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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: 18,728
    10-11-2014, 12:02 PM Go to last post
  1. Multinomial logistic regression

    I have been carrying out some analysis using multinomial logistic regression and I would like to compare two competing models to see which is the...

    Started by josie‎, 06-27-2008 09:44 AM
    • Replies: 2
    • Views: 3,962
    06-29-2008, 08:07 AM Go to last post
  2. Unhappy Requesting Jenks natural breaks algorithm for Statistica

    Hello forum, I am studying particle size distributions and have been advised to locate an R algorithm/routine to implement Jenks natural breaks...

    Started by Robertmacdonald‎, 10-05-2010 08:33 AM
    • Replies: 1
    • Views: 3,960
    10-21-2010, 04:52 PM Go to last post
  3. Interpreting the interaction effect in a well known paper

    Attached you will find a well known research paper. If you go to page 438 (page 9 of the pdf file) you will find a model where: change in tax rate...

    Started by 12345678‎, 12-30-2016 04:25 PM
    • Replies: 5
    • Views: 3,957
    01-01-2017, 01:40 PM Go to last post
  4. Likert scale analysis

    Hi all! I want to ask that i have likert scale questionnaire with 6 points scale. If i am going to analyze using as interval data, that means i have...

    Started by hepymoon‎, 02-15-2011 08:13 AM
    • Replies: 0
    • Views: 3,945
    02-15-2011, 08:13 AM Go to last post
  5. Comparing distributions

    I'm working on analyzing data for a prof for publication and have come to a situation that I am lacking confidence in and am coming here for help. ...

    Started by trinker‎, 03-02-2012 03:54 PM
    • Replies: 12
    • Views: 3,940
    05-21-2012, 10:28 AM Go to last post
  6. Post Which test to use for my data

    Hi, I am not sure which kind of test to use to analyse my data. Can anyone help? I collected 50 snails from 5 different sites & dissected to find...

    Started by palmer86‎, 04-09-2013 08:51 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 3,936
    04-22-2013, 02:07 AM Go to last post
  7. Need help with Multiple Imputations ("pooled" dataset)

    Hello everybody, My original data set (n=901) contains missing values (10-20% per variable). I am applying Multiple Imputations technique using...

    Started by kiton‎, 06-20-2014 11:39 AM
    • Replies: 8
    • Views: 3,934
    06-23-2014, 02:07 PM Go to last post
  8. Question: making a positive case for "no effect"

    I have the results of a basic web-based marketing test. Visitors were randomly sent to one of several pages with a binary outcome of "sale" or "no...

    Started by dwilson‎, 10-21-2009 05:10 PM
    • Replies: 7
    • Views: 3,933
    10-26-2009, 03:23 PM Go to last post
  9. Comparing two distributions using random drawing.

    Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

    Started by ThomasAG‎, 03-07-2010 03:59 PM
    • Replies: 7
    • Views: 3,930
    09-18-2011, 08:11 AM Go to last post
  10. 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: 3,930
    04-12-2011, 10:59 PM Go to last post
  11. Principal components interpretation

    I have principal components based on correlation matrix. Statistica PCA method report outputs not only factor loadings that depend on components'...

    Started by kobylkinks‎, 10-15-2008 12:34 AM
    • Replies: 5
    • Views: 3,929
    10-24-2008, 04:26 AM Go to last post
  12. Factor Analysis help--Senior Thesis

    I am an undergraduate and working on my senior research project. I am doing a study of the construct validity of a critical thinking test using...

    Started by nswillie‎, 11-20-2008 12:31 PM
    • Replies: 2
    • Views: 3,929
    11-30-2008, 07:50 AM Go to last post
  13. normalization for detection of outliers

    Hello everyone, I am working with a huge dataset and I'm trying to find outliers in each row for two subgroups of my dataset (G1 and G2)....

    Started by bontus‎, 10-20-2011 08:59 AM
    • Replies: 0
    • Views: 3,926
    10-20-2011, 08:59 AM Go to last post
  14. Linear regression using compositional data as independent variables

    I have a set of ratios that the sum results in 100% (compositional data in other words). These 7 variables need to be implemented in a linear...

    Started by micdhack‎, 03-24-2013 11:49 AM
    • Replies: 2
    • Views: 3,923
    03-07-2014, 12:04 PM Go to last post
  15. Comparing the mean of top and bottom quartiles

    Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

    Started by lolozgor‎, 02-08-2012 12:26 AM
    quartile, t-test
    • Replies: 2
    • Views: 3,907
    02-08-2012, 12:45 AM Go to last post
  16. Ideas with paired data

    Yesterday I was lucky enough to work with a statistician from another section in my division. He took me along on one of the consultations he...

