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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: 18,733
    10-11-2014, 12:02 PM Go to last post
  1. SEM - model fit question

    Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

    Started by Anabela‎, 03-09-2011 02:54 PM
    • Replies: 2
    • Views: 2,851
    03-31-2011, 10:49 AM Go to last post
  2. Grade (A, A-, B+, B, B-....)

    Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

    Started by studentdoctor‎, 03-16-2011 12:55 PM
    • Replies: 2
    • Views: 3,190
    04-11-2011, 06:32 AM Go to last post
  3. Bootstrapping Dependent Data

    Is there any bootstrapping procedure for dependent data which is not based on any specific model?

    Started by tsukiko‎, 03-16-2011 07:49 PM
    • Replies: 2
    • Views: 2,181
    03-16-2011, 10:03 PM Go to last post
  4. 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: 4,850
    03-29-2011, 09:09 PM Go to last post
  5. Please give me feedback on my study proposal!

    Greetings, I work for a small software company, and we will be performing a statistical experiment on the effectiveness of a mobile learning...

    Started by FreddyZ‎, 03-22-2011 04:08 PM
    • Replies: 2
    • Views: 4,292
    03-23-2011, 11:20 AM Go to last post
  6. ?is there a test for this?

    I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

    Started by Justin Gundara‎, 03-24-2011 07:35 AM
    • Replies: 2
    • Views: 2,103
    03-28-2011, 08:45 PM Go to last post
  7. How to test the P-value in this type of situation

    Hi all, this is my first post on the forum... I apologize in advance, this explanation might be a little long...please let me know if anything is...

    Started by joeyb313‎, 03-25-2011 03:42 PM
    • Replies: 2
    • Views: 2,388
    03-25-2011, 04:42 PM Go to last post
  8. Need some help choosing correct statistical method for study

    Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

    Started by rwws22‎, 03-26-2011 10:09 PM
    • Replies: 2
    • Views: 4,672
    03-27-2011, 02:56 AM Go to last post
  9. Survival Analysis with non 0 start time

    I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

    Started by johank‎, 03-28-2011 05:04 PM
    • Replies: 2
    • Views: 4,415
    03-28-2011, 07:11 PM Go to last post
  10. Questions about approach

    Hi, I am working with a large data set with all categorical variables except for age, which I will want to group in to age bands. I think I am...

    Started by Byrnethau‎, 03-29-2011 01:45 PM
    different chisq tests
    • Replies: 2
    • Views: 2,330
    03-29-2011, 09:23 PM Go to last post
  11. Finding SD given mean and n

    I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

    Started by trinker‎, 04-04-2011 10:59 PM
    • Replies: 2
    • Views: 4,132
    04-04-2011, 11:53 PM Go to last post
  12. Question What tests should I use to analyze my data? Immediate input appreciated

    Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

    Started by IDmedicine‎, 04-10-2011 03:48 PM
    unequal sample size, wilcoxon
    • Replies: 2
    • Views: 4,267
    04-10-2011, 07:13 PM Go to last post
  13. Statistical test for two Maxwell-Boltzmann distributions

    Suppose we have two processes A and B, and N subjects, x_i. A(x) is distributed as a Maxwell-Boltzmann distribution with scale parameter alpha_a;...

    Started by xygorn‎, 04-12-2011 10:57 AM
    maxwell-boltzmann, scale parameter, statistical test
    • Replies: 2
    • Views: 3,602
    04-12-2011, 01:10 PM Go to last post
  14. Understanding ANOVA requirements better.

    Two ANOVA requirements are 1. Approximately Normal Data 2. Equal Variances Online the normality requirement is often simply stated as the...

    Started by wwreith‎, 04-15-2011 01:34 PM
    • Replies: 2
    • Views: 17,077
    04-17-2011, 07:04 PM Go to last post
  15. Please help!

    Hi, I am doing a project at university dealing with some new experimental data that I could use a few hints on to get started. The data is for...

    Started by Lugz McPie‎, 04-22-2011 11:54 AM
    • Replies: 2
    • Views: 2,125
    04-22-2011, 07:49 PM Go to last post
  16. Question At Wits End

    Hi, I am doing a research report as a requirement for the course I am doing. Professor provided us with data and it's up to us to establish a...

    Started by statnewbie‎, 04-22-2011 11:45 PM
    • Replies: 2
    • Views: 2,095
    04-23-2011, 01:28 AM Go to last post
  17. Help with deciding upon a test

    Usually I'm pretty good with figuring out what test to use but this has me puzzled: I'm more familiar with the ANOVA camp than the regression camp...

