sudo aptitude install r-base

sudo aptitude install libjpeg62

Télécharger RStudio Desktop pour Debian sur http://www.rstudio.com/products/rstudio/download/

sudo dpkg -i rstudio-0.98.1062-i386.deb

Packages:

• needs to be installed once
• needs to be loaded each session

library(package)

Tips:

• ctrl+return = run the selected code

Structures:

• vectors
  • character
  • numeric
  • logic
• matrices
  • combine vectors of same type and same length
• data frames
  • no conditions on type and same length
• lists
  • no conditions on type nor length

Things that can be done with R (seen at the flamescourse)

• import datasets
• create functions
• tables (needed for charts)
• plotting graphics
  • bar chart, pie chart
  • boxplots
  • qq-plots
• descriptive statistics
  • categorical data
  • continuous data
    • central tendencies: mean, median, mode, min, max
    • variance
• statistical inference
  • categorical data
    • chi², Fisher, binomial, prop.test
  • continous data
    • t-test (one and two sample), Wilcoxon, regression

Assign value = or <-, differences : in a function

• = : local
• <- : global ?

N.B. : the comparator is '=='

Pour faire ceci (avec SAS):

data example_zhsites;
  set example_zhsites;
  if f_no_ebeds=1 then nbeds_e2=5;
run;

en r, il faut passer par une boucle et assigner chaque item du vecteur ([i]) :

for(i in 1:nrow(example_zhsites)) {
  if (example_zhsites$f_no_ebeds[i] == 1) {
    example_zhsites$nbeds_e2[i] = 5
  }
}

source : The condition has length > 1 and only the first element will be used