yyplot画年度趋势（Y叔）

yyplot

yyplot的安装

## devtools::install_github('GuangchuangYu/yyplot')
library(yyplot)

选定一个需要搜寻的主题这里选择”breast cancer“，或者”Alzheimer“

term=c('breast cancer')

然后对数据统计，并画图

pm=pubmed_trend(term,year = 2001:2017)

## search term: breast cancer

## -> querying year 2001

## -> querying year 2002

## -> querying year 2003

## -> querying year 2004

## -> querying year 2005

## -> querying year 2006

## -> querying year 2007

## -> querying year 2008

## -> querying year 2009

## -> querying year 2010

## -> querying year 2011

## -> querying year 2012

## -> querying year 2013

## -> querying year 2014

## -> querying year 2015

## -> querying year 2016

## -> querying year 2017

plot(pm)

注意，这就是从pubmed上搜索的数目，未经任何处理，从此图可以看出总数是连年升高的，就两万多

接下来我们来看一下Alzheimer的历年研究，不过可惜的是，研究很少，甚至有下降的趋势，令人惋惜！

term=c('Alzheimer')
pm=pubmed_trend(term,year = 2001:2018)

## search term: Alzheimer

## -> querying year 2001

## -> querying year 2002

## -> querying year 2003

## -> querying year 2004

## -> querying year 2005

## -> querying year 2006

## -> querying year 2007

## -> querying year 2008

## -> querying year 2009

## -> querying year 2010

## -> querying year 2011

## -> querying year 2012

## -> querying year 2013

## -> querying year 2014

## -> querying year 2015

## -> querying year 2016

## -> querying year 2017

## -> querying year 2018

plot(pm)