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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: 18,750
    10-11-2014, 12:02 PM Go to last post
  1. Linear estimator of mean

    Problem is solved! :)

    Started by _joey‎, 11-03-2010 05:19 AM
    • Replies: 0
    • Views: 1,861
    11-03-2010, 05:19 AM Go to last post
  2. Arrow transformation response and predictors

    How to find the proper transformation of the response or predictors ? Is it simply to identify from the diagmostic plot ? Usually I apply...

    Started by purple‎, 11-03-2010 01:48 PM
    • Replies: 1
    • Views: 3,581
    11-03-2010, 03:08 PM Go to last post
  3. 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: 5,213
    11-04-2010, 12:12 PM Go to last post
  4. Correlation help needed!

    Hello, I am having trouble crunching some data and was wondering if someone could please walk me through it. I believe the correct test to use is...

    Started by Jessie14‎, 11-03-2010 10:52 PM
    • Replies: 1
    • Views: 2,401
    11-04-2010, 04:26 PM Go to last post
  5. confidence interval GREGG estimator

    i have estimated different proportions based on a sample survey. The estimation is done with the GREGG estimator(because of problem with nonrespone)....

    Started by martinf‎, 11-05-2010 09:01 AM
    • Replies: 0
    • Views: 1,643
    11-05-2010, 09:01 AM Go to last post
  6. 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: 2,516
    11-07-2010, 02:57 AM Go to last post
  7. Question about ANOVA alternatives for non-normally distributed data

    I am trying to analyze data from an experiment where participants take two reading tests, to compare the effectiveness of two different dictionaries...

    Started by KanjiTester‎, 11-08-2010 08:58 AM
    • Replies: 0
    • Views: 5,697
    11-08-2010, 08:58 AM Go to last post
  8. 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
  9. Volume of confidence intervals for Multinomial distributions

    Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

    Started by cyb3r.dani‎, 11-09-2010 09:50 AM
    • Replies: 0
    • Views: 3,381
    11-09-2010, 09:50 AM Go to last post
  10. 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: 2,548
    11-10-2010, 11:04 AM Go to last post
  11. Inter rater reliability

    I'm hoping someone might be able to help me figure out how best to analyse the data I have. For my research, subjects each create 3 small image...

    Started by willpy‎, 11-10-2010 11:45 AM
    • Replies: 0
    • Views: 3,581
    11-10-2010, 11:45 AM Go to last post
  12. 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: 5,733
    11-11-2010, 03:02 AM Go to last post
  13. Census & tests for significance?

    I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

    Started by pbakker‎, 11-12-2010 09:35 AM
    • Replies: 6
    • Views: 6,116
    11-12-2010, 02:09 PM Go to last post
  14. Question finding UMVUE

    let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

    Started by Sambit‎, 11-13-2010 07:45 AM
    • Replies: 3
    • Views: 6,995
    11-13-2010, 01:44 PM Go to last post
  15. Bootstrap Spearman coeff.: intepreting results

    Hi! I would very appreciate if someone can kindly provide some hints on the following issue. I am interested in the correlation between two...

    Started by gianmarco‎, 11-09-2010 11:29 AM
    • Replies: 6
    • Views: 9,726
    11-14-2010, 07:02 AM Go to last post
  16. 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: 2,790
    11-14-2010, 08:58 PM Go to last post
  17. Low population hypothesis testing

    Hi, I'm doing statistics for a friend of mine. Problem with the data is that there are only 64 responses. Questionnaire was distributed to a...

    Started by aretai‎, 11-10-2010 07:45 AM
    • Replies: 4
    • Views: 3,543
    11-16-2010, 06:28 AM Go to last post
  18. 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: 5,240
    11-18-2010, 04:47 AM Go to last post
  19. Samples drawn from distributions without means: What inferences from subsamples?

    I am doing some work for a small nonprofit on time trends in U.S. income inequality, and comparing estimates based on samples from different surveys....

    Started by AndrewHoerner‎, 11-02-2010 02:13 PM
    • Replies: 1
    • Views: 2,893
    11-19-2010, 01:05 AM Go to last post
  20. metropolis algorithm for ising model

    Hi i'm looking for some help with trying to understand how to use the metropolis algorithm for the 2D ising model. In the problem i am trying to...

    Started by vitaniarain‎, 11-19-2010 06:34 AM
    • Replies: 0
    • Views: 3,035
    11-19-2010, 06:34 AM Go to last post
  21. Question problem of finding MLE

    consider a sample X_1,X_2,.....,X_n the pdf given by f(x) = \frac{1}{\mu}e^-\frac{x-\mu}{\mu} , x>\mu, \mu>0 what is the MLE of \mu? ...

    Started by Sambit‎, 11-18-2010 08:12 AM
    • Replies: 4
    • Views: 3,386
    11-19-2010, 11:03 AM Go to last post
  22. grouping categorical variables for regression

    I'm working with survey data dealing with reproductive health among women with HIV. I would like to explore possible factors which may contribute to...

