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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: 18,772
    10-11-2014, 12:02 PM Go to last post
  1. Using an Independent t-test with Pre/Post data

    Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

    Started by cheekychica‎, 02-06-2012 08:51 PM
    • Replies: 6
    • Views: 4,578
    02-08-2012, 08:10 AM Go to last post
  2. Im struggling -What post-hoc analysis tests?

    Hi Guys Im new here and really hope you can help me out! Im having a struggle with some research data and have done the first part of some...

    Started by lilly‎, 02-16-2012 04:22 PM
    • Replies: 6
    • Views: 5,133
    02-20-2012, 12:30 PM Go to last post
  3. Categorical data goodness of fit question

    Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

    Started by szm‎, 02-21-2012 04:12 PM
    categorical data analysis, chi square, deviance, genmod, log linear
    • Replies: 6
    • Views: 3,580
    02-21-2012, 06:20 PM Go to last post
  4. Likert Scale

    Hi! Can you help me with my stat research problem? what is the difference between 3-point likert and 5-point likert scale? which is better to use and...

    Started by mae‎, 03-02-2012 05:03 AM
    • Replies: 6
    • Views: 17,337
    03-08-2012, 05:37 AM Go to last post
  5. ANOVA with subject id's as variables?

    Hi everybody, I work in sleep research and it is usually of interest to us to compare variables between different sleep stages (wakefulness, N1,...

    Started by EnzoTaglia‎, 03-13-2012 05:10 PM
    • Replies: 6
    • Views: 2,559
    03-27-2012, 04:01 PM Go to last post
  6. Missing Data

    I used an original survey form to collect data and afterwards realized that the final copy of that survey included a question that was not on the...

    Started by ctphd2b‎, 03-20-2012 08:02 PM
    • Replies: 6
    • Views: 2,028
    03-21-2012, 09:22 PM Go to last post
  7. 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: 2,716
    04-03-2012, 05:20 AM Go to last post
  8. Determining which data set is most like another

    I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

    Started by EMStelley‎, 04-26-2012 12:23 PM
    chi-squared, multivariate data sets
    • Replies: 6
    • Views: 1,757
    04-27-2012, 02:08 PM Go to last post
  9. 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: 1,579
    05-15-2012, 02:14 AM Go to last post
  10. 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
  11. further causal analysis

    Hi All, So I did this analysis on a dataset by exploiting partial correlation matrix. I can see how the variables are related to each other and to...

    Started by viktus‎, 07-20-2012 06:17 AM
    • Replies: 6
    • Views: 1,810
    09-06-2012, 03:56 PM Go to last post
  12. Parametric / Non-parametric...

    Hi Everyone, I have a dataset that looks something like this: gene1, occurence in tissue 1 / condition A, 1 / B, 1 / C, 2 / A, 2 / B, 2 C....

    Started by ohara‎, 08-15-2012 11:21 AM
    • Replies: 6
    • Views: 2,366
    08-15-2012, 01:06 PM Go to last post
  13. Comparison of the power of the tests: Parametric test versus Non-parametric test

    How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric...

    Started by imjae2‎, 08-26-2012 11:09 AM
    monte carlo, non-parametric test, parametric, simulation, statistical power
    • Replies: 6
    • Views: 4,768
    08-26-2012, 04:23 PM Go to last post
  14. t-test or Mann-Whitney test, regular research problem, need help

    Hello, it looks like a most frequent research problem, but I am confused, so need help. I have 2 groups of data to compare: group 1 - people...

    Started by bondsergey‎, 10-08-2012 08:30 AM
    • Replies: 6
    • Views: 12,021
    10-09-2012, 06:01 AM Go to last post
  15. Missing Data Analysis Question

    Hi gurus, I really appreciate some advise on handling missing values. Briefly, subjects rated 21 objects (obj 1 ...obj 21) on 14 attributes...

    Started by statpuzz‎, 10-16-2012 03:51 PM
    efa, imputation, missing data analysis, split questionnaire, spss syntax
    • Replies: 6
    • Views: 2,009
    10-18-2012, 09:26 AM Go to last post
  16. How to test a hypothesis comparing two sets of likert item data

    Hi, I want to test a hypothesis but my two variables use likert item data and I don't know if they can be tested together. For example, Q1....

    Started by Sinead‎, 11-08-2012 02:15 AM
    • Replies: 6
    • Views: 2,857
    11-29-2012, 03:38 AM Go to last post
  17. Modeling Rate Of Arrival At An Event

    I'm trying to model the rate at which people arrive at a football match. I have throughput data from about 20 matches showing the number of people...

