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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: 19,398
    10-11-2014, 12:02 PM Go to last post
  1. Post-hoc power analysis

    I have analyzed data by performing a regression model in three steps - (a) two psychological independent variables, (b) adding a political...

    Started by Vasily_Kot‎, 07-19-2014 10:09 AM
    • Replies: 2
    • Views: 2,814
    07-24-2014, 11:03 AM Go to last post
  2. Assessing mediation with lagged predictors

    Hello dear forum members! I am seeking your comments/advises on the following question related to assessing mediation effects. Following the...

    Started by kiton‎, 10-21-2016 11:08 AM
    lagged effects, mediation analysis, methodology, sobel test
    • Replies: 1
    • Views: 2,807
    10-21-2016, 03:48 PM Go to last post
  3. Methods help: How to find significant differences between groups with ordinal data?

    In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

    Started by hrh2101‎, 10-20-2012 10:39 PM
    • Replies: 3
    • Views: 2,806
    10-26-2012, 11:32 AM Go to last post
  4. Sample size calculation

    Hi everyone, I'm a bit of a newbie here. I am trying to determine the appropriate sample size. I have a survey with several dozen questions, most...

    Started by aferim‎, 09-11-2013 04:47 PM
    • Replies: 2
    • Views: 2,804
    09-19-2013, 08:38 AM Go to last post
  5. 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: 2,800
    10-07-2011, 09:37 AM Go to last post
  6. Unbalanced sample size

    Hello I have a question... what can an unbalanced sample cause ? For example, I have 2 groups, and I want to either use a t-test, or some...

    Started by NN_STAT‎, 03-22-2012 10:18 AM
    • Replies: 1
    • Views: 2,798
    03-22-2012, 11:12 AM Go to last post
  7. Which test should I use?

    Working on a medicine research paper here, really hoping someone can help me out. I have a group of patients for which I have data relating to...

    Started by MastahRiz‎, 03-28-2011 10:32 PM
    • Replies: 5
    • Views: 2,796
    04-06-2011, 11:00 AM Go to last post
  8. different intercept with Multinomial vs Binomial Logistic?

    I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

    Started by chipsens‎, 09-06-2011 03:02 PM
    logistic regression
    • Replies: 0
    • Views: 2,793
    09-06-2011, 03:02 PM Go to last post
  9. What kind of ANOVA is good for this

    Hello, In my research i've collected death % for cell cultures. One variable was the treatment used (0,2,4,10,16 exposure). Another one was the...

    Started by Blakey85‎, 08-16-2014 03:22 PM
    • Replies: 3
    • Views: 2,790
    08-17-2014, 01:53 PM Go to last post
  10. Looking for a better answer, if there is one (Puzzle)

    I've worked out a solution to a problem, but I was wondering if there might be a better way to do this. I'm using a computer to calculate these...

    Started by Creamsteak‎, 10-03-2008 02:42 PM
    • Replies: 1
    • Views: 2,789
    10-04-2008, 11:24 AM Go to last post
  11. Sample size of US prison population....

    So, I'm doing research on economic background of people in US prisons and have to collect the data manually so I'm wondering how many I really need...

    Started by cms‎, 08-10-2013 01:11 PM
    • Replies: 3
    • Views: 2,788
    08-12-2013, 07:56 AM Go to last post
  12. Chi-squared test with yes/no data

    Hi I am having trouble working out how to do a chi-square test in minitab for purely yes no data. These are my only variables and I want to find...

    Started by VickyTreg‎, 03-05-2014 11:49 AM
    • Replies: 1
    • Views: 2,788
    03-05-2014, 11:56 AM Go to last post
  13. How to obtain standard deviation of replicate experiments?

    I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

    Started by FrenzyFire‎, 01-20-2017 03:40 AM
    • Replies: 0
    • Views: 2,788
    01-20-2017, 03:40 AM Go to last post
  14. "significance metrics" for hypothesis testing


    Started by p05‎, 08-02-2010 04:58 PM
    • Replies: 0
    • Views: 2,786
    08-02-2010, 04:58 PM Go to last post
  15. Conditional expectation

    Hi everyone, I've usually seen the conditional mean of X_n given X_1,X_2,.X_n-1 expressed as shown on p. 5 of: ...

    Started by CLP_PS‎, 06-06-2014 02:07 PM
    • Replies: 5
    • Views: 2,786
    06-10-2014, 12:37 AM Go to last post
  16. How to create sampling weights?

    Hi all, I'll go directly to the point, and then try to clarify: How do I create reliable weights for a sample, that take account of the number...