    Started by trinker‎, 04-25-2011 10:32 PM
    • Replies: 2
    • Views: 1,613
    04-26-2011, 12:13 AM Go to last post
  18. please help- getting desperate

    Hi I am doing a masters in health and need to analyse data I have. I basically have 2 groups, 1 group immunised (2500) and one group not (1000). I...

    Started by mels‎, 04-27-2011 11:31 AM
    • Replies: 2
    • Views: 2,364
    04-28-2011, 01:48 PM Go to last post
  19. non-parametric equivalent for mixed-factorial design

    I have to analyze my confidence data which is measured using a likert scale (1 7). Because its ordinal in nature, I need to use non-parametric...

    Started by gradstudent87‎, 04-27-2011 04:12 PM
    • Replies: 2
    • Views: 3,639
    04-27-2011, 11:13 PM Go to last post
  20. Testing assumptions

    Hi, I would greatly appreciate it if some-one would point me in the right direction. I have to critique the statistical methods used in a few...

    Started by Mac2‎, 04-28-2011 01:40 PM
    • Replies: 2
    • Views: 2,324
    04-29-2011, 08:12 AM Go to last post
  21. Thumbs up Significance in a Yes/No question

    Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

    Started by airwee‎, 04-30-2011 03:45 PM
    • Replies: 2
    • Views: 5,732
    06-22-2011, 02:01 PM Go to last post
  22. Negative Cronbach !

    Can anyone help me, I am having a negative cronbach value.. Does it mean my data is unreliable? I have a set of 10 questions with likert scale...

    Started by gizmo00‎, 05-09-2011 01:17 PM
    • Replies: 2
    • Views: 2,226
    05-09-2011, 05:03 PM Go to last post
  23. Red face How to calculate the Margin of Error for 3 candidates?

    I know how to figure out the Margin of Error for 2 candidates, e.g. @ http://fisher.utstat.toronto.edu/reid/sci199y/oct8/oct8.html But, how to...

    Started by Learning2011‎, 05-14-2011 09:18 PM
    • Replies: 2
    • Views: 2,560
    06-13-2011, 03:03 PM Go to last post
  24. Individual level moderator in HLM? Need help, please!

    Hi, I'm working on a paper about the influence of a group-level variable on a individual-level variable and want to add an individual-level...

    Started by stef‎, 05-25-2011 07:15 AM
    • Replies: 2
    • Views: 5,686
    06-29-2011, 07:23 AM Go to last post
  25. Help needed with Multiple Correspondence Analysis

    Greetings, I am looking for resources (books, websites, articles) that can help me, in the simplest way possible (i.e. step by step), figure out...

    Started by rhazlettknudsen‎, 07-05-2011 04:08 PM
    • Replies: 2
    • Views: 3,906
    07-05-2011, 06:54 PM Go to last post
  26. Tests for Comparing AUCs for Significant Increases

    I'm currently working on a project aimed at improving some of my program's risk assessment tools. We generally use AUCs to evaluate performance of...

    Started by PsychResearcherRASIS‎, 07-06-2011 11:41 PM
    • Replies: 2
    • Views: 4,474
    07-07-2011, 06:17 AM Go to last post
  27. Which independent variables for availability of water resources?

    Apologies, this is not really a stat question. I was wondering whether you guys had any ideas on which variables to use as explanatory variables for...

    Started by Sylviastat‎, 07-09-2011 05:16 PM
    • Replies: 2
    • Views: 2,454
    07-10-2011, 08:31 PM Go to last post
  28. Time: Ordinal and/or continous?

    I am analyzing a storage study with time points, 34, 68, 102, and 200 days. I also have another variable to consider, which is nominal. I have...

    Started by Lou999‎, 07-11-2011 05:00 PM
    • Replies: 2
    • Views: 2,533
    07-13-2011, 12:15 AM Go to last post
  29. Several distributions -how to choose between parametric/nonparametric test

    Hello all! I have 56 distributions and I'm trying to decide whether to use parametric or nonparametric test (only one for all). I used Lilliefors...

    Started by Tikkuhirvio‎, 07-14-2011 05:55 AM
    • Replies: 2
    • Views: 3,047
    07-15-2011, 07:18 AM Go to last post
  30. Research Help!

    Hi, For my Masters I've captured sales performance and preference for 5 leadership styles. Each style has a rank 1-10 for preference, and there is no...

    Started by james1010‎, 07-14-2011 11:44 AM
    • Replies: 2
    • Views: 1,711
    07-16-2011, 05:43 AM Go to last post
  31. which distribution fits...

    Hi I am working on some data describing people arrival at the bus station. For example 08.00-08.10 at the station arrived 9 people/min...

