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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: 18,760
    10-11-2014, 12:02 PM Go to last post
  1. What should I use if I want respondent regression coefficients to predict the group?

    I have 3 hundred rows of data. Each row represents a unique person. I have a total of 38 columns of data where column 1 is the person, columns 2-37...

    Started by ShmelkDog‎, 06-05-2013 02:25 PM
    • Replies: 0
    • Views: 1,034
    06-05-2013, 02:25 PM Go to last post
  2. What specific type of GLM to use?

    I'm trying to figure out what type of distribution (Poisson or binomial) to use to measure differences in proportions using logistic glm. Basically I...

    Started by atamalu‎, 03-12-2017 06:25 PM
    • Replies: 2
    • Views: 1,387
    03-13-2017, 04:52 PM Go to last post
  3. What statistic to use?

    I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

    Started by elisayoung‎, 04-27-2009 07:19 PM
    • Replies: 1
    • Views: 3,436
    04-28-2009, 01:13 AM Go to last post
  4. Question What statistical analysis or methods to use?

    I'm trying to learn a bit here and I'm experimenting on some data I have available. The data is user records with data appended to each record that...

    Started by jonmrich‎, 12-02-2013 10:11 AM
    • Replies: 0
    • Views: 1,176
    12-02-2013, 10:11 AM Go to last post
  5. Exclamation What statistical analysis tests to use for these 3 questions

    1. Examining the effects of being a victim of violence (categorical yes/no) on hostile attribution scores (continuous variable)? 2. Examining the...

    Started by lindalmw‎, 07-13-2015 04:43 AM
    • Replies: 3
    • Views: 2,143
    07-29-2015, 03:10 AM Go to last post
  6. What statistical model could possibly be used here?

    Hi guys, Could you please have a look at the chart attached? I'm just wondering what statistical model could possible be used here to create that...

    Started by JennyK‎, 07-06-2011 12:09 AM
    • Replies: 0
    • Views: 1,969
    07-06-2011, 12:09 AM Go to last post
  7. What statistical procedures do I need to know to be a proficient psychologist?

    Or epidemiologist? Also, Do I need to go back and study matrix algebra in detail? Thank you? What are your experiences?

    Started by sampier85‎, 09-18-2012 04:25 PM
    applied statistics, psychology, regression analysis
    • Replies: 7
    • Views: 2,354
    09-20-2012, 12:48 PM Go to last post
  8. what statistical techniques to use?

    Hello all, I am really new to this, so please bear with me. In essence, I am looking at whether poor institutional performance encourages...

    Started by IR_STUDENT‎, 07-09-2013 07:12 PM
    • Replies: 0
    • Views: 1,330
    07-09-2013, 07:12 PM Go to last post
    • Replies: 0
    • Views: 2,059
    10-31-2010, 10:29 AM Go to last post
  9. Question What statistical test do i need to run?

    Hi there folks, I'm having a little difficulty choosing what statistical test i need to run, I've conducted a series of behavioural experiments,...

    Started by alflo‎, 12-16-2013 06:56 PM
    biology, help me!, statistical test
    • Replies: 0
    • Views: 1,171
    12-16-2013, 06:56 PM Go to last post
  10. What statistical test do I use to tell if my data statistically significant?

    This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of...

    Started by galaxz‎, 03-27-2015 08:12 PM
    correlations, statistical significance
    • Replies: 0
    • Views: 1,068
    03-27-2015, 08:12 PM Go to last post
  11. What statistical test do I use?

    Hi there, I'm doing a study on the influence of sexuality on a camouflaging questionnaire which has a score rating (0-40), so is an interval...

    Started by Mohil‎, 01-06-2017 11:16 AM
    • Replies: 1
    • Views: 2,896
    01-07-2017, 10:12 PM Go to last post
  12. Question What statistical test should I use for this data?

    Two groups (group A; group B) are given two treatments (M) and (B), and a control (Control) in different orders. Then the weight of food they consume...

    Started by gunwind‎, 12-30-2013 10:41 AM
    • Replies: 1
    • Views: 1,745
    12-30-2013, 10:46 AM Go to last post
  13. What statistical test should I use to check to ratio?

    I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

    Started by ch.niladri‎, 02-09-2011 01:21 AM
    • Replies: 6
    • Views: 14,948
    02-16-2011, 01:37 PM Go to last post
  14. What statistical test should I use to test for statistical significance?

    Hello fellow members, I haven't been using statistics for a long time and I have trouble recalling statistical tests and their use. I hope you can...

