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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: 19,443
    10-11-2014, 12:02 PM Go to last post
  1. Need good, fast stats help, will pay, help on dissertation, inferential analysis ONLY

    I need a stats coach to sort out the inferential stats part of my dissertation - that's all. The SPSS file is done, I have 109 "good" pages of the...

    Started by purplelily‎, 01-21-2014 11:35 PM
    6 Pages
    1 2 3 ... 6
    • Replies: 77
    • Views: 8,776
    02-03-2014, 06:18 AM Go to last post
  2. Wink Stuck with my darn P value

    Hey guys So I've been doing some medical research and I have a great result by no idea how to approach working out the P value. Basically with...

    Started by PKrazda‎, 01-26-2017 12:24 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 14,374
    02-03-2017, 03:02 PM Go to last post
  3. Test of Significance?

    I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

    Started by columbia‎, 06-21-2011 09:49 PM
    3 Pages
    1 2 3
    • Replies: 42
    • Views: 8,031
    06-24-2011, 06:30 PM Go to last post
  4. Calculating the standard error of an odds ratio from the standard errors of 2 logits

    I've just completed a logistic regression model with a continuous covariate, and calculated the logit and standard errors using SAS for creating a...

    Started by Disvengeance‎, 12-13-2014 09:53 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 9,295
    12-18-2014, 10:02 PM Go to last post
  5. Feedback on bootstrapping effect size and t-values

    I am trying to learn to bootstrap per conversation here the other day. I know there are packages to bootstrap but wanted to process more...

    Started by trinker‎, 04-28-2015 01:07 PM
    3 Pages
    1 2 3
    • Replies: 31
    • Views: 5,141
    04-28-2015, 09:25 PM Go to last post
  6. Analysis of elections data?

    Dear All, I am currently writing an article on two parliamentary elections taking place in one country during 2009. Data consists of two exit-poll...

    Started by SAJ‎, 12-12-2009 12:45 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 11,947
    12-31-2009, 06:29 AM Go to last post
  7. Why does anyone bother to post questions here?

    A very large number have no answers. What's the point?

    Started by hcc‎, 06-02-2015 11:52 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 4,446
    06-05-2015, 05:18 AM Go to last post
  8. Representing a distance measure with math equation

    I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

    Started by trinker‎, 11-10-2013 09:56 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,273
    11-11-2013, 04:54 PM Go to last post
  9. [help]interpretation needed please

    How would you interpret the regression result is good or not?> How would you interpret coefficient and ? Would you reject the hypothesis that...

    Started by numerospy‎, 11-15-2013 10:28 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 3,868
    11-20-2013, 02:43 AM Go to last post
  10. Paired T-Test Debate

    Hey guys! I was having a little debate with a doctor on her study about which statistical test to use. I was always under the assumption that a...

    Started by gene2420‎, 03-06-2014 08:35 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 10,543
    03-10-2014, 04:12 PM Go to last post
  11. paired samples-equality of variance and 95% CI around difference

    Hi, Can a few of you please review the approach I plan to take for obvious errors? I have 50 subjects and each have a measure taken on the same...

    Started by seth‎, 08-02-2011 11:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 9,189
    08-06-2011, 10:29 PM Go to last post
  12. Post Which test to use for my data

    Hi, I am not sure which kind of test to use to analyse my data. Can anyone help? I collected 50 snails from 5 different sites & dissected to find...

    Started by palmer86‎, 04-09-2013 08:51 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 4,086
    04-22-2013, 02:07 AM Go to last post
  13. Help with choosing statistics

    Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

    Started by Dave4‎, 08-29-2011 10:43 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,734
    11-22-2011, 12:09 AM Go to last post
  14. 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: 6,861
    11-01-2010, 06:42 AM Go to last post
  15. Coding Data

    I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

    Started by eagle12‎, 08-24-2011 09:59 PM
    2 Pages
    1 2
    coding, correlation, data, research design
    • Replies: 21
    • Views: 6,136
    08-26-2011, 09:30 AM Go to last post
  16. finding the standard deviation and mean from frequency table

    I have a frequency table showing age distribition in Auckland supercity election 2010 and I have in the coloumns I have Age, frequency, percentage,...