    Started by bryangoodrich‎, 08-31-2011 12:17 PM
    • Replies: 5
    • Views: 3,906
    08-31-2011, 04:45 PM Go to last post
  17. Help needed with Multiple Correspondence Analysis

    Greetings, I am looking for resources (books, websites, articles) that can help me, in the simplest way possible (i.e. step by step), figure out...

    Started by rhazlettknudsen‎, 07-05-2011 04:08 PM
    • Replies: 2
    • Views: 3,904
    07-05-2011, 06:54 PM Go to last post
  18. Regression Model

    wefwefwfweff

    Started by fhaquassho‎, 06-03-2010 06:07 PM
    • Replies: 3
    • Views: 3,903
    06-04-2010, 09:04 AM Go to last post
  19. Question F-value and Post-hoc tests conflict

    What does it mean when you obtain a significant F-value for an ANOVA but when you perform the post-hoc test no pairwise comparisons are significant?...

    Started by mathgeek10‎, 07-17-2009 02:40 PM
    • Replies: 0
    • Views: 3,890
    07-17-2009, 02:40 PM Go to last post
  20. Exclamation Probability Mass Functions

    I am having some trouble on understanding some problems on my practice exam. The prompt is: Let X1 and X2 have (the same) probability mass...

    Started by creative22‎, 10-12-2011 05:50 PM
    mass function, probability, random variable
    • Replies: 1
    • Views: 3,889
    10-12-2011, 10:53 PM Go to last post
  21. "Uninformative" priors paradox?

    Bayesians, puzzle me this: If you are trying to learn the $p$ parameter of a binomial distribution, the least informative prior is the uniform...

    Started by serapio‎, 10-16-2010 10:15 PM
    • Replies: 1
    • Views: 3,886
    10-21-2010, 10:55 PM Go to last post
  22. Minimum sample for a t-test independent samples

    I have a sample which consists of 2 treatments and 15 unique samples. Data are interval. It was obtained by measuring arguments in similar pages from...

    Started by micdhack‎, 12-30-2011 06:24 AM
    • Replies: 5
    • Views: 3,881
    12-30-2011, 11:59 AM Go to last post
  23. Question [SOLVED] Option for post-hoc test after permanova for community data?

    Hi there, Thank you for reading my post and hopefully someone can provide me with some help! For my master's thesis, I have used microbial...

    Started by Bob3‎, 02-15-2016 07:21 AM
    community, permanova, post-hoc
    • Replies: 3
    • Views: 3,877
    02-24-2016, 08:58 PM Go to last post
  24. variables that are not independent of each other

    What are some ways this dependency is modeled with statistical methods?

    Started by Outlier‎, 07-16-2010 03:12 PM
    • Replies: 5
    • Views: 3,874
    07-16-2010, 05:03 PM Go to last post
  25. Estimation Maximization

    Hello everybody! I have a general question concerning Estimation Maximization (EM): I understand from literature research, that EM is not possible...

    Started by therp‎, 11-17-2013 07:09 AM
    • Replies: 3
    • Views: 3,873
    11-18-2013, 05:19 AM Go to last post
  26. Time series: Research paper - VAR modeling

    Hi everyone, I am conducting a statistical research using VAR modeling. So my plan is to conduct a 4-variable VAR(2) on the following: 1)...

    Started by E574‎, 05-21-2011 10:09 AM
    • Replies: 0
    • Views: 3,864
    05-21-2011, 10:09 AM Go to last post
  27. How to classify data into group?

    I have collected warehousing cost data from 200 companies...and then converted to % There are 200 data (lowest from 1.5 % to highest of 40 %). My...

    Started by satha13‎, 05-23-2012 07:19 AM
    • Replies: 5
    • Views: 3,860
    06-05-2012, 07:54 AM Go to last post
  28. Spearman's Rank Correlation P value on Minitab

    Hi there, im doing a project on the relationship between plant height and their nearest neighbour. As i couldn't normalise the data i've opted to use...

    Started by Debaser‎, 02-29-2012 08:50 AM
    minitab, p value, spearman's rank
    • Replies: 0
    • Views: 3,859
    02-29-2012, 08:50 AM Go to last post
  29. Combining outcome scores: standardising case and control data

    Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

    Started by JG28‎, 09-05-2010 08:02 PM
    • Replies: 0
    • Views: 3,852
    09-05-2010, 08:02 PM Go to last post
  30. Which tests do I have to use in order to test my hypotheses?

    Dear sir/madam, I would like to test these hypotheses, but I'm still not sure which test I should use for it. Can anybody help me? Thanks...

