24小时热门版块排行榜    

查看: 3736  |  回复: 4
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

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 ]
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

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
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 5 个回答

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
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

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
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[基金申请] 时间戳又变了 +11 wuchongjun 2026-08-20 16/800 2026-08-20 19:26 by wuchongjun
[基金申请] 科研孤儿太难了 +9 我4大白菜 2026-08-20 9/450 2026-08-20 18:23 by 2549091707
[基金申请] 时间戳变了,能看出什么问题? +18 基诺咪客 2026-08-17 23/1150 2026-08-20 17:19 by Godzela
[基金申请] 只有每年这种时候来逛逛小木虫 +21 yaoyewhu2008 2026-08-20 22/1100 2026-08-20 17:03 by yaoyewhu2008
[基金申请] 今天系统多次维护,明天很可能放榜! +9 zju2000 2026-08-16 10/500 2026-08-20 15:56 by Leogzhya
[基金申请] 放榜前的不淡定 40+3 snowwithsea 2026-08-19 12/600 2026-08-20 15:56 by lfy8008
[基金申请] 重要消息,中午系统在维护 +11 yuleib84 2026-08-18 12/600 2026-08-20 11:09 by xskun
[基金申请] 今天基金会出结果吗?20260819 +14 kkkl_v 2026-08-19 15/750 2026-08-20 08:21 by sunzitan
[基金申请] filecode,4个jtjc了 +11 ziyangfang 2026-08-19 13/650 2026-08-19 21:28 by aasahr
[教师之家] 为什么余额宝的年化利率越来越低?主要原因有哪些? +5 瞬息宇宙 2026-08-15 5/250 2026-08-19 20:23 by super2002521
[基金申请] 今天放榜没戏了吧 +4 yuleib84 2026-08-19 5/250 2026-08-19 19:52 by hhs666
[基金申请] filecode=后面第一个是大写字母 +10 wangze12014 2026-08-14 12/600 2026-08-19 16:56 by 苦难博士
[基金申请] 2027广东省杰青 +4 奶牛小黑 2026-08-15 10/500 2026-08-19 11:02 by wanfengnew
[基金申请] 朋友圈看到的 +6 wangzilk 2026-08-18 8/400 2026-08-19 10:55 by Haru815
[基金申请] 快农历七夕节了,轻松一下,男人悄悄话,女施主请不要进来。 +6 Tide man 2026-08-14 7/350 2026-08-19 09:56 by ZJTJZ
[基金申请] 什么时候开奖? +6 CrisMessi 2026-08-18 6/300 2026-08-19 08:06 by Equinoxhua
[基金申请] 明天放榜? +5 Shxjjxjkx 2026-08-18 5/250 2026-08-18 18:14 by -大大大大大-
[论文投稿] 投稿咨询 +4 wwm09 2026-08-17 6/300 2026-08-18 15:36 by wwm09
[基金申请] 今天维护系统维护 祝所有人 高中 +8 gjjjzhong 2026-08-18 9/450 2026-08-18 13:01 by 家与远方
[基金申请] 93BebMhtakh前后11位开头都是大写 +4 且听虎啸 2026-08-17 5/250 2026-08-18 00:49 by 蔡棒棒菂
信息提示
请填处理意见