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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. Need for Bonferroni correction

    Hi All, I'm hoping you can help me figuring out whether doing ANOVA or MANOVA save on power. My understanding is that ANOVA will tell you if...

    Started by pbakker‎, 09-21-2011 02:00 PM
    • Replies: 4
    • Views: 4,468
    09-21-2011, 04:19 PM Go to last post
  2. 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
  3. Post Margin of error and the median

    Hi there, Was just wondering if someone could help me determine whether The general sampling error of a survey (margin of error) can be applied...

    Started by shokkk‎, 10-05-2011 07:34 PM
    • Replies: 4
    • Views: 7,432
    10-10-2011, 05:24 PM Go to last post
  4. mediate?? what does this word mean in terms of statistics?

    I know mediate in normal terms refers to intervening to to being agreement or reconciliation but in terms of statistics is it different? For example...

    Started by mimestra‎, 10-05-2011 08:30 PM
    • Replies: 4
    • Views: 12,573
    10-13-2011, 05:05 PM Go to last post
  5. Correlating behaviors in time

    This is definitely off topic but still linked. I saw some of what you do TheEcologist. I asked a question on here about correlating behaviors in...

    Started by trinker‎, 11-03-2011 10:57 AM
    • Replies: 4
    • Views: 2,859
    11-04-2011, 12:27 PM Go to last post
  6. Anova test?

    I have data for 09,10, and 2011. I have an exertion level for each individual. My indivduals are classified by the shift they work (8 day, 8 night,...

    Started by shanehall.m‎, 11-04-2011 10:14 AM
    anova, average, categorical vairable
    • Replies: 4
    • Views: 2,186
    11-07-2011, 09:34 AM Go to last post
  7. Chi Square - confused which variables to use.

    Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

    Started by Bluerosebowl‎, 11-04-2011 04:52 PM
    • Replies: 4
    • Views: 3,106
    11-14-2011, 08:38 AM Go to last post
  8. Testing Research Hypothesis

    Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

    Started by ghada8888‎, 11-14-2011 12:39 PM
    • Replies: 4
    • Views: 2,777
    11-15-2011, 08:59 AM Go to last post
  9. Cohort

    Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

    Started by dockiss‎, 11-16-2011 09:51 AM
    • Replies: 4
    • Views: 3,027
    11-18-2011, 01:04 PM Go to last post
  10. Which test to use for this?

    Hi folks, I'm conducting a little test with a friend who plays roulette online. He maintains that the 'spins' generated by online casinos are...

    Started by Jacobite‎, 12-30-2011 04:28 AM
    • Replies: 4
    • Views: 2,049
    12-31-2011, 02:47 PM Go to last post
  11. Sample Size Help

    I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

    Started by dougla‎, 01-19-2012 04:50 PM
    • Replies: 4
    • Views: 1,820
    01-24-2012, 12:24 PM Go to last post
  12. Lightbulb Indirect Effect Report

    Hi All, Im going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

    Started by ghada8888‎, 02-15-2012 05:29 PM
    • Replies: 4
    • Views: 3,963
    02-16-2012, 02:15 PM Go to last post
  13. Subseting a large dataset for analysis

    Hello all! Here's my situation: I have a data set that contains about 2.5 million observations, consisting of 13 variables in each row. Each row...

    Started by jtrubisz‎, 02-15-2012 07:23 PM
    • Replies: 4
    • Views: 2,251
    02-15-2012, 08:54 PM Go to last post
  14. Question Multiple Imputation of Pre-Composite Scores

    I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

    Started by Fulanito de Tal‎, 02-21-2012 10:53 AM
    • Replies: 4
    • Views: 3,195
    03-02-2012, 06:33 PM Go to last post
  15. I'm working for the plaintiff

    Plaintiff is Mike. Pat collected Mike's oil royalties for 16 years and won't disgorge them - he's ditched his bank records and won't make an...

    Started by dennism‎, 03-25-2012 11:28 AM
    • Replies: 4
    • Views: 1,743
    03-26-2012, 09:57 PM Go to last post
  16. 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: 2,211
    04-10-2012, 07:13 PM Go to last post
  17. Stratified Random Sampling

    If the population size for each stratum is unknown and cannot be measured ? Can I still utilize this sampling procedure ? How to estimate the...