    Started by Nadia1908‎, 10-29-2012 10:27 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 3,849
    11-01-2012, 01:09 PM Go to last post
  31. Using chi-squared test for goodness of fit for different sizes of sample?

    Firstly, apologies if I'm posting this in completely the wrong place. I'm trying to figure out a way to allow for different sized samples when...

    Started by HelenW‎, 10-28-2011 02:26 PM
    chi-square, chi-squared
    • Replies: 1
    • Views: 3,842
    10-28-2011, 03:34 PM Go to last post
  32. Can you assign new observations into existing clusters?

    Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

    Started by jawon‎, 07-01-2014 04:37 PM
    • Replies: 5
    • Views: 3,837
    07-07-2014, 03:45 PM Go to last post
  33. Violation of sphericity...

    If you seem to be violating the assumption of sphericity when undertaking several separate one way repeated-measures ANOVAs and therefore have to...

    Started by nogoodatstats‎, 08-20-2009 03:26 PM
    • Replies: 0
    • Views: 3,831
    08-20-2009, 03:26 PM Go to last post
  34. 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: 3,829
    09-24-2008, 02:35 PM Go to last post
  35. Common method variance

    Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

    Started by john_cappa‎, 03-01-2011 10:43 AM
    • Replies: 2
    • Views: 3,822
    03-03-2011, 08:52 PM Go to last post
  36. Homogeneity assumption mixed ANOVA

    For my research I did a mixed ANOVA. The homogeneity assumption was violated. However, I learned that this is only a problem when the group sizes...

    Started by Pluzan‎, 07-20-2013 06:37 AM
    • Replies: 9
    • Views: 3,819
    08-09-2013, 12:37 PM Go to last post
  37. Help with inter-rater reliability

    Hi all, I've got a set of data that I need some advice on. I'm working on a pilot project where a group of four people evaluate essays. The way that...

    Started by Blank‎, 09-05-2012 02:17 PM
    reliability
    • Replies: 14
    • Views: 3,812
    09-07-2012, 05:13 PM Go to last post
  38. Joint Probability From Correlation Function

    Dear all I have the following problem. Given a set of correlated binary variables, can I determine the joint probability from the correlation...

    Started by torkel‎, 03-23-2010 12:49 PM
    • Replies: 3
    • Views: 3,797
    07-18-2013, 03:14 AM Go to last post
  39. How to get p-value with categorical dependent var and nominal independent var

    Hi, I'm familiar with most of the univariate tests for significance (chi-square, t-test, 1-way anova, etc.) but I was stumped today. Which test do...

    Started by BME_Guy‎, 07-19-2011 08:25 PM
    • Replies: 1
    • Views: 3,797
    07-19-2011, 08:37 PM Go to last post
  40. Weighting by sample size/confidence intervals in regression analysis?

    Hello, I am conducting an analysis of how a gene frequency (technically allele frequency) correlates with certain ecological variables (mainly...

    Started by dtae‎, 07-24-2008 10:33 PM
    • Replies: 0
    • Views: 3,793
    07-24-2008, 10:33 PM Go to last post
  41. Using Linear slope estimate as independent variable in regression analysis

    Hi all, I am doing an analysis of longitudinal growth data and would like to compare my methods to other studies but am having trouble finding...

    Started by rrsterling‎, 07-15-2009 01:01 AM
    • Replies: 0
    • Views: 3,793
    07-15-2009, 01:01 AM Go to last post
  42. Subsampling to obtain a p-value

    Hello everybody! This is my first post in this forum, I hope you guys have some ideas for me :) I have ~2000 measurements, namely angles, which...

    Started by luciferin‎, 09-22-2011 09:33 AM
    • Replies: 5
    • Views: 3,792
    10-07-2011, 12:57 PM Go to last post
  43. Significant Difference with 2 vars

    Hi everyone, Is it at all possible to determine if a group of points on a scatterplot are significantly different from another group of points? ...

    Started by harryema‎, 06-24-2010 07:04 PM
    • Replies: 7
    • Views: 3,783
    06-25-2010, 11:03 AM Go to last post
  44. what is the difference between latent class analysis and factor analysis?

    I read some papers and most of them used EFA/SEM, and one paper used LCA (latent class analysis). So, when do you need to use LCA but not FA? It...

    Started by fengyuwuzu‎, 06-22-2015 02:49 PM
    • Replies: 2
    • Views: 3,781
    06-22-2015, 05:04 PM Go to last post
  45. ANOVA of factor analysis results

    Hello, new to the forum, and I'm in a bit of a bind with some data analysis for my thesis. I have conducted Principle Axis Factoring (using SPSS,...

