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R  and statistics




 

 

Applications:

Simple principles for storing the data in a logical structure should be followed before any data-analysis.

Introductory pages to R.

  1. First steps in R
  2. Simple data-entry in R
  3. Data-structures in R
  4. Formulas (models) in R

Regression  (statistische dataverwerking)Examples are worked out. An attempt is made to follow a simple step-by-step approach without magic or confusion by writing several tasks into one condense statement.

ANOVA  (proeftechniek) Examples are worked out. Similar approach as above.

Frequency analysis for hydrology

Hydrological modelling in R

 

R  is a free software in the GNU-concept. In this case this means that a community of statisticians maintain the code and continuously update  the programme on a voluntary basis. The programme is not easy but is extremely flexible (statisticians can write and adjust to fit their own specific wishes); adequate for professional statistics and follows the trends in modern statistics. Matrix calculations are possible. Bugs are fixed immediately after discovery. The approach is strictly object oriented (Scheme inspired): everthing is an object: data, matrices, results, functions etc with "properties" and "methods" and is classified in "classes" .  Programming of own functions and procedures is possible.

R is similar to the commercially available S-plus. Last programme has a better user-interface and graphing, but these features come with a price-tag as in other professional packages.  In terms of statistical capabilities R is often more advanced as statisticians can write their own analysis methods and distribute it freely to colleagues.

Where to find the software?

  • the software can be downloaded  R CRAN for windows or most other platforms (linux, Apple etc.); both source codes and precompiled binaries (=executables) are available;
  • first read README before downloading (at May 10, 2005 the Windows version between the Binaries is SetupR.exe at http://cran.r-project.org/bin/windows/
  • mirror sites are available; in principle a closer site could be faster
  • very efficient (complete version 1.4.1 is +/- 20 Mbytes depending on installed documentation) and statistically  powerful.
  • official documentation is (very) difficult to read...

More documentation (useful for further study and standard statistical analysis): 

Example of libraries


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GuidoWyseure   Faculteit Landbouwkundige en toegepaste biologische wetenschappen
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