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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: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. Is this method to post-hoc determine the sample size a known one?

    Hi all! In the last weeks I'm facing the issue of determining if my sample is big enough to describe the world population. Apart from the usual...

    Started by ale_tuz‎, 05-05-2014 02:39 AM
    • Replies: 3
    • Views: 1,817
    12-12-2014, 08:16 AM Go to last post
  2. how to analyse samples with different distribution?

    I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

    Started by jaisysamuel‎, 06-15-2014 04:31 AM
    • Replies: 3
    • Views: 1,737
    06-20-2014, 07:33 PM Go to last post
  3. Nonparametric statistical significance test for largely skewed count data

    My research design looks as follows: an experimental game with 4 participants (human subjects), repeated for 20 rounds. During each round,...

    Started by ardelia‎, 07-04-2014 06:12 AM
    • Replies: 3
    • Views: 1,094
    07-04-2014, 08:03 AM Go to last post
  4. Sample Size Calculation for Kruskal Wallis test

    Sorry if posted in wrong forum As the title says it all, how to calculate a sample size for KW test? I'm a bit of a beginner here, should we just...

    Started by Logician‎, 07-07-2014 10:20 AM
    • Replies: 3
    • Views: 4,276
    07-08-2014, 12:13 AM Go to last post
  5. how to calculate SD or SEM of ratios?

    I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

    Started by huimeizheng‎, 07-09-2014 01:33 AM
    • Replies: 3
    • Views: 2,880
    07-10-2014, 08:34 AM Go to last post
  6. Comparing time curves for two groups in research.

    Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

    Started by bondsergey‎, 07-25-2014 08:27 AM
    statistical research
    • Replies: 3
    • Views: 1,691
    07-25-2014, 11:45 AM Go to last post
  7. MANOVA versus t-tests : unconsistent results

    Hi, here is my problem. I am trying to compare the change on a language measure from time 1 to time 2 between 2 groups. If i do a repeated...

    Started by maxmon89‎, 07-27-2014 02:38 PM
    • Replies: 3
    • Views: 1,914
    07-29-2014, 12:48 AM Go to last post
  8. Not sure what to do with data

    Hello, i spent a very long time gathering data and now i need to write a paper about it. Unfortunately, i'm relatively new to statistical...

    Started by soylentgreen‎, 07-28-2014 03:09 PM
    • Replies: 3
    • Views: 1,135
    07-29-2014, 07:36 AM Go to last post
  9. What kind of ANOVA is good for this

    Hello, In my research i've collected death % for cell cultures. One variable was the treatment used (0,2,4,10,16 exposure). Another one was the...

    Started by Blakey85‎, 08-16-2014 03:22 PM
    • Replies: 3
    • Views: 2,607
    08-17-2014, 01:53 PM Go to last post
  10. SEM Confidence Intervals and Repeated Measures

    I'm analysing data from a repeated measures study. All of my stats tests (ANOVA and non-parametric tests where appropriate) are telling me that the...

    Started by dumdeedum‎, 07-31-2014 01:19 PM
    • Replies: 3
    • Views: 1,747
    08-03-2014, 06:43 PM Go to last post
  11. Standardizing non-normally distributed data?

    Hi everyone, I'm working on a project at the moment that aims to compare subjects based on different characteristics. At the moment, I am looking...

    Started by Londoner‎, 08-13-2014 04:32 AM
    • Replies: 3
    • Views: 3,326
    08-13-2014, 10:57 AM Go to last post
  12. Stores and ordered rank of products

    I have data about popularity of some products in some stores. For each of the stores I have only a ordered rank of best-selling products in them. I...

    Started by George P‎, 08-16-2014 12:21 PM
    data analysis, nonparametric statistics, ordered, ranks, test to use
    • Replies: 3
    • Views: 1,308
    08-16-2014, 08:34 PM Go to last post
  13. Is this variable ordinal or categorical - which test?

    Hi, I'm not sure if this variable classifies as an ordinal or categorical DV, due to this issue I'm havign and therefore, I'm unsure which stats...

    Started by Fran2014‎, 08-29-2014 10:07 AM
    ordinal categorical test
    • Replies: 3
    • Views: 1,882
    08-29-2014, 11:22 AM Go to last post
  14. Mann-Whitney Test

    Hi all, I've got some data that contains dichotomous independent variables and ordinal dependent variables. As a result, I think the only test...

    Started by Templean‎, 08-30-2014 02:10 PM
    • Replies: 3
    • Views: 1,709
    08-30-2014, 04:58 PM Go to last post
  15. Degrees of freedom for Chi2 normality test

    I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a...

