/* Exercise 2.2

 Statistical Methods in Biology: Design and Analysis of Experiments and Regression
 by S.J. Welham, S.A. Gezan, S.J. Clark & A. Mead (2014)
 Chapman & Hall/CRC Press, Boca Raton, Florida. ISBN: 978-1-4398-0878-8
 Data from Rothamsted Research (A. Karp)
 Version 1, 22/09/2014 
*/

* Read data - change directory to location of your data file;
data WILLOW;
  infile 'C:\stats4biol\data\WILLOW.txt' firstobs=2 expandtabs;
  input DBeetle Length Width;
run;
proc print data=WILLOW;run;

* Obtaining histogram;
axis1 label=('Beetle width');
proc univariate data=WILLOW;
  histogram Width / haxis=axis1;
run;

* Sample statistics;
proc means data=WILLOW mean median;
  var Width;
run;