    Started by Tanja.M‎, 04-17-2016 10:27 AM
    • Replies: 1
    • Views: 1,433
    04-18-2016, 01:48 AM Go to last post
  15. What statistical test should I use?

    I have created high and low variables from 1 variable. I want to see whether the mean of the "high" subjects differs from the mean of the "low"...

    Started by lilchicken‎, 02-09-2011 12:46 AM
    • Replies: 4
    • Views: 2,856
    02-09-2011, 05:19 AM Go to last post
  16. What statistical test should I use?

    I've recently collected data as part of my university course to answer the question 'Does social structure in captive meerkats affect behaviour and...

    Started by tuppyl2‎, 05-16-2013 04:17 AM
    • Replies: 2
    • Views: 1,479
    05-16-2013, 08:17 AM Go to last post
  17. What statistical test should I use?

    I am wondering which statistical test I should use to analyse my data. I have 11 different individual sharks and energy data for each of them. The...

    Started by ruthyeh‎, 09-24-2013 09:39 AM
    • Replies: 0
    • Views: 1,228
    09-24-2013, 09:39 AM Go to last post
  18. What stats test to use?

    What test to use!? I have a data set in which I want to test if there is a difference between the means of a continuous variable for three...

    Started by nicklt‎, 12-15-2011 04:45 AM
    • Replies: 0
    • Views: 1,582
    12-15-2011, 04:45 AM Go to last post
  19. What test can I use to compare categorical and continuous variables?

    Hello guys: I have two sets of data, actual outcome (live vs. dead), which is categorical, and a risk adjustment predicted outcome, which is...

    Started by scerab‎, 08-09-2011 03:44 AM
    • Replies: 14
    • Views: 13,055
    08-09-2011, 02:58 PM Go to last post
  20. What test should have been used...

    Done with the assignment ... No replies :(

    Started by cloud‎, 10-15-2013 08:35 PM
    • Replies: 0
    • Views: 1,394
    10-15-2013, 08:35 PM Go to last post
  21. what test should i use for analysis of data from rct

    Hi I am writing a research proposal It is a rct that hopes to refute the null hypothesis the use of clary sage will have no effect on...

    Started by nasherbasher‎, 10-23-2013 03:07 PM
    • Replies: 2
    • Views: 2,252
    10-24-2013, 04:29 AM Go to last post
  22. 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: 2,617
    05-02-2013, 10:51 AM Go to last post
  23. What test should I use to analyze my data?

    I'm currently a fourth year university student. As part of my studies, I'm taking a class called Capstone, where students design and carry out a...

    Started by MelissaN‎, 11-05-2013 05:05 PM
    questionnaire, research, test to use, university
    • Replies: 1
    • Views: 2,634
    11-05-2013, 05:27 PM Go to last post
  24. What test to compare class data?

    I have given a pre and post test to two classes. One class did a particular activity (experimental group) and one class did not (control group). ...

    Started by justjess‎, 10-26-2013 02:30 PM
    • Replies: 0
    • Views: 1,366
    10-26-2013, 02:30 PM Go to last post
  25. Smile what test to do?

    Hi Would be grateful for a little guidance. I have a set of data with a mix of continous and categorical data I am trying to see if there is...

    Started by daran‎, 05-23-2009 02:51 AM
    • Replies: 1
    • Views: 1,977
    05-24-2009, 03:05 PM Go to last post
  26. What test to identify words used more frequently by one group than another?

    I have two groups of subjects, A and B. I have a text sample produced by each subject. My goal is to idenitfy those words that are used significantly...

    Started by 1234‎, 07-29-2013 12:53 PM
    frequency, word
    • Replies: 6
    • Views: 1,616
    07-29-2013, 03:23 PM Go to last post
  27. 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: 2,654
    05-22-2009, 09:00 AM Go to last post
  28. What test to use?

    I wonder if there are demographic variables (e.g., level of training, place of practice, age served) that determine knowledge on suicide. In my...

    Started by picaritos‎, 08-26-2012 05:22 PM
    • Replies: 2
    • Views: 1,826
    08-27-2012, 09:30 AM Go to last post
  29. What test to use?

    I'm glad I found this group. I'm currently studying on butterfly's garden preferences based on the number of butterflies caught in the area. I...

    Started by jjd‎, 06-20-2013 09:36 AM
    • Replies: 2
    • Views: 1,153
    06-20-2013, 12:04 PM Go to last post
  30. Question What test?

    HI! Thanks to anyone that is reading this!! I am a masters student and I am trying to figure out what test I should use to analyze some of my...

