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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: 18,616
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,536
    10-23-2012, 09:21 AM Go to last post
  2. Post What experimental design would be most appropriate?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-11-2016 03:40 PM
    • Replies: 0
    • Views: 2,535
    11-11-2016, 03:40 PM Go to last post
  3. Statistical significance on financial ratios

    Hello! I am currently trying to determine whether or not the implementation of IFRS has had a statistically significant effect on the return over...

    Started by Strela‎, 12-10-2010 10:38 PM
    • Replies: 0
    • Views: 2,534
    12-10-2010, 10:38 PM Go to last post
  4. 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: 2,534
    10-06-2011, 10:30 PM Go to last post
  5. Practical question about Page's L test

    I have a k number of 77. Unfortunately the table I've obtained only goes to 10. :shakehead... How can I otherwise calculate the Lcrit? Thank you

    Started by Piku‎, 12-03-2011 04:05 PM
    page's l trend
    • Replies: 0
    • Views: 2,533
    12-03-2011, 04:05 PM Go to last post
  6. A basic question. Pls help...

    Hi, When discussing the large sample theory, the professor in my econometrics course said sth that I found hard to grasp. He said something...

    Started by promaccat‎, 06-07-2009 01:21 PM
    • Replies: 1
    • Views: 2,532
    06-15-2009, 08:07 PM Go to last post
  7. 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: 2,532
    01-31-2012, 03:33 AM Go to last post
  8. 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: 2,531
    01-20-2017, 03:40 AM Go to last post
  9. paired sample t-test vs. repeated measures ANOVA

    I think that the Psychology Research forum is more appropriate so I moved my question there--I could not figure out how to delete this thread. Thank...

    Started by jmmu‎, 10-17-2014 08:03 PM
    anova, repeated measures anova, t-test
    • Replies: 0
    • Views: 2,530
    10-17-2014, 08:03 PM Go to last post
  10. 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: 2,530
    07-13-2015, 12:12 PM Go to last post
  11. Confused: correlated groups Chi Square?

    Hi all, I have three groups: Group C is a subset of Group B which is in turn a subset of Group A. Members of Groups B and C were not randomly...

    Started by tandanus‎, 09-27-2010 06:12 PM
    • Replies: 0
    • Views: 2,529
    09-27-2010, 06:12 PM Go to last post
  12. Relationship between time spans

    1. purpose of the study/technique- I want to examine time stamped transcripts for 2 or more behaviors to see if they correlate. When variable 1...

    Started by trinker‎, 10-13-2011 06:41 PM
    • Replies: 1
    • Views: 2,529
    10-13-2011, 06:49 PM Go to last post
  13. 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: 2,527
    06-20-2013, 02:19 PM Go to last post
  14. Longitudinal Statistics

    I'm performing a longitudinal study on allergen challenged (daily) mice (3 total) where I sample blood from the same mouse daily, over a week's time,...

    Started by WTB‎, 09-08-2006 04:34 PM
    • Replies: 1
    • Views: 2,526
    09-08-2006, 08:32 PM Go to last post
  15. Manova

    Hi, I need help with MANOVA analysis. I'm wondering which post hoc test you can use after MANOVA shows stat. difference in data. I have 4 groups...

    Started by orcagna‎, 01-29-2011 01:05 PM
    • Replies: 0
    • Views: 2,525
    01-29-2011, 01:05 PM Go to last post
  16. too large p-value

    Hi, I have a problem of interpretation of some results. The problem is the following: I have a model with 4 parameters I have N=55 data...

    Started by Arkonis‎, 11-29-2012 06:18 PM
    • Replies: 1
    • Views: 2,524
    12-01-2012, 07:57 AM Go to last post
  17. Analysis Likert Data and Comparing 2 Groups

    I have 2 groups of people. There are 75 people in each group. Each group was given the same set of 7 Likert items. I want to compare the results...

