R help - Sep 2017 - Adding non-data line to legend ggplot2 Maximum Contaminant Level

Hello everyone,

I have a plot showing chloride concentrations for various point over time.
I also have a dotted line that show the Secondary Maximum Contaminant Level
(my screening limit) on the graphs at 250 mg/L.  But I can not figure out
how to include the dotted line / Secondary Maximum Contaminant Level in
the legend.  Any thoughts?  My code is as following and is linked to my
data on the net.

Thank you in advance
David


#Loads the ggplot2 package.
library(ggplot2)

##This loads your data from your worksheet
MyData
<-read.csv("http://doylesdartden.com/Stats/TimeSeriesExample.csv",
sep=",")


#Sets which are detections and nondetects

MyData$Detections <- ifelse(MyData$D_Chloride ==1, "Detected",
"NonDetect")

#does the plot
p <- ggplot(data = MyData, aes(x=Year, y=Chloride , col=Detections)) +
  geom_point(aes(shape=Detections)) +

  #sets the detect vs. non-detect colors
  scale_colour_manual(values=c("black","red")) +

  #sets the y scale and log base 10
  scale_y_log10() +

  ##adds line
  geom_hline(aes(yintercept=250),linetype="dashed")+

  #location of the legend
  theme(legend.position=c("right")) +

  #sets the line color, type and size
  geom_line(colour="black", linetype="dotted", size=0.5) +
  ylab("Chloride (mg/L)")

## does the graph using the Location IDs as the different Locations.
p + facet_grid(Location ~ .)

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I just glanced at the problem but I think you would have to create a new
variable to replace the hline. What about adding some text annotation in the
graph instead?
 

    On Tuesday, September 26, 2017, 3:51:46 PM EDT, David Doyle <kydaviddoyle
at gmail.com> wrote:
 
 Hello everyone,

I have a plot showing chloride concentrations for various point over time.
I also have a dotted line that show the Secondary Maximum Contaminant Level
(my screening limit) on the graphs at 250 mg/L.? But I can not figure out
how to include the dotted line / Secondary Maximum Contaminant Level in
the legend.? Any thoughts?? My code is as following and is linked to my
data on the net.

Thank you in advance
David


#Loads the ggplot2 package.
library(ggplot2)

##This loads your data from your worksheet
MyData
<-read.csv("http://doylesdartden.com/Stats/TimeSeriesExample.csv",
sep=",")


#Sets which are detections and nondetects

MyData$Detections <- ifelse(MyData$D_Chloride ==1, "Detected",
"NonDetect")

#does the plot
p <- ggplot(data = MyData, aes(x=Year, y=Chloride , col=Detections)) +
? geom_point(aes(shape=Detections)) +

? #sets the detect vs. non-detect colors
? scale_colour_manual(values=c("black","red")) +

? #sets the y scale and log base 10
? scale_y_log10() +

? ##adds line
? geom_hline(aes(yintercept=250),linetype="dashed")+

? #location of the legend
? theme(legend.position=c("right")) +

? #sets the line color, type and size
? geom_line(colour="black", linetype="dotted", size=0.5) +
? ylab("Chloride (mg/L)")

## does the graph using the Location IDs as the different Locations.
p + facet_grid(Location ~ .)

??? [[alternative HTML version deleted]]

______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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Well, here is one way but it seems a bit clumsy.
In words, I created a new data.frame with "250" in the Chloride vector
and "SMCL" in the Detections vector and supplessed one legend.
Warning: For my convenience I am using different data.frame names . 

library(ggplot2)

MyData
<-read.csv("http://doylesdartden.com/Stats/TimeSeriesExample.csv",
sep=",")

MyData$Detections <- ifelse(MyData$D_Chloride ==1, "Detected",
"NonDetect")


dat1 <-? MyData[, c(1, 3, 4, 6)]

dat2 <-? dat1[, c(1,2)]

dat2$Detections <-? rep("SMCL", nrow(dat2))
dat$Chloride <-? rep(250, nrow(dat2))

dat3 <-? rbind(dat1, dat2)

p <-? ggplot(dat3, aes(Year, Chloride, colour = Detections)) + 
?????????? geom_point(aes(shape=Detections), show.legend = F) +
?????????? geom_line( aes(Year, Chloride))

