文献计量学系列37: 不同时期主题分析
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一、timeslice函数简介
二、加载包和导入数据
pacman::p_load(bibliometrix, rio, magrittr)m1_TE <- import(file = 'E:/精鼎统计/m1_TE.xlsx')rownames(m1_TE) <- m1_TE$SRm2 <- m1_TEm2$ID <- m2$DE_TM三、不同时期题录数据框
#Time sliceyear <- c(2000, 2010)list_m <- timeslice(m2, breaks = year) #subpriod bibliometrix dataframenames(list_m) <- c('1991-2000','2001-2010','2011-2019')
#Main informationlist_maininfo <- lapply(list_m, biblioAnalysis) %>% lapply(function(x)summary(x, verbose = FALSE)) %>% lapply(function(x)x$MainInformationDF)list_maininfo# $`1991-2000`# Description Results# 1 MAIN INFORMATION ABOUT DATA # 2 Timespan 1991:2000# 3 Sources (Journals, Books, etc) 17# 4 Documents 55# 5 Average years from publication 23.6# 6 Average citations per documents 58.11# 7 Average citations per year per doc 2.351# 8 References 1223# 9 DOCUMENT TYPES # 10 article 41# 11 article; proceedings paper 10# 12 proceedings paper 4# 13 DOCUMENT CONTENTS # 14 Keywords Plus (ID) 198# 15 Author's Keywords (DE) 209# 16 AUTHORS # 17 Authors 128# 18 Author Appearances 165# 19 Authors of single-authored documents 6# 20 Authors of multi-authored documents 122# 21 AUTHORS COLLABORATION # 22 Single-authored documents 7# 23 Documents per Author 0.43# 24 Authors per Document 2.33# 25 Co-Authors per Documents 3# 26 Collaboration Index 2.54# 27 # # $`2001-2010`# Description Results# 1 MAIN INFORMATION ABOUT DATA # 2 Timespan 2001:2010# 3 Sources (Journals, Books, etc) 29# 4 Documents 107# 5 Average years from publication 14# 6 Average citations per documents 51.36# 7 Average citations per year per doc 3.376# 8 References 3263# 9 DOCUMENT TYPES # 10 article 88# 11 article; proceedings paper 11# 12 proceedings paper 7# 13 review 1# 14 DOCUMENT CONTENTS # 15 Keywords Plus (ID) 464# 16 Author's Keywords (DE) 563# 17 AUTHORS # 18 Authors 312# 19 Author Appearances 420# 20 Authors of single-authored documents 1# 21 Authors of multi-authored documents 311# 22 AUTHORS COLLABORATION # 23 Single-authored documents 1# 24 Documents per Author 0.343# 25 Authors per Document 2.92# 26 Co-Authors per Documents 3.93# 27 Collaboration Index 2.93# 28 # # $`2011-2019`# Description Results# 1 MAIN INFORMATION ABOUT DATA # 2 Timespan 2011:2019# 3 Sources (Journals, Books, etc) 56# 4 Documents 222# 5 Average years from publication 4.07# 6 Average citations per documents 15.23# 7 Average citations per year per doc 2.563# 8 References 7478# 9 DOCUMENT TYPES # 10 article 212# 11 article; proceedings paper 6# 12 review 4# 13 DOCUMENT CONTENTS # 14 Keywords Plus (ID) 725# 15 Author's Keywords (DE) 1006# 16 AUTHORS # 17 Authors 774# 18 Author Appearances 1087# 19 Authors of single-authored documents 4# 20 Authors of multi-authored documents 770# 21 AUTHORS COLLABORATION # 22 Single-authored documents 5# 23 Documents per Author 0.287# 24 Authors per Document 3.49# 25 Co-Authors per Documents 4.9# 26 Collaboration Index 3.55# 27
主要信息中提供每个时期题录数据框的基本信息，包括每个时期的时间范围、文档数等信息。通过主要信息我们能够对不同时期题录数据框有个大概的了解。
四、不同时期主题战略坐标图
#Thematic map listlist_TM <- lapply(list_m, function(m){ thematicMap(M = m, field = 'ID', n = 250, stemming = F, size = 0.5, n.labels = 3, repel = FALSE)})
#Subperiod thematic mapsub1TM <- list_TM$`1991-2000`$map#subperiod Isub1TM
sub2TM <- list_TM$`2001-2010`$map #subperiod IIsub2TMsub3TM <- list_TM$`2011-2019`$map#subperiod IIIsub3TM五、小结
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