    Started by nigellscott‎, 05-30-2013 08:27 AM
    likert items
    • Replies: 7
    • Views: 2,521
    06-22-2013, 06:04 AM Go to last post
  18. 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: 2,518
    11-10-2010, 11:04 AM Go to last post
  19. 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: 2,518
    01-11-2017, 06:17 AM Go to last post
  20. bootstrap and non-stationarity

    Dear all, Is it true to say: If a time series X(t) does not satisfy the strict stationarity condition: P(X(t+1), X(t+2), ... , X(t+T)) =/=...

    Started by resetzero‎, 11-03-2009 02:06 PM
    • Replies: 0
    • Views: 2,517
    11-03-2009, 02:06 PM Go to last post
  21. Outliers (Multiple outlier detection - PROC ROBUSTREG)

    Can anybody describe to me (as simply as possible) what M-estimation and LTS estimation are? I'm trying to learn more about outlier detection...

    Started by lancearmstrong1313‎, 04-02-2012 12:49 PM
    • Replies: 0
    • Views: 2,515
    04-02-2012, 12:49 PM Go to last post
  22. 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: 2,514
    07-13-2011, 12:15 AM Go to last post
  23. Need a help on statistics pricing problem

    Attachement has the clear explanation Question is What can you conclude about the price in this problem if the probability function has...

    Started by sbokka‎, 08-21-2008 01:58 PM
    • Replies: 1
    • Views: 2,513
    08-21-2008, 08:00 PM Go to last post
  24. Hello Everyone, need stats help

    Hello everyone, :wave: I'm new to this forum. I need some help figuring out what kind of analysis to run for my undergraduate thesis. I did...

    Started by Rob at U of T‎, 04-09-2011 04:48 PM
    • Replies: 0
    • Views: 2,513
    04-09-2011, 04:48 PM Go to last post
  25. How can I statistically prove which data is more reliable

    We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

    Started by Bhaskar‎, 11-26-2016 12:56 AM
    • Replies: 0
    • Views: 2,511
    11-26-2016, 12:56 AM Go to last post
  26. suitable statistical method

    Hi all, This is my first post here. I have a data (Subset-A) requiring statistical treatment. Descriptive statistics of the data: Size =...

    Started by asanjuan‎, 10-04-2010 04:37 AM
    • Replies: 4
    • Views: 2,510
    10-08-2010, 04:39 AM Go to last post
  27. 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: 2,507
    04-26-2013, 08:59 PM Go to last post
  28. Insight from statisticians needed - identifying which parameters separate data.

    Hi, I've got a dataset consisting of a few hundreds of dimensions. Each dimension has a value assigned to it at every time point. The data is...

    Started by trelek2‎, 07-21-2013 06:26 PM
    • Replies: 0
    • Views: 2,506
    07-21-2013, 06:26 PM Go to last post
  29. Question comparison for 2 independent groups , t test or ANOVA

    What test should i use for a comparison between two independent groups of N=30. Also if a questionnaire is made with only 2 answers like yes or no...

    Started by shesaishi‎, 06-14-2013 04:28 PM
    anova, comparison, t test
    • Replies: 7
    • Views: 2,504
    06-15-2013, 07:47 AM Go to last post
  30. dealing with unequal sample sizes... can anyone help please?

    Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

    Started by ellie_w‎, 11-17-2014 10:10 AM
    representativeness, unequal sample sizes
    • Replies: 7
    • Views: 2,496
    11-18-2014, 04:14 AM Go to last post
  31. Question on Log-Likelihood. Thanks in advance.

    Question is: There are two lists of data, Y and X. Y is either 1 or 0, and X can be any number. And I have a logistic regression of Logit=B1*X, where...

    Started by luanzi‎, 11-17-2008 01:11 AM
    • Replies: 2
    • Views: 2,495
    11-17-2008, 12:28 PM Go to last post
  32. Technical name - Is this a 'multi-level model'?

    Hello. I am hoping that someone can tell me the technical name for the following type of analysis. I have a sense that it may be a 'multi-level'...

