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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: 18,626
    10-11-2014, 12:02 PM Go to last post
  1. whether opinion differes among respondents from different group

    I want to test whether response differ among groups regarding e-government interoperability. There are 14 itens regarding interoperability (Likert...

    Started by dibakar‎, 01-17-2011 02:41 AM
    • Replies: 1
    • Views: 2,259
    02-16-2011, 03:26 AM Go to last post
  2. 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: 2,458
    01-19-2011, 05:19 AM Go to last post
  3. Taguchi designs

    Dear TalkStats Forum, I am using Taguchi design in my experiments. I have a presentation soon and I want to explain this design in a very dynamic...

    Started by diegorg‎, 03-26-2015 12:09 PM
    • Replies: 1
    • Views: 1,395
    03-26-2015, 03:31 PM Go to last post
  4. Two way Anova+post hoc tests plz help

    I have three treatment groups I II &III, i tested rate of wound healing in the three gps vs several variables using the two way anova ,gender...

    Started by Dina‎, 12-29-2012 03:44 AM
    • Replies: 0
    • Views: 2,183
    12-29-2012, 03:44 AM Go to last post
  5. Smile How to combine Probability Distribution Function of Two correlated variables?

    I have the probability distribution Functions(PDF) of the wind speeds of two wind sites which have a certain Pearson's correlation coefficient. How...

    Started by dinesh‎, 06-04-2012 05:21 PM
    convolution, correlation, dependent, probability distributions, regression
    • Replies: 0
    • Views: 2,737
    06-04-2012, 05:21 PM Go to last post
  6. Repeated measures, cross-sectional data check

    Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

    Started by dinnuk‎, 05-27-2017 05:09 AM
    • Replies: 0
    • Views: 665
    05-27-2017, 05:09 AM Go to last post
  7. Repeated measures, cross-sectional data check

    Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

    Started by dinnuk‎, 05-27-2017 05:01 AM
    • Replies: 0
    • Views: 570
    05-27-2017, 05:01 AM Go to last post
  8. Smile [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

    Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

    Started by dippedinice‎, 05-12-2016 03:18 PM
    hypothesis testing, spss
    • Replies: 0
    • Views: 644
    05-12-2016, 03:18 PM Go to last post
  9. comparing two measurements over time

    I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

    Started by dirkheld‎, 08-22-2007 07:11 AM
    • Replies: 8
    • Views: 7,762
    08-27-2007, 04:38 AM Go to last post
  10. Distribution not normal

    Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

    Started by dissstat1‎, 04-08-2011 08:07 PM
    • Replies: 4
    • Views: 3,304
    04-11-2011, 05:29 PM Go to last post
  11. Can you estimate the power of a test by simulating data?

    I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

    Started by Disvengeance‎, 07-05-2013 05:48 PM
    • Replies: 6
    • Views: 1,633
    07-06-2013, 06:31 PM Go to last post
  12. 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: 8,460
    12-18-2014, 10:02 PM Go to last post
  13. Exclamation desperate for some help with a confidence interval question.

    please delete thread

    Started by djani‎, 04-30-2012 08:30 AM
    • Replies: 0
    • Views: 1,530
    04-30-2012, 08:30 AM Go to last post
  14. Omitted-variable bias in the constant of multiple regression under heteroskedasticity

    Good morning, I would like to have some deeper information about omitted-variable bias. Here is the real model: Callback = Constant + b1*Race +...

    Started by djayb6‎, 05-14-2013 02:04 PM
    bias, regression
    • Replies: 1
    • Views: 1,814
    05-14-2013, 02:26 PM Go to last post
  15. Question Help! Selection of statistical methods for experiment

    Hello everyone. I need help with the selection of statistical methods for one experiment. I'm a total newbie to the statistics :yup: So, I need to...

    Started by djomla‎, 11-07-2012 06:15 PM
    • Replies: 0
    • Views: 1,027
    11-07-2012, 06:15 PM Go to last post
  16. Regression Method

    I need to create a software algorithm to calculate cubic or quartic regression on an array of values, but it's been a while since my last stats...

    Started by djshusko‎, 06-13-2007 09:20 AM
    • Replies: 4
    • Views: 3,326
    06-15-2007, 01:34 PM Go to last post
  17. Name That Model!

    Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

    Started by dj_johnphillips‎, 08-04-2016 02:33 PM
    • Replies: 7
    • Views: 1,823
    08-05-2016, 04:22 PM Go to last post
  18. Mann-Whitney or independant T-test?

    Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

    Started by dkhamoo‎, 04-15-2011 10:56 AM
    • Replies: 3
    • Views: 4,289
    06-13-2011, 05:01 PM Go to last post
  19. help choosing LDA situation to implement

    Hey all, I am a comp sci grad student interested in pattern recognition, and have been told that LDA is a good place to start before moving into...

    Started by dkwestbr‎, 10-06-2008 01:00 AM
    • Replies: 0
    • Views: 2,409
    10-06-2008, 01:00 AM Go to last post
  20. how to obtain p-value from test statistic

    I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

    Started by dliner‎, 12-29-2016 03:26 PM
    mathematica, normality, statistics
    • Replies: 0
    • Views: 2,745
    12-29-2016, 03:26 PM Go to last post
  21. Help analyzing bird migration patterns?

    Hi. I am trying to analyze data I have on bird migration and am stuck on what I need to do. Basically, I have the maximum abundance of birds seen...

    Started by dlk2143‎, 01-29-2014 09:50 AM
    birds, compare, ecology, migration, trend analysis
    • Replies: 0
    • Views: 803
    01-29-2014, 09:50 AM Go to last post
  22. Pre/Post-Survey Methodology Question

    I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

    Started by DLU‎, 01-04-2012 12:34 PM
    • Replies: 5
    • Views: 13,112
    01-06-2012, 06:35 AM Go to last post
  23. Mediation results where MV and IV become insignificant

    I have been running some mediation models and have come across a finding where individually the IndVar-DepVar and Mediator-DepVar relationships are...

    Started by dmcintyre‎, 02-26-2013 06:42 PM
    interpretation, mediation analysis, results
    • Replies: 0
    • Views: 1,650
    02-26-2013, 06:42 PM Go to last post
  24. Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

    Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

    Started by dmorga‎, 01-15-2015 03:13 AM
    sem, z-scores
    • Replies: 4
    • Views: 4,603
    01-15-2015, 11:27 AM Go to last post
  25. random assignment

    does anyone know what is a random assignment in a true experiment. Thanks

    Started by dnice06‎, 05-12-2011 01:21 AM
    • Replies: 1
    • Views: 1,658
    05-13-2011, 01:06 AM Go to last post
  26. ANOVA and Tukey comparisions

    Hi! I'm using Minitab to run ANOVAs for a recent psycholinguistic experiment. My problem is that some interactions aren't even close to significant...

    Started by dochamer‎, 08-16-2014 05:21 PM
    • Replies: 0
    • Views: 1,098
    08-16-2014, 05:21 PM Go to last post
  27. Cohort

    Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

    Started by dockiss‎, 11-16-2011 09:51 AM
    • Replies: 4
    • Views: 3,031
    11-18-2011, 01:04 PM Go to last post
  28. Mortality Statistics help

    My prof gave me a hospital mortality data to analysis but i can not think of any things else apart from crude mortality rate. Data set contains the...

    Started by dockiss‎, 02-07-2012 02:00 PM
    • Replies: 9
    • Views: 2,188
    02-10-2012, 06:23 AM Go to last post
  29. Multiple Comparison Correction - Help needed !

    I know the concept that one should have statistical correction if multiple comparison are made between means. Such as the well-known bonferroni...

    Started by doctor‎, 11-02-2008 11:04 AM
    • Replies: 1
    • Views: 4,014
    08-20-2009, 09:42 AM Go to last post
  30. Time series analysis to test a system:This seems too simple. Have I missed something?

    I wish to test whether or not Performance Measurement Frameworks (PMFs) may be influencing future values of the variable being monitored. I may be...

    Started by DoctorG‎, 01-26-2012 05:44 PM
    autocorrelation function, feedback, systems, time series analysis
    • Replies: 0
    • Views: 1,201
    01-26-2012, 05:44 PM Go to last post
  31. Permanova design for BACI study (using Primer)

    my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

    Started by doddel‎, 08-01-2013 08:25 AM
    • Replies: 5
    • Views: 3,150
    08-09-2013, 03:51 AM Go to last post
  32. panel data correlation

    I am working on paneldata (xtset firm date). Before starting my regression analyses, I want to construct a Pearson Correlation Matrix between the...

    Started by Dokla‎, 09-25-2014 04:48 AM
    • Replies: 0
    • Views: 1,645
    09-25-2014, 04:48 AM Go to last post
  33. Interpretation of Autocorrelation

    Hi, I have a question regarding the autocorrelation of time series. In my computation (using a software package) the first coefficient yields...

    Started by Dolphin72‎, 11-10-2012 01:08 AM
    • Replies: 0
    • Views: 2,062
    11-10-2012, 01:08 AM Go to last post
  34. Deck of cards: Odds of being dealt 3 of a suit?

    I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

    Started by domino‎, 09-15-2008 03:31 AM
    • Replies: 2
    • Views: 8,506
    09-15-2008, 09:46 AM Go to last post
  35. composite variables

    Dear users, I have a question regarding the calculation of a composite variable out of 5 individual variables which I want to use in a MANOVA...

    Started by DonJ‎, 05-03-2014 12:02 PM
    • Replies: 1
    • Views: 1,202
    05-03-2014, 03:55 PM Go to last post
  36. I have no idea where to start!!

    I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

    Started by donkey1702‎, 07-30-2009 12:08 AM
    • Replies: 2
    • Views: 2,415
    08-05-2009, 05:36 PM Go to last post
  37. Violation?: Comparing group mean to population mean

    Greetings! I was hoping you guys could help me out with a problem. Im curious to know how one would go about attacking a problem like this. I...

    Started by Doodnauth‎, 11-09-2012 08:42 AM
    • Replies: 0
    • Views: 3,416
    11-09-2012, 08:42 AM Go to last post
  38. Looking at differences. Having Groups within Groups. Please help!

    Hi all My data is as follows: I have seedling height divided <10 cm and >10cm I collected data across a glacier foreland using square plots. Each...

    Started by dora1530‎, 01-12-2014 04:42 PM
    • Replies: 0
    • Views: 788
    01-12-2014, 04:42 PM Go to last post
  39. Suggestions for Statistical Methods for Health Research

    I am currently planning a research project looking at a scoring system for patients (using demographics, social circumstances) to determine whether...

    Started by dornsapothecary‎, 01-18-2014 11:59 AM
    anova, health research, logisitic regression, statistical design, statistical help
    • Replies: 0
    • Views: 880
    01-18-2014, 11:59 AM Go to last post
  40. Discriminant analysis with mostly incomplete cases

    Hello. I have a bit of a biostats problem. Ive got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

    Started by Dorquemada‎, 01-29-2009 07:01 PM
    • Replies: 6
    • Views: 2,888
    03-02-2009, 12:52 AM Go to last post
  41. Statistical test for comparing sensor data from different groups?

    Hello there, Sorry I am new to this forum, but I hope you guys will try to help me nevertheless ;) Pardon my not-so-perfect English, too, I will try...

    Started by doszika‎, 09-10-2013 10:01 AM
    • Replies: 0
    • Views: 942
    09-10-2013, 10:01 AM Go to last post
  42. Post General method for data analysis

    Dear community, maybe you can help me. I have a lots of data like this format: Person/points/work/power/sex Person1/75/10/120/m...

    Started by Dotana‎, 11-11-2013 08:52 AM
    • Replies: 3
    • Views: 1,327
    11-14-2013, 10:32 AM Go to last post
  43. Please help: Need a method to compare rankings over different circuits

    Hello, I do not have a background in statistics. I need help finding a methodology to compare the performance of a given set of items under...

    Started by doubidou‎, 02-22-2011 05:07 PM
    • Replies: 0
    • Views: 2,137
    02-22-2011, 05:07 PM Go to last post
  44. Help on which test to choose for paired samples?

    Hi there - I'm hoping to elicit help on which test to choose - Mann-Whitney vs Wilcoxin (signed rank or rank-sum)? I have paired water samples...

    Started by dougherl‎, 06-02-2015 08:31 PM
    • Replies: 2
    • Views: 1,137
    06-03-2015, 07:33 AM Go to last post
  45. Sample Size Help

    I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

    Started by dougla‎, 01-19-2012 04:50 PM
    • Replies: 4
    • Views: 1,824
    01-24-2012, 12:24 PM Go to last post
  46. Wink One Sample T-Test

    For an exercise is received speed measurements on two road points. The cars drove along an urban road (30mph) that opened into a rural road (60mph)....