    Started by Olleolle‎, 10-23-2012 04:01 AM
    • Replies: 2
    • Views: 2,784
    10-23-2012, 09:21 AM Go to last post
  17. Bayesian model checking: a problem with Gelman's chi-squared test

    So, I foolishly tried to implement a test Gelman and his colleagues propose to determine whether observed data actually fits a model (Bayesian Data...

    Started by lostsoul‎, 09-09-2012 12:06 PM
    bayesian, gelman, model checking, test statistic
    • Replies: 2
    • Views: 2,782
    09-11-2012, 09:21 PM Go to last post
  18. Arrow My professor told me that a t-test wasn't the correct procedure to use in a report

    In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

    Started by jenclark242‎, 10-01-2010 03:13 PM
    • Replies: 2
    • Views: 2,779
    10-02-2010, 01:34 PM Go to last post
  19. Desperate urgent help

    Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

    Started by ruzbayhhi‎, 02-17-2009 07:00 AM
    • Replies: 3
    • Views: 2,778
    02-20-2009, 02:07 AM Go to last post
  20. Pharmacology Exp Help

    Hello. I have been volunteering at a lab and need help with Behavioral Analysis. My data points are activity (locomotion) "counts" of 10 min...

    Started by slammer922‎, 02-10-2011 12:44 PM
    • Replies: 5
    • Views: 2,778
    02-24-2011, 10:52 AM Go to last post
  21. Research topic for Stats Phd, working as Business Analytics Manager

    Dear all, I was a Phd student in Math/ISyE department. At the same time I am a Business Analytics Manager at a corporation. I've finished all...

    Started by StatPhd‎, 10-08-2013 10:04 PM
    corporation, phd topic, research for thesis
    • Replies: 1
    • Views: 2,778
    10-12-2013, 03:40 AM Go to last post
  22. 4 simultaneous non-independent measures should nested ANOVA work?

    Hi all, this is my first time posting here, but Im very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

    Started by anvee‎, 08-14-2014 02:35 PM
    animal behavior, behavioral experiment, jmp, nested anova, preference
    • Replies: 0
    • Views: 2,777
    08-14-2014, 02:35 PM Go to last post
  23. 10 point scale and central limit theorem

    I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

    Started by micdhack‎, 03-31-2012 08:43 AM
    • Replies: 6
    • Views: 2,776
    04-03-2012, 05:20 AM Go to last post
  24. help on statisitcal test to use

    Hi! In my research I am using a surrogate approach (number of surrogates=100) and I making a comparison among indeces (as correlation indeces...

    Started by netrunner‎, 08-18-2008 03:29 AM
    • Replies: 0
    • Views: 2,775
    08-18-2008, 03:29 AM Go to last post
  25. Statistical testing with very small sample

    Hi all, I have a problem which wasn't covered by any of my econometrics classes. I am going to run an economic experiment. Unfortunately, I just...

    Started by TimoV‎, 01-29-2012 06:26 AM
    • Replies: 3
    • Views: 2,772
    01-30-2012, 03:21 PM Go to last post
  26. Poisson point process

    I came across this in a network model: Distribute N points according to a homogeneous Poisson point process in a two-dimensional space of unit...

    Started by spinningfeather‎, 12-06-2016 02:24 PM
    • Replies: 0
    • Views: 2,772
    12-06-2016, 02:24 PM Go to last post
  27. Question Help with thesis research on social bookmarking

    Hi, I'm writing my thesis right now and I must admit that I underestimated the complexity of the required statistics a bit. My description is quite...

    Started by HFFL‎, 09-01-2008 12:21 PM
    • Replies: 1
    • Views: 2,765
    11-07-2008, 09:54 PM Go to last post
  28. Homogenity and Heterogenity

    Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

    Started by dervast‎, 05-06-2010 10:29 AM
    • Replies: 1
    • Views: 2,765
    05-08-2010, 01:09 AM Go to last post
  29. Is the 2-independent group T test ok?

    I would like a suggestion on what analysis to run for my data, and whether a 2-independent sample T test is ok to do because my dependent variable is...

    Started by needinghelp‎, 04-25-2009 03:40 PM
    • Replies: 0
    • Views: 2,763
    04-25-2009, 03:40 PM Go to last post
  30. Binomial Test that does not assume indepence? (using a repeated measures design)

    Hi, I am looking for a way to analyze data for the following experiment: subjects were presented with two separate acoustic signals at the same...