    Started by Candice‎, 07-25-2008 10:14 PM
    • Replies: 1
    • Views: 2,216
    07-26-2008, 10:26 PM Go to last post
  31. What tests and analysis for 50 year data collected on fashion trends

    So, it is said that whatever is in fashion once comes back someday or the other. We have collected data on 10 different garment types, each having 5...

    Started by sshresth12‎, 08-25-2016 02:38 AM
    cyclicality, research, time series analysis, trend detection
    • Replies: 1
    • Views: 720
    08-25-2016, 10:31 AM Go to last post
  32. Question What tests should I use to analyze my data? Immediate input appreciated

    Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

    Started by IDmedicine‎, 04-10-2011 03:48 PM
    unequal sample size, wilcoxon
    • Replies: 2
    • Views: 4,278
    04-10-2011, 07:13 PM Go to last post
  33. What tests should I use when my moderator is discrete?

    Hello everybody, I am currently in the final phase of my master thesis. I have collected my data and I am trying to do my statistical tests, but I...

    Started by willemvw‎, 01-14-2016 10:38 AM
    • Replies: 0
    • Views: 1,005
    01-14-2016, 10:38 AM Go to last post
  34. what to do for unknown PDFs.

    Hi guys 1) When we are performing signal detection , and we have received this y(n)=x(n)+z(n) for n=0,1,2,3...., where z is gaussian noise, but...

    Started by sibtain125‎, 04-12-2011 10:59 PM
    • Replies: 0
    • Views: 4,039
    04-12-2011, 10:59 PM Go to last post
  35. What to do if sample size is too big? (ttest)

    So I'm running ttests for a descriptive statistic table and all my results are significant, but I"m concerned that the sample size is too big 3,880...

    Started by vikingo‎, 01-23-2014 11:23 AM
    large sample size, power, pplot, sample size, ttest
    • Replies: 5
    • Views: 6,124
    02-01-2014, 05:47 PM Go to last post
  36. What to do when number of variables is greater than number of observations?

    What are some techniques that are utilized when the number of predictors is greater than the number of observations?

    Started by lord12‎, 01-30-2013 04:12 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,774
    02-15-2013, 02:36 PM Go to last post
  37. What to do when survey participants answer all '4's?

    I reached out to members of my organization to rank how they felt the company was performing on various topics, about 35 questions in total. Several...

    Started by Jane M‎, 07-09-2015 10:14 AM
    • Replies: 8
    • Views: 1,607
    07-09-2015, 12:24 PM Go to last post
  38. What to do with unequal sample sizes?

    I am working on this time-effect project in which we pulled data at different time points from a big old data set. The issue is that all subjects...

    Started by skylandyu‎, 07-09-2015 11:47 AM
    friedman test, linear mixed model, repeated measure anova, unequal sample size
    • Replies: 2
    • Views: 1,858
    07-09-2015, 12:01 PM Go to last post
  39. What to review before starting a PhD in statistics?

    Hello everyone, I will be starting a PhD program soon on a topic mainly related to bayesian statistics, sequential Monte-Carlo methods and...

    Started by Haribo‎, 02-27-2013 06:26 AM
    • Replies: 1
    • Views: 1,154
    02-27-2013, 10:55 AM Go to last post
  40. Lightbulb What type of analysis??

    The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

    Started by ayo jay jo‎, 03-29-2011 10:53 AM
    • Replies: 1
    • Views: 2,077
    03-29-2011, 07:11 PM Go to last post
  41. Smile What type of ANOVA test should I do?

    The same participants are exposed to two different screen sizes 27" (stimulus A) and screen size 9.7" (stimulus B). Independent var is "screen" with...

    Started by uxk8396‎, 08-27-2016 09:52 PM
    ancova, anova, descriptive statistics, multivariate analysis
    • Replies: 3
    • Views: 1,268
    08-28-2016, 07:31 PM Go to last post
  42. What type of sampling is this?

    Hi, I have some confusion about the kind of sampling I'm using. I started choosing manufacturing sector and within it chose 4 industries. Later I...

    Started by milehigh899‎, 06-21-2012 12:33 AM
    • Replies: 6
    • Views: 2,294
    06-21-2012, 10:30 PM Go to last post
  43. what type of statsitical test and survey to use

    hi I need help with my dissertation proposal. I have attached my research questions and a potential survey i could use. I dont know what statsical...

    Started by yankeeoneniner‎, 04-04-2012 07:29 PM
    • Replies: 1
    • Views: 1,383
    04-04-2012, 07:57 PM Go to last post
  44. What type of test should I use?

    I am trying to determine whether being involved in an extracurricular activity has an impact on different course grades (dependent variable),...

