I cannot move my x-axis to the Y = 0 - help

[Francesco1]

Hi there,

I am trying to move everything (X-axis line, text & ticks) to Y = 0 point?
How can I do this?
I used this: geom_hline(yintercept = 0) but I am not that happy with this solution.

Here is the code:

map(2016:2020, ~ make_returns(Data_m2, .x)) %>%
  do.call('rbind', .) %>%
  ggplot(aes(x = year_month, y = mean/100, colour = tercile)) + 
  ggplot(aes(x = year_month, y = mean/100, colour = tercile)) + 
  geom_line(aes(linetype=tercile))+
  scale_color_manual(name = "tercile", values = c("red", "blue"), labels = c("high CSR portfolio", "low CSR portfolio")) +
  scale_linetype_manual(name = "tercile", values = c("dashed", "solid"), labels = c("high CSR portfolio", "low CSR portfolio")) + 
  labs(x = "time", y = "market returns", title = "Portfolios' returns using Sustainalytics ESG total score", font.main=4, font.lab=4) +
  scale_x_date(breaks = as.Date(c("2016-01-31", "2017-01-31", "2018-01-31","2019-01-31", "2020-01-31", "2020-12-31")), date_labels = "%Y (%b)") +
  geom_vline(xintercept = as.Date(c("2017-01-31", "2017-01-31", "2018-01-31","2019-01-31", "2020-01-31")), linetype = 2) +
  scale_y_continuous(labels = scales::percent) +
  geom_hline(yintercept = 0) +
  theme_classic() + 
  theme(legend.position="bottom") +
  theme(legend.title=element_blank())

I would like to do something similar to this:

Thanks,

F

[nirgrahamuk]

library(tidyverse)

(mydata <- data.frame(x=-12:22,
                     y=sin(-12:22)))

#problem
ggplot(mydata,
        aes(x=x,y=y)) + geom_line()

#solution
ggplot(mydata,
       aes(x=x,y=y)) + geom_line() + 
  coord_cartesian(ylim=c(0,1))

[Matthias]

this just cuts off the negative values, I think francesco wants to keep it.
Actually it's not so easy, here is a similar, older question:

Moving X axis up/down

ok, it seems what you want is for the xaxis ticks labels and alls going through the midline of the plot. ggplot doesnt give elegant ways to do this at present. There are a bunch of proposals at : https://stackoverflow.com/questions/17753101/center-x-and-y-axis-with-ggplot2 I would probably try https://stackoverflow.com/a/49202967/11726436

[Francesco1]

@Moving X axis up/down

ms what you want is for the xaxis ticks labels and alls going through the midline of the plot. ggplot doesnt

That's okay. Another question is that I would like to add more values in my y-axis (e.g. I would like to insert the +/-5, +/- 15%. How can I do that in R?
This is how my image looks like.

Thanks,

F

[williaml]

Try the breaks argument in scale_y_continuous().

Position scales for continuous data (x & y) — scale_continuous