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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: 18,731
    10-11-2014, 12:02 PM Go to last post
  1. One Sample T-Test with Likert Scale Questionnaire

    Hi all, I am doing a research and will study the how user think about shopping online. In my questionnaire, I have 3 questions - using Likert...

    Started by kenzq‎, 04-17-2009 03:08 AM
    • Replies: 8
    • Views: 66,500
    12-17-2016, 02:18 AM Go to last post
  2. Factor Analysis vs. Principal Component Analysis

    I've asked this question on here a while back but didn't quite get an answer that helped me understand what is truly different about these two...

    Started by lancearmstrong1313‎, 01-02-2013 01:50 PM
    • Replies: 8
    • Views: 4,158
    01-09-2013, 07:31 PM Go to last post
  3. Need urget help for one sample z test of proportions

    Hi All, I need to confirm whether I am doing it correctly. Survey question is: Have you ever witnessed violent episodes/incidents in the...

    Started by Markkkkk‎, 02-08-2013 01:49 AM
    one sample, proportion, statistical research, z test
    • Replies: 8
    • Views: 1,839
    02-14-2013, 05:42 AM Go to last post
  4. Regression

    Hi All, I have a quick question about the correlation before conducting regression. If there was no correlation between x and y, is there any...

    Started by ghada8888‎, 04-12-2013 12:43 PM
    • Replies: 8
    • Views: 1,434
    04-12-2013, 03:12 PM Go to last post
  5. How to compare multiple testers wine ratings?

    Newbie alert! Problem description: I have 20 wines and 6 tasters. Each taster ranks the wines from 1 to 20. Question: How do I test the...

    Started by achalk‎, 06-24-2013 07:05 PM
    • Replies: 8
    • Views: 1,481
    06-25-2013, 07:48 AM Go to last post
  6. Health center level data to client level data?? posible?

    I have data for 31 centers (observations) and have the following variables of interest. Ex: IDcenter= 1 client_black=25 client_white 50...

    Started by Marvin85‎, 07-30-2013 09:23 AM
    • Replies: 8
    • Views: 2,007
    08-08-2013, 01:13 PM Go to last post
  7. normal distribution

    I tried three transformations (LG10, SQRT, rank transformation). But I couldn't make the data normally distributed. Could you kindly let me know if...

    Started by eunkum‎, 09-04-2013 05:26 PM
    • Replies: 8
    • Views: 2,082
    09-04-2013, 06:54 PM Go to last post
  8. Unable to determine the right test?

    hello, I'm doing a paper on measuring authors productivity and unable to decide what should I use as my statistical test to come up with solid...

    Started by iha2005‎, 10-10-2013 04:23 PM
    • Replies: 8
    • Views: 2,393
    10-20-2013, 01:09 PM Go to last post
  9. adj. r-square

    I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

    Started by eunkum1‎, 05-02-2014 01:20 PM
    • Replies: 8
    • Views: 3,159
    05-02-2014, 05:10 PM Go to last post
  10. Need help with Multiple Imputations ("pooled" dataset)

    Hello everybody, My original data set (n=901) contains missing values (10-20% per variable). I am applying Multiple Imputations technique using...

    Started by kiton‎, 06-20-2014 11:39 AM
    • Replies: 8
    • Views: 3,935
    06-23-2014, 02:07 PM Go to last post
  11. Question Are they misunderstanding ANOVAs here?

    Hi, Here's an extract from a paper I'm using in a systematic review: The mean GAD-7 score of the sample prior to the course was 10.98 (SD 5.17,...

    Started by fishfishfish3‎, 10-23-2014 11:56 AM
    anova, post hoc
    • Replies: 8
    • Views: 2,466
    10-24-2014, 11:22 AM Go to last post
  12. Looking to hire freelance statistician

    I'm sorry if this isn't the right thread to post this question, but here goes. I'm looking for a statistician to do some freelance work, but I'm...

    Started by jonmrich‎, 11-13-2014 11:05 AM
    • Replies: 8
    • Views: 2,258
    11-13-2014, 01:07 PM Go to last post
  13. mean+standard deviation+skewness+kurtosis

    hi I want to order some variables according to (mean+standard deviation+skewness+kurtosis) or some new rule considering mean value, standard...

    Started by WEIBO‎, 03-06-2015 05:51 AM
    kurtosis, skewness
    • Replies: 8
    • Views: 2,480
    03-06-2015, 02:25 PM Go to last post
  14. What to do when survey participants answer all '4's?

    I reached out to members of my organization to rank how they felt the company was performing on various topics, about 35 questions in total. Several...

    Started by Jane M‎, 07-09-2015 10:14 AM
    • Replies: 8
    • Views: 1,600
    07-09-2015, 12:24 PM Go to last post
  15. Suggestions PLEASE.

