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kong_fanli

木虫 (正式写手)

[交流] 【求助】P值含义

请教一个问题:P值是什么意思?网上查的资料也云里雾里的
两个统计样品尺寸大小的样本A和B,如果A的P value比B的大,是什么意思?A样品中大小分布比较均匀吗?

谢谢!




we examined the deviation of the
frequency distribution of compositions from the binomial
distribution, which can be regarded as random compositional
distribution, using the x2 test. Note that the binomial distribution
is determined by a composition, a number of the atoms
in one block, and a number of blocks. Figure 4 shows
the frequency distributions of Fe, Nb, and B concentrations
analyzed for more than 3000 blocks (one block consists of
100 atoms) obtained by 3DAP. The histograms show the experimental
results, whereas the solid curves are the binomial
distribution functions for random distribution. The frequency
distribution of the homogeneous state should follow the binomial
distribution. For each element, the x2 value, the degree
of freedom (v), and the significance probability value
(P value) are written in the figures.19 In the as-quenched
specimen, the P values are relatively large, indicating that
the compositional fluctuation is negligible, that is, a homogeneous
compositional distribution.
On the other hand, the
small P values of the specimen annealed up to 773 K indicate
that an appreciable compositional fluctuation occurs at
the stage of 773 K. Thus, the 3DAP analyses reveal that the
local compositional fluctuation starts to occur after annealing
at about 773 K concurrently with the structural change observed
in Fig. 3.

[ Last edited by kong_fanli on 2010-8-23 at 16:09 ]
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math2000

铁杆木虫 (职业作家)

kong_fanli(金币+3): 2010-08-30 09:20:36
p值就是在原假设下,该总体出现现有数据的概率,或者说在现有数据下,原假设成立的一种合理性,p值越大,原假设成立的可能性就越大。
p值越少,就说明原假设成立的可能性越小。通常当p值小于0.05时,就认为原假设不成立。
3楼2010-08-30 00:07:21
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statsky

木虫 (正式写手)

kong_fanli(金币+2):能不能再给解释解释,我把原文写上了 2010-08-23 08:18:59
这要看你的具体问题是什么,如果是检验问题,p值反映的是样本数据支持原假设的证据,p值越大,证据越强。
2楼2010-08-23 07:55:46
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xmok77

金虫 (小有名气)

p值越小,否定原假设的证据越强
4楼2010-09-06 11:17:49
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