    Started by newbiestats‎, 11-10-2011 07:00 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 21,544
    11-12-2011, 03:41 AM Go to last post
  17. Comparing two groups - best test to use?

    Hi all, I have two sets of data - hospital admission lengths (measured in whole hours) grouped in to 'younger patients' and 'older patients'....

    Started by AbnormallyDistributed‎, 08-29-2016 10:48 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,890
    09-06-2016, 03:43 PM Go to last post
  18. Does covariate must be observed variable?

    In my study, I found significant interactions between treatment and order of sessions. Can I put the order variable as covariate in order to control...

    Started by PsychologyS‎, 07-03-2017 04:34 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 1,872
    07-06-2017, 07:07 PM Go to last post
  19. ANOVA n00b questions

    Hello! I'm putting together a proposal and would like to conduct a certain type of analysis but my wording on this is rather weak so please correct...

    Started by mwill101‎, 11-07-2011 01:07 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,608
    11-07-2011, 10:09 PM Go to last post
  20. 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: 6,346
    08-13-2012, 12:31 AM Go to last post
  21. Which tests do I have to use in order to test my hypotheses?

    Dear sir/madam, I would like to test these hypotheses, but I'm still not sure which test I should use for it. Can anybody help me? Thanks...

    Started by Nadia1908‎, 10-29-2012 10:27 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,032
    11-01-2012, 01:09 PM Go to last post
  22. Is it meaningful to calculate a p-value based on a convenience sample?

    Ignore the bootstrap as a possibility. If the answer is no, then what is the point of stating the p-value (especially if it is, say, 0.10)?

    Started by woodbomb‎, 01-12-2016 09:18 AM
    2 Pages
    1 2
    convenience, p-value, significance
    • Replies: 20
    • Views: 5,619
    01-16-2016, 05:47 PM Go to last post
  23. How to take into account different treatments, doses and starting health

    Hello all, first thread so please be kind! I have rudimentary statistics knowledge of anovas and regression but am piling through how-to videos of...

    Started by Rickyroughneck‎, 08-12-2017 03:22 PM
    2 Pages
    1 2
    logit, mixed model
    • Replies: 20
    • Views: 1,245
    08-21-2017, 04:06 PM Go to last post
  24. 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: 8,169
    08-16-2010, 11:59 AM Go to last post
  25. Hey Guys I'm new and I need help

    So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

    Started by adrianbrah‎, 01-16-2012 12:35 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,809
    02-03-2012, 01:00 PM Go to last post
  26. Polychoric Principal Component Analysis

    Hi everyone: I am working with a questionnaire to evaluate socioeconomic position in a sample. It was basically counting a list of items to assess...

    Started by JavierM88‎, 06-23-2014 12:08 PM
    2 Pages
    1 2
    pca, polychoric
    • Replies: 19
    • Views: 8,159
    06-27-2014, 01:30 PM Go to last post
  27. Urgent, which test can I use to test this hypothesis???

    Hi all, please help me I am stuggling doing my data analysis of my poject and my supevisor is on holiday but I have to finish all the ananlysis in...

    Started by nane‎, 07-17-2011 09:47 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,004
    07-17-2011, 05:16 PM Go to last post
  28. testing rates through time

    Hello all, this seems like it should be a simple questions but our team cannot find an answer to the question. If I have data set up like the...

    Started by shanehall.m‎, 10-11-2011 09:31 AM
    2 Pages
    1 2
    proportion, rates, time series, trend
    • Replies: 18
    • Views: 6,536
    10-13-2011, 09:04 AM Go to last post
  29. Low Cronbach alpha on recognised instrument

    Hi, I am using a standard survey instrument that during a meta analysis over 15 years has shown a relability of 0.73 for a particular facet. I...

    Started by JakeMac‎, 03-12-2013 06:21 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 16,677
    03-13-2013, 07:08 AM Go to last post
  30. Factor analysis, what type of data can I use?

    Hello everyone, I have a social science dataset composed of circa 40 variables. The data types I am using are quite diverse. The variables I am...

