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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: 18,683
    10-11-2014, 12:02 PM Go to last post
  1. Gibbs sampler problems

    I am trying to implement the gibbs sampler found here http://www.people.fas.harvard.edu/~plam/teaching/methods/mcmc/mcmc.pdf on page 175. It is...

    Started by aminnaar‎, 07-23-2013 12:08 PM
    gibbs sampler, python
    • Replies: 1
    • Views: 1,631
    07-23-2013, 12:46 PM Go to last post
  2. sure independence screening in clustering


    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 3,037
    11-23-2016, 01:01 AM Go to last post
  3. interaction plot in logistic regression

    Dear All Hi I am Amir from Iran where we have no a well know psychologist especially in quantitative. I am working on a data with a dummy variable...

    Started by amirpakpour‎, 08-06-2013 07:04 PM
    • Replies: 1
    • Views: 5,338
    08-06-2013, 09:30 PM Go to last post
  4. 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: 2,491
    09-25-2011, 05:08 PM Go to last post
  5. reliability using split half method

    HI, I am supposed to do my reliability of my tool which has 30 questions MCQ type and the scoring is 0 and 1(correct answer),,,how am i supposed to...

    Started by Amit Barve‎, 11-16-2011 01:39 PM
    • Replies: 0
    • Views: 4,196
    11-16-2011, 01:39 PM Go to last post
  6. Question Association of demographic variables with the questionnaire,,27questions in likert sc

    hi, I am doing a research study to see the qualtiy of life of patients,so i am having a questionnaire which uses likeret scale to collect response...

    Started by Amit Barve‎, 12-08-2011 02:37 AM
    • Replies: 0
    • Views: 1,897
    12-08-2011, 02:37 AM Go to last post
  7. Please read me.

    Hi guys, please read me. I need your help. I am a medical student and I am confused with statistics for my research. Ive seen videos in youtube but...

    Started by amitaf‎, 10-02-2015 04:09 AM
    • Replies: 2
    • Views: 1,379
    10-02-2015, 07:32 AM Go to last post
  8. Statistical matching

    Hi Folks, Am New to this statistical analysis domain, but have a problem at hand. I have a list of movies and each movie have various attributes...

    Started by amit_tomar‎, 04-07-2011 04:36 PM
    • Replies: 0
    • Views: 2,718
    04-07-2011, 04:36 PM Go to last post
  9. Help on Factor analysis and Extension

    Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

    Started by amjath‎, 01-21-2009 05:08 PM
    • Replies: 8
    • Views: 5,213
    01-26-2009, 12:28 PM Go to last post
  10. What kind of ANOVA is this?

    I'm doing an MRI research study on source memory and aging using emotional stimuli. This is probably a fairly basic question, but I'm not sure what...

    Started by amk86‎, 08-20-2008 03:18 PM
    • Replies: 2
    • Views: 2,363
    08-21-2008, 12:36 PM Go to last post
  11. Thumbs up Industry effects

    Hi! I'm currently doing my master's thesis and I came accross the following problem: I have an (unbalanced) panel data sample consisting of...

    Started by AmosAnderson‎, 12-29-2010 06:43 AM
    • Replies: 1
    • Views: 1,879
    01-01-2011, 11:02 PM Go to last post
  12. Cut-off criterion for likert scales

    Dear all, I really need some help solving the following problem: I am currently finalizing my master thesis and I am still insecure about a...

    Started by Amowiel‎, 11-18-2010 04:47 AM
    • Replies: 0
    • Views: 5,210
    11-18-2010, 04:47 AM Go to last post
  13. How can I analyse this data is the best way possible?

    How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

    Started by Amritanar‎, 04-17-2016 04:46 AM
    • Replies: 0
    • Views: 862
    04-17-2016, 04:46 AM Go to last post
  14. contingency table

    I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three...

    Started by amtdys‎, 12-17-2013 12:22 AM
    • Replies: 0
    • Views: 1,877
    12-17-2013, 12:22 AM Go to last post
  15. Exclamation Suggest an Unbiased estimator for θ

    Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

    Started by amul28‎, 08-19-2010 12:59 AM
    • Replies: 3
    • Views: 91,372
    08-19-2010, 03:49 AM Go to last post
  16. Suggested form of statistical analysis?

    I appreciate the feedback so far. Now, I'm wondering what type of statistical analysis I CAN do with a large amount of data that is pretty important...

    Started by amyleva‎, 05-11-2012 09:17 AM
    anova, paired t
    • Replies: 6
    • Views: 1,562
    05-15-2012, 02:14 AM Go to last post
  17. Measuring the impact of nearest-neighbour imputation.

    I am working on survey data, with missing values imputed using a nearest neighbour method. I am currently interested in assessing the effect of...

