Hello,
This type of problem is almost always a data reshaping problem.
ggplot graphics work better if the data is in the long format and you
have 3 columns for counts, one column for each category. If you reformat
from the current wide format to the long format you will have a date
vector, a categorical variable and a counts variable.
In the code below just change geom_point to geom_line and the problem is
solved.
library(tidyverse)
library(lubridate)
datO <- read.csv("https://api.covidtracking.com/v1/states/oh/daily.csv";)
datO[ ,1] <- ymd(datO[ ,1])
dfO <- tibble::as_tibble(data.frame(date = datO[ ,"date"],
positive = datO[ ,"positive"],
negative = datO[ ,"negative"],
total = datO[ ,"total"]))
dfO %>%
pivot_longer(
cols = -date,
names_to = "cases",
values_to = "count"
) %>%
mutate(cases = factor(cases, levels = c("positive", "negative",
"total"))) %>%
ggplot(aes(date, count, color = cases)) +
geom_point() +
scale_color_manual(name = "Test",
labels = c("Positive", "Negative", "Total"),
values = c("red", "blue", "green")) +
ylim(0, 1750000) +
labs(x = "Date", y = "Number of Tests")+
ggtitle("COVID-19 Tests in Ohio \n (8/15/20)")+
theme_bw() +
theme(axis.text.x = element_text(angle = 30, hjust = 1),
plot.title = element_text(hjust = 0.5))
Hope this helps,
Rui Barradas
Às 02:00 de 17/08/20, Stephen P. Molnar escreveu:
I have cobbled together a short script to plot Covid-19 data.
setwd("~/Apps/Models/1-CoronaVirus")
library(tidyverse)
library(lubridate)
datO <- read.csv("https://api.covidtracking.com/v1/states/oh/daily.csv";)
datO[ ,1] <- ymd(datO[ ,1])
dfO <- tibble::as_tibble(data.frame(datO[ ,"date"],datO[
,"positive"],datO[ ,"negative"],datO[ ,"total"]))
dfO %>%
ggplot(aes(x = datO[ ,"date"],y = datO[ ,"positive"]))+
geom_point(color = 'red', size = 0.025)+
geom_point(y = datO[ ,"negative"], color = 'blue', size = 0.025)+
geom_point(y = datO[ ,"total"], color = "green", size = 0.025)+
theme(axis.text.x = element_text(angle=30, hjust=1))+
theme_bw()+
scale_y_continuous(limits = c(0,1750000))+
labs(x = "Date", y = "Number of Tests")+
ggtitle("COVID-19 Tests in Ohio \n (8/15/20)")+
theme(plot.title = element_text(hjust = 0.5))+
scale_fill_discrete(name = "Test", labels = c("Positive", "Negative",
"Total"))
Here is the plot:
but, if I want lines rather that the code (the aspplicable plines) uis:
ggplot(aes(x = datO[ ,"date"],y = datO[ ,"positive"]))+
geom_line(linetype = "solid",color = 'red')+
geom_line(linetype = "dotdash",y = datO[ ,"negative"], color = 'blue')+
geom_line(linetype = "twodash",y = datO[ ,"total"], color = "green")+
Now two of the plots are reversed. Google has not been a friend in
finding a solution.
Help will be much appreciated.
Thanks in advance
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