24小时热门版块排行榜    

查看: 361  |  回复: 1

chenming7899

木虫 (初入文坛)

[求助] 如何进行非线性方程拟合?

审稿人提出要采用非线性方程进行拟合。如何用 Excel来拟合?
编辑的话
one should never compare SD nor R2 for fits in different coordinates. Determination of parameters and comparisons of fit quality should be performed for the same definition of data deviation. When common (nonweighted and not orthogonal) LSQ fit is performed for any Y-value (minimization of Sum[(Y_exp-Y_fit)^2]) it corresponds to the assumption of constant statistical deviation of Y (i.e. SD(Y) does not depend on X or Y) with Gaussian distribution. If any kind of data transformation is used to obtain linear plot, then this assumption is no longer valid.
E.g. LSQ in the linear Freundlich plot (log coordinates) corresponds to the assumption that in your system SD(q)/q = const (not SD(q)=const) an d for the linear Langmuir plot (i.e. 4 linear Langmuir plots) it is even more complicated.  The only way is to use non-linear fitting (e.g. with free Solver module present in Excel and Open/LibreOffice) – or better yet, weighted non-linear LSQ - and reserve linear plots for presentation purposes.  

理科出身,没学过。请各位大侠帮忙。
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

SAYRG

金虫 (小有名气)

【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
chenming7899: 金币+10, ★★★很有帮助 2013-01-13 16:23:22
csgt0: 金币+3, 欢迎交流 2013-01-14 14:57:17
1.
?????????????????????????Langmuri model ???е????????Freundlich model ????????????????????????????????????Excel?e???????w???????????@?N??????С??x????W????????????
2.
????????????^?}?s????????????????t????????N???????(Origin??1stOpt??Matlab??SPSS??R??Statistica......)?e?????????????M?????????P????????y?????
?????Y????o??????????
[???]?????????????????????????????? ???? 1stopt ????????
?????@?治??Global fitting??
http://muchong.com/bbs/viewthread.php?tid=4586018&fpage=1
1stOpt ?????? - ??????
http://www.7d-soft.com/files/1stOpt%20Manual.pdf

3. ???о??????????????????Z??????????W???????H??
2楼2013-01-11 16:32:46
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 chenming7899 的主题更新
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[基金申请] 奇怪,两个人的filecode固定段从头到尾一模一样 +7 布布和一二 2026-08-10 9/450 2026-08-11 22:12 by 医学老男孩
[基金申请] 是这周出结果还是下周出结果? +3 yuleib84 2026-08-11 3/150 2026-08-11 21:53 by jnhyjjm
[基金申请] 小木虫上这么多卖论文的,真有人买论文么?感觉没必要啊 +8 Tide man 2026-08-10 9/450 2026-08-11 20:39 by beefly
[基金申请] 有时候,自然基金真的不能太认真 (我的申报经验) +3 majunge000 2026-08-11 4/200 2026-08-11 20:13 by lch2012
[基金申请] 帮忙看看fileCode +7 wwncly 2026-08-10 13/650 2026-08-11 19:36 by 冰心玉壶晴
[硕博家园] 读博的好处 +3 lnee 2026-08-11 3/150 2026-08-11 18:10 by 希望我好好的
[基金申请] 什么时候出结果,有咨询渠道??? +3 Tide man 2026-08-11 3/150 2026-08-11 17:54 by kudofaye
[基金申请] 分享一下我之前已中青C的计划书的filecode +3 布布和一二 2026-08-11 4/200 2026-08-11 15:20 by aasahr
[基金申请] FileCode能看出啥? +7 要乐观耀哥 2026-08-10 17/850 2026-08-11 10:50 by 要乐观耀哥
[基金申请] 我的国基提前知道中了,可是同事的操作让我实在接受不了,怎么会有这样的人 +8 家与远方 2026-08-10 13/650 2026-08-11 09:49 by 家与远方
[基金申请] 基金中了 +15 laoda193707 2026-08-06 15/750 2026-08-11 00:11 by jiafei2190
[基金申请] 关于Filecode分析方法 +3 majunge000 2026-08-10 3/150 2026-08-10 15:46 by lch2012
[基金申请] 国自然结果 +4 Vierhys 2026-08-10 8/400 2026-08-10 15:06 by Vierhys
[基金申请] 好奇怪的filecode +4 布布和一二 2026-08-08 5/250 2026-08-10 14:20 by 冰心玉壶晴
[基金申请] 2026国自然放榜时间 +9 布布和一二 2026-08-08 9/450 2026-08-10 11:22 by xxxx2020
[基金申请] fileCode有新解读? +10 Tide man 2026-08-08 18/900 2026-08-09 12:55 by 仁砚薪传
[基金申请] 关于filecode +4 布布和一二 2026-08-07 7/350 2026-08-07 22:55 by zhanghaozhu
[基金申请] 固定端突然变了,今天 +6 archvillain 2026-08-06 10/500 2026-08-07 16:03 by 医学老男孩
[基金申请] filecode变化情况 +6 布布和一二 2026-08-07 22/1100 2026-08-07 14:45 by 且听虎啸
[基金申请] 好消息?这个有何含义??? +8 Tide man 2026-08-05 10/500 2026-08-05 16:14 by xmuxiaoyu
信息提示
请填处理意见