factor是因子，character是字符，有个比喻我在别处看到的，说得特别好，factor和character的区别就像为什么180度要表示成π，90度是π/2，当时理解不了，等用到的时候就会惊叹“哇，factor这么好用，在分类的时候一般将标签转化为factor
>x<-c("大","小","大",levels=c("大","小")) >yinzi<-factor(x) >print(yinzi) levels1 levels2 大 小 大 大 小 Levels:大小 使用labels参数为每个因子水平添加标签,labels参数的字符顺序,要和levels参数的字符顺序保持一致。 >x<-factor(c("大","小","大","小","小"),levels=c("大",...
This data set is related to "How Do Factor Premia Vary Over Time? A Century of Evidence" (Ilmanen, Israel, Lee, Moskowitz and Thapar, 2021). We examine four prominent factor premia – value, momentum, carry, and defensive – over a century from six asset classes. We verify their ...
S Sarawagi - International Conference on Very Large Data Bases 被引量: 138发表: 1995年 The Conscious Use of Metaphor in Outward Bound Learning is a metaphoric function in which the individual confirms or reorders his sense of reality by relating previous experiences with present ones. Out......
目前更多的排放因子还是采用默认值，国内排放因子默认值一般来源于相应的核算报告中的补充文件。国际上排放因子的选择可以参考 IPCC 排放因子数据库 EFDB（Emission Factor Database，简称EFDB）、欧盟Emission Factor Database、美国EPA（Environmental Protection Agency，简称EPA）、英国政府公布的排放因子转换系数、世界粮农...
Improving Cross-domain Recommendation through Probabilistic Cluster-level Latent Factor Model--Extended Version Cross-domain recommendation has been proposed to transfer user behavior pattern by pooling together the rating data from multiple domains to alleviate the ... S Ren,S Gao - 《Eprint Arxiv》...
Generate a data frame of all factor dataSteven L. Scott
- 1986 () Citation Context ...ild-up factors The G-P fitting parameters were then used to generate energy absorption buildup factor data for these ... Y Harima,Y Sakamoto,Tanaka, S 被引量: 37发表: 1986年 New gamma-ray buildup factor data for point kernel calculations: ANS-6. 4. 3...
The inference of Gene Regulatory Networks (GRNs) is one of the key challenges in systems biology. Leading algorithms utilize, in addition to gene expression, prior knowledge such as Transcription Factor (TF) DNA binding motifs or results of TF binding ex
专利名称：Matching system using a factor database, matching devices, and factor database creation method for the system 发明人：竹野 輝之,福島 勉,菅原 勝寿,住吉 若菜,荒井 伸行申请号：JP2001220117 申请日：20010719 公开号：JP4886940B2 公开日：20120229 专利内容由知识产权出版社提供 摘要：Array ...