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Table 7 Factors coded as dummy variables

From: Reduction of arsenic content in a complex galena concentrate by Acidithiobacillus ferrooxidans

Pattern Run Pulp Density Surface Area Ferric Chloride Carbon Dioxide Air 9 K medium Strain Results As mg/l
----+++ 1 0 0 0 0 1 1 1 R1
--++--+ 2 0 0 1 1 0 0 1 R2
-+-+-+- 3 0 1 0 1 0 1 0 R3
-++-+-- 4 0 1 1 0 1 0 0 R4
+--++-- 5 1 0 0 1 1 0 0 R5
+-+--+- 6 1 0 1 0 0 1 0 R6
++----+ 7 1 1 0 0 0 0 1 R7
+++++++ 8 1 1 1 1 1 1 1 R8
  1. Results of As in leachate (mg/l) were determined each 48 hours, to finally have the results of this table 15 times during the 28 days of the experiment