessment

    I'm interested in doing research in education and statistic. Particulary with student assessment and students. However, I know this is very broad and...

    Started by zaylia‎, 08-17-2012 12:52 PM
    • Replies: 4
    • Views: 1,923
    08-17-2012, 04:04 PM Go to last post
  39. Type of Stats

    I am new at this - I have to design - on paper - a test to teach reading. I want to do a Pre-Test and Post-Test - compare the differences. I also...

    Started by Zardoz‎, 12-17-2013 04:46 PM
    • Replies: 1
    • Views: 1,866
    12-17-2013, 05:37 PM Go to last post
  40. Paired t- test experiment

    Hello, I have a sample 20 super market stores of a specific chain (who has in total 100 super market stores). In 1st of July there was an increase...

    Started by zarasandreas‎, 05-14-2011 05:34 AM
    • Replies: 0
    • Views: 2,920
    05-14-2011, 05:34 AM Go to last post
  41. Question about theta range in MA(1) processes

    Hello, According to forecasting textbooks (e.g. Diebold, Makridakis etc) the theta coefficient in an MA(1) model should be between -1 and 1...

    Started by zarasandreas‎, 09-08-2011 03:51 AM
    • Replies: 1
    • Views: 4,004
    09-08-2011, 08:45 AM Go to last post
  42. 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: 5,158
    09-08-2011, 02:08 PM Go to last post
  43. Standard Errors of Exponential Smoothing Coefficients

    Hello, I use SAS ETS to estimate a single exponential smoohting model. When i select the optimize option for the estimation of the smoothing...

    Started by zarasandreas‎, 09-12-2011 03:25 AM
    • Replies: 0
    • Views: 2,060
    09-12-2011, 03:25 AM Go to last post
  44. Yule Walker - AR(1) - Covariance Forumla

    Hello, I have the AR(1) process: Yt=phi*Yt-1 + et According to text books we ,ultiply by Yt-k, so we have: Yt*Yt-k=phi*Yt-1*Yt-k+et*Yt-k and...

    Started by zarasandreas‎, 10-01-2011 06:23 AM
    • Replies: 1
    • Views: 4,255
    10-01-2011, 11:22 AM Go to last post
  45. Unobserver Component Models for Forecasting vs ARIMA and Expoential Smoothing

    Hello, I read in textbooks and in forecasting software manuals that Unobserverd Components Models have the flexibility and are as powerfull as...

    Started by zarasandreas‎, 10-15-2011 12:00 PM
    • Replies: 0
    • Views: 3,066
    10-15-2011, 12:00 PM Go to last post
  46. Strict and Weak Stationarity Tests

    Hello, As far as i know stationarity can be characterized as weak and strict. The most well known test for stationarity are Dickey Fuller,...

    Started by zarasandreas‎, 11-06-2011 06:18 AM
    • Replies: 2
    • Views: 4,968
    11-06-2011, 06:24 PM Go to last post
  47. Cointegration and Correlation

    Hello, Based on real data (e.g. spot and futures prices of an index) if two series are correlated in the long run (e.g. strong positive...

    Started by zarasandreas‎, 11-08-2011 07:02 AM
    • Replies: 0
    • Views: 2,062
    11-08-2011, 07:02 AM Go to last post
  48. 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: 5,159
    11-18-2011, 09:36 AM Go to last post
  49. Dickey Fuller Test

    I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

    Started by zarasandreas‎, 11-24-2011 12:54 PM
    dickey fuller, econometrics, stationarity
    • Replies: 1
    • Views: 3,128
    11-25-2011, 01:49 AM Go to last post
  50. Holt's Exponential Smoothing Vs Brown Double Exponential Smoothing

    Hello, According to books Brown Double Exponential Smoothing (one parameter=alpha) is a special case of Holt's Linear Exponential Smoothing (two...

    Started by zarasandreas‎, 01-10-2012 05:51 AM
    • Replies: 0
    • Views: 3,260
    01-10-2012, 05:51 AM Go to last post
  51. Decision Tree with Binary Target

    Hello, I have a dataset with a number of inouts and a binary target. I want to build a decision tree model. SAS states that the predictions can be...

    Started by zarasandreas‎, 09-24-2012 08:36 AM
    • Replies: 1
    • Views: 1,269
    09-24-2012, 09:56 AM Go to last post
  52. 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: 1,300
    10-22-2012, 04:28 AM Go to last post
  53. 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: 11,744
    11-23-2010, 12:28 PM Go to last post
  54. probability inequality

    Let X be a random variable such that |X|<=C (bounded). Let f be an even, non decreasing function over the positive values of x. Prove that: /f(C)...

    Started by Zanetti‎, 02-04-2010 04:29 AM
    • Replies: 4
    • Views: 2,601
    02-06-2010, 05:53 PM Go to last post
  55. Comparison quantity with mean values and measurement uncertainty

    Hi !! I need help in a problem. I measured a quantity Q from the area A of a peak (normally distributed) divide by two factors. The uncertainty...

    Started by zana‎, 08-30-2014 10:47 AM
    anova, measurement
    • Replies: 0
    • Views: 1,494
    08-30-2014, 10:47 AM Go to last post
  56. Need help analyzing data in SPSS

    Hello everybody :) We conducted a simple experiment, our hypothesis was that negative biometeorological forecast induces nocebo effect, especially...

    Started by Ywannah‎, 04-26-2013 09:28 AM
    • Replies: 14
    • Views: 2,519
    04-26-2013, 08:59 PM Go to last post
  57. Is MANOVA the correct way?

    Hi all, In my research, I have values for 7 (+ 1 for reference) devices that measured the (walking) steps at the same time (so that I would be...

    Started by Yugi_oh‎, 05-17-2014 05:25 AM
    • Replies: 0
    • Views: 1,252
    05-17-2014, 05:25 AM Go to last post
  58. How should I explain this results?

    The hypothesis is: the willing-to-pay is higher when people see print ad with testimonial. So there are four print ads 1. 1 cola ad with...

    Started by yue86231‎, 11-13-2015 07:57 AM
    • Replies: 4
    • Views: 1,584
    11-14-2015, 01:34 PM Go to last post
  59. How should I further analyse this result?

    I have following variables: -"adtype" (1 is print ad with testimonials, 2 is print ad without testimonials.) -"AT1" which is "ad attitude...

    Started by yue86231‎, 11-24-2015 09:45 AM
    • Replies: 4
    • Views: 2,050
    12-04-2015, 04:05 AM Go to last post
  60. How should I run an interaction test to find out the main effect of ad type?

    Hello everyone, I designed an experiment. There are two types of advertisement, type 1 and type 2. 50% of my participants looked at the type 1 and...

    Started by yue86231‎, 01-20-2016 11:05 AM
    • Replies: 1
    • Views: 1,112
    01-21-2016, 04:36 AM Go to last post

+ Post New Thread
Page 1 of 54 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 ... LastLast

Thread Display Options

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Order threads in...

Note: when sorting by date, 'descending order' will show the newest results first.

Icon Legend

Contains unread posts
Contains unread posts
Contains no unread posts
Contains no unread posts
More than 15 replies or 300 views
Hot thread with unread posts
More than 15 replies or 300 views
Hot thread with no unread posts
Closed Thread
Thread is closed
Thread Contains a Message Written By You
You have posted in this thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats