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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: 18,747
    10-11-2014, 12:02 PM Go to last post
  1. Minimum sample size for calculation of guttamns lower bounds?

    Hi there, I am in the process of assessing the internal consistency of two tests, test A & B. Both tests are measuring the same thing so I am...

    Started by BOAZ‎, 10-11-2011 06:31 AM
    conbach's alpha, guttman's lower bounds, internal consistency, reliability, split half
    • Replies: 3
    • Views: 4,632
    10-11-2011, 07:37 PM Go to last post
  2. Independent t test - small sample size - use all data points?

    Hi there, I am running a small study in which both treatment (n = 7) and control groups (n= 6) have undertaken the same 48 item rating scale task...

    Started by BOAZ‎, 12-28-2011 08:34 PM
    data points, independent t test, small sample size
    • Replies: 1
    • Views: 3,087
    12-29-2011, 05:40 AM Go to last post
  3. Question [SOLVED] Option for post-hoc test after permanova for community data?

    Hi there, Thank you for reading my post and hopefully someone can provide me with some help! For my master's thesis, I have used microbial...

    Started by Bob3‎, 02-15-2016 07:21 AM
    community, permanova, post-hoc
    • Replies: 3
    • Views: 3,884
    02-24-2016, 08:58 PM Go to last post
  4. reduced-form system

    Hi, I am buiding a supply and demand model. I have one price and one demand equation and would like to compare the different coeffecients through...

    Started by bodesmiller‎, 04-18-2015 12:31 PM
    • Replies: 2
    • Views: 1,266
    04-19-2015, 10:11 AM Go to last post
  5. 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: 3,384
    11-20-2010, 10:20 AM Go to last post
  6. t-test or Mann-Whitney test, regular research problem, need help

    Hello, it looks like a most frequent research problem, but I am confused, so need help. I have 2 groups of data to compare: group 1 - people...

    Started by bondsergey‎, 10-08-2012 08:30 AM
    • Replies: 6
    • Views: 12,014
    10-09-2012, 06:01 AM Go to last post
  7. How to find minimal sample size in my case to compare means of 2 groups by t-test?

    Hello, please help. I have 2 groups of people (treated with a drug and untreated). I measure percentage of green cells among particular type of...

    Started by bondsergey‎, 10-20-2012 05:57 PM
    • Replies: 4
    • Views: 1,959
    10-25-2012, 06:03 AM Go to last post
  8. 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: 2,004
    10-30-2012, 05:54 PM Go to last post
  9. Comparing time curves for two groups in research.

    Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

    Started by bondsergey‎, 07-25-2014 08:27 AM
    statistical research
    • Replies: 3
    • Views: 1,729
    07-25-2014, 11:45 AM Go to last post
  10. normalization for detection of outliers

    Hello everyone, I am working with a huge dataset and I'm trying to find outliers in each row for two subgroups of my dataset (G1 and G2)....

    Started by bontus‎, 10-20-2011 08:59 AM
    • Replies: 0
    • Views: 3,942
    10-20-2011, 08:59 AM Go to last post
  11. Transform data for outlier analysis?

    Hey everyone, I have a data set which is log normally distributed and want to detect outliers, so far I used a threshold approach: vector...

    Started by bontus‎, 11-09-2011 11:59 AM
    outlier, transform
    • Replies: 10
    • Views: 7,757
    11-10-2011, 05:37 AM Go to last post
  12. Two-dimensional outlier detection

    Hi all, I was wondering if you could give me some suggestions to detect two-dimensional outliers, i.e. for values depending on the variables. A...

    Started by bontus‎, 01-19-2012 10:39 AM
    outlier detection, two-dimensional
    • Replies: 1
    • Views: 3,424
    01-19-2012, 01:06 PM Go to last post
  13. Weighted values from correlation coefficients

    I've been pressed to find a similar existing example of what I'm trying to do, but maybe i'm not phrasing it incorrectly. Essentially, I want to...

    Started by booptop‎, 07-19-2017 01:35 PM
    correlation coefficient, formula, weighted
    • Replies: 0
    • Views: 313
    07-19-2017, 01:35 PM Go to last post
  14. Low porbability from logistic regression

    Hi, I am facing a situation where I have very low probabilities (ave ~0.0008) after I performed the logistic regression. My original data...

    Started by boredaxel‎, 02-09-2013 01:38 AM
    • Replies: 0
    • Views: 1,538
    02-09-2013, 01:38 AM Go to last post
  15. Rarefaction and species richness

    Hi all! First of all thank you to take a look to my question, I hope this is the right subforum and I hope to explain it right! I have a...

    Started by borinot‎, 08-04-2013 12:51 PM
    • Replies: 0
    • Views: 2,241
    08-04-2013, 12:51 PM Go to last post
  16. Colculation Geometric Brownian Motion with deposits.

    Hi all. There is a way of colculation a future standart diviation of a portfolio if you know the daily standart diviation and the mean. ...

    Started by borislivs‎, 12-20-2014 03:00 PM
    • Replies: 1
    • Views: 1,722
    12-20-2014, 04:15 PM Go to last post
  17. determining sample size

    Hello everyone, i hope that someone can help me. i'm doing an experiment at my work place. i have 4 vehicles that need to go through the same...

    Started by boris_sht‎, 11-13-2011 07:39 AM
    • Replies: 1
    • Views: 1,838
    11-13-2011, 05:06 PM Go to last post
  18. Unhappy MBE, RMSE of two series of data, correlation.

    I have a series of Data generated as output of a mathematical model which I already know the MBE and RMSE (real measured values and simulated ones by...

    Started by bpivotto‎, 10-10-2014 07:10 AM
    correlation analysis, mbe, rmse
    • Replies: 1
    • Views: 3,286
    10-10-2014, 07:10 AM Go to last post
  19. multivariate statistics in Izhikevich model

    I have a simple cortical brain simulation model that has an output parameter and various input parameters. The output is the correlation coefficient...

    Started by brad henrie‎, 10-08-2009 08:17 PM
    • Replies: 0
    • Views: 1,901
    10-08-2009, 08:17 PM Go to last post
  20. Question Is this a good idea?

    I have a simple cortical brain simulation model that has an output parameter and various input parameters. The output is the correlation coefficient...

    Started by brad henrie‎, 10-08-2009 08:59 PM
    • Replies: 0
    • Views: 1,929
    10-08-2009, 08:59 PM Go to last post
  21. What is a monte carlo simulation?

    I am doing some research and think I am doing a monte carlo simulation. Could some body please tell me what that is? If someone could also tell me...

    Started by brad henrie‎, 10-22-2009 08:24 PM
    • Replies: 1
    • Views: 3,448
    10-22-2009, 08:53 PM Go to last post
  22. Post Probability from sample size

    I am working on taking a methodology class and when working on past exams I stumbled over this question. I used n=(z^2∗Var)/error^2 to obtain the...

    Started by brage‎, 05-30-2017 12:47 PM
    • Replies: 0
    • Views: 717
    05-30-2017, 12:47 PM Go to last post
  23. Which test to run (pretest-posttest)

    Hi there! What is the best test to use to analyze data involving a pretest and posttest given to two different treatment groups? Thanks!

    Started by Brandi‎, 02-10-2011 02:01 PM
    • Replies: 10
    • Views: 7,542
    02-11-2011, 10:46 PM Go to last post
  24. Correlation vs ANOVA

    Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

    Started by Bri‎, 01-23-2013 02:11 PM
    correlation analysis
    • Replies: 6
    • Views: 12,756
    01-23-2013, 04:18 PM Go to last post
  25. Multiple Paired t-tests

    Hi, I'm having a little bit of trouble with some research I'm doing and wondered if anyone could help. I'm looking at political decision-making....

    Started by brian_maddox‎, 01-24-2014 01:08 PM
    • Replies: 3
    • Views: 1,792
    01-28-2014, 03:50 PM Go to last post
  26. testing

    I am new to thread but wondering how I would go about testing inferentially a hypothesis for a research paper. It would be regarding productivity as...

    Started by brickwall‎, 02-09-2009 11:06 PM
    • Replies: 0
    • Views: 2,398
    02-09-2009, 11:06 PM Go to last post
  27. Are there any post hoc analyses for Chi Square data?

    Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

    Started by Brionny‎, 03-08-2009 06:03 PM
    • Replies: 2
    • Views: 5,700
    03-10-2009, 04:57 PM Go to last post
  28. Business location statistics.

    I'm interested in researching business statistics and possible factors involved which will determine a good business location. For example, If I am...

    Started by britishchick‎, 05-23-2015 04:11 AM
    • Replies: 0
    • Views: 1,171
    05-23-2015, 04:11 AM Go to last post
  29. Confidence Interval Question

    Let Y_n be the nth order statistic of a random sample of size n from a distribution that has pdf f(x) = (3x^2)/(t^3) with 0<x<t. a) Show that P(c...

    Started by BrownianMan‎, 11-14-2011 05:49 PM
    • Replies: 0
    • Views: 1,759
    11-14-2011, 05:49 PM Go to last post
  30. Limiting distribution of score variable

    Prove that \frac{1}{\sqrt{n}}\left (\sum_{i=1}^{n} \frac{\partial l(X_{i};\theta )}{\partial \theta } \right...

    Started by BrownianMan‎, 12-18-2011 02:10 PM
    • Replies: 3
    • Views: 1,621
    12-18-2011, 08:00 PM Go to last post
  31. Optimal tests of hypothesis

    I have a question about the use of optimal tests of hypothesis in practice. Are they often used in research or in industry? I understand that UMP...

    Started by BrownianMan‎, 04-26-2012 10:49 PM
    • Replies: 2
    • Views: 2,177
    04-28-2012, 12:06 AM Go to last post
  32. Ideas with paired data

    Yesterday I was lucky enough to work with a statistician from another section in my division. He took me along on one of the consultations he...

    Started by bryangoodrich‎, 08-31-2011 12:17 PM
    • Replies: 5
    • Views: 3,912
    08-31-2011, 04:45 PM Go to last post
  33. Age Adjusted Rates

    So I'm trying to make my data match, in some ways, those used by the CDC (NCHS, specifically). In particular, I need to calculate age-adjusted...

    Started by bryangoodrich‎, 09-13-2011 12:28 PM
    • Replies: 0
    • Views: 2,002
    09-13-2011, 12:28 PM Go to last post
  34. Error Analysis with Binned Data

    Our income data comes in increments of $5,000 from $15,000 onward. The [$0 to $15,000) is one way too big of a bin. In any case, we also have...

    Started by bryangoodrich‎, 12-07-2012 01:26 AM
    • Replies: 0
    • Views: 1,537
    12-07-2012, 01:26 AM Go to last post
  35. 1 way Anova vs Two Way Anova -HELP needed

    I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

    Started by BryRai‎, 01-03-2017 04:22 PM
    • Replies: 2
    • Views: 3,143
    01-05-2017, 09:06 AM Go to last post
  36. Right Sample Size

    I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

    Started by bsaikrishna‎, 11-03-2010 10:46 AM
    • Replies: 5
    • Views: 5,212
    11-04-2010, 12:12 PM Go to last post
  37. 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: 5,722
    12-08-2010, 12:54 AM Go to last post
  38. 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: 7,251
    12-27-2010, 05:00 AM Go to last post
  39. Interpretation of Factor Analysis

    I have a doubt on how to interpret the factor score output? Suppose we have data in 7 columns: Recommendation, Preference, Willingness to pay...

    Started by bsaikrishna‎, 01-30-2011 08:46 AM
    • Replies: 0
    • Views: 3,770
    01-30-2011, 08:46 AM Go to last post
  40. Research about stock comovements due to similar ticker symbols

    Dear all, I have a small question about a small research that I wanted to do regarding stock symbol similarities and their abnormal returns. I...

    Started by bsc.j.j.w‎, 04-24-2014 06:51 PM
    • Replies: 7
    • Views: 1,797
    04-26-2014, 07:31 PM Go to last post
  41. Sports Forecasting - a million iterations

    Hello, I am working on a forecasting project and would like to create a script that automates the following steps: order data by X characteristic...

    Started by bscully‎, 04-21-2012 10:18 AM
    forecasting, iteration, nfl, script, sports
    • Replies: 0
    • Views: 1,215
    04-21-2012, 10:18 AM Go to last post
  42. Can a convenience sample ever be considered truly cross-sectional?

    I'm having a debate over terminology with a colleague. We've done a small census survey (n<50) of residents and staff at a local out-patient clinic....

    Started by BSimon‎, 09-17-2013 07:41 AM
    cross-sectional, definition, design, survey
    • Replies: 4
    • Views: 7,507
    09-18-2013, 07:50 AM Go to last post
  43. Choosing Kruskal–Wallis test for group comparison with unequal sizes

    I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

    Started by btomatoe‎, 10-31-2012 01:14 AM
    • Replies: 2
    • Views: 28,080
    10-31-2012, 08:10 PM Go to last post
  44. data not normally distributed

    Hi, I had originally intended to use a mixed repeated measures anova to test my data, however unfortunately it is not normally distributed and so...