    Started by jesse‎, 07-27-2012 10:11 PM
    • Replies: 2
    • Views: 2,493
    07-28-2012, 01:15 AM Go to last post
  33. Which model to use for a meta-analysis? Fixed Vs Random effects model

    I'm having trouble choosing which model to use to analyze my findings. My meta-analysis is about how effective a drug is compared to placebo or no...

    Started by Katto‎, 04-02-2014 10:08 AM
    fixed effects model, met-analysis, random effects model, statistical research
    • Replies: 0
    • Views: 2,491
    04-02-2014, 10:08 AM Go to last post
  34. 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: 2,491
    06-10-2014, 12:37 AM Go to last post
  35. Help with choice of nonparametric?

    Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

    Started by Confused_Claire‎, 11-06-2010 08:33 AM
    • Replies: 2
    • Views: 2,490
    11-07-2010, 02:57 AM Go to last post
  36. Nonparametric methods

    If I have a sample with the size of the right and left arms of each of these people.So I have two dependent groups, since these are the same person,...

    Started by askazy‎, 12-12-2014 01:28 PM
    • Replies: 10
    • Views: 2,490
    12-16-2014, 06:30 AM Go to last post
  37. Unhappy Determining a new variance

    I am trying to understand a property of ML Estimates, that their distribution is asymptotically normal with covariance matrix inverse of Fisher's...

    Started by justin.sharber‎, 02-19-2011 12:13 AM
    • Replies: 1
    • Views: 2,485
    02-19-2011, 04:30 PM Go to last post
  38. Comparing two groups on multiple DVs

    Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

    Started by Amisa‎, 09-25-2011 01:08 AM
    alternative to bonferroni, multiple comparisons, t-tests
    • Replies: 4
    • Views: 2,485
    09-25-2011, 05:08 PM Go to last post
  39. Stuck on Battle Plan for analysis

    Hello, Currently I am looking for some advice regarding my research. Previous research has shown that Construct 1 and Construct 2 are both...

    Started by Mathis-Dantes‎, 11-20-2016 03:19 PM
    • Replies: 1
    • Views: 2,485
    11-21-2016, 03:10 AM Go to last post
  40. predictive analysis algorithm

    Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

    Started by fajo‎, 05-25-2010 07:57 AM
    • Replies: 0
    • Views: 2,484
    05-25-2010, 07:57 AM Go to last post
  41. Smile Sample

    Consider we have a random sample (120 answers) and a convenience sample (80 answers) from the same population. Since the means of both samples are...

    Started by Marte‎, 05-30-2010 01:37 PM
    • Replies: 3
    • Views: 2,484
    05-31-2010, 08:03 AM Go to last post
  42. Multinomial Logistic Regressions in SPSS

    Hello everybody! First of all, this is a repost, I don't know what happened with the original (maybe a mod deleted it without noticing me). ...

    Started by lapive‎, 12-22-2012 05:58 AM
    multinomial regression
    • Replies: 1
    • Views: 2,482
    12-25-2012, 11:25 AM Go to last post
  43. Stochastic digraph/motion model switching question

    Am deleting this post due to a lack of response. Sad forum...

    Started by Nav‎, 03-10-2010 05:30 AM
    • Replies: 1
    • Views: 2,480
    03-12-2010, 06:15 AM Go to last post
  44. Need help to understand which statistical test to use on my data.

    Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

    Started by bertomaycry‎, 04-25-2013 01:51 PM
    • Replies: 2
    • Views: 2,478
    04-25-2013, 03:25 PM Go to last post
  45. 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: 2,476
    09-22-2011, 07:47 PM Go to last post
  46. ROC Curves

    Good Morning, I have a problem that may perhaps be very simple, but I keep getting very stuck and very frustrated. I'm trying to produce ROC...

    Started by SiobhanRoisin‎, 11-18-2016 04:13 AM
    false positive rate, roc curves, true negative
    • Replies: 0
    • Views: 2,476
    11-18-2016, 04:13 AM Go to last post
  47. which statistics to apply?

