For each of the first ( k +1) ranked samples; select the unit with rank k +1 and measure the Y value that corresponding to x(k+1)i and denote it by y[k+1]i .
For each of the first ( k +1) ranked samples; select the unit with rank k +1and measure the Y value that corresponding to x(k+1)i and denote itby y[k+1]i .