    Started by bomme‎, 11-20-2010 10:20 AM
    • Replies: 0
    • Views: 3,385
    11-20-2010, 10:20 AM Go to last post
  23. Mixed positive and negative correlations in a mediation model

    Can you offer any potential explanations for the following: Significant positive correlations between A and B, & B and C, but a significant negative...

    Started by pumpkinpatch‎, 11-20-2010 04:08 PM
    • Replies: 0
    • Views: 4,868
    11-20-2010, 04:08 PM Go to last post
  24. 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: 4,110
    11-20-2010, 07:14 PM Go to last post
  25. 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: 5,204
    11-22-2010, 08:38 AM Go to last post
  26. One sample t-test: help needed

    Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

    Started by scrap‎, 11-15-2010 12:30 PM
    • Replies: 8
    • Views: 3,723
    11-22-2010, 08:42 AM Go to last post
  27. 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: 3,376
    11-22-2010, 03:32 PM Go to last post
  28. 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: 11,782
    11-23-2010, 12:28 PM Go to last post
  29. 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: 2,348
    11-25-2010, 11:53 PM Go to last post
  30. 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: 4,647
    11-28-2010, 06:07 AM Go to last post
  31. Question what method use?

    good day, I'm working with spss, but firstly with multiple correleations. My dependent variables are: nurses, doctors, and other hospital...

    Started by tim999‎, 11-28-2010 11:46 AM
    • Replies: 0
    • Views: 2,176
    11-28-2010, 11:46 AM Go to last post
  32. 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: 3,291
    11-28-2010, 03:00 PM Go to last post
  33. Question MLE of bivariate normal

    how to calculate the MLEs of the 5 parameters of a bivariate normal population, the parameters being \mu_x,\mu_y,\sigma_x,\sigma_y,\rho? while...

    Started by Sambit‎, 11-26-2010 02:06 AM
    • Replies: 3
    • Views: 9,790
    11-30-2010, 02:23 AM Go to last post
  34. Combining Variables to Fill Missing Data

    Summary of Problem: 1. I want to combine three similar variables to fill severe missing data problem. Significance of problem: 1. My data is...

    Started by williamsons‎, 12-02-2010 05:19 AM
    • Replies: 0
    • Views: 3,037
    12-02-2010, 05:19 AM Go to last post
  35. Greatly unbalanced sizes of samples for Mann-Whitney U test.

    Hello, I want to compare two independent samples and by doing a little research I have concluded that the Mann-Whitney U test is the most...

    Started by LauraS‎, 12-01-2010 12:00 PM
    • Replies: 1
    • Views: 6,894
    12-02-2010, 05:55 AM Go to last post
  36. Conjoint analysis - orthogonal design

    Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

    Started by Frederik‎, 12-03-2010 09:46 AM
    • Replies: 0
    • Views: 5,886
    12-03-2010, 09:46 AM Go to last post
  37. Calculating and interpreting Spearman's Rank Correlation...

    Hi. I am completing an undergraduate research project and am having a bit of trouble completing the statistical analysis. I'll briefly run through...

    Started by Hedgehog‎, 11-24-2010 01:33 AM
    • Replies: 1
    • Views: 5,840
    12-04-2010, 04:15 AM Go to last post
  38. 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: 7,141
    12-04-2010, 04:43 AM Go to last post
  39. Repeated measure project.....which test?

    I am doing a project where I give subjects nicotine gum to chew for 30 minutes and then test them. They come in for a total of 2 visits. They either...

    Started by dcnaser‎, 12-04-2010 04:43 PM
    • Replies: 0
    • Views: 1,720
    12-04-2010, 04:43 PM Go to last post
  40. 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: 2,900
    12-04-2010, 05:18 PM Go to last post
  41. How do we do statistics on repeated phenomenon?

    Hi everyone, I've got a question on statistics on repeated phenomenons. For example, If I have a time series data which I used exploratory data...

    Started by hslinhc‎, 12-04-2010 05:28 PM
    • Replies: 0
    • Views: 3,365
    12-04-2010, 05:28 PM Go to last post
  42. Nominal variables

    I use a bivariate probit model to detect the choice between two strategies. I use besides the more interesting variables, some control variables....

    Started by momo‎, 12-05-2010 09:35 AM
    • Replies: 0
    • Views: 2,887
    12-05-2010, 09:35 AM Go to last post
  43. How to scale my data???

    The question i have is basically a scaling question. I have a set of data plotted as a time series. There is a general phenomena in sleep research...

    Started by marti‎, 11-30-2010 01:46 PM
    • Replies: 1
    • Views: 2,467
    12-06-2010, 02:17 PM Go to last post
  44. Unhappy Choosing an appropriate Statistical Test

    Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

    Started by uzymedphys‎, 08-14-2010 03:39 AM
    • Replies: 3
    • Views: 3,594
    12-06-2010, 11:36 PM Go to last post
  45. Model fit and Structural Equation Modelling

    I am performing an analysis with a structural equation model (using SPSS AMOS). I am trying to figure out how to interpret/report my results. I...