    Started by dalsauks‎, 02-01-2011 12:39 AM
    • Replies: 0
    • Views: 3,777
    02-01-2011, 12:39 AM Go to last post
  46. Office for National Statistics YouTube channel

    The Office for National Statistics has recently launched a new YouTube channel explaining some of the stories about their statistics. Its a new...

    Started by Jamie Jenkins‎, 03-03-2011 05:31 PM
    • Replies: 0
    • Views: 3,772
    03-03-2011, 05:31 PM Go to last post
  47. statistical power of a General Linear Mixed Model with repeated measurements

    Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

    Started by alstublieft‎, 04-15-2009 07:37 AM
    • Replies: 0
    • Views: 3,771
    04-15-2009, 07:37 AM Go to last post
  48. Finding relationship between 2 curves over time

    Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

    Started by ehestigoni‎, 03-08-2009 05:49 PM
    • Replies: 1
    • Views: 3,770
    03-11-2009, 05:40 PM Go to last post
  49. Interpretation of Factor Analysis

    I have a doubt on how to interpret the factor score output? Suppose we have data in 7 columns: Recommendation, Preference, Willingness to pay...

    Started by bsaikrishna‎, 01-30-2011 08:46 AM
    • Replies: 0
    • Views: 3,768
    01-30-2011, 08:46 AM Go to last post
  50. Question Identify the causes for a phenomenon

    Hi everyone. I would like to investigate the relationship of different factors to a phenomenon. Saying I have traffic accidents (1 or 0) with...

    Started by garybooz‎, 11-26-2013 08:39 PM
    factors, significance
    • Replies: 0
    • Views: 3,766
    11-26-2013, 08:39 PM Go to last post
  51. Scaling technique

    A friend of mine, a Ph.D. student, seeks my advice on the appropriate scaling technique that can be used for his research. The research involves...

    Started by Dr.Appalayya‎, 03-25-2009 04:10 AM
    • Replies: 0
    • Views: 3,762
    03-25-2009, 04:10 AM Go to last post
  52. might be a stupid question...

    I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

    Started by zxcvbnm‎, 03-15-2009 01:18 PM
    • Replies: 2
    • Views: 3,755
    03-16-2009, 11:07 AM Go to last post
  53. single Likert scale question analysis

    I work for a holiday company which uses a 7 grade Likert scale questionnaire to collect feedback from our guests. This is my first foray into...

    Started by Percepto‎, 09-02-2011 05:41 PM
    analysis, average., evaluate, likert, ordinal
    • Replies: 2
    • Views: 3,751
    09-08-2011, 03:57 AM Go to last post
  54. Methodology For Sports Statistics Projections

    Good day! I am new to statistics and I want to try my hand at creating sports statistics projections. I'm posting in this thread because my first...

    Started by mightyeskimo‎, 03-05-2012 02:22 PM
    • Replies: 7
    • Views: 3,751
    03-07-2012, 01:08 PM Go to last post
  55. survey weighting and calculation of confidence intervals for proportions

    Hi all I'm working with data from a one-off cross-sectional random sample survey that has weighting that can be applied to make it representative...

    Started by zingbar‎, 08-07-2012 04:20 PM
    • Replies: 0
    • Views: 3,750
    08-07-2012, 04:20 PM Go to last post
  56. On the history of MANOVA's null hypothesis...

    hey everyone! this is kind of a different topic from the "how-to-analyze-my-data" questions, but i think it's kind of relevant. anyways, so my...

    Started by spunky‎, 01-30-2011 09:15 PM
    manova, multivariate analysis, null hypothesis
    • Replies: 0
    • Views: 3,742
    01-30-2011, 09:15 PM Go to last post
  57. Power calculation in Critiquing Tool

    Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely...

    Started by Roogle‎, 12-29-2011 06:03 PM
    alpha, calculation, critique, power, sample
    • Replies: 1
    • Views: 3,742
    02-13-2012, 02:20 PM Go to last post
  58. Power analysis 1-sided vs 2-sided

    I'm curious how power analysis changes when you go from a 2-sided test to a 1-sided test. If in both cases I keep my alpha at .05, my effect size and...

    Started by biostatsmia‎, 01-27-2011 04:20 PM
    • Replies: 0
    • Views: 3,722
    01-27-2011, 04:20 PM Go to last post
  59. Probability of Events in Equations

    Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

    Started by mjgarrin‎, 12-09-2016 09:20 AM
    • Replies: 3
    • Views: 3,722
    12-12-2016, 09:48 AM Go to last post
  60. One sample t-test: help needed

    Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

    Started by scrap‎, 11-15-2010 12:30 PM
    • Replies: 8
    • Views: 3,720
    11-22-2010, 08:42 AM Go to last post

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