How can I plot time series line plot of two variables in ggplot?

Question

I want to make a line plot of date versus Ydet and Yobs in ggplot, I have tried, but couldn't achieved it. Can anyone help, please?

> library(ggplot2) > #cbind Ydet and Yobs > Ydet.obs <- cbind(Ydet, Yobs) > #create ts object starting from 2001 > ts <- seq(as.POSIXct("2001-01-01"), length.out=nrow(Ydet.obs), by = "year") > Ydet.obs <- xts(Ydet.obs[], ts) > #extract date column > Ydet.obs <- data.frame('Date' = index(Ydet.obs), + coredata(Ydet.obs)) > head(Ydet.obs) Date Ydet Yobs 1 2001-01-01 5314 5215 2 2002-01-01 5683 5585 3 2003-01-01 5783 5690 4 2004-01-01 5816 5730 5 2005-01-01 6168 6084 6 2006-01-01 6057 5982

Can you please post dataset in a way, we can use it. Try function dput(Ydet.obs) and copy the output as code to your question. — Bloxx
– Bloxx, Commented Nov 25, 2021 at 21:13

Bloxx · Accepted Answer · 2021-11-25 21:30:13Z

There are several ways, but here is one simple:

colors <- c("Ydet" = "blue", "Yobs" = "red") ggplot(Ydet.obs, aes(x= Date)) + geom_line(aes(y =Ydet, color = "Ydet")) + geom_line(aes(y = Yobs, color = "Yobs")) + labs(x = "Year", y = "Value", color = "Legend") + scale_color_manual(values = colors)

Sarah · Accepted Answer · 2021-11-26 00:49:01Z

ggplot is really design to work with 'tidy' or long data frames, so convert your data first.

(see https://r4ds.had.co.nz/tidy-data.html)

I have made up highly simplified data as yours was not reproducible. Please see this post about making reproducibly data for asking questions in future: How to make a great R reproducible example

library(tidyr) library(ggplot2) Ydet.obs <- data.frame(Date = 1:5, Ydet =1:5, Yobs = 2:6) Ydet.obs_l <- Ydet.obs %>% pivot_longer(-Date ) ggplot(Ydet.obs_l ,aes(x = Date, y = value,colour = name))+geom_line()

^{Created on 2021-11-26 by the reprex package (v2.0.1)}

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