    Started by ochracea‎, 08-22-2009 10:23 PM
    • Replies: 1
    • Views: 2,761
    08-23-2009, 01:08 PM Go to last post
  31. Kernel Density Estimation (KDE)

    I feel unsure as to what is the minimum number of genuine (real life) data points needed to applied the procedure and estimate the curve. Any...

    Started by dzericak‎, 01-03-2012 09:42 AM
    • Replies: 3
    • Views: 2,761
    01-03-2012, 07:08 PM Go to last post
  32. What test should i use for this lot?

    Hi all I am new to this forum and am a first time poster. I am an ecologist and have gathered a load of field data but don't know what to do with...

    Started by rorys‎, 05-02-2013 10:51 AM
    • Replies: 0
    • Views: 2,760
    05-02-2013, 10:51 AM Go to last post
  33. Anova

    I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125,...

    Started by saad2733‎, 02-28-2016 01:42 PM
    anova, minitab
    • Replies: 5
    • Views: 2,758
    02-29-2016, 06:07 AM Go to last post
  34. Garch fitting when some of the data might be inaccurate

    Can anyone guide me to any newbie-ish literature on how to fit garch parameters (for example in Garch 1,1) to data where a small percentage of...

    Started by paulepstein‎, 01-11-2010 10:53 AM
    • Replies: 0
    • Views: 2,757
    01-11-2010, 10:53 AM Go to last post
  35. Two Variables, Many Components :( Type 1 Error?

    Hey, Have spent ages trawling through the threads before I decide I would have to bother everyone with yet another question from a dissertation...

    Started by Elle_Belle‎, 03-28-2009 09:11 AM
    • Replies: 0
    • Views: 2,755
    03-28-2009, 09:11 AM Go to last post
  36. Standard Deviation of non-numerical data

    I am trying to determine the standard deviation data that is not itself numerical, but its count is. For example, If I have a dataset from a survey...

    Started by Ghostbusters‎, 03-05-2015 03:51 PM
    • Replies: 0
    • Views: 2,755
    03-05-2015, 03:51 PM Go to last post
  37. What would be the appropriate statistical tool?

    Dear all, I am a graduate researcher in the analysis phase of my research work. My research is an intervention research (n=14) trying to analyze the...

    Started by Jerrome‎, 01-10-2017 04:35 PM
    binary varibles, likert sacle, normality, t-test
    • Replies: 3
    • Views: 2,752
    01-11-2017, 06:17 AM Go to last post
  38. Question what test to use?

    I have a data set consiting of 50 vegetation plots. I have five possible categories for vegetation cover. Each category can range form 0 to 100% with...

    Started by pajo‎, 05-21-2009 08:49 PM
    • Replies: 2
    • Views: 2,751
    05-22-2009, 09:00 AM Go to last post
  39. Bonferroni correction in multiple linear regressions: HELP NEEDED

    Hi, I'm running the following regression in R for 16000 promotors and one Phenotype (let's say Systolic Blood Pressure, RR_sys): lm (RR_sys ~...

    Started by capocrimini‎, 12-14-2013 08:01 AM
    • Replies: 0
    • Views: 2,751
    12-14-2013, 08:01 AM Go to last post
  40. 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

    I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) e/(1 +...

    Started by Ade Sol‎, 01-27-2012 11:33 AM
    • Replies: 1
    • Views: 2,749
    01-27-2012, 11:54 AM Go to last post
  41. 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: 2,747
    04-26-2013, 08:59 PM Go to last post
  42. Smile need help for my research

    Hello ! Two types of people probably lurk on this type of Internet site! The ones who hate statistics and for which numerical logic remains a...

    Started by statstruggler‎, 08-03-2008 11:23 AM
    • Replies: 0
    • Views: 2,745
    08-03-2008, 11:23 AM Go to last post
  43. Wilcoxon rank sum test on Cross Validation Results

    Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

    Started by gajan‎, 01-30-2012 04:30 AM
    cross validation, wilcoxon rank sum test
    • Replies: 2
    • Views: 2,745
    01-31-2012, 03:33 AM Go to last post
  44. 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: 2,744
    09-18-2012, 09:55 AM Go to last post
  45. Help with interpreting simple chi-square!

    Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

    Started by cassandra‎, 08-11-2012 05:54 AM
    • Replies: 2
    • Views: 2,740
    08-11-2012, 12:48 PM Go to last post
  46. Item Response Question

    I have received some survey data for 200 respondents. DV: Binary (20=1; 180=0) 20 IVs, Likert 5-point scale and currently treated as...