    Started by an1couk‎, 11-19-2012 03:50 PM
    • Replies: 0
    • Views: 1,339
    11-19-2012, 03:50 PM Go to last post
  18. 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: 2,831
    03-31-2011, 10:49 AM Go to last post
  19. Testing Historical Data

    Hello Folks, I have 5 years of data on GPA, credit completions etc. and several categorical variables ( ex. gender, ethnicity, age). I have tried...

    Started by Ana_Res‎, 11-18-2016 03:18 PM
    • Replies: 0
    • Views: 2,331
    11-18-2016, 03:18 PM Go to last post
  20. Repeated measures analysis for Non-parametric data

    Hi everyone, I have a dataset that looks something like this: Patient.....Group.............Score_day1......Score_day2.....Score_day3...

    Started by anchms09‎, 01-26-2011 05:51 PM
    • Replies: 1
    • Views: 4,118
    06-01-2015, 05:18 AM Go to last post
  21. help needed with Fishers Exact Test (power calculation)

    Hello everyone. Hope someone can help me. I am running a Fisher exact 4 X 2 table analysis in SPSS. I have been informed its the correct test to...

    Started by ANCOVA'D‎, 05-25-2016 03:49 AM
    chi square, fishers exact, power analysis, power calculation
    • Replies: 0
    • Views: 723
    05-25-2016, 03:49 AM Go to last post
  22. Need help with power analysis GPower Novice

    Hello everyone. I am doing a power test for Fishers Exact Test on GPower, and dont know how to determine the proportions p1 and p2. I have 2...

    Started by ANCOVA'D‎, 05-26-2016 01:32 PM
    power calculation, sample size
    • Replies: 0
    • Views: 938
    05-26-2016, 01:32 PM Go to last post
  23. huge differences in R2 between OLS and ordered logit regression model

    I was wondering why I get huge differences in R2 when running a ordered logit model and a OLS model. I use the same DV and IVs for both models. The...

    Started by andik‎, 05-06-2015 09:53 PM
    • Replies: 2
    • Views: 1,252
    05-07-2015, 10:08 AM Go to last post
  24. correlation matrix: Bonferroni or not Bonferroni is my question

    Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

    Started by andik‎, 12-02-2015 07:47 PM
    • Replies: 4
    • Views: 1,411
    12-03-2015, 08:50 PM Go to last post
  25. which reference category for factor variables

    Hello, I was wondering if there is any systematic rational of how to decide which category of a factor variable (e.g. level of education -primary,...

    Started by andik‎, 12-29-2015 09:35 PM
    • Replies: 3
    • Views: 1,373
    12-30-2015, 11:51 AM Go to last post
  26. Dependance between categorical variables in a whole population

    Hello, I have a population of 507 documents (which represent the entire phenomena studied at a give time period) from which a series of variables...

    Started by AndiMonge‎, 09-17-2013 07:39 PM
    association, bivariate correlations, chi square, dependent variables, whole population
    • Replies: 0
    • Views: 762
    09-17-2013, 07:39 PM Go to last post
  27. From OLS to Box Cox to ?

    Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

    Started by andony‎, 08-29-2008 01:25 PM
    • Replies: 4
    • Views: 5,956
    08-31-2008, 02:58 PM Go to last post
  28. OLS assumptions after estimating robust standard errors

    Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

    Started by andony‎, 04-29-2009 10:54 AM
    • Replies: 1
    • Views: 3,219
    05-01-2009, 12:43 AM Go to last post
  29. strengths and weaknesses of Chi squared

    I would like to find out the strengths and weaknesses of using a chi squared test for goodness of fit testing

    Started by andrew03‎, 02-03-2011 04:35 PM
    • Replies: 0
    • Views: 7,599
    02-03-2011, 04:35 PM Go to last post
  30. strengths and weaknesses of unpaired t-test

    I would like to find out the strengths and weaknesses of using an unpaired t-test for testing for the difference in means

    Started by andrew03‎, 02-03-2011 04:40 PM
    • Replies: 1
    • Views: 9,586
    02-03-2011, 10:12 PM Go to last post
  31. Samples drawn from distributions without means: What inferences from subsamples?

    I am doing some work for a small nonprofit on time trends in U.S. income inequality, and comparing estimates based on samples from different surveys....

    Started by AndrewHoerner‎, 11-02-2010 02:13 PM
    • Replies: 1
    • Views: 2,862
    11-19-2010, 01:05 AM Go to last post
  32. Correlations between twins - who is X and wo is Y?

    I have some data on twins (all fraternal) and I'm trying to see if there is any correlation between them on several measures (e.g., body...

