24小时热门版块排行榜    

查看: 3255  |  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
[考研] 211本,11408一志愿中科院277分,曾在中科院自动化所实习 +3 Losir 2026-03-12 4/200 2026-03-16 21:52 by Losir
[考研] 考研化学学硕调剂,一志愿985 +3 张vvvv 2026-03-15 5/250 2026-03-16 20:25 by 张vvvv
[考研] 333求调剂 +3 文思客 2026-03-16 7/350 2026-03-16 18:21 by 文思客
[考研] 304求调剂 +5 素年祭语 2026-03-15 5/250 2026-03-16 17:00 by 我的船我的海
[考研] 304求调剂 +4 ahbd 2026-03-14 4/200 2026-03-16 16:48 by 我的船我的海
[考研] 本人考085602 化学工程 专硕 +12 不知道叫什么! 2026-03-15 14/700 2026-03-16 16:45 by 我的船我的海
[考研] 070300化学学硕求调剂 +6 太想进步了0608 2026-03-16 6/300 2026-03-16 16:13 by kykm678
[考研] 材料工程327求调剂 +3 xiaohe12w 2026-03-11 3/150 2026-03-14 20:20 by ms629
[基金申请] 现在如何回避去年的某一个专家,不知道名字 +3 zk200107 2026-03-12 6/300 2026-03-14 17:13 by zk200107
[考研] 267一志愿南京工业大学0817化工求调剂 +5 SUICHILD 2026-03-12 5/250 2026-03-14 14:53 by jean5056
[考研] 308 085701 四六级已过求调剂 +7 温乔乔乔乔 2026-03-12 14/700 2026-03-14 10:49 by JourneyLucky
[基金申请] 有必要更换申报口吗 20+3 fannyamoy 2026-03-11 3/150 2026-03-14 00:52 by zhanghaozhu
[考研] 一志愿湖师大化学289求调剂 +6 XMCMM3.14159 2026-03-10 6/300 2026-03-14 00:28 by JourneyLucky
[考研] b区环境工程求调剂 +4 Maps1 2026-03-10 6/300 2026-03-14 00:23 by JourneyLucky
[考研] 26考研调剂 +3 ying123. 2026-03-10 3/150 2026-03-14 00:18 by JourneyLucky
[考研] 2026考研调剂+本科延边大学+山东大学+生物化学与分子生物学+有项目经验 +3 ccdsscjy 2026-03-10 3/150 2026-03-14 00:12 by JourneyLucky
[考研] 311求调剂 +5 牛乳糖的卡卡 2026-03-10 5/250 2026-03-14 00:05 by JourneyLucky
[考研] 0703化学一志愿211 总分320求调剂 +5 玛卡巴卡啊哈 2026-03-11 5/250 2026-03-13 21:40 by JourneyLucky
[考研] 材料专硕274一志愿陕西师范大学求调剂 +4 薛云鹏 2026-03-13 4/200 2026-03-13 10:40 by 学员8dgXkO
[考研] 工科0856专硕化学工程269能调剂吗 +10 我想读研11 2026-03-10 10/500 2026-03-13 10:14 by Yuyi.
信息提示
请填处理意见