    Started by parsec2011‎, 07-02-2013 12:58 PM
    2 Pages
    1 2
    binary, likert, logistic, logit, polychoric correlation
    • Replies: 18
    • Views: 8,094
    07-08-2013, 11:38 AM Go to last post
  31. Generating Skewed Normal Distributions

    I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

    Started by kanny_g‎, 02-04-2009 04:33 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 43,854
    06-03-2016, 10:10 PM Go to last post
  32. 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: 7,109
    07-04-2010, 05:19 AM Go to last post
  33. Smile Appropriate method for research model

    Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

    Started by icsd04‎, 07-22-2011 09:33 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 7,016
    07-26-2011, 10:11 PM Go to last post
  34. Was thinking Kendall's Tau but...(correlation)

    Hey guys, I was wondering if you could help me out with this: I have seven sites along the west coast each with two types of data and several...

    Started by aesopclimber‎, 07-20-2011 11:39 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,476
    08-15-2011, 08:06 PM Go to last post
  35. Best design for this experiment?

    Hello all. I am having some trouble with my experiment and would be the best way to analyze the data. I have 4 different chemicals each at one...

    Started by daelve‎, 08-25-2011 07:08 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,113
    08-26-2011, 04:55 PM Go to last post
  36. Non-parametric equivalent of a factorial anova (not repeated measures)?

    Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

    Started by chegginson‎, 12-03-2011 09:54 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 27,224
    12-03-2011, 03:52 PM Go to last post
  37. Article on logistic regression - don't understand logic of statement.

    The author Menard, has written a good deal on this topic and this is from a recent (2011) journal article. This makes sense. But I don't...

    Started by noetsi‎, 06-25-2013 01:54 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,670
    06-26-2013, 11:44 AM Go to last post
  38. Alternatives for Non-normality and Inequality of Variance?

    I've been working with a rather difficult data set for over a week with no real progress. I am trying to compare the effect of temperature (15, 20,...

    Started by nebulus‎, 03-17-2017 11:04 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,947
    03-22-2017, 07:22 AM Go to last post
  39. obtain inter-aarival from bulk arrival

    I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

    Started by mohsenhs82‎, 02-16-2017 05:22 PM
    2 Pages
    1 2
    arrival time, probabilities, queuing theory, random variable, stochastic
    • Replies: 16
    • Views: 3,301
    02-19-2017, 05:24 PM Go to last post
  40. 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: 7,580
    08-14-2010, 08:41 AM Go to last post
  41. Contradictory Results re. Normality Tests

    Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

    Started by eoinmc‎, 04-26-2011 10:17 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 10,351
    06-13-2011, 03:43 PM Go to last post
  42. Thumbs up Would you help me? (Tranformations)

    Hi, I was looking for tranformations for ratio data. I find that arcsine tranformation is adecuate for that kind of data (ratio). For that...

    Started by sureño‎, 05-07-2012 07:50 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,687
    06-06-2012, 09:07 AM Go to last post
  43. Tukey HSD after ANOVA

    Hi there, i have some trouble in understanding the Tukey HSD. Can you help me out please? I already did a 3x2(low vs middle vs high HRV level x...

    Started by Flowerpower‎, 09-12-2012 08:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 13,292
    09-13-2012, 07:13 AM Go to last post
  44. What to do when number of variables is greater than number of observations?

    What are some techniques that are utilized when the number of predictors is greater than the number of observations?

    Started by lord12‎, 01-30-2013 04:12 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,217
    02-15-2013, 02:36 PM Go to last post
  45. How to generate an autocorrelated random variable?

    Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

    Started by consuli‎, 03-04-2015 05:06 PM
    2 Pages
    1 2
    autocorrelation
    • Replies: 15
    • Views: 5,313
    03-11-2015, 01:08 PM Go to last post
  46. Does anybody have a calculus example for Bartlett and Levene tests?

    Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

    Started by quantster‎, 09-01-2010 02:54 PM
    • Replies: 14
    • Views: 6,709
    09-07-2010, 05:59 AM Go to last post
  47. What test can I use to compare categorical and continuous variables?