    Started by Riccardo‎, 09-01-2014 04:31 PM
    chi square, chi square test, degrees of freedom, normality test
    • Replies: 3
    • Views: 2,870
    09-02-2014, 12:49 AM Go to last post
  16. non parametric multiple comparison

    Hello I am doing statistical analysis on my research data and the data is not normal. So I used Kruskal Wallis test for finding whether treatments...

    Started by rzs0034‎, 09-22-2014 11:08 AM
    • Replies: 3
    • Views: 3,426
    09-23-2014, 01:27 AM Go to last post
  17. Chi-square influential categories

    I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

    Started by bioniclime‎, 10-27-2014 12:05 PM
    chi-square test, influence
    • Replies: 3
    • Views: 1,643
    10-27-2014, 03:55 PM Go to last post
  18. statistical analysis at the regional level

    Hi I wanted to run multivariate analysis on data from regional level (i.e. regional population size, regional indicator values, regional equity...

    Started by proc1125‎, 11-18-2014 01:31 PM
    • Replies: 3
    • Views: 1,989
    11-19-2014, 10:43 AM Go to last post
  19. Post What should i do after factor analysis output ?

    Hello, I am having a construct name trust that includes the following constructs: 1 - Benevolence ( 3 Items) 2 - Integrity ( 6 Items ) 3 -...

    Started by hanialbarni‎, 11-19-2014 10:11 AM
    • Replies: 3
    • Views: 3,186
    11-20-2014, 09:10 PM Go to last post
  20. Pseudoreplication for my PhD Thesis: any advices?

    Hello to everybody, that's my first post in the forum. :wave: I apologize for i) my bad english and ii) for the lenght of the post :rolleyes: ...

    Started by Muzzé‎, 12-27-2014 04:26 AM
    • Replies: 3
    • Views: 1,741
    01-04-2015, 09:06 PM Go to last post
  21. noramlization

    I weighted the variables to do structural equation modeling (SEM). I found that some weighted variables were not normally distributed. Do I have to...

    Started by eunkum‎, 01-08-2015 02:06 PM
    normalization
    • Replies: 3
    • Views: 1,493
    01-10-2015, 01:07 AM Go to last post
  22. This might be a simple statistics question, or a really odd statistics question.

    I am not a statistics person, so I am not sure if this is a statistics type question or a question that has an answer. I am not sure how best to...

    Started by simpleton‎, 01-11-2015 09:58 AM
    • Replies: 3
    • Views: 2,358
    01-11-2015, 03:40 PM Go to last post
  23. Comparing Likert items. What test should I use?

    Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

    Started by RDW‎, 01-23-2015 09:09 AM
    • Replies: 3
    • Views: 1,683
    01-24-2015, 07:59 AM Go to last post
  24. General Term for Models with Dependend and Independend Variables

    Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

    Started by consuli‎, 01-24-2015 09:42 AM
    • Replies: 3
    • Views: 2,419
    01-26-2015, 06:44 AM Go to last post
  25. Can Factor Analysis be used for non normal distribution ?

    Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

    Started by CAShobana‎, 03-31-2015 11:28 PM
    • Replies: 3
    • Views: 1,617
    04-01-2015, 12:43 PM Go to last post
  26. single function of two gaussian distributed variables..

    Hi Folks, I have a two 2 dimenstional gaussian function of variables x and y and of their respective standard deviations. I have single valued...

    Started by Farzad‎, 03-28-2015 12:48 PM
    • Replies: 3
    • Views: 1,309
    03-29-2015, 05:48 AM Go to last post
  27. Ordinal Regression vs Spearmans Rank Correlation

    Hello, My name is William, I am currently at my last year at Newcastle University, UK carrying out research for my dissertation on how social...

    Started by wberner11‎, 04-01-2015 05:45 AM
    dissertation, regression analysis, spearmans rank
    • Replies: 3
    • Views: 2,701
    04-01-2015, 06:44 AM Go to last post
  28. equal/unequal sample sizes

    I have recently sent a paper on aflatoxin levels in nuts for publishing. The aim of the study was to analyze a total amount of 106 nuts. The nuts...

    Started by ivn‎, 02-09-2015 02:17 PM
    • Replies: 3
    • Views: 2,136
    02-09-2015, 03:20 PM Go to last post
  29. Question Choosing an appropriate test: MANOVA? ANCOVA? Something else?

    I am performing a "dry run" statistical analysis on my dissertation data pretest, and I'm looking for a little guidance regarding the specific...