    Started by johnsayce‎, 11-24-2012 12:23 PM
    • Replies: 6
    • Views: 1,608
    11-27-2012, 11:51 AM Go to last post
  18. Average minute rating can be modeled by poisson?

    Dear All, Here is my question with an example. I am trying to understand the tv channel rating data. The data measures the tv watchers...

    Started by masarimk‎, 11-28-2012 11:13 AM
    • Replies: 6
    • Views: 1,174
    11-28-2012, 11:57 AM Go to last post
  19. Probability question for an archaeological case

    Hi Guys, I would appreciate to have help on the following. I have no extensive math background, so I can anticipate that I can only limit myself to...

    Started by gianmarco‎, 12-13-2012 11:49 AM
    • Replies: 6
    • Views: 1,499
    12-15-2012, 02:19 AM Go to last post
  20. 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: 2,567
    06-20-2013, 02:19 PM Go to last post
  21. LGC with Experimental Manipulations

    Hey gang, first time posting. So, I have 9 time points of continuous learning data for 200ish people. I also have two manipulations (thus the 200...

    Started by John.kostek‎, 12-13-2012 03:44 PM
    lgc modeling, lisrel, manipulations, sem
    • Replies: 6
    • Views: 1,800
    12-17-2012, 11:49 AM Go to last post
  22. Integrating two indices

    Hi, I've 2 series of indices for the years 2000-2013 with different ranges, One ranges from 70 to 100, while the other ranges from 196 to 306. If...

    Started by GIS‎, 04-18-2013 04:16 AM
    • Replies: 6
    • Views: 1,658
    04-21-2013, 08:26 PM Go to last post
  23. Correlation vs ANOVA

    Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

    Started by Bri‎, 01-23-2013 02:11 PM
    correlation analysis
    • Replies: 6
    • Views: 12,787
    01-23-2013, 04:18 PM Go to last post
  24. Which test to use for my data? Thanks

    Hi all, I have unequeal sample sizes so I am a little lost as to which test to use for my data. I have a total of 113 patients with one group being...

    Started by mrobert6‎, 04-15-2013 08:55 AM
    • Replies: 6
    • Views: 1,477
    04-16-2013, 07:27 AM Go to last post
  25. unbiased estimators

    in order to estimate the area of a squared field, two independent measures were taken of one of the sides: X1 and X2 two estimators were...

    Started by Yankel‎, 03-01-2013 04:19 PM
    • Replies: 6
    • Views: 2,257
    03-05-2013, 11:57 AM Go to last post
  26. Estimating likelihood of normal distribution mean shift after N samples

    First off, sorry if this post is in the wrong place. Please feel free to point me to the right place to post. The scenario is as follows: I have...

    Started by aut0pilot101‎, 06-11-2013 10:12 PM
    • Replies: 6
    • Views: 2,465
    06-12-2013, 10:39 AM Go to last post
  27. 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: 1,618
    07-29-2013, 03:23 PM Go to last post
  28. Can you estimate the power of a test by simulating data?

    I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

    Started by Disvengeance‎, 07-05-2013 05:48 PM
    • Replies: 6
    • Views: 1,643
    07-06-2013, 06:31 PM Go to last post
  29. Moderated Mediation Macro Limitations

    Hello! I am currently working on my thesis and my data seems to fit a moderated mediation model but I'm up against some of the MODMED limitations....

    Started by syzergy‎, 07-13-2013 04:48 PM
    • Replies: 6
    • Views: 3,119
    07-13-2013, 05:43 PM Go to last post
  30. two questionnaires correlation with a Likert-type scale

    Hello Imagine we want to know how much correlation is there between amount of stuff people buy and amount of that stuff which they consume? (its...

    Started by sevensea‎, 10-31-2013 01:51 PM
    • Replies: 6
    • Views: 9,185
    11-01-2013, 07:43 AM Go to last post
  31. Paramedic Research - Need help!

    Hello all, I have come across your forum after trying to source some statistic knowledge. I am currently planning a research project which I am...

    Started by davies2201‎, 12-07-2013 10:32 AM
    • Replies: 6
    • Views: 1,305
    12-08-2013, 11:26 AM Go to last post
  32. Which statistical test to use, 20 subjects, 6 categorical variable, 4 parameter

    Hi I have an experiment and are not sure which statistical test I should use. I hope some of you can help me, as this is not my strong side.. I...

