24小时热门版块排行榜    

查看: 429  |  回复: 3
当前主题已经存档。

cloudsea163

金虫 (著名写手)

[交流] 【求助】QSAR的计算问题

在QSAR的计算中,描述符计算出来后,我看文献中报道采用启发式算法对描述符进行筛选,请问启发式筛选描述符是如何进行,求各位指点一下

[ Last edited by lei0736 on 2009-11-25 at 14:09 ]
回复此楼
路漫漫其修远兮,吾将上下而求索!
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

niliu

铁杆木虫 (著名写手)

★ ★ ★
yuhuobuku(金币+2,VIP+0):谢谢跟帖交流 6-13 19:13
cloudsea163(金币+1,VIP+0): 6-14 19:02
好像是CODESSA软件里面的一种方法,具体怎么实现不清楚。
2楼2009-06-13 18:50:27
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

niliu

铁杆木虫 (著名写手)

★ ★ ★ ★
xuefei06(金币+2,VIP+0):3Q! 6-13 18:57
cloudsea163(金币+2,VIP+0): 6-14 19:02
cloudsea163(金币+2):谢谢 2010-02-27 15:22
CODESSA网站找到的:
The heuristic method for descriptor selection proceeds with a pre-selection of descriptors by sequentially eliminating descriptors that do not match any of the following criteria: (i) Fisher F-criteria greater than 1.0; (ii) R2 value less than a value defined at the start; (iii) Student’s t-criterion less than a defined value; (iv) duplicate descriptors having a higher squared intercorrelation coefficient than a predetermined level (retaining the descriptor with higher R2 with reference to the property). The descriptors that remain are then listed in decreasing order of correlation coefficients when used in global search for 2-parameter correlations. Each significant 2-parameter correlation by F-criteria is recursively expanded to an n-parameter correlation till the normalized F-criteria remains greater than the startup value. The best N correlations by R2, as well as by F-criterion, are saved.
3楼2009-06-13 18:56:31
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

cloudsea163

金虫 (著名写手)

那具体是怎么做的呢
路漫漫其修远兮,吾将上下而求索!
4楼2009-06-14 19:02:49
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 cloudsea163 的主题更新
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] 290求调剂 +6 @将就将就看 2026-03-10 11/550 2026-03-17 10:22 by @将就将就看
[考研] 考研调剂 +3 淇ya_~ 2026-03-17 5/250 2026-03-17 09:25 by Winj1e
[基金申请] 国自科面上基金字体 +6 iwuli 2026-03-12 7/350 2026-03-16 21:18 by sculhf
[考研] 0854控制工程 359求调剂 可跨专业 +3 626776879 2026-03-14 9/450 2026-03-16 17:42 by 626776879
[考研] 0703化学调剂 +6 妮妮ninicgb 2026-03-15 9/450 2026-03-16 16:40 by houyaoxu
[考研] 304求调剂 +3 曼殊2266 2026-03-14 3/150 2026-03-16 16:39 by houyaoxu
[考研] 070303一志愿西北大学学硕310找调剂 +5 d如愿上岸 2026-03-12 8/400 2026-03-16 15:19 by peike
[考研] 材料与化工一志愿南昌大学327求调剂推荐 +7 Ncdx123456 2026-03-13 8/400 2026-03-16 12:15 by karry wen
[考研] 材料工程专硕274一志愿211求调剂 +5 薛云鹏 2026-03-15 5/250 2026-03-15 20:38 by Logic2024
[考研] 080500,材料学硕302分求调剂学校 +4 初识可乐 2026-03-14 5/250 2026-03-14 21:08 by peike
[考研] 中科大材料与化工319求调剂 +3 孟鑫材料 2026-03-14 3/150 2026-03-14 20:10 by ms629
[考研] 265求调剂 +4 威化饼07 2026-03-12 4/200 2026-03-14 17:23 by userper
[考研] 297求调剂 +4 学海漂泊 2026-03-13 4/200 2026-03-14 11:51 by 热情沙漠
[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] 26考研调剂 +3 ying123. 2026-03-10 3/150 2026-03-14 00:18 by JourneyLucky
[考研] 工科,求调剂 +3 我887 2026-03-11 3/150 2026-03-13 21:39 by JourneyLucky
[考研] 070303一志愿西北大学学硕310找调剂 +3 d如愿上岸 2026-03-13 3/150 2026-03-13 10:43 by houyaoxu
[考研] 08食品或轻工求调剂,本科发表3篇sci一区top论文,一志愿南师大食品科学与工程 +3 我是一个兵, 2026-03-10 3/150 2026-03-13 10:21 by Yuyi.
[考研] 270求调剂 085600材料与化工专硕 +3 YXCT 2026-03-11 3/150 2026-03-13 10:13 by houyaoxu
[考研] 321求调剂(食品/专硕) +3 xc321 2026-03-12 6/300 2026-03-13 08:45 by xc321
信息提示
请填处理意见