    Started by endri81‎, 07-15-2011 10:26 AM
    • Replies: 2
    • Views: 1,704
    07-15-2011, 11:06 AM Go to last post
  32. Smile Two independent, non-metric categorical variables: which test to use?

    :)Hello! I am new to this forum so first I would like to say hi to everybody and already thank you in advance for your kindness to help me on my...

    Started by Virenque‎, 07-19-2011 03:34 AM
    • Replies: 2
    • Views: 12,297
    07-19-2011, 08:50 AM Go to last post
  33. What kind of statistical analysis to use?!?!

    I am a grad student working on a research project and I'm not sure what kind of tests to run in SPSS. I have a set of test scores and a set of 4...

    Started by cgrif21‎, 07-20-2011 07:00 PM
    • Replies: 2
    • Views: 1,800
    07-21-2011, 12:54 PM Go to last post
  34. Appropriate Method for Researching the Motives behind a Decision

    Hello, I am interested in studying the motives behind a particular decision. This would be a onfirmatory study. According to the theory I will...

    Started by Sta‎, 07-24-2011 12:33 AM
    • Replies: 2
    • Views: 2,237
    07-30-2011, 03:22 AM Go to last post
  35. Cool comparing percentage when without knowing n? what test?

    I'm trying to do a meta analysis of some poll results and though I know the sample size in general, if I'm comparing the reported results and they...

    Started by rokkid‎, 07-25-2011 10:51 AM
    comparing percentages, missing data, proportions
    • Replies: 2
    • Views: 1,708
    07-25-2011, 06:15 PM Go to last post
  36. Sampling error & meaning of level of significance (AKA alpha)

    My understanding of alpha the level of significance is that in a large number of hypothesis tests the null will be rejected percentage alpha times...

    Started by PeterVincent‎, 07-26-2011 05:59 AM
    • Replies: 2
    • Views: 3,344
    07-28-2011, 05:10 AM Go to last post
  37. Paired t test or repeated anova

    I have a two groups design (treatment vs control) and pre and post test. I've looked at a paired t-test to see if there was a difference, and...

    Started by proprioceptivo‎, 08-02-2011 07:54 PM
    psychology
    • Replies: 2
    • Views: 5,676
    08-02-2011, 08:09 PM Go to last post
  38. data simulation help

    Hi all, How do I generate count data from a gamma distribution, preferably using SAS? For example, I assume that frequency of persons born in...

    Started by manoa‎, 08-05-2011 08:48 PM
    • Replies: 2
    • Views: 1,937
    08-05-2011, 09:45 PM Go to last post
  39. Accelerated Bootstrap - mediation

    Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

    Started by danony‎, 08-20-2011 05:01 AM
    • Replies: 2
    • Views: 5,019
    08-20-2011, 04:15 PM Go to last post
  40. Graduates grades- how to standardize by subject?

    Hello! This is probably rather basic, but I'd appreciate any input. The sample: I have survey responses from a sample of about 4000 German...

    Started by siskin‎, 08-23-2011 07:43 AM
    • Replies: 2
    • Views: 2,318
    08-30-2011, 03:00 AM Go to last post
  41. Request for help on deciding how to analyse some data

    I have a group of students who have data for % Attendance before and % Attendance after These students can be split by various factors, depending...

    Started by gdmorgan‎, 08-25-2011 10:33 AM
    • Replies: 2
    • Views: 2,162
    08-30-2011, 03:02 AM Go to last post
  42. Repeated measure ANOVA shows a significant difference but not post-hoc analysis

    Hi, I am kind of new to statistics and I did a comparison that I can't really digest its results. My participants rated the usefulness of 7...

    Started by peejay‎, 08-29-2011 01:35 PM
    • Replies: 2
    • Views: 7,553
    08-29-2011, 04:08 PM Go to last post
  43. single Likert scale question analysis

    I work for a holiday company which uses a 7 grade Likert scale questionnaire to collect feedback from our guests. This is my first foray into...

    Started by Percepto‎, 09-02-2011 05:41 PM
    analysis, average., evaluate, likert, ordinal
    • Replies: 2
    • Views: 3,755
    09-08-2011, 03:57 AM Go to last post
  44. Bayesian Variable Transformation (solve for PDF)

    Hi I'm struggling with where to start for this variable transformation problem. X~Bin(N,p) so that p(X=x) = (N choose x) * (p^x) * (1-p)^(N-x) ...

    Started by Dwaffle‎, 09-13-2011 08:59 PM
    • Replies: 2
    • Views: 2,188
    09-14-2011, 06:11 PM Go to last post
  45. Post regression time series

    Dear Members, I need to do time series analysis. I have retail sales data of a retail company since January 2006(every month). I need to forecast...