    Started by econh‎, 11-14-2015 12:57 AM
    • Replies: 2
    • Views: 1,162
    11-14-2015, 04:39 PM Go to last post
  45. 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: 2,568
    01-11-2017, 06:17 AM Go to last post
  46. What's the correct correction factor? Multiple one-sample and paired tests...

    This question concerns the chance of Type I error in hypothesis testing with multiple statistical tests. The data come from a series of experiments....

    Started by 5tudent‎, 11-21-2014 06:15 PM
    bonferroni, correction, familywise, pairwise, t-test
    • Replies: 6
    • Views: 2,932
    11-28-2014, 08:13 PM Go to last post
  47. What's the name of this distribution? (pdf ~ gaussian times x)

    Hi My apologies if this a simple question but, despite extensive searching, I seem unable to find an answer and I don't know the correct terms to...

    Started by kuoris‎, 12-14-2012 07:54 AM
    • Replies: 4
    • Views: 1,245
    12-17-2012, 03:14 AM Go to last post
  48. What's the null hypothesis here.

    I need to do a hypothesis test on the mean of bicycle hire lengths in London, the expectation is that the mean hire shouldn't exceed 60 minutes. ...

    Started by Wevans2303‎, 03-21-2012 11:30 AM
    • Replies: 5
    • Views: 2,891
    03-21-2012, 02:30 PM Go to last post
  49. When are random variables random?

    I have an environmental dataset in which a treatment was carried out on a series of plots (situated on the landscape) in duplicate. However the...

    Started by jdmac11‎, 11-26-2008 09:34 AM
    • Replies: 0
    • Views: 3,538
    11-26-2008, 09:34 AM Go to last post
  50. when Bootstrap Correlation coefficient (Pearson) con be used?

    Hi! Though I know the mechanics of the bootstrap methods, I am do not manage to find in literature a clear-cut explanation about when and in what...

    Started by gianmarco‎, 10-26-2010 06:19 AM
    • Replies: 0
    • Views: 4,106
    10-26-2010, 06:19 AM Go to last post
  51. When do we use...

    just out of curiosity.... where is Mathematical Statistics, if at all, do we use modern algebra (i.e Groups, Rings,....) ?

    Started by WeeG‎, 09-11-2010 09:23 AM
    • Replies: 3
    • Views: 2,361
    09-11-2010, 10:33 AM Go to last post
  52. Question When homogeniety of regression slopes (for ANCOVA) is significant.

    HI, I have conducted an ANCOVA and have a significant interaction when testing the homogeniety of regression slopes assumption. My IV is Group...

    Started by DancingSpirit‎, 03-19-2012 11:45 PM
    • Replies: 0
    • Views: 1,332
    03-19-2012, 11:45 PM Go to last post
  53. When is standardisation of data necessary?

    I am running regression analysis and cluster analysis on a data set. The variables differ in their scale of measurement some variables are ratings...

    Started by daisystat‎, 11-20-2013 03:32 PM
    • Replies: 0
    • Views: 1,119
    11-20-2013, 03:32 PM Go to last post
  54. Where do I start?

    Hi! I'm feeling overwhelmed here and don't know where to start. It is the second message regarding my project and any additional help would be...

    Started by Merlion‎, 01-20-2009 01:08 PM
    • Replies: 1
    • Views: 3,197
    01-21-2009, 09:40 AM Go to last post
  55. Where to find data (morning running vs evening running)?

    Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

    Started by john2012‎, 05-02-2012 10:29 AM
    • Replies: 9
    • Views: 2,701
    05-02-2012, 05:42 PM Go to last post
  56. Where to send an education methods piece

    I'm writing a piece that introduces a new correlation like measure between time periods. I would like to get this one published somewhere. The...

    Started by trinker‎, 05-17-2013 09:54 AM
    education, educational measurement, journal, research
    • Replies: 2
    • Views: 1,174
    05-18-2013, 02:20 AM Go to last post
  57. Where to start?

    I am trying to find the best way to identify the optimal quantity for packaging that reduces handling of product. example: Product 1 ...

    Started by JHallagin‎, 11-30-2011 02:41 PM
    • Replies: 2
    • Views: 1,458
    11-30-2011, 03:17 PM Go to last post
  58. 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: 2,293
    02-16-2011, 03:26 AM Go to last post
  59. Lightbulb Which analysis fits this research?

    Hi everyone! Apparently, evertbody in the forum seems to have quite some knowledge already, while I am only posting a rather easy questoin. I...

    Started by Wiebke.90‎, 05-07-2014 03:05 AM
    • Replies: 0
    • Views: 1,151
    05-07-2014, 03:05 AM Go to last post

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