    I work for a company that sells products online. I am attempting to create a common sense SOP for our email marketing campaigns and have plenty...

    Started by m_edmonson‎, 10-21-2015 02:47 PM
    • Replies: 8
    • Views: 1,914
    10-22-2015, 05:22 PM Go to last post
  16. Costant coefficient in logit model

    Hello, I would like to make sure of my argument. Am I right when I say that a constant coefficient in logit model MUST BE close to zero ?? ...

    Started by russel2000‎, 11-21-2015 09:33 AM
    • Replies: 8
    • Views: 1,503
    11-23-2015, 11:51 AM Go to last post
  17. Measuring effect - urgent

    Hi Guys, For my thesis, I am researching the influence of colour (IV) on product attractiveness (DV). Respondents in my experiment choose one of 7...

    Started by Jeroennn‎, 08-01-2016 04:38 AM
    • Replies: 8
    • Views: 1,850
    08-01-2016, 01:05 PM Go to last post
  18. Best Stat Question Ever?

    Got this off Twitter (@galka_max) and found it interesting: If you choose an answer to this question at random, what is the chance you will get it...

    Started by The Game‎, 06-20-2017 09:42 PM
    • Replies: 8
    • Views: 882
    09-06-2017, 01:14 AM Go to last post
  19. Is survey design statistically correct?

    I want to track improvements in how yoga class participants feel on various variables (e.g. energy level, sleep quality, pain felt, mental...

    Started by johnsif‎, 03-30-2017 02:47 AM
    • Replies: 8
    • Views: 1,392
    04-02-2017, 10:33 AM Go to last post
  20. Joint Normal CDF

    Hello I am new to this forum as well as to actuary field. I have this question: There are two random variables X_1 and X_2 following standard...

    Started by hpriye‎, 06-19-2008 05:10 AM
    • Replies: 7
    • Views: 7,545
    06-20-2008, 08:13 AM Go to last post
  21. markov chain modelling

    Hi guys, Got a complex question regarding markov chain modelling. I'll start off with an example. Say you own a credit card and you can only...

    Started by ace123‎, 08-22-2008 04:51 PM
    • Replies: 7
    • Views: 4,480
    08-23-2008, 09:12 PM Go to last post
  22. Expected Value of a Sample Range

    The function for the expected value of a sample range is given on the following page. http://www.jmu.edu/docs/sasdoc/sashtml/qc/chapc/sect9.htm ...

    Started by Papabravo‎, 10-15-2008 12:27 PM
    • Replies: 7
    • Views: 17,497
    10-16-2008, 07:34 PM Go to last post
  23. (non-)parametric test dilemma

    I want to compare means of 6 variables and to do correlation analysis. I did Kolmogorov-Smirnov test and it showed that 3 of them are normally...

    Started by rmil‎, 06-17-2009 10:45 AM
    • Replies: 7
    • Views: 7,213
    06-22-2009, 07:50 PM Go to last post
  24. residuals against Y

    Hi all- I'm looking for an argument / example in simple linear regression, if you plot the residuals against Y, there appears to be a relationship...

    Started by B_Miner‎, 09-29-2009 03:06 PM
    • Replies: 7
    • Views: 7,529
    09-30-2009, 11:23 AM Go to last post
  25. Question: making a positive case for "no effect"

    I have the results of a basic web-based marketing test. Visitors were randomly sent to one of several pages with a binary outcome of "sale" or "no...

    Started by dwilson‎, 10-21-2009 05:10 PM
    • Replies: 7
    • Views: 3,933
    10-26-2009, 03:23 PM Go to last post
  26. Comparing two distributions using random drawing.

    Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

    Started by ThomasAG‎, 03-07-2010 03:59 PM
    • Replies: 7
    • Views: 3,930
    09-18-2011, 08:11 AM Go to last post
  27. how to find the UMVUE of the location parameter under t distribution

    f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}} , v>=3 i have no...

    Started by egpivo‎, 04-03-2010 01:10 AM
    • Replies: 7
    • Views: 5,980
    04-04-2010, 09:05 AM Go to last post
  28. How to find out the specific association of a particular age bracket to a particular

    If I have a table (mXn) that contains the rows of age brackets (like 25-35 years, 35-45 years, 46-60 years) and three columns of low stress, medium...

    Started by Dr.Appalayya‎, 04-06-2010 03:54 AM
    • Replies: 7
    • Views: 3,651
    04-10-2010, 10:15 AM Go to last post
  29. 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: 5,729
    06-26-2010, 04:52 AM Go to last post
  30. 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: 3,783
    06-25-2010, 11:03 AM Go to last post
  31. paired T-test or anova

    Dear all just a quick simple one this time. if i had two sets of runners (in a race) for example and these two groups were linked only by the fact...

