dataset=cement
begin description
Data set give compressive strenght of 3 types of cement
at various curing times.
CM is a standard brand while ME and MA use coal waste products.
Contributed by Alyass Hosin.
end description
begin variables
col 0 = x1 = curing time
col 1 = x2 = mixture (2 for CM, 0 for ME, and 1 for MA)
col 2 = y = compressive strength of the cement
co1 3 = x3 = indicator for CM (1 for CM, 0 for the other two brands)
end variables
begin data
7   2 4392 1
7   2 4482 1
7   2 4182 1
7   2 4365 1
28  2 5296 1 
28  2 5602 1
28  2 5408 1
28  2 5069 1
60  2 6130 1
60  2 5961 1
60  2 6185 1
60  2 6092 1
90  2 6325 1
90  2 6220 1
90  2 6414 1
90  2 6342 1
180 2 6481 1
180 2 6669 1
180 2 6481 1
180 2 6459 1
7   0 3917 0
7   0 3753 0
7   0 3825 0
7   0 3937 0
28  0 5161 0
28  0 4794 0
28  0 4800 0
28  0 4918 0
60  0 5422 0
60  0 6314 0
60  0 5976 0
60  0 6191 0
90  0 6879 0
90  0 6466 0
90  0 6973 0
90  0 6772 0
180 0 7307 0
180 0 6799 0
180 0 7313 0
180 0 7230 0
7   1 3162 0
7   1 3133 0
7   1 3164 0
7   1 3201 0
28  1 4792 0
28  1 4072 0
28  1 4514 0
28  1 4602 0
60  1 6118 0
60  1 5653 0
60  1 5947 0
60  1 5815 0
90  1 6512 0
90  1 6697 0
90  1 6448 0
90  1 6655 0
180 1 6934 0
180 1 6930 0
180 1 6916 0
180 1 7052 0