/* Exercise 2.3 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 Version 1, 22/09/2014 */ * Read data - change directory to location of your data file; data PROTEIN; infile 'C:\stats4biol\data\PROTEIN.DAT' firstobs=2 expandtabs; input Dplant Before After; run; proc print data=PROTEIN;run; * 2-sided t-test for the paired difference; proc ttest data=PROTEIN sides=2; paired After*Before; run;