    Started by yoma819‎, 08-22-2010 05:51 PM
    • Replies: 7
    • Views: 5,598
    08-23-2010, 10:53 PM Go to last post
  32. Correlation Proof

    Hi guys, wondering if you could help me with a proof that I am trying to figure out. Here it is... Corr (A, B) = 0 and Corr (B, C) = 0. This...

    Started by statsq45‎, 09-25-2010 06:24 PM
    • Replies: 7
    • Views: 6,637
    10-07-2010, 03:34 PM Go to last post
  33. type of study?

    In a poll of 20,000 randomly selected college seniors, it was determined that 95% of them have a cell phone. What is the type of this...

    Started by SadieKhan‎, 10-21-2010 08:41 AM
    • Replies: 7
    • Views: 2,274
    10-21-2010, 12:57 PM Go to last post
  34. Uninformative gamma prior for Poisson distribution

    Hi! I want to use Poisson distribution in my research to model some waiting times and I want to set the gamma prior to its parameter. I want the...

    Started by karamnula‎, 01-16-2011 06:27 AM
    • Replies: 7
    • Views: 20,570
    01-17-2011, 03:16 AM Go to last post
  35. Please help me in identifying proper Stat Tool

    I asked for help few days back, but probably my question was not clear that time. I have asked e-gov experts to rank some issues related to e-gov...

    Started by dibakar‎, 01-19-2011 02:01 AM
    • Replies: 7
    • Views: 2,467
    01-19-2011, 05:19 AM Go to last post
  36. Question Normality analysis

    hye guys... i need a help.. Can someone show me how to run the normality analysis... In my questionnaires, I have 4 independent variables and...

    Started by ryan88‎, 01-26-2011 11:08 AM
    • Replies: 7
    • Views: 3,169
    02-09-2011, 06:58 PM Go to last post
  37. Any way to test significance?

    First off, pardon my novice-level knowledge of statistics. If I make any ridiculous assumptions or whatever, this is why! So I'm doing a bit of...

    Started by chaoninja‎, 03-05-2011 07:18 PM
    • Replies: 7
    • Views: 3,365
    03-07-2011, 02:59 AM Go to last post
  38. Difference needed for power in fixed population.

    Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a...

    Started by schisms‎, 03-23-2011 05:38 AM
    power, significance
    • Replies: 7
    • Views: 3,392
    03-25-2011, 12:34 PM Go to last post
  39. Calculating Effect Size

    Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

    Started by shafiqurrehman1‎, 05-17-2011 01:01 AM
    • Replies: 7
    • Views: 4,518
    05-24-2011, 11:57 PM Go to last post
  40. Analyzing with heavy skew, transforms not working?

    I have a set with around 200 individuals dealing with cognitive task scores. Most of it is skewed heavily and I'm trying to analyze ideally with a...

    Started by excellrec‎, 05-19-2011 02:25 PM
    • Replies: 7
    • Views: 2,768
    05-24-2011, 06:08 PM Go to last post
  41. ANOVA vs. T-Test --> completely different results

    If I compare three treatment groups with ANOVA (and Bonferroni posttesting), I get no significant difference results between groups (p>0.05)......

    Started by med1234‎, 06-13-2011 02:16 PM
    • Replies: 7
    • Views: 18,287
    06-14-2011, 12:14 AM Go to last post
  42. P Value...should I trust it ?

    Hello, I am trying to detect significant differences in response of some device, among two groups: healthy and sick people. I ran a t-test,...

    Started by NN_STAT‎, 07-28-2011 02:00 AM
    • Replies: 7
    • Views: 3,503
    07-28-2011, 10:47 AM Go to last post
  43. On what statistical significance test should I use

    Hi everyone, First and foremost, my skills in statistics are quite basic so what I am about to ask may sound very stupid. That being said, here...

    Started by Applepip‎, 08-22-2011 06:22 PM
    • Replies: 7
    • Views: 2,260
    08-24-2011, 01:33 PM Go to last post
  44. paired or unpaired T-Test or even some other test?

    Hello there, I am trying to help out some students of medicine who are writing at their phd-thesis in germany. they have data from several...

    Started by Kullukschan‎, 09-14-2011 11:50 AM
    • Replies: 7
    • Views: 3,634
    09-14-2011, 07:18 PM Go to last post
  45. How to Analyze this data?

    OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

    Started by DFoley‎, 10-03-2011 06:02 PM
    • Replies: 7
    • Views: 3,158
    10-05-2011, 11:38 AM Go to last post
  46. non-significant Paired T-test, what happens next??

    Hi, I'm analysing my data for my master's dissertation and I'm having problems! I have 3 "before" and "after" treatment groups (n=20 each) and...