    Purpose of my study is to understand better how the experimental lines I am using compare to the positive and negative controls under untreated or...

    Started by stats123‎, 09-28-2008 10:46 PM
    • Replies: 1
    • Views: 2,475
    10-06-2008, 09:15 AM Go to last post
  48. 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: 2,470
    08-11-2012, 12:48 PM Go to last post
  49. Cox Proportional Hazard method survival analysis

    Cox Proportional Hazard method survival analysis is the same as Cox regression analysis?

    Started by eunkum‎, 03-15-2013 03:43 PM
    • Replies: 1
    • Views: 2,470
    03-20-2013, 02:22 PM Go to last post
  50. Model Suggestions?

    Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

    Started by Flatnose‎, 05-15-2010 06:25 AM
    • Replies: 2
    • Views: 2,468
    05-20-2010, 08:07 AM Go to last post
  51. Help: relationship between Regime type and war

    Hy guys, i have a question and it's really important. I have to study the relationship between regime type and intrastate war. the dataset from...

    Started by bavarois‎, 04-08-2009 10:21 AM
    • Replies: 0
    • Views: 2,467
    04-08-2009, 10:21 AM Go to last post
  52. Assumptions for mix design anova with covariates

    Hello I Would like to nake a mix design (I HAVE TWO GROUPS -SICK AND HEALTHY), AND I made a cognitive measure of long / short exposure stimulus. ...

    Started by talgef‎, 12-26-2015 07:03 AM
    • Replies: 11
    • Views: 2,464
    01-01-2016, 01:36 PM Go to last post
  53. Survey on how frequently a group use a particular device: Which analysis methods?

    I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

    Started by clivegibbs‎, 11-08-2016 06:51 AM
    friedman test, survey, wilcoxon
    • Replies: 0
    • Views: 2,464
    11-08-2016, 06:51 AM Go to last post
  54. AR(1) Model: Are the results the same?

    Suppose we have 23 observations, with time t=1,2,...,23. The dataset has 3 variable, t (time), x (independent) and y (dependent). The dependent ...

    Started by swing‎, 07-27-2014 01:32 PM
    • Replies: 0
    • Views: 2,461
    07-27-2014, 01:32 PM Go to last post
  55. Probability of Default

    Hi all, I'm doing a project to predict probability of delinquent for individual loans. Seems the model I fit is not good and I want to improve the...

    Started by sufeipopo‎, 08-20-2014 02:19 PM
    • Replies: 2
    • Views: 2,458
    08-25-2014, 08:23 AM Go to last post
  56. 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: 2,457
    01-19-2011, 05:19 AM Go to last post
  57. Relationship between actual and expected

    Hi, I am trying to illustrate relationship between expected and observed occurrences for my variable X. Outcomes for my variable vary between 0-5...

    Started by samot79‎, 10-24-2016 06:46 AM
    • Replies: 0
    • Views: 2,457
    10-24-2016, 06:46 AM Go to last post
  58. How can I best analyze this data

    I have some data I am trying to analyze but was hoping to get some stats help with it. I'm not sure what the best way to analyze it is. I'm...

    Started by YellowM3‎, 01-24-2016 07:19 PM
    • Replies: 4
    • Views: 2,452
    04-13-2016, 04:04 PM Go to last post
  59. cronbach alpha for missing data

    Hi, I have an indicator which consists of questions 24, 25, 27, 29, 30, 31, and 32. I am in the middle of determining internal consistency and...

    Started by proc1125‎, 10-07-2014 06:25 PM
    • Replies: 0
    • Views: 2,451
    10-07-2014, 06:25 PM Go to last post
  60. variables in linear mixed model

    Hello, I'm performing a longitudinal study, that compares computer use duration measured by 2 different methods: by questionnaire and computer...

    Started by richterr‎, 02-11-2009 10:27 AM
    • Replies: 0
    • Views: 2,450
    02-11-2009, 10:27 AM Go to last post

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