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Metal concentrations (natural variables) were converted according to the following equation so that the coded concentrations (coded variables) had values of 1 and +1 at low and high levels, respectively.
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2Â¥2013-12-19 16:52:33
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Èç2Â¥Ö¸³ö,Ô­ÎÄvalues of 1 and +1, Ã²ËÆÓ¦¸ÃÊÇvalues of -1 and +1
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