    Started by andrewkent‎, 05-24-2012 02:50 PM
    correlation, twin studies, twins
    • Replies: 7
    • Views: 2,651
    05-24-2012, 04:33 PM Go to last post
  33. 3-Way ANOVA Woes (Levene's Test)

    Hi all, I'm doing a study on the amount of a protein found in a brain region after different manipulations. Exercise is thought to increase it, a...

    Started by AndrewLoG‎, 03-18-2014 07:18 PM
    • Replies: 0
    • Views: 2,125
    03-18-2014, 07:18 PM Go to last post
  34. Calculating forecast error for a long-term volatility forecast

    Hi, I am trying to calculate the forecast standard error for a long-term volatility forecast of a time series. I am simply using the unbiased...

    Started by AndrewLong‎, 08-11-2015 05:55 AM
    error, forecast, forecast error, standard error, volatility
    • Replies: 0
    • Views: 991
    08-11-2015, 05:55 AM Go to last post
  35. Fisher's z transformation in path analysis

    Hi guys. I am a psychology honours student doing my thesis by producing a path analysis that I ran with two different samples - one with a younger...

    Started by AndrewTheSeer‎, 09-21-2009 09:14 PM
    • Replies: 0
    • Views: 3,356
    09-21-2009, 09:14 PM Go to last post
  36. estimate a range of measures

    Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

    Started by andrew_fg‎, 03-12-2016 05:41 AM
    biostatistics, estimate, measurement
    • Replies: 0
    • Views: 989
    03-12-2016, 05:41 AM Go to last post
  37. ANOVA or Correlational analysis? Which one to use?

    Hello everyone, I am currently working on my dissertation and aim to identify the relationship between parent-child interaction and behavior of...

    Started by Andy26‎, 10-18-2015 02:25 PM
    • Replies: 4
    • Views: 1,657
    10-22-2015, 06:35 AM Go to last post
  38. Audit sample methodology question ... what do you call this?

    Hi there, This may be a method question rather than a stats one, but I'm hoping someone can help. Here's the situation in brief: I work in...

    Started by AndyB‎, 06-08-2011 02:22 AM
    • Replies: 0
    • Views: 2,104
    06-08-2011, 02:22 AM Go to last post
  39. longitudinal analysis help

    Hi there Im struggling to figure out which statistical test i need to use on my data and then also how to carry this out in R or SPSS.... I have...

    Started by andyspeak‎, 12-15-2011 10:25 AM
    longitudinal study, time-series
    • Replies: 6
    • Views: 2,564
    12-29-2011, 01:09 PM Go to last post
  40. Comparing an ecological subsample to population

    I have 2 batches of tree species and abundance data collected for a city. The difference between them is the sampling strategy - one was random...

    Started by andyspeak‎, 06-23-2017 08:22 AM
    braycurtis, ecology, population, sampling
    • Replies: 1
    • Views: 516
    06-26-2017, 06:01 PM Go to last post
  41. is it possible to have multiple mediators that all fully mediate

    I have a situation where I found my two mediators are both full mediators Does it make sense? I would think there should be only one full mediators...

    Started by angelaabd‎, 02-14-2009 02:27 AM
    • Replies: 1
    • Views: 2,772
    02-14-2009, 03:15 AM Go to last post
  42. weibull distribution

    i'm studying film life cycle using the weibull distribution. given the survival function, there exists the hazard rate, or the failure rate, a point...

    Started by angelo_s‎, 02-04-2008 12:50 PM
    • Replies: 0
    • Views: 2,741
    02-04-2008, 12:50 PM Go to last post
  43. Question Repeated measurements are negatively correlated

    I have a set of data on 9 subjects. A measurement is taken every week for 10 consecutive weeks. Say I would like to compare the measurements taken on...

    Started by anggraini_13‎, 01-20-2009 03:07 AM
    • Replies: 0
    • Views: 2,315
    01-20-2009, 03:07 AM Go to last post
  44. need help with research paper

    Hello! I apologize in advance for being "statistically" dumb. I am writing a research paper, very brief one for 3000 words. Basically, it's...

    Started by angiar87‎, 12-20-2012 02:33 PM
    • Replies: 0
    • Views: 1,221
    12-20-2012, 02:33 PM Go to last post
  45. Lightbulb Idea for a project (data set selection)!

    Hello everyone! I really need your help!!! I'm taking a risk class, and I have to do a final project, but I don't know yet what data set to pick. ...

    Started by ani‎, 10-30-2011 10:55 PM
    • Replies: 1
    • Views: 1,565
    10-30-2011, 11:09 PM Go to last post
  46. concordance of two sets of data

    here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

    Started by anjan_purkayastha‎, 10-13-2008 12:29 PM
    • Replies: 0
    • Views: 3,356
    10-13-2008, 12:29 PM Go to last post

    Hi, I have a question on which statistical test to use for 2 separate problems: 1) I have 4 different groups, 1A, 1B, 2A and 2C and have 3...

