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$SR
m2 <- m1_TE
m2$ID <- m2$DE_TM
三、不同时期题录数据框
#Time slice
year <- c(2000, 2010)
list_m <- timeslice(m2, breaks = year) #subpriod bibliometrix dataframe
names(list_m) <- c('1991-2000','2001-2010','2011-2019')
#Main information
list_maininfo <- lapply(list_m, biblioAnalysis) %>%
lapply(function(x)summary(x, verbose = FALSE)) %>%
lapply(function(x)x$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
#
# $`2011-2019`
# Description Results
# 1 MAIN INFORMATION ABOUT DATA
# 2 Timespan 2011:2019
# 3 Sources (Journals, Books, etc) 56
# 4 Documents 222
# 5 Average years from publication 4.07
# 6 Average citations per documents 15.23
# 7 Average citations per year per doc 2.563
# 8 References 7478
# 9 DOCUMENT TYPES
# 10 article 212
# 11 article; proceedings paper 6
# 12 review 4
# 13 DOCUMENT CONTENTS
# 14 Keywords Plus (ID) 725
# 15 Author's Keywords (DE) 1006
# 16 AUTHORS
# 17 Authors 774
# 18 Author Appearances 1087
# 19 Authors of single-authored documents 4
# 20 Authors of multi-authored documents 770
# 21 AUTHORS COLLABORATION
# 22 Single-authored documents 5
# 23 Documents per Author 0.287
# 24 Authors per Document 3.49
# 25 Co-Authors per Documents 4.9
# 26 Collaboration Index 3.55
# 27
主要信息中提供每个时期题录数据框的基本信息,包括每个时期的时间范围、文档数等信息。通过主要信息我们能够对不同时期题录数据框有个大概的了解。
四、不同时期主题战略坐标图
#Thematic map list
list_TM <- lapply(list_m, function(m){
thematicMap(M = m, field = 'ID', n = 250, stemming = F, size = 0.5, n.labels = 3, repel = FALSE)
})
#Subperiod thematic map
sub1TM <- list_TM$`1991-2000`$map#subperiod I
sub1TM
sub2TM <- list_TM$`2001-2010`$map #subperiod II
sub2TM
sub3TM <- list_TM$`2011-2019`$map#subperiod III
sub3TM
五、小结
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