木虫 (正式写手)
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【答案】应助回帖
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帝夫(金币+2, CMEI+1): 很好！授予CMEI一枚，欢迎继续关注晶体版！ 2011-12-16 14:57:32
找到了“晶体学会的规定”。按作者自己的说法，只是‘recommadation'.如果想在误差中保留1位有效数字，仍然是符合规定的，只是舍入误差稍大。下面是原文，供查阅。
12. The numerical value of an estimate y and its
standard uncertainty u(y) should not be reported with an
excessive number of digits. However, y should be quoted
with sufficient accuracy to minimize the effect of roundoff
error* in subsequent calculations. In order to limit the
round-off error of y (denoted by e) to 25% of u(y), u(y)
should be quoted to two significant digits in the range 10
to 19, implying that corresponding digits also be quoted
for y, and to one significant digit in the range 2 to 9. In
general, uncertainties should be rounded up rather than
to the nearest digit. For example, a bond distance of
1.542 49/~ with a s.u. of 0.015 32/~ should be reported
as 1.542 (16)/~ (e = 3%), and one of 2.163 52A with
a s.u. of 0.004 81/~ should be reported as 2.164 (5)/~
(e = 10%). Correlation coefficients should normally be
quoted with two significant figures unless their absolute
value is close to the value of 1.0, in which case three
significant figures should be used. |
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