(1) In using the 2012 IAR Mortality Table, the mortality rate for a person age x in year (2012 + n) is calculated as follows:
(a) qx2012+n = qx2012(1-G2x)n;
(b) the resulting qx2012+n shall be rounded to three decimal places per 1,000, e.g., 0.741 deaths per 1,000;
(c) also, the rounding shall occur according to the formula above, starting at the 2012 period table rate. For example:
(i) for a male age 30, qx2012 = 0.741, qx2013 = 0.741 * (1-0.010) ^ 1 = 0.73359, which is rounded to 0.734. qx2014 = 0.741 * (1-0.010) ^ 1 = 0.7262541, which is rounded to 0.726.
(ii) a method leading to incorrect rounding would be to calculate qx2014 as qx2013 * (1-0.010), or 0.734 * 0.99 = 0.727.
(d) It is incorrect to use the already rounded qx2013 to calculate qx2014.