    Started by Anna12‎, 04-21-2014 12:13 PM
    anova, manova
    • Replies: 1
    • Views: 1,872
    05-07-2014, 05:41 AM Go to last post
  48. Fisher's exact test, Hypergeometric distribution

    Hi, I need some help with Fisher's exact test and the hypergeometric distribution My data consists of: 500 mutations - that I want to score as...

    Started by AnnaS‎, 04-24-2012 08:19 AM
    fisher's exact test, hypergeometric
    • Replies: 0
    • Views: 3,423
    04-24-2012, 08:19 AM Go to last post
  49. Need help with growth model

    Hi, I have a research question that I am not sure how I should answer it. I think I may have to use growth model, but not sure! I appreciate your...

    Started by anna_258‎, 01-16-2015 04:56 AM
    • Replies: 0
    • Views: 1,140
    01-16-2015, 04:56 AM Go to last post
  50. question on statistical analysys

    Hi, I am a java developer and don't know much about statistics so please pardon me if I have posted in wrong forum or asking wrong question. I...

    Started by annbasso‎, 09-17-2010 01:43 PM
    • Replies: 0
    • Views: 1,772
    09-17-2010, 01:43 PM Go to last post
  51. Missing data analysis

    Hello, I have a longitudinal study with a very high drop-out. At Time 1, I have 93 participants, but only 47 of them took part at Time 2. Now,...

    Started by Annelie‎, 04-21-2011 09:07 AM
    • Replies: 1
    • Views: 1,989
    04-21-2011, 09:42 AM Go to last post
  52. Exclamation Picking the correct test, need help urgently!

    Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

    Started by Annielk‎, 04-09-2014 09:16 AM
    assumptions, chi sq, independance, statistics
    • Replies: 3
    • Views: 1,133
    04-09-2014, 12:35 PM Go to last post
  53. canonical correlation in discriminant analysis

    I know it represents how good a variable discriminates, but what is the range of this? What does it actually mean when for example the canonical...

    Started by Annvdb‎, 06-10-2014 12:09 PM
    • Replies: 0
    • Views: 1,488
    06-10-2014, 12:09 PM Go to last post
  54. Do you like this measure for status inconsistency?

    For my thesis I have a variable named 'status inconsistency', so I want to compare people whose income or profession doesnt allign with their...

    Started by Annvdb‎, 10-28-2014 12:35 AM
    spss, status inconsistency
    • Replies: 0
    • Views: 1,672
    10-28-2014, 12:35 AM Go to last post
  55. Which analyzing technique?

    Im currently working on my thesis and I wonder which analysis technique to use. I have 2 dependent variables: voting choice (1 exwtreme left,...

    Started by Annvdb‎, 11-05-2014 04:13 AM
    logistic regression, multinomial regression
    • Replies: 0
    • Views: 1,399
    11-05-2014, 04:13 AM Go to last post
  56. Prerequisite for gene regulatory network research (systems biology)

    I would appreciate any advice or directions on what to study and in what order, from basic statistics and probability course to were one is able to...

    Started by anog‎, 02-24-2011 03:46 PM
    biology, cell, model selection, system biology, systems
    • Replies: 0
    • Views: 2,905
    02-24-2011, 03:46 PM Go to last post
  57. Two questions about my study

    I have 2 questions about my study: 1. I did a study but now I have only one male and the rest are females. I have like 19 sample size. So should I...

    Started by anoopbal‎, 03-02-2014 09:09 AM
    ancova, standard error
    • Replies: 1
    • Views: 1,184
    03-04-2014, 01:40 AM Go to last post
  58. Need help picking model to use with psuedo time series data

    Hello everyone. I have quite a few questions and would like some help/advice or a general pointing i the correct direction. I have a dataset that...

    Started by Anotherdream‎, 02-25-2015 10:23 PM
    • Replies: 0
    • Views: 1,167
    02-25-2015, 10:23 PM Go to last post
  59. Is this a vaild data transformation method?

    Hello Talkstats people, I am another hopeless case who needs some help with my dissertation statistics. Basically I am not sure if the method...

    Started by anotherhopelesscase‎, 11-26-2008 09:49 AM
    • Replies: 0
    • Views: 4,408
    11-26-2008, 09:49 AM Go to last post
  60. which test I should use?

    hello, i am conducting research on retail atmosphere in which i have collected data on three different retailing sectors i.e furniture retailers,...

    Started by Anoushey Ali‎, 07-13-2011 12:21 PM
    • Replies: 3
    • Views: 2,133
    07-13-2011, 04:09 PM Go to last post

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