    Started by Eaners‎, 02-13-2015 02:50 AM
    continuous variable, interaction, statistical analysis
    • Replies: 3
    • Views: 1,700
    02-18-2015, 04:15 PM Go to last post
  30. need help desperatly: which test to choose

    Hi everyone, I need your help :confused: I would like to compare the monthly income composition of people between two countries. The monthly income...

    Started by kodie‎, 04-04-2015 03:45 PM
    • Replies: 3
    • Views: 1,400
    04-05-2015, 06:02 AM Go to last post
  31. Logistic or OLS Regression?

    I am new to statistics and learning a bit about regression and logistic "regression." The dependent variable for my data set is whether a sports...

    Started by WC4J‎, 06-10-2015 11:36 AM
    • Replies: 3
    • Views: 1,417
    06-11-2015, 09:07 AM Go to last post
  32. Sample size in equivalence trial?

    Hey all, For my thesis I need to calculate the sample size for an equivalence trial with four groups (the score on four equivalent forms in order...

    Started by merisslian‎, 06-12-2015 06:10 AM
    anova, equivalence, equivalence trial, sample size
    • Replies: 3
    • Views: 1,637
    06-12-2015, 10:21 AM Go to last post
  33. 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: 2,117
    07-29-2015, 03:10 AM Go to last post
  34. Transformation of panel count variables with multitude of zero values

    Hello dear forum members! For a panel of 1,700 physicians observed from 2009 to 2013, my data includes two variables -- number of favorable(fav)...

    Started by kiton‎, 07-19-2015 02:58 PM
    • Replies: 3
    • Views: 1,842
    07-20-2015, 04:05 PM Go to last post
  35. Research Study

    Hello everyone, I would like to ask for help regarding my YES/No Survey. Could somebody me how to compute for this. thanks!!:):):)

    Started by yav‎, 08-06-2015 03:19 AM
    • Replies: 3
    • Views: 1,647
    08-06-2015, 07:50 AM Go to last post
  36. Factorial experiment in CRD with unequal replications

    Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say...

    Started by skyakash‎, 03-17-2016 12:03 PM
    anova, crd, design of experiments, factorial analysis, unequal replications
    • Replies: 3
    • Views: 1,514
    03-18-2016, 06:59 AM Go to last post
  37. Agreement between studies- which test is appropriate?

    I'm not using questionnaire. I need to find the agreement between previous studies on the elements of sustainability practice in campus. I'm applying...

    Started by fariha‎, 09-29-2015 02:28 AM
    • Replies: 3
    • Views: 1,312
    10-01-2015, 02:33 AM Go to last post
  38. ANOVA - which one to use?

    Hello, we are doing an experiment where body consistence (weight, proportion of muscles, fat, water in body etc.) is measured. We have 103...

    Started by KatkaK‎, 10-24-2015 05:32 PM
    anova
    • Replies: 3
    • Views: 1,631
    10-28-2015, 02:38 AM Go to last post
  39. statistical test confius

    hii... any one need to help me... currently im doing research about pollution.. can any one suggest what test can i do since i using questinnaire...

    Started by daus90‎, 11-05-2015 10:42 AM
    • Replies: 3
    • Views: 1,343
    11-06-2015, 06:33 PM Go to last post
  40. Which Test for Comparing a Group Pre and Post

    A group of people have participated in a program That group of people have completed a questionnaire pre and post program Because it is a...

    Started by Joelymac‎, 11-08-2015 12:35 PM
    • Replies: 3
    • Views: 1,852
    12-18-2015, 07:30 PM Go to last post
  41. MSE in GLM ANOVA

    Sorry for the wall of text, but I'm trying to figure out how to proceed and feel as though I need to clue you in as best I can. Experimental...

    Started by elduderino260‎, 11-16-2015 08:20 PM
    • Replies: 3
    • Views: 1,280
    11-17-2015, 01:29 PM Go to last post
  42. Exclamation Sample Size Selection

    Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

    Started by Bird1990‎, 12-12-2015 12:33 PM
    • Replies: 3
    • Views: 2,003
    12-12-2015, 09:28 PM Go to last post
  43. 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: 1,370
    12-30-2015, 11:51 AM Go to last post
  44. How to calculate sample size and effect size for comparing means from two groups

    Hi all, hoping i can find some answers here for a bit of a problem i am having regarding a sample size calculation for a study I am soon to conduct. ...