    Started by Joelle‎, 10-30-2011 12:48 PM
    anova, paired t-test
    • Replies: 7
    • Views: 8,147
    11-09-2011, 12:42 PM Go to last post
  47. Question question about null hypothesis??

    here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

    Started by heymandy‎, 01-25-2012 11:54 PM
    • Replies: 7
    • Views: 2,996
    01-27-2012, 04:37 AM Go to last post
  48. Red face Convergent and Divergent Validity

    Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

    Started by mae‎, 03-05-2012 10:07 AM
    • Replies: 7
    • Views: 3,601
    03-06-2012, 10:30 AM Go to last post
  49. Methodology For Sports Statistics Projections

    Good day! I am new to statistics and I want to try my hand at creating sports statistics projections. I'm posting in this thread because my first...

    Started by mightyeskimo‎, 03-05-2012 02:22 PM
    • Replies: 7
    • Views: 3,751
    03-07-2012, 01:08 PM Go to last post
  50. Counter-intuitive results with Bold-Brunell panel data estimator (DV-INDEX)

    Hi All, I am doing Brunell-Bond panel data analysis and the results seem completely counter-intuitive. The DV is a food prices index - and so if...

    Started by SylviaS‎, 04-09-2012 01:53 PM
    • Replies: 7
    • Views: 1,958
    04-09-2012, 03:23 PM Go to last post
  51. Correlations between twins - who is X and wo is Y?

    I have some data on twins (all fraternal) and I'm trying to see if there is any correlation between them on several measures (e.g., body...

    Started by andrewkent‎, 05-24-2012 02:50 PM
    correlation, twin studies, twins
    • Replies: 7
    • Views: 2,681
    05-24-2012, 04:33 PM Go to last post
  52. Student -T with big sample

    If the population variance is unknown and the sample size is >30, can I proceed to use Student-T to compute confidence interval ? or I have to use ...

    Started by ryan8200‎, 05-25-2012 04:22 AM
    • Replies: 7
    • Views: 2,384
    05-28-2012, 02:04 AM Go to last post
  53. Test of Significance advice needed

    I'm currently in high school doing my IB. I've been sifting through hundreds of CAT scans and x-rays that have been kindly donated to me by various...

    Started by SomeGuy‎, 06-20-2012 11:31 PM
    • Replies: 7
    • Views: 2,070
    07-12-2012, 07:48 PM Go to last post
  54. simple multivariate question

    I have, I think, a simple question about multivariate statistics, and I'm not sure which test (or even what kind of test does this). I have 40...

    Started by jbc165‎, 07-01-2012 02:24 PM
    multivariate, time series
    • Replies: 7
    • Views: 2,411
    07-16-2012, 03:46 PM Go to last post
  55. Mutlivariate Analysis/Using Controls

    Disclaimer: I'm a student in the social sciences with *very* elementary training in quantitative methods. If I am testing the relationship...

    Started by SG5‎, 08-07-2012 10:49 PM
    • Replies: 7
    • Views: 1,951
    08-17-2012, 10:22 AM Go to last post
  56. small sample size

    Hi! I want to compare 27 groups with each other, with each group consisting out of 3 or 4 samples. Can I use a one-way ANOVA or Kruskal-Wallis test...

    Started by Ine‎, 08-22-2012 07:06 AM
    • Replies: 7
    • Views: 1,585
    10-30-2012, 12:03 AM Go to last post
  57. Unhappy No idea how to perform my statistical analysis...

    Hello everybody! I'm new here... I'm really need help with this issue... Now I am so lost that I do have no idea how to do the stats for one of my...

    Started by hauptner‎, 08-30-2012 01:22 PM
    • Replies: 7
    • Views: 2,592
    09-18-2012, 09:55 AM Go to last post
  58. What statistical procedures do I need to know to be a proficient psychologist?

    Or epidemiologist? Also, Do I need to go back and study matrix algebra in detail? Thank you? What are your experiences?

    Started by sampier85‎, 09-18-2012 04:25 PM
    applied statistics, psychology, regression analysis
    • Replies: 7
    • Views: 2,352
    09-20-2012, 12:48 PM Go to last post
  59. Calculate SD from mean and 95% CI

    Dear Friends I'm reading a paper that has the following table: Year, n, measure (SD) 2008, 536 0.25 (0.13) 2010, 536 0.21...

    Started by SiBorg‎, 10-03-2012 03:58 PM
    • Replies: 7
    • Views: 4,604
    10-03-2012, 06:31 PM Go to last post
  60. How does observation error effect a minimal sample size for a t test?

    Hello, I calculate minimal sample size to compare means of two groups (different treatment) of datapoints by a t test. For continuously...

    Started by bondsergey‎, 10-26-2012 12:11 PM
    • Replies: 7
    • Views: 1,998
    10-30-2012, 05:54 PM Go to last post

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