    Started by ryan8200‎, 05-07-2012 02:35 AM
    • Replies: 4
    • Views: 2,566
    05-27-2012, 10:18 PM Go to last post
  18. Bayesian approach to comparing parameters of two distributions

    This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

    Started by zipp83‎, 05-09-2012 02:27 AM
    • Replies: 4
    • Views: 2,955
    05-09-2012, 02:20 PM Go to last post
  19. Bayesian t-test

    Hello I tried looking for a simple explanation with an example of how to perform a procedure that will be equivalent to the t-test using Bayesian...

    Started by NN_STAT‎, 05-08-2012 02:07 AM
    • Replies: 4
    • Views: 4,146
    05-11-2012, 06:11 AM Go to last post
  20. Hypothesis Testing

    Hello , I have the following Null Hypotheses : There is no value grater than 20 If I have a population :...

    Started by medoos‎, 06-11-2012 06:28 PM
    hypothesis testing
    • Replies: 4
    • Views: 2,283
    06-11-2012, 06:49 PM Go to last post
  21. Distribution of p values

    Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

    Started by NN_STAT‎, 07-30-2012 07:46 AM
    • Replies: 4
    • Views: 5,545
    08-01-2012, 09:11 AM Go to last post
  22. Statistical Theories, Methods, and Fields applying to Educational Assessment

    I'm interested in doing research in education and statistic. Particulary with student assessment and students. However, I know this is very broad and...

    Started by zaylia‎, 08-17-2012 12:52 PM
    • Replies: 4
    • Views: 1,907
    08-17-2012, 04:04 PM Go to last post
  23. Non-parametric confidence interval.

    Hi there, I am trying to understand how the attached paper estimated the confidence intervals for the data reported in Fig. 2. All the authors had...

    Started by ukhan1‎, 08-20-2012 08:54 PM
    • Replies: 4
    • Views: 2,038
    08-20-2012, 09:16 PM Go to last post
  24. 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: 1,938
    10-25-2012, 06:03 AM Go to last post
  25. Giving statistical significance to the max value of a vector

    Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

    Started by danny‎, 10-23-2012 03:11 AM
    • Replies: 4
    • Views: 1,859
    10-29-2012, 11:32 AM Go to last post
  26. Question 2x2 Repeated Measures ANOVA

    Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

    Started by Pedro‎, 10-25-2012 05:46 PM
    anova, two way
    • Replies: 4
    • Views: 3,115
    10-26-2012, 09:02 AM Go to last post
  27. What Exactly Constitues A Valid Meta-Analysis?

    Throughout my further studies in statistics, I was always concerned on what exactly makes a meta-analysis a valid meta-analysis. When I began my...

    Started by Musibrique‎, 10-30-2012 01:47 PM
    • Replies: 4
    • Views: 1,850
    10-31-2012, 01:55 PM Go to last post
  28. sample size estimation

    Dear All, I know that we can find the sample size formula from n=/me^2 but if the survey has 5 questions which two of them yes/no and 3 of them ...

    Started by masarimk‎, 11-19-2012 11:52 AM
    • Replies: 4
    • Views: 1,839
    11-20-2012, 01:20 PM Go to last post
  29. Question Survey Question with 4 Point Likert Scale and Yes/No Question

    Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type...

    Started by newbie4‎, 12-07-2012 01:24 PM
    calculation, likert scale, yes/no scaling
    • Replies: 4
    • Views: 14,795
    12-10-2012, 01:39 PM Go to last post
  30. 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: 1,222
    12-17-2012, 03:14 AM Go to last post
  31. Repeated Measures ANOVA Options?

    I was planning on running a repeated measures ANOVA but found these issues with my data. The assumption of sphericity was violated as assessed...

    Started by fqwc‎, 04-29-2013 06:49 AM
    • Replies: 4
    • Views: 1,475
    04-30-2013, 06:38 PM Go to last post
  32. Can fixed effects models deal with nested data?

    I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

    Started by trinker‎, 03-08-2013 01:39 PM
    multilevel model
    • Replies: 4
    • Views: 4,442
    03-10-2013, 03:41 PM Go to last post
  33. Chi and linear-by-linear

    A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

    Started by abacus‎, 03-13-2013 11:45 AM
    • Replies: 4
    • Views: 4,490
    03-14-2013, 01:37 AM Go to last post
  34. Correlation and Regression

    Hi all, I have a question about the significant p value in both correlation and regression. Is there any difference between the p values in both...