    Started by masarimk‎, 09-09-2011 02:21 AM
    forecasting, regression analysis, time series
    • Replies: 2
    • Views: 2,178
    09-12-2011, 10:00 PM Go to last post
  46. multiple levels of indepenent variable

    I have three x variables (a,b,c) and b is nested in a and c is nested in b. As you can imagine, there are over 100 levels of c and about 25 levels...

    Started by shanehall.m‎, 09-12-2011 02:34 PM
    • Replies: 2
    • Views: 2,108
    09-14-2011, 02:56 PM Go to last post
  47. How to calculate credibility interval limits

    Hi everyone. My name is Choi. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting...

    Started by aamssa‎, 09-14-2011 02:52 AM
    • Replies: 2
    • Views: 5,420
    09-14-2011, 09:32 PM Go to last post
  48. Classification

    Perhaps you can help me with a problem? I have a file which after a simple model classification which gives very lumpy results. ...

    Started by sverre.ardo@gmail.com‎, 09-29-2011 03:35 AM
    • Replies: 2
    • Views: 2,100
    10-07-2011, 10:43 AM Go to last post
  49. Adding random error to ordinal IV to make it more continous

    In survey data, attududinal questions are often coded 1-5, 1-7, 0-10 etc. These kinds of variables are often reffered to as approximately...

    Started by Ullsokk‎, 10-07-2011 03:30 AM
    • Replies: 2
    • Views: 2,703
    10-07-2011, 09:37 AM Go to last post
  50. canonical correlation and pseudoreplication

    Hello I have just joined Talk Stats and was hoping you all might be able to give me some advice. I have used a canonical correlation analysis...

    Started by mags‎, 10-20-2011 11:30 PM
    canonical correlation, pseudoreplication
    • Replies: 2
    • Views: 2,231
    11-13-2011, 11:00 PM Go to last post
  51. lessons of SPC and quality control

    hi, please could you share spc lessons :wave:

    Started by sihem‎, 10-12-2011 02:24 PM
    • Replies: 2
    • Views: 1,980
    10-13-2011, 10:24 AM Go to last post
  52. 95% ci

    Hi I am trying to interpret a journal article about the results of whether drinking cokes leads to child hyperactivity, the sample taken from a...

    Started by h974483‎, 10-22-2011 05:37 AM
    • Replies: 2
    • Views: 2,435
    10-24-2011, 08:25 AM Go to last post
  53. 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: 4,984
    11-06-2011, 06:24 PM Go to last post
  54. Outlier detection

    Hi all, I am looking for a way to detect outliers in data. I have a variable Y, which is of interest. In addition, I have a variable X that...

    Started by NN_STAT‎, 11-07-2011 10:05 AM
    • Replies: 2
    • Views: 2,168
    11-07-2011, 05:58 PM Go to last post
  55. 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: 5,183
    11-18-2011, 09:36 AM Go to last post
  56. using non-parametric test as robustness check

    hi all, I know the data are normally distributed (as indicated by Kolmogorov Smirnov). But when I use rank test to confirm hypothesis testing...

    Started by sampahmel‎, 11-18-2011 05:25 PM
    • Replies: 2
    • Views: 3,288
    11-18-2011, 06:20 PM Go to last post
  57. Comparing Correlation's Effect Size, Significance between Two Populations

    Hi, All! I have variables describing students (N=340), both boys (N=160) and girls (N=180). I calculated Pearson's correlation (using SPSS) for...

    Started by jonesh‎, 11-21-2011 10:45 PM
    • Replies: 2
    • Views: 2,266
    11-22-2011, 08:13 AM Go to last post
  58. Where to start?

    I am trying to find the best way to identify the optimal quantity for packaging that reduces handling of product. example: Product 1 ...

    Started by JHallagin‎, 11-30-2011 02:41 PM
    • Replies: 2
    • Views: 1,450
    11-30-2011, 03:17 PM Go to last post
  59. Confronting two tests

    Hi A group of people have taken a test with 3 possible answers. Then they underwent therapy. Finally, the took the same test again (with the 3...

    Started by roailman‎, 12-15-2011 11:50 AM
    • Replies: 2
    • Views: 1,403
    12-15-2011, 12:19 PM Go to last post
  60. A method to estimate linear regression coefficients when some data is missing

    Is there a method to estimate linear regression coefficients when some data is missing, without deleting the records are missing? I know that This...

    Started by Michael123‎, 12-23-2011 10:19 AM
    • Replies: 2
    • Views: 1,755
    12-23-2011, 12:27 PM Go to last post

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