    Started by moneypenny02‎, 11-10-2010 09:23 PM
    • Replies: 4
    • Views: 8,209
    12-07-2010, 04:16 PM Go to last post
  46. Comparing ind. and dep. significance help!

    I'm working right now on a political science research paper and it's fairly involved in statistical analysis and I need some help and clarification....

    Started by burton160w‎, 12-06-2010 01:01 AM
    • Replies: 5
    • Views: 4,155
    12-08-2010, 12:24 AM Go to last post
  47. Application of Significance Testing

    SAMPLE SIZE: 518 in each city QUESTION: Likeness to have Coke after dinner. Positive Response to the Question: 320 in each city ...

    Started by bsaikrishna‎, 12-06-2010 02:47 AM
    • Replies: 6
    • Views: 5,722
    12-08-2010, 12:54 AM Go to last post
  48. 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: 4,155
    12-08-2010, 11:57 AM Go to last post
  49. Intermediate outcomes: use as predictors in logistic regression, or use Naive Bayes?

    I am predicting whether or not someone will receive a grant from an agency (dichotomous outcome). I have generated a model that uses various...

    Started by bernoulli‎, 12-08-2010 03:45 PM
    • Replies: 0
    • Views: 3,518
    12-08-2010, 03:45 PM Go to last post
  50. Question Testing the inter-rater reliability when data doesn't have a normal distribution

    Hello guys! What is a standard way of testing the inter-rater reliability when data doesn't have a normal distribution? I had a bunch of raters...

    Started by gvadalkivir‎, 12-08-2010 10:42 PM
    • Replies: 0
    • Views: 3,532
    12-08-2010, 10:42 PM Go to last post
  51. Statistical significance on financial ratios

    Hello! I am currently trying to determine whether or not the implementation of IFRS has had a statistically significant effect on the return over...

    Started by Strela‎, 12-10-2010 10:38 PM
    • Replies: 0
    • Views: 2,573
    12-10-2010, 10:38 PM Go to last post
  52. Finding cyclic function from points with more than 2 indep. variables

    Hello, I am doing my master thesis in Electrical engineering about the impact of the humidity and temperature on power consumption I have a...

    Started by aahh1982‎, 12-11-2010 08:45 PM
    • Replies: 0
    • Views: 3,279
    12-11-2010, 08:45 PM Go to last post
  53. URGENT! Need tutor for stat assignment!

    Hi I am looking for someone who is good at using R and G power to help me with a part of my research..Please contact asap if interested. Offer good...

    Started by wing999‎, 12-11-2010 11:22 PM
    • Replies: 0
    • Views: 2,459
    12-11-2010, 11:22 PM Go to last post
  54. test type

    What would be the best test if I want to know if a continuous predictor is dependent on a dichotomous criterion?

    Started by jgut217‎, 12-12-2010 02:58 PM
    • Replies: 0
    • Views: 2,410
    12-12-2010, 02:58 PM Go to last post
  55. What Measure - Nominal, Ordinal, Scale? SPSS

    I'm using SPSS to enter data and I just want to make sure I picked the appropriate measure for each variable State - Nominal Population - Scale...

    Started by burton160w‎, 12-11-2010 07:19 PM
    • Replies: 1
    • Views: 14,450
    12-14-2010, 07:22 PM Go to last post
  56. Likert/Chi-square

    Hello, I'm working on my analysis of my Graduate Capstone Project and was hoping to get some feedback to see if what I plan on doing is correct. ...

    Started by Fly_Navy‎, 11-28-2010 02:21 PM
    • Replies: 1
    • Views: 3,107
    12-15-2010, 09:34 PM Go to last post
  57. Question re: maximum observation value falling in third quartile

    :wave: You all have been my saviors in the past whenever I've been stuck with my stats. I need to figure how I interpret the fourth quartile...

    Started by Veronica‎, 12-14-2010 04:00 PM
    • Replies: 4
    • Views: 4,817
    12-16-2010, 10:23 AM Go to last post
  58. Randomization techniques

    Hi there, I was wondering whether you could recommend some simple randomization technique. I need to conduct a survey with a sample population...

    Started by Sylviastat‎, 12-21-2010 02:01 AM
    • Replies: 0
    • Views: 2,874
    12-21-2010, 02:01 AM Go to last post
  59. Exclamation Please Help me on an ANOVA !

    I currently work on a draft of an aquatic bioassessment. The conditions tested are the following: ER river water T dechlorinated water control 0.5 +...

    Started by soileil‎, 12-21-2010 05:58 PM
    • Replies: 1
    • Views: 1,988
    12-21-2010, 09:55 PM Go to last post
  60. 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: 5,181
    12-23-2010, 08:31 PM Go to last post

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