    Started by ghada8888‎, 04-09-2013 03:51 PM
    • Replies: 4
    • Views: 1,531
    04-10-2013, 02:37 AM Go to last post
  35. Wink What sample size do you need to not do signficance test

    Not really a statistical question I know.... This is covered in detail on another thread, but because of limits on my data I can not calculate a...

    Started by noetsi‎, 02-13-2013 10:30 AM
    • Replies: 4
    • Views: 1,250
    02-13-2013, 02:43 PM Go to last post
  36. Input needed on an current model to answer research question

    Hi, I'm currently working on a research project and would appreciate any input or suggestions. In the study, we examined breast cancer...

    Started by MJH91‎, 03-03-2013 02:18 PM
    • Replies: 4
    • Views: 1,436
    03-05-2013, 05:11 PM Go to last post
  37. Multiple comparisons and multiple time points

    Hi all, I wanted to ask a questions that I would assume I should know by now... I have done an experiment where I am evaluating the effect of...

    Started by Bioman‎, 03-08-2013 09:34 PM
    • Replies: 4
    • Views: 2,095
    04-01-2013, 02:10 PM Go to last post
  38. Statistical books (social sciences / policy analysis)

    Hello everyone! Next year I will be doing a MSc program in policy analysis at University of Leuven in Belgium. It's been a few years since I...

    Started by Kabouterke‎, 03-05-2013 07:09 AM
    • Replies: 4
    • Views: 1,868
    03-06-2013, 09:48 AM Go to last post
  39. Te assumption of Normality

    Hello i have some variables which consists of 41 cases,those cases represent averages of many cases,that is, for each case the average is calculated...

    Started by osamahamza‎, 03-11-2013 03:21 AM
    • Replies: 4
    • Views: 1,714
    03-14-2013, 06:04 AM Go to last post
  40. Statistical method(s) for repeated measures....

    Hi all, I'm doing a project where I want to see the effect of diet. The tricky part here is that same people have been answering a questionnaire...

    Started by userfriendly‎, 03-04-2013 03:17 AM
    • Replies: 4
    • Views: 1,812
    04-01-2013, 02:26 PM Go to last post
  41. Hierarchical (nested) ANOVA non-significant interactions

    Hi, I am trying to build and test models in hierarchical Analysis of Variance. I wondered if someone could offer some advice as to what to do if...

    Started by stats-student‎, 02-20-2013 11:07 AM
    • Replies: 4
    • Views: 1,641
    03-04-2013, 08:03 AM Go to last post
  42. Durbin-Watson statistics - autocorrelation

    If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

    Started by eunkum‎, 03-21-2013 10:25 AM
    • Replies: 4
    • Views: 3,427
    03-21-2013, 04:01 PM Go to last post
  43. MLE for correlation (not covariance) matrix?

    Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

    Started by Daniel Dvorkin‎, 02-08-2013 10:06 AM
    • Replies: 4
    • Views: 3,649
    02-08-2013, 11:33 AM Go to last post
  44. Hypotheses testing in CFA.

    Hi, I am struggling to understand, how support/reject the hypotheses addressed by my research model. I have conducted a second order CFA and...

    Started by deto4ka‎, 04-24-2013 01:30 PM
    • Replies: 4
    • Views: 1,470
    04-24-2013, 03:27 PM Go to last post
  45. Question difficulties with finding a suitable research question(s)

    Hello, everyone, :wave: I have an ANOVA-analysis task, and I need to come up with the most suitable research questions for it. the task is as...

    Started by invisibleme‎, 05-03-2013 07:45 AM
    anova, research questions
    • Replies: 4
    • Views: 1,218
    05-03-2013, 08:26 AM Go to last post
  46. How to analyse this ranking survey ?

    Hi all, I got a project from a newspaper company to find out the consumer preference of different middle income and high income group people that...

    Started by ravirocks2789‎, 05-19-2013 12:16 PM
    • Replies: 4
    • Views: 2,553
    05-22-2013, 10:53 AM Go to last post
  47. Interpreting the "Rotated component matrix" in Varimax Factor Analysis

    So I did Varimax factor analysis for 21 questions in order to group them. As per my understanding the rotated component matrix places each question...