    Started by KarstenDK‎, 02-05-2014 11:52 PM
    anova, experimental design
    • Replies: 6
    • Views: 1,626
    02-11-2014, 12:57 AM Go to last post
  33. Question 1 observation for control group & 3 obs for experimental group

    Hello, My background in statistics is quite limited, so I'm searching for help in order to choose which test I should use for my research. I am...

    Started by Pernelle‎, 03-05-2014 09:32 AM
    anova observations
    • Replies: 6
    • Views: 1,634
    03-11-2014, 03:05 PM Go to last post
  34. Meta-analysis: How should one handle non-significant studies containing no raw data?

    Let's say that I'm conducting a meta-analysis, looking at the performance of group A and group B with respect to a certain construct. Now, some of...

    Started by Speldosa‎, 03-25-2014 06:55 AM
    effect size, group differences, hypothesis testing, meta-analysis, power-analysis
    • Replies: 6
    • Views: 2,209
    03-26-2014, 08:22 AM Go to last post
  35. Any stats tests I can run to show inconsistency/ no correlation?

    Hi, I am doing my msc dissertation and I have gathered 204 responses to a questionnaire with one of the main questions being what exercises specific...

    Started by Gards79‎, 06-06-2014 12:11 PM
    • Replies: 6
    • Views: 1,605
    06-06-2014, 06:13 PM Go to last post
  36. Top AIC model with no significant parameter estimates

    Hello, I am working on a project in which my top model has normal looking standard errors, but all of the parameter estimates overlap zero,...

    Started by mikad‎, 07-23-2014 10:01 AM
    • Replies: 6
    • Views: 1,847
    07-24-2014, 08:23 AM Go to last post
  37. Having a hard time deciding on what test to use for data

    Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not...

    Started by NPS‎, 07-28-2014 09:37 AM
    large sample size, mann whitney
    • Replies: 6
    • Views: 1,873
    07-28-2014, 02:05 PM Go to last post
  38. GLMM - fitting random effects to a complex field design

    Dear forum users, Id be very grateful to hear about any opinions on a problem Im having with the random effects side of my generalised linear...

    Started by Mark Kusk‎, 08-02-2014 08:10 AM
    • Replies: 6
    • Views: 2,113
    08-03-2014, 05:07 AM Go to last post
  39. Significance aside - correlation coefficient

    Hi everyone: It's been a while since I have posted here and I hope that I am posting in the right forum. In my field, sometimes people like to...

    Started by blue11‎, 08-14-2014 02:38 PM
    • Replies: 6
    • Views: 1,697
    08-15-2014, 08:48 AM Go to last post
  40. Correlation between non-independent variables

    Hi, I want to conduct correlation between two variables, that have common term (difference scores). Originally there are three variables X, Y,...

    Started by random_guest‎, 09-17-2014 06:14 PM
    • Replies: 6
    • Views: 2,892
    09-24-2014, 11:15 AM Go to last post
  41. Relative Risk calculation

    Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

    Started by asaleh‎, 09-29-2014 06:27 AM
    • Replies: 6
    • Views: 2,744
    10-06-2014, 04:41 PM Go to last post
  42. Can anyone help me choose appropriate form(s) of analysis?

    Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

    Started by Kenny‎, 10-19-2014 12:05 PM
    • Replies: 6
    • Views: 2,789
    10-23-2014, 03:35 AM Go to last post
  43. Correct measure of central tendency for Skewed distribution

    Dear Talk Stats users, I am trying to solve following problem. I've got a data, which has a skewed distriubution (see attachment ) Now I can...

    Started by Namba‎, 10-30-2014 06:33 AM
    • Replies: 6
    • Views: 3,052
    10-30-2014, 11:26 AM Go to last post
  44. Post How to test data if it is normal distribution in spss ?

    Hello Good morning guys i will need some help truly i have variables in spss most of them scale type, some of them are nominal, and few are...

    Started by hanialbarni‎, 11-12-2014 11:29 PM
    distribution, graph, normal, problem formulation, spss
    • Replies: 6
    • Views: 3,148
    11-18-2014, 03:01 AM Go to last post
  45. Basic ANOVA question

    We had individuals fill out a survey where they assign importance to five categories. So for example: if given $1000 to distribute among five...