    Hello guys: I have two sets of data, actual outcome (live vs. dead), which is categorical, and a risk adjustment predicted outcome, which is...

    Started by scerab‎, 08-09-2011 03:44 AM
    • Replies: 14
    • Views: 13,397
    08-09-2011, 02:58 PM Go to last post
  48. How to obtain individual factor scores after PCAs on multple imputed datsets???

    Hello, I really hope, someone here can help me, I've searched the internet for hours and could not get any clue on how to solve my problem. I...

    Started by marbar‎, 12-29-2011 08:24 AM
    • Replies: 14
    • Views: 6,777
    05-09-2015, 07:04 AM Go to last post
  49. Smile Selecting the RIGHT method this analysis --->

    Any help with the following would be greatly appreciated. I have a model of the form: Y = \mu +C +X+S+e where Y is continuous and C,X and S...

    Started by loglikely‎, 07-17-2012 02:35 PM
    • Replies: 14
    • Views: 3,529
    08-13-2012, 05:17 PM Go to last post
  50. Help with inter-rater reliability

    Hi all, I've got a set of data that I need some advice on. I'm working on a pilot project where a group of four people evaluate essays. The way that...

    Started by Blank‎, 09-05-2012 02:17 PM
    reliability
    • Replies: 14
    • Views: 4,007
    09-07-2012, 05:13 PM Go to last post
  51. 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: 2,758
    04-26-2013, 08:59 PM Go to last post
  52. Sample Size Calc for Right Skewed Data

    I have a request from a person for a sample size calculation. When I requested information about the potential study data they provided two means and...

    Started by hlsmith‎, 06-09-2017 10:44 PM
    power, simulation
    • Replies: 14
    • Views: 1,901
    06-14-2017, 11:30 AM Go to last post
  53. Red face Could anyone recommend an interactive application for mass data analysis?

    Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

    Started by bestbird7788‎, 05-22-2012 02:53 AM
    analysis, database, interactive, mass data, sql
    • Replies: 13
    • Views: 3,260
    05-31-2012, 09:25 PM Go to last post
  54. Multiple Group Analysis necessary?

    Hi, for my master's thesis I collected data with an online survey, measuring consumer behaviour. I used two samples, one group from Australia and...

    Started by robertz‎, 09-01-2010 06:15 AM
    • Replies: 13
    • Views: 16,765
    06-22-2012, 03:05 PM Go to last post
  55. Arrow Small sample size, correlation

    Ok, I am helping someone to run spss on his data,He just wants to know the results and not advice.But still I am hating my gut because his method...

    Started by SadieKhan‎, 10-11-2010 12:09 AM
    • Replies: 13
    • Views: 23,848
    10-11-2010, 02:31 PM Go to last post
  56. Inter-observer variability

    Dear all, I hope so much anyone here may help me with my question regarding inter-observer variability: 3 observers measure the diameter of...

    Started by med1234‎, 06-29-2011 06:15 PM
    • Replies: 13
    • Views: 24,212
    07-02-2011, 06:36 PM Go to last post
  57. Linear Mixed Models in SPSS for repeated measures

    I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

    Started by Elvin Roest‎, 08-04-2011 05:16 PM
    • Replies: 13
    • Views: 12,996
    08-08-2011, 04:38 AM Go to last post
  58. Thumbs up Research Ethics

    If allowed, should animal research be limited to research that investigates cures for terminal illnesses, or should they continue to be used in any...

    Started by meshelle‎, 01-13-2012 12:57 PM
    • Replies: 13
    • Views: 3,940
    01-23-2012, 09:06 PM Go to last post
  59. The joint normality of the two estimates for linear regression model

    I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

    Started by waynetang‎, 12-21-2012 12:46 PM
    • Replies: 13
    • Views: 3,297
    12-22-2012, 12:27 PM Go to last post
  60. pre- post- intervention survey analysis

    Hi all, I am trying to figure out how to analyze survey results administered as part of a randomized trial. We drew random samples of households...

    Started by siny911‎, 03-04-2013 03:40 PM
    anova, experiment
    • Replies: 13
    • Views: 5,835
    03-05-2013, 11:42 AM Go to last post

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