    Started by hlsmith‎, 11-10-2016 09:12 AM
    • Replies: 5
    • Views: 2,740
    11-14-2016, 03:21 AM Go to last post
  47. Question Likert scale in SPSS

    Hello, Ive got an research assignment to do by means of questionnaire. Ive got some basic info (gender, education level, etc) and then Ive got 9...

    Started by afronef‎, 12-13-2016 06:49 AM
    • Replies: 1
    • Views: 2,740
    12-13-2016, 08:11 AM Go to last post
  48. Negative Pearson r ? Absolute value?

    Help! I'm computing a Pearson Product-Moment Correlation and I get a negative r-value of -0.75. When I test for significance using a t-test, my...

    Started by Jennifer Nyman‎, 12-01-2012 06:48 PM
    • Replies: 7
    • Views: 2,735
    12-01-2012, 07:46 PM Go to last post
  49. Package testing using likert scale

    We recently finished a survey using a likert scale to compare attributes of consumer packaging(sample question below). The same question was asked...

    Started by chese79‎, 08-19-2011 04:44 PM
    likert, likert interpretation, likert scale
    • Replies: 0
    • Views: 2,733
    08-19-2011, 04:44 PM Go to last post
  50. Bayesian: Defining priors from *same* data set you're modeling

    I believe that it is inappropriate to define prior distributions based on the same data you will be analyzing with those priors. In other words, the...

    Started by BayesianGirl‎, 09-22-2011 02:12 PM
    bayes, bayesian, bayesian inference, prior
    • Replies: 1
    • Views: 2,732
    09-22-2011, 07:47 PM Go to last post
  51. Post PAVA - isotonic regression

    Hello, I'm searching for a research, and I hope I can get your help. I have an article showing an estimator for a cdf F, Fn, based on a function...

    Started by nunoadiga‎, 04-09-2011 11:27 AM
    • Replies: 0
    • Views: 2,729
    04-09-2011, 11:27 AM Go to last post
  52. Can you combine survey responses for a Confidence Interval

    Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

    Started by lincoln5‎, 11-06-2010 01:31 PM
    • Replies: 2
    • Views: 2,728
    11-10-2010, 11:04 AM Go to last post
  53. abnormal data, log transform data, still abnormal, what to do?

    Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

    Started by cherries‎, 12-07-2012 11:56 AM
    • Replies: 6
    • Views: 2,728
    06-20-2013, 02:19 PM Go to last post
  54. markov chains- estimation

    Hello all, my task is to estimate parametres of markov chain model basing on real economic data. Does anyone have any idea what sort of data would...

    Started by zhukov‎, 01-11-2008 05:23 PM
    • Replies: 1
    • Views: 2,726
    01-12-2008, 10:19 AM Go to last post
  55. pearsons versus spearmans

    Hi I have a very common but somehow still confusing question regarding correct correlation to use when addressing the relationship between two...

    Started by RuthH‎, 05-02-2010 08:37 AM
    • Replies: 1
    • Views: 2,724
    05-23-2010, 10:28 AM Go to last post
  56. MANOVA post hoc or simple main effect

    does anybody know, when conducting a 3 x 3 MANOVA, if the interaction effect and both main effects are significant, is there any...

    Started by Benson‎, 10-04-2011 09:10 AM
    • Replies: 0
    • Views: 2,723
    10-04-2011, 09:10 AM Go to last post
  57. unusual contrast in 2x2 mixed ANOVA

    A friend of mine sent me the following question this morning. I gave the best advice that I had, but I was curious to hear alternative feedback from...

    Started by Jake‎, 10-06-2011 10:30 PM
    • Replies: 0
    • Views: 2,722
    10-06-2011, 10:30 PM Go to last post
  58. need urgent help! how analyze data?

    Hi there, I hope anyone can help... Have been looking up text-book after text-book without getting the info I need! I am trying to analyze some...

    Started by SurveyQueen‎, 03-07-2009 10:56 AM
    • Replies: 0
    • Views: 2,721
    03-07-2009, 10:56 AM Go to last post
  59. Choosing a model for categorical data

    Hi all, I'm not very familiar with working with categorical data. I would like to model a categorical response variable (nominal, three levels) as a...

    Started by Heidi Swanson‎, 03-09-2010 05:20 PM
    • Replies: 2
    • Views: 2,721
    03-17-2010, 03:59 PM Go to last post
  60. Error with Skillings-Mack test in R

    I was trying to perform a Skillings-Mack test in R and can only get error message saying "Error in split.default(x = seq_len(nrow(x)), f = f, drop =...

    Started by skylandyu‎, 07-13-2015 12:12 PM
    • Replies: 0
    • Views: 2,719
    07-13-2015, 12:12 PM Go to last post

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