statistical exploratory analysis with “enquirer”
DESCRIPTION
Statistical Exploratory Analysis with “EnQuireR”. Introduction Installation How to Report. Descriptive analysis & Exploratory analysis. 1. Introduction. Example: a frequency distribution chart. 1. Descriptive statistic are mostly “Univariate analysis”. - PowerPoint PPT PresentationTRANSCRIPT
Statistical Exploratory Analysis with “EnQuireR”
1. Introduction2. Installation3. How to4. Report
Statistical exploratory analysis with EnQuireR
Descriptive analysis & Exploratory analysis 1. Introduction
1. Descriptive statistic are mostly “Univariate analysis”. It involves the examination across cases of a single variable, focusing on three characteristics: the distribution; the
central tendency; and the dispersion
Example: a frequency distribution chart
2. Exploratory analysis is an approach to analyzing data for the purpose of formulating hypotheses. “Multivariate or Factor analysis” are used to uncover the latent structure (dimensions) of a set of variables. It reduces attribute space from a larger number of variables to a smaller number of factors and allows the definition of
statistically consistent cluster.
Example: Multivariate cluster analysis from three measurements of femur properties
source
From Wikipedia
Statistical exploratory analysis with EnQuireR
EnQuireR: a dedicated package in the R environment
1. Introduction
1. “R” is a free software environment for statistical computing and graphics. (http://www.r-project.org ) – It is the Open Source Equivalent of SPSS, SAS or STATA – Mostly used in University – Free support over various forums.
2. EnQuireR is a “R” package that allows the statistical exploration of data issued from questionnaires (http://enquirer.free.fr/EnQuireR.pdf; http://cran.r-project.org/web/packages/EnQuireR/EnQuireR.pdf)
Multiple Correspondence Analysis (MCA) : A type of multivariate analysis that allows to
“Summarize the pattern of relationships between different categorical variables”
Statistical exploratory analysis with EnQuireR
A few download (all Free & Open source)
1. http://lib.stat.cmu.edu/R/CRAN/bin/windows/base/ (direct download) =>The R environment
2. http://www.texniccenter.org/resources/downloads/29 (direct download) => Used to generate PDF
3. http://miktex.org/2.9/setup (direct download) => Used to generate PDF
4. http://enquirer.free.fr/ (direct download) => The specific R package for questionnaire analysis
Install the first 3 applications!
2. Installation
Statistical exploratory analysis with EnQuireR
Installation
If you are behind a proxy, add “–internet2” to your exe shortcut
“R” will then use the same proxy as your local Internet Explorer
2. Installation
Statistical exploratory analysis with EnQuireR
Setting up a “Working Directory”
Start from your customized shortcut
This is the “R shell”
Change the working directory with “setwd()” (here D:/stat)
To check your working directory, enter: getwd()
3. How to
Statistical exploratory analysis with EnQuireR
Install the local package “EnquireR”3. How to
Statistical exploratory analysis with EnQuireR
Load the library to start R Commander
Enter library(“EnQuireR”) in
the R shell
This will open a new window for
the “R Commander”
console
3. How to
Statistical exploratory analysis with EnQuireR
Load your dataset
1. In R commander, import a new dataset
2. Enter your-dataset-name
3. Select the excel file in your file system.
4. Select your worksheet in the excel document
3. How to
Statistical exploratory analysis with EnQuireR
Start the analysis
Your data has been loaded.Note that column name may
have been automatically renamed
1. Enter: “res.enmca <- ENMCA(your-dataset-name, report=TRUE) “
2. Click “Submit”
3. Wait… this a lot of computation !!!
4. A directory named "EnQuireR" has been created in your working directory with all your reports
3. How to
Statistical exploratory analysis with EnQuireR
Get your reports
The EnQuireR package provides two kinds of automatically generated reports:
1. A synthetic report made of slides and divided in 2 parts: Multivariate exploration of the questionnaire Typology of the individuals.
2. A detailed and exhaustive report: Indicates whether a given set of categorical variables
depends on another one. Definition of the axis of the correspondence map Spreading of individuals and categories in the
correspondence map. List of categories that best describe each automatically
defined cluster
4. Report
Statistical exploratory analysis with EnQuireR
Requirement on data
• Data should be “categorical” (i.e. non continuous), typically closed response questions
• Categories should have more than one level
• Data should not contain space – to be replaced by point for instance
• Column names should be as short as possible to be better visualized in the final report
4. Report
Statistical exploratory analysis with EnQuireR
Usage for UNHCR
Analysis could be performed on:• Registration data (proGres)• IDP profiling• Site assessment (needs assessment)
Possibility to define the characteristics of statistically homogenous groups.
Those characteristics can then be used to build targeted assistance programme!
4. Report
Examples of case studies can be found here: http://enquirer.free.fr/case-studies/