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Shoney

木虫 (著名写手)

[求助] SD与SEM有区别吗?

SD: standard deviation
SEM: standard error of the mean
这两者有区别吗?
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猴普夫尔

银虫 (正式写手)

【答案】应助回帖

★ ★ ★
感谢参与,应助指数 +1
amisking: 金币+2, 鼓励发帖帮助解答问题。 2012-06-20 20:38:26
Shoney: 金币+1 2012-06-21 10:52:43
The standard error is the standard
deviation of the sampling
distribution of a statistic . [1] The
term may also be used to refer to
an estimate of that standard
deviation, derived from a particular
sample used to compute the
estimate.
For example, the sample mean is
the usual estimator of a population
mean. However, different samples
drawn from that same population
would in general have different
values of the sample mean. The
standard error of the mean (i.e., of
using the sample mean as a
method of estimating the
population mean) is the standard
deviation of those sample means
over all possible samples (of a
given size) drawn from the
population. Secondly, the standard
error of the mean can refer to an
estimate of that standard
deviation, computed from the
sample of data being analyzed at
the time.
看起来意思差不多

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2楼2012-06-20 18:09:28
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Shoney

木虫 (著名写手)

引用回帖:
2楼: Originally posted by 猴普夫尔 at 2012-06-20 18:09:28
The standard error is the standard
deviation of the sampling
distribution of a statistic .  The
term may also be used to refer to
an estimate of that standard
deviation, derived from a particula ...

两者的计算公式不知道有差别没?一般用哪个啊?
3楼2012-06-21 08:45:11
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nicknelson

至尊木虫 (职业作家)

【答案】应助回帖


感谢参与,应助指数 +1
Shoney: 金币+1 2012-06-21 10:52:50
SD是标准偏差,SEM是标准误差,反应的东西不一样。做图时用SEM的话,那个bar看着小,所以很多人用SEM。但是用SD也没问题,其实SD更能反应组内样本间的偏差。
4楼2012-06-21 09:02:34
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