    On Tuesday, October 3, 2017, 3:17:00 PM EDT, David Doyle <kydaviddoyle at
gmail.com> wrote:
 
 Hi John,
I used your recommendation of adding a new variable (see below) and it is
plotting the line at the 250 mg/L mark but I still can not figure out how to get
it added to the legend.
Thanks again for your help.
David


#Loads the ggplot2 package.? NOTE you have to install it before
hand.library(ggplot2)
##This loads your data from your worksheetMyData
<-read.csv("http://doylesdartden.com/Stats/TimeSeriesExample.csv",
sep=",")

#Sets which are detections and nondetects
MyData$Detections <- ifelse(MyData$D_Chloride ==1, "Detected",
"NonDetect")
# adds my screening LevelMyData$SMCL <- rep(250, nrow(MyData))
#does the plotp <- ggplot(data = MyData, aes(x=Year, y=Chloride,
col=Detections)) +? geom_point(aes(shape=Detections)) +? geom_line(data =
MyData,aes(y=SMCL))+?? ?#sets the detect vs. non-detect colors?
scale_colour_manual(values=c("black","red")) +???? #sets the
y scale and log base 10? scale_y_log10() +??? #location of the legend???
theme(legend.position=c("right")) +??? #sets the line color, type and
size? geom_line(colour="black", linetype="dotted", size=0.5)
+?
? ylab("Chloride (mg/L)")
## does the graph using the Location IDs as the different Locations.p +
facet_grid(Location ~ .)

On Mon, Oct 2, 2017 at 5:09 AM, John Kane <jrkrideau at yahoo.ca> wrote:

MyData$newvar <- rep(250, nrow(MyData))
Again, I have not tried graphing this. 
 

    On Sunday, October 1, 2017, 10:38:09 PM EDT, David Doyle <kydaviddoyle at
gmail.com> wrote:
 
 Hi John,
How do I add a second y variable??ThanksDavid
On Sun, Oct 1, 2017 at 5:44 AM, John Kane <jrkrideau at yahoo.ca> wrote:

I just glanced at the problem but I think you would have to create a new
variable to replace the hline. What about adding some text annotation in the
graph instead?
 

    On Tuesday, September 26, 2017, 3:51:46 PM EDT, David Doyle <kydaviddoyle
at gmail.com> wrote:
 
 Hello everyone,

I have a plot showing chloride concentrations for various point over time.
I also have a dotted line that show the Secondary Maximum Contaminant Level
(my screening limit) on the graphs at 250 mg/L.? But I can not figure out
how to include the dotted line / Secondary Maximum Contaminant Level in
the legend.? Any thoughts?? My code is as following and is linked to my
data on the net.

Thank you in advance
David


#Loads the ggplot2 package.
library(ggplot2)

##This loads your data from your worksheet
MyData <-read.csv("http:// doylesdartden.com/Stats/
TimeSeriesExample.csv",
sep=",")


#Sets which are detections and nondetects

MyData$Detections <- ifelse(MyData$D_Chloride ==1, "Detected",
"NonDetect")

#does the plot
p <- ggplot(data = MyData, aes(x=Year, y=Chloride , col=Detections)) +
? geom_point(aes(shape= Detections)) +

? #sets the detect vs. non-detect colors
? scale_colour_manual(values=c(" black","red")) +

? #sets the y scale and log base 10
? scale_y_log10() +

? ##adds line
? geom_hline(aes(yintercept=250) ,linetype="dashed")+

? #location of the legend
? theme(legend.position=c(" right")) +

? #sets the line color, type and size
? geom_line(colour="black", linetype="dotted", size=0.5) +
? ylab("Chloride (mg/L)")

## does the graph using the Location IDs as the different Locations.
p + facet_grid(Location ~ .)

??? [[alternative HTML version deleted]]

______________________________ ________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/ listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/ posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
  

  


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