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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: 18,727
    10-11-2014, 12:02 PM Go to last post
  1. Post testing for the change in correlation between 2 variables over a 3rd linear variable

    I have a hypothesis that the strength of correlation between two continuous variables will decrease with higher levels of a third variable. To give...

    Started by dtae‎, 01-09-2011 02:04 PM
    continuous, correlation, interaction, regression, z-score
    • Replies: 0
    • Views: 3,342
    01-09-2011, 02:04 PM Go to last post
  2. Repeated measures anova or t test

    Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

    Started by pcastro‎, 12-17-2010 01:25 PM
    • Replies: 3
    • Views: 6,725
    01-08-2011, 12:43 PM Go to last post
  3. Football(Soccer) Betting Model Inference

    Please sorry for reposting, I had a problem with my pictures in post, they were stored on my computer. I think it's better to attach them to the...

    Started by Valen‎, 01-07-2011 03:12 AM
    • Replies: 0
    • Views: 3,525
    01-07-2011, 03:12 AM Go to last post
  4. 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: 5,167
    01-06-2011, 01:12 PM Go to last post
  5. 2 Dice Rolls vs. 1 Target Number

    Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

    Started by Mechalus‎, 01-05-2011 05:42 PM
    • Replies: 3
    • Views: 4,124
    01-06-2011, 11:09 AM Go to last post
  6. G*Power 3.12 Help

    Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

    Started by Ryman1510‎, 01-06-2011 11:09 AM
    • Replies: 0
    • Views: 3,012
    01-06-2011, 11:09 AM Go to last post
  7. an event study? I can't stand. which way should I choose?

    Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

    Started by tiago2‎, 01-01-2011 07:12 AM
    • Replies: 3
    • Views: 6,395
    01-02-2011, 06:15 PM Go to last post
  8. 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: 5,586
    01-02-2011, 05:57 AM Go to last post
  9. Thumbs up Industry effects

    Hi! I'm currently doing my master's thesis and I came accross the following problem: I have an (unbalanced) panel data sample consisting of...

    Started by AmosAnderson‎, 12-29-2010 06:43 AM
    • Replies: 1
    • Views: 1,895
    01-01-2011, 11:02 PM Go to last post
  10. Survey statistics

    Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

    Started by edwardoconnor‎, 12-17-2010 07:34 PM
    • Replies: 4
    • Views: 2,828
    01-01-2011, 02:20 PM Go to last post
  11. Help requested for difficult data set

    Would really appreciate any insights, please. I administered a survey to 20 participants, consisting of 136 images, and I asked them to rate each...

    Started by Statisticallychallenged‎, 12-31-2010 03:32 PM
    • Replies: 0
    • Views: 1,993
    12-31-2010, 03:32 PM Go to last post
  12. Factor Analysis vs Correspondence Analysis

    I was just reading about Factor and Correspondence Analysis. I am a bit confused from the time I realised that Correspondence Analysis also uses...

    Started by bsaikrishna‎, 12-27-2010 12:31 AM
    • Replies: 1
    • Views: 7,240
    12-27-2010, 05:00 AM Go to last post
  13. 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: 4,783
    12-25-2010, 06:14 AM Go to last post
  14. 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: 5,173
    12-23-2010, 08:31 PM Go to last post
  15. 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: 1,987
    12-21-2010, 09:55 PM Go to last post
  16. 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: 2,869
    12-21-2010, 02:01 AM Go to last post
  17. 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: 4,806
    12-16-2010, 10:23 AM Go to last post
  18. 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: 3,104
    12-15-2010, 09:34 PM Go to last post
  19. 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: 14,440
    12-14-2010, 07:22 PM Go to last post
  20. 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: 2,405
    12-12-2010, 02:58 PM Go to last post
  21. 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: 2,454
    12-11-2010, 11:22 PM Go to last post
  22. 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: 3,268
    12-11-2010, 08:45 PM Go to last post
  23. 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: 2,564
    12-10-2010, 10:38 PM Go to last post
  24. 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: 3,529
    12-08-2010, 10:42 PM Go to last post
  25. 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: 3,513
    12-08-2010, 03:45 PM Go to last post
  26. 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: 4,146
    12-08-2010, 11:57 AM Go to last post
  27. 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: 5,707
    12-08-2010, 12:54 AM Go to last post
  28. 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: 4,147
    12-08-2010, 12:24 AM Go to last post
  29. 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: 8,200
    12-07-2010, 04:16 PM Go to last post
  30. 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: 3,592
    12-06-2010, 11:36 PM Go to last post
  31. 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: 2,463
    12-06-2010, 02:17 PM Go to last post
  32. 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
  33. 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: 3,355
    12-04-2010, 05:28 PM Go to last post
  34. 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: 2,898
    12-04-2010, 05:18 PM Go to last post
  35. 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: 1,715
    12-04-2010, 04:43 PM Go to last post
  36. 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: 7,131
    12-04-2010, 04:43 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: 5,831
    12-04-2010, 04:15 AM Go to last post
  38. 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: 5,879
    12-03-2010, 09:46 AM Go to last post
  39. 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: 6,876
    12-02-2010, 05:55 AM Go to last post
  40. 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: 3,034
    12-02-2010, 05:19 AM Go to last post
  41. 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: 9,781
    11-30-2010, 02:23 AM Go to last post
  42. 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: 3,285
    11-28-2010, 03:00 PM Go to last post
  43. 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: 2,170
    11-28-2010, 11:46 AM Go to last post
  44. 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: 4,636
    11-28-2010, 06:07 AM Go to last post
  45. 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: 2,344
    11-25-2010, 11:53 PM Go to last post
  46. 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: 11,766
    11-23-2010, 12:28 PM Go to last post
  47. 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: 3,368
    11-22-2010, 03:32 PM Go to last post
  48. 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: 3,720
    11-22-2010, 08:42 AM Go to last post
  49. 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: 5,189
    11-22-2010, 08:38 AM Go to last post
  50. 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: 4,104
    11-20-2010, 07:14 PM Go to last post
  51. 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: 4,860
    11-20-2010, 04:08 PM Go to last post
  52. 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: 3,380
    11-20-2010, 10:20 AM Go to last post
  53. 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: 3,382
    11-19-2010, 11:03 AM Go to last post
  54. 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: 3,031
    11-19-2010, 06:34 AM Go to last post
  55. 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: 2,880
    11-19-2010, 01:05 AM Go to last post
  56. 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: 5,231
    11-18-2010, 04:47 AM Go to last post
  57. 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: 3,537
    11-16-2010, 06:28 AM Go to last post
  58. 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: 2,781
    11-14-2010, 08:58 PM Go to last post
  59. 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: 9,716
    11-14-2010, 07:02 AM Go to last post
  60. 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: 6,980
    11-13-2010, 01:44 PM Go to last post

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