fieldByYear {bibliometrix}

Field Tag distribution by Year

Description

It calculates the median year for each item of a field tag.

Usage

fieldByYear(
  M,
  field = "ID",
  timespan = NULL,
  min.freq = 2,
  n.items = 5,
  labelsize = NULL,
  remove.terms = NULL,
  synonyms = NULL,
  dynamic.plot = FALSE,
  graph = TRUE
)

Arguments

M

is a bibliographic data frame obtained by convert2df function.

field

is a character object. It indicates one of the field tags of the standard ISI WoS Field Tag codify.

timespan

is a vector with the min and max year. If it is = NULL, the analysis is performed on the entire period. Default is timespan = NULL.

min.freq

is an integer. It indicates the min frequency of the items to include in the analysis

n.items

is an integer. I indicates the maximum number of items per year to include in the plot.

labelsize

is deprecated argument. It will be removed in the next update.

remove.terms

is a character vector. It contains a list of additional terms to delete from the documents before term extraction. The default is remove.terms = NULL.

synonyms

is a character vector. Each element contains a list of synonyms, separated by ";", that will be merged into a single term (the first word contained in the vector element). The default is synonyms = NULL.

dynamic.plot

is a logical. If TRUE plot aesthetics are optimized for plotly package.

graph

is logical. If TRUE the function plots Filed Tag distribution by Year graph. Default is graph = TRUE.

Value

The function fieldByYear returns a list containing threeobjects:

df		is a data frame
df_graph		is a data frame with data used to build the graph
graph		a ggplot object

See Also

biblioAnalysis function for bibliometric analysis

summary method for class 'bibliometrix'

Examples

data(management, package = "bibliometrixData")
timespan=c(2005,2015)
res <- fieldByYear(management, field = "ID", timespan = timespan, 
                    min.freq = 5, n.items = 5, graph = TRUE)