    Started by Downburstx‎, 01-04-2012 05:41 AM
    normal distributed, one sample, t-test
    • Replies: 9
    • Views: 2,366
    01-08-2012, 02:06 PM Go to last post
  47. Meta-Analysis or alternative method?

    I am carrying out a systematic review on conservative (physiotherapy) treatment in comparison to surgical treatment. I have recorded the return to...

    Started by dpbyrne‎, 08-21-2013 04:49 AM
    • Replies: 4
    • Views: 1,994
    08-21-2013, 11:24 AM Go to last post
  48. Scaling technique

    A friend of mine, a Ph.D. student, seeks my advice on the appropriate scaling technique that can be used for his research. The research involves...

    Started by Dr.Appalayya‎, 03-25-2009 04:10 AM
    • Replies: 0
    • Views: 3,757
    03-25-2009, 04:10 AM Go to last post
  49. Relationship between foods consumed and diseases developed

    What kind of data can we collect to find out the relationship between foods consumed and diseases developed? If a patient says he is a vegetarian...

    Started by Dr.Appalayya‎, 12-01-2009 11:55 PM
    • Replies: 0
    • Views: 2,208
    12-01-2009, 11:55 PM Go to last post
  50. how to measure love/hate

    Any idea about how can one develop a scale (Likert) to measure concepts like love, liking, hate etc towards some prominent leaders from certain...

    Started by Dr.Appalayya‎, 01-22-2010 01:02 AM
    • Replies: 4
    • Views: 5,575
    04-13-2010, 01:27 PM Go to last post
  51. 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: 3,611
    04-10-2010, 10:15 AM Go to last post
  52. Statistical tests for the analysis of acoustic parameters of one speaker

    Hello! I would like to address the question regarding the statistics. I am analyzing the relation between the narrow focus and fundamental...

    Started by draganvarajic‎, 08-26-2015 05:38 AM
    • Replies: 0
    • Views: 892
    08-26-2015, 05:38 AM Go to last post
  53. Sample size calculation

    I have a normal distribution: log(xi/yi) ~N (0, c^2/yi). I need to work on the posterior distribution of c^2. I know c^2 follows a gamma...

    Started by drala54@yahoo.com‎, 06-29-2017 02:35 PM
    gamma distribution, sample size calculation
    • Replies: 1
    • Views: 333
    07-07-2017, 12:19 PM Go to last post
  54. non-parametric 1-way anova, but samples not independent

    Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

    Started by DrCJones‎, 09-07-2010 01:51 AM
    • Replies: 1
    • Views: 4,230
    09-07-2010, 07:27 AM Go to last post
  55. Choice of analysis method and variable skew

    Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

    Started by DrDogg‎, 02-13-2012 05:18 PM
    • Replies: 2
    • Views: 1,934
    02-14-2012, 02:30 PM Go to last post
  56. What is the best way to treat Autocorrelation and Heteroscedasticity problems in TS

    Hi, I am doing time-series regression. I face the problems of Heteroscedasticity and Autocorrelation as following. ...

    Started by dreamer3930‎, 08-14-2012 05:15 AM
    • Replies: 0
    • Views: 1,781
    08-14-2012, 05:15 AM Go to last post
  57. T-Test: How large is large?

    I'm doing some research, I collected data from two different groups, 80 samples in each group. The data is borderline for normality. I've read on...

    Started by drekhan‎, 12-17-2009 04:24 PM
    • Replies: 1
    • Views: 4,948
    12-18-2009, 03:14 AM Go to last post
  58. Smile DF and fishers vs. pearson's

    Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

    Started by drewmac‎, 08-28-2011 07:38 PM
    binomial, chi, degrees of freedom, fisher, pearson
    • Replies: 3
    • Views: 2,552
    08-29-2011, 12:04 PM Go to last post
  59. Power calculation for accuracy tests

    Excuse my ignorance I would like to do a simple study. I have 3 screening tests and a gold standard test which will put patients into +ve and -ve...

    Started by drflett‎, 08-07-2015 06:44 AM
    • Replies: 2
    • Views: 1,387
    08-10-2015, 02:41 PM Go to last post
  60. Question on what statistics I should use

    Hello all, I have data from a survey of ex-prisoners. I want to look at the effect of victimization (victimized or not: dichotomous) on...

    Started by drforensicpsychologist‎, 08-25-2012 07:07 PM
    • Replies: 1
    • Views: 1,075
    08-27-2012, 03:49 AM Go to last post

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