    Started by singerjr‎, 11-18-2014 09:05 AM
    • Replies: 6
    • Views: 2,220
    11-18-2014, 05:22 PM 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: 2,933
    11-28-2014, 08:13 PM Go to last post
  47. Question Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

    Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

    Started by Eaners‎, 01-27-2015 10:22 PM
    cronbach's alpha, likert scale analysis, pretest
    • Replies: 6
    • Views: 1,558
    01-28-2015, 02:46 PM Go to last post
  48. Raw Data vs Frequency Distribution

    Hi, I am new here, please discuss this given below. Why an average computed from a frequency distribution is not exactly the same as...

    Started by Anum‎, 05-09-2015 07:44 AM
    • Replies: 6
    • Views: 5,925
    05-11-2015, 07:48 AM Go to last post
  49. Statistical Analysis for Master's Thesis

    Hello Everyone, So this is my first forum post ever :) probably because I just couldn't figure out solution by myself this time. Thank you in...

    Started by may_survey‎, 08-14-2015 06:24 PM
    multinomial, thesis
    • Replies: 6
    • Views: 1,784
    08-18-2015, 06:34 PM Go to last post
  50. Critiques Requested on Resampling as an Approach

    I found an old piece code I wrote. I had a logistic model with a multiplicative interaction term consisting of two binary variables plus model...

    Started by hlsmith‎, 10-22-2015 09:50 AM
    • Replies: 6
    • Views: 1,775
    10-22-2015, 03:23 PM Go to last post
  51. Various Statistical Methods and their Functioning

    Hey everyone! I had a few questions regarding certain statistical methods I am researching. I've found a peer-reviewed journal article dealing...

    Started by Bananas‎, 10-28-2015 02:35 PM
    • Replies: 6
    • Views: 1,676
    11-09-2015, 06:36 PM Go to last post
  52. Census data: Should I worry about sample size and pvalues?

    Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

    Started by Marvin85‎, 06-03-2016 03:51 PM
    census data, logistic, sample size, statistical power
    • Replies: 6
    • Views: 1,601
    06-07-2016, 08:22 AM Go to last post
  53. Population Estimation

    Hello, new member here and I've been looking for a way to make a number cruncher for a (imaginary) colony of creatures for an RP I'm making. I'm...

    Started by ravni‎, 06-15-2016 07:59 AM
    population modeling, population statistics
    • Replies: 6
    • Views: 2,382
    06-16-2016, 08:05 AM Go to last post
  54. Estimating the number of cases (sample size)

    Hi there! I've a perhaps simple question: how can I estimate the number of measurements (cases) to obtain a accurate result? Here an example:...

    Started by unknown‎, 07-17-2016 08:10 AM
    • Replies: 6
    • Views: 1,390
    07-17-2016, 11:00 PM Go to last post
  55. Question Is it right to estimate the mean of scores obtained from Factor Analysis?

    Hi Everyone :) I appreciate any comment about this question: Does it make sense to use the score obtained from a factor analysis to estimate the...

    Started by IsaMolly‎, 07-24-2016 09:48 PM
    • Replies: 6
    • Views: 1,963
    08-02-2016, 02:44 AM Go to last post
  56. Generalised Lambda Distribution

    Hello, Can anyone help me, I am trying to use the Generalized Lambda distribution to model some parts in an assembly, but apart from Wikipedia...

    Started by GG1234‎, 10-02-2017 02:47 AM
    generalised, gld, lambda
    • Replies: 6
    • Views: 254
    10-17-2017, 01:33 PM Go to last post
  57. finding quantiles

    how do you find the quantile of a single number in a distribution in R? input: number output: percentage THank you!

    Started by sleck‎, 07-31-2008 10:42 AM
    • Replies: 5
    • Views: 7,505
    07-31-2008, 04:08 PM Go to last post
  58. DOE for Logistic Regression

    Hello- Does anyone have any references for DOE (especially multivariate testing / Taguchi) for binary response variables (analyzing with Logistic...

    Started by B_Miner‎, 08-28-2008 09:31 AM
    • Replies: 5
    • Views: 4,226
    08-28-2008, 11:18 AM Go to last post
  59. simple regression question (I think)

    Hi there, Suppose I have the simple libear regression model: Y=a0+a1*X+ε where ε~N(0,σ^2) Suppose that via least squares I estimate a0...

    Started by leo nidas‎, 09-24-2008 07:19 AM
    • Replies: 5
    • Views: 3,836
    09-24-2008, 02:35 PM Go to last post
  60. Exclamation Are scores significantly different to a neutral response? Please help...

    Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

    Started by gemma7‎, 10-05-2008 07:28 AM
    • Replies: 5
    • Views: 6,511
    10-06-2008, 07:40 PM Go to last post

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