    Started by bubu‎, 08-04-2011 10:06 AM
    • Replies: 1
    • Views: 2,118
    08-04-2011, 10:19 AM Go to last post
  45. Testing for a change in mean in a time series

    Suppose I have m observations from a time series before some specified date, and n additional observations after that date. The mean of the time...

    Started by Buchuck‎, 03-05-2011 12:41 AM
    • Replies: 1
    • Views: 5,038
    03-05-2011, 09:35 AM Go to last post
  46. Z-scores with non-normal data

    Hi, I am reviewing someone's study in which they used z-scores to standardize and compare data. I see no mention of their test for normality and...

    Started by budgie81‎, 06-06-2013 07:35 AM
    normal distribution, transformation, z score
    • Replies: 1
    • Views: 5,187
    06-06-2013, 07:46 AM Go to last post
  47. Tensor product

    Hi in the context of a generalized additive model, can someone explain what is meant by a fully nested tensor product? In the R package mgcv,...

    Started by bugman‎, 06-22-2011 01:49 AM
    • Replies: 0
    • Views: 1,645
    06-22-2011, 01:49 AM Go to last post
  48. comparing models

    This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

    Started by bugman‎, 08-21-2015 12:14 AM
    • Replies: 7
    • Views: 2,350
    12-04-2015, 10:26 PM Go to last post
  49. Chi sqared test or fisher exact test?

    Hi, I am doind research on different treatments to a disease. I broke down the categories into different age groups, i.e. 5-10,11-15,16-20 etc. and...

    Started by bullethead05‎, 04-10-2012 04:35 PM
    • Replies: 4
    • Views: 2,247
    04-10-2012, 07:13 PM Go to last post
  50. negligible trend tests?

    Greetings, I'm looking for information on how to test for a "negligible" trend. Info such as links to websites, formula/equations, and other...

    Started by Burgs‎, 08-02-2008 04:18 PM
    • Replies: 4
    • Views: 2,874
    08-04-2008, 10:43 AM Go to last post
  51. 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: 4,154
    12-08-2010, 12:24 AM Go to last post
  52. 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: 14,449
    12-14-2010, 07:22 PM Go to last post
  53. Principle Components, Canonical Variate Analysis and Win-DAS

    I'm trying to follow some analysis procedures as presented in an applied microbilogy paper. The authors did a principle components analysis (PCA)...

    Started by bwwhite‎, 10-07-2013 03:17 PM
    • Replies: 0
    • Views: 1,338
    10-07-2013, 03:17 PM Go to last post
  54. 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: 2,335
    03-29-2011, 09:23 PM Go to last post
  55. DOE for Logistic Regression

    Hello- Does anyone have any references for DOE (especially multivariate testing / Taguchi) for binary response variables (analyzing with Logistic...

    Started by B_Miner‎, 08-28-2008 09:31 AM
    • Replies: 5
    • Views: 4,221
    08-28-2008, 11:18 AM Go to last post
  56. 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: 7,537
    09-30-2009, 11:23 AM Go to last post
  57. Percent From The Critical Value

    Afternoon, Here is one I haven't experienced before and haven't seen discussed: I have a series of goodness-of-fit tests using chi-square a few...

    Started by c4sadler‎, 06-20-2016 01:46 PM
    • Replies: 0
    • Views: 1,104
    06-20-2016, 01:46 PM Go to last post
  58. URGENT: Two-Way Anova or Regression

    Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

    Started by CA92‎, 01-24-2014 10:45 AM
    anova, assumptions, levene, levene's test, regression
    • Replies: 3
    • Views: 1,116
    01-24-2014, 01:47 PM Go to last post
  59. Variation of Mantel test?

    Hello. I am new to this forum but it looks like it will be a great reference! For my thesis I used Mantel tests to compare non-parametric...

    Started by caddyhair‎, 04-01-2014 07:01 PM
    group comparison, mantel test, matrices, non-parametric
    • Replies: 1
    • Views: 1,225
    04-02-2014, 12:27 AM Go to last post
  60. Cluster analysis

    Hi all! I am new here, and I need some help. I have done some cluster analysis (K-means), and got four groups, two of which are "high" and "low"....

    Started by Calliope‎, 11-04-2011 10:08 AM
    • Replies: 5
    • Views: 2,107
    11-12-2011, 10:34 AM Go to last post

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