    Started by Susan83‎, 06-06-2013 11:18 PM
    factor analysis
    • Replies: 4
    • Views: 19,045
    06-07-2013, 05:14 PM Go to last post
  48. Ecological statistics - comparison across three years

    Hello all, I have a rather large data set to analyze, and I would appreciate some guidance. For this dataset, 80 plots were sampled for dead tree...

    Started by Mu10‎, 06-03-2013 06:29 PM
    • Replies: 4
    • Views: 1,765
    06-08-2013, 04:38 PM Go to last post
  49. Post Am I applying this Chi-squared test correctly?

    Hi everyone! I am a history grad student and I am trying to use some statistics in one of my papers. I am working with a certain (ancient) text...

    Started by badslacker‎, 06-15-2013 08:26 PM
    • Replies: 4
    • Views: 1,753
    06-16-2013, 08:53 PM Go to last post
  50. Talking Which test to use?

    Thanks in advance for reading my post. I have a year's worth data that describes the frequency of patient falls organized by the attending...

    Started by jaimeiam‎, 06-19-2013 07:14 PM
    significant difference, standard deviation, statistical tests, variance
    • Replies: 4
    • Views: 1,251
    06-21-2013, 02:07 AM Go to last post
  51. Finding Relationships with Crosstab Data

    first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

    Started by ccooper‎, 06-25-2013 02:04 PM
    • Replies: 4
    • Views: 2,075
    06-25-2013, 04:52 PM Go to last post
  52. Extrapolating to a population from a sample

    Hello, I am having problems with a seemingly simple question. Here is the situation: Imagine, I grow 3 kinds of trees (A, B, C) for sale in a...

    Started by hhveluj‎, 07-12-2013 08:04 AM
    • Replies: 4
    • Views: 1,942
    07-18-2013, 02:22 PM Go to last post
  53. Question Are my observations independent or not?

    Hi everyone! I have an issue with my observations. I don't know if I can state they are independent or not. In my study, I have 8 different tasks...

    Started by supertoket‎, 07-16-2013 03:59 PM
    independent observations, t-test
    • Replies: 4
    • Views: 3,305
    07-18-2013, 02:33 PM Go to last post
  54. Why not go with tests dealing with unequal variances/unbalanced sample size first?

    Hi All, Here is the context: a lot of texts for hypothesis testing/ANOVA first examine the cases where either the number of samples per group are...

    Started by royk4444‎, 08-15-2013 08:51 PM
    anova, hypothesis testing, unbalanced data, unequal variance
    • Replies: 4
    • Views: 1,603
    08-16-2013, 02:56 AM Go to last post
  55. Is ANOVA applicable? If not what Statistical Tool woud you recommend?

    I am conducting a study to see whether differences exist among different age groups (10 year interval) to serious injuries. As far as I know, in...

    Started by geo_11‎, 08-22-2013 03:24 PM
    • Replies: 4
    • Views: 2,245
    08-23-2013, 12:36 AM Go to last post
  56. Meta-Analysis or alternative method?

    I am carrying out a systematic review on conservative (physiotherapy) treatment in comparison to surgical treatment. I have recorded the return to...

    Started by dpbyrne‎, 08-21-2013 04:49 AM
    • Replies: 4
    • Views: 1,990
    08-21-2013, 11:24 AM Go to last post
  57. Correlation Between Unpaired Data?

    What type of statistics compares or finds correlation of unpaired data? I'm assuming an XY scatter plot wouldn't work. I'm also assuming a t-test or...

    Started by odessa‎, 08-27-2013 09:58 AM
    correlation, ttest, unpaired data
    • Replies: 4
    • Views: 4,663
    08-27-2013, 12:15 PM Go to last post
  58. Asking causal questions directly vs measuring variables in a survey

    Hi all, is it okay to ask causal questions like "Does A cause B?" directly as survey questions instead of asking question that measure A and B...

    Started by labrat‎, 09-18-2013 06:12 AM
    causal inference, experiment design, survey design
    • Replies: 4
    • Views: 2,170
    09-19-2013, 10:59 AM Go to last post
  59. 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: 7,435
    09-18-2013, 07:50 AM Go to last post
  60. Negative confidence intervals

    HI THERE!! I am presenting 95% CIs in my thesis for the means of the data sets like metric tons of tuna exported per month, value of tuna exported...

    Started by nelson_rabbit‎, 09-24-2013 06:18 AM
    • Replies: 4
    • Views: 4,388
    09-24-2013, 08:47 AM Go to last post

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