    Started by Damo123‎, 01-25-2016 08:14 PM
    comparing means, effect size, sample size calculation
    • Replies: 3
    • Views: 1,508
    01-31-2016, 03:09 AM Go to last post
  45. Cool Definition of deflated

    Hello guys Do you know what do they mean by "deflated" in the following sentence? "firms reported goodwill impairment loss ( expressed as...

    Started by Lisa92‎, 02-13-2016 04:58 PM
    • Replies: 3
    • Views: 1,936
    02-13-2016, 08:13 PM Go to last post
  46. 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: 3,834
    02-24-2016, 08:58 PM Go to last post
  47. binary forcasting

    Hello My data in a binary form a one-hour period for 90 days. 0=Not happened 1= happended I wanna to forcasting these data ,and i dont know what...

    Started by aminabdolahnejad‎, 02-16-2016 01:52 PM
    • Replies: 3
    • Views: 1,496
    02-20-2016, 03:08 PM Go to last post
  48. Reliability and Validity

    Hi every body am conducting an educational research, and I've been asked to use statistics in my research!! I used a test in a pre and post...

    Started by rukia‎, 02-20-2016 02:43 PM
    • Replies: 3
    • Views: 1,926
    02-21-2016, 01:42 PM Go to last post
  49. Time Series - Difference over time

    Hello, I'm new in the time series, so I need some help. I have a short time series (5 quarters), with the proportion of a parameter (public...

    Started by wisit‎, 03-08-2016 10:52 AM
    difference, proportion, significance, time series
    • Replies: 3
    • Views: 2,074
    04-15-2016, 02:15 AM Go to last post
  50. Post Principal component analysis (PCA) on clustered data

    Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

    Started by AkaKiwi‎, 03-18-2016 10:40 AM
    • Replies: 3
    • Views: 1,650
    03-21-2016, 03:18 AM Go to last post
  51. Confidence Intervals in a research paper

    Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

    Started by leafonthewind‎, 03-23-2016 01:13 PM
    confidence intervals, independent events, p value, research article
    • Replies: 3
    • Views: 3,271
    03-24-2016, 07:42 AM Go to last post
  52. HELP - citation model in R

    Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example...

    Started by terstat‎, 08-18-2016 10:15 AM
    bibliometric, citation, model, r software, statistic
    • Replies: 3
    • Views: 1,734
    09-05-2016, 09:04 AM Go to last post
  53. Analyzing Likert Scale Data Using Statistical Tools

    Hi everyone, I'm doing an MBA dissertation on the topic "Impact of Customer Service Satisfaction on Business Performance". The hypothesis set is...

    Started by Sahar04‎, 06-24-2016 05:22 AM
    • Replies: 3
    • Views: 1,613
    06-29-2016, 01:50 AM Go to last post
  54. Using Factor Scores in Discriminant Analysis

    I am doing research on whether corporations that engage in earnings fraud can be identified up to three years before the fraud occurs. My end result...

    Started by ceilylou‎, 06-21-2016 01:05 PM
    discriminant analisys, factor analyses
    • Replies: 3
    • Views: 818
    06-21-2016, 04:40 PM Go to last post
  55. Repeated measures - Within/Between explained

    Hey guys, I'm having troubles understanding my analysis. I have patients going through pulmonary functions test every 2 weeks in 5 different time...

    Started by XPeriment‎, 06-24-2016 12:24 AM
    • Replies: 3
    • Views: 1,567
    07-16-2016, 08:58 AM Go to last post
  56. Influence of a person in repeat measurement (multilevel) or longitudinal data

    Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

    Started by hlsmith‎, 07-07-2016 09:47 AM
    • Replies: 3
    • Views: 1,082
    07-08-2016, 11:23 AM Go to last post
  57. Smile Probability equation X > number

    Long time lurker, first time poster! All help much appreciated! I have one equation being compared to a number: X = any positive real number ...

    Started by TheFermat‎, 08-19-2016 09:38 PM
    • Replies: 3
    • Views: 1,237
    08-29-2016, 07:21 PM Go to last post
  58. 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: 1,242
    08-28-2016, 07:31 PM Go to last post
  59. Zero vs missing data

    Hello I have a question regarding 0 (=zero) vs missing data. If I have an observation that have many variables but one of the variable is not...

    Started by Hedva‎, 08-28-2016 08:02 AM
    • Replies: 3
    • Views: 1,019
    08-29-2016, 03:12 AM Go to last post
  60. Population estimation

    Hi, Just would like to ask for some of your valuable advice! I am working on the project which would like to use the small sample to estimate...

    Started by Ming‎, 09-02-2016 09:59 PM
    • Replies: 3
    • Views: 1,077
    09-03-2016, 08:47 AM Go to last post

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