[R] ggplot2: Plot multiple lines using stacked data.

[@vi@e@gross m@iii@g oii gm@ii@com]

John,

I hate to break it to you that ggplot2 is not part of base R. "plot" and
maybe lattice qualify.

But I can work with you. Try this:

ggplot(data=mydata, 
       aes(x=AQIGroup,
           y=Freq,
           group=Day,
           color=Day)) +
  geom_point() +
  geom_line()

The main change besides naming arguments for clarity, is adding what it
should be grouped by. I believe you want it grouped by day, but am not
totally sure except that the grouping was not done by your last line that
sort of changed the x,y back to what it would be anyway.

-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of Sorkin, John
Sent: Thursday, December 5, 2024 8:38 PM
To: r-help using r-project.org (r-help using r-project.org) <r-help using r-project.org>
Subject: [R] ggplot2: Plot multiple lines using stacked data.

I am trying to use ggplot2 to create a figure with multiple lines, one line
for each value of the variable Day. Each group of data for Day requires
seven lines. The dataframe has data for 4 days and thus 4*7=28 lines.

I can create a plot, but the plot only contains dots. The dots for each day
should be connected each day's data by a different line. There should be a
total of four lines on the graph 

mydata <-structure(list(Day = c("25", "25", "25", "25", "25", "25", "25", 
                       "26", "26", "26", "26", "26", "26", "26", "27", "27",
"27", "27", 
                       "27", "27", "27", "28", "28", "28", "28", "28", "28",
"28"), 
               AQIGroup = structure(c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L, 2L, 
                        3L, 4L, 5L, 6L, 7L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 1L,
2L, 3L, 
                        4L, 5L, 6L, 7L), levels = c("Good", "Moderate",
"UnForSome", 
                        "UH", "VUH", "Haz1", "Hax2"), class = "factor"),
Freq = c(98.05, 
                         0.37, 0.27, 0.17, 0.26, 0.5, 0.38, 93.34, 4.34,
0.75, 0.42, 
                         0.44, 0.44, 0.27, 89.57, 7.8, 0.98, 0.38, 0.5,
0.52, 0.25, 
                        80.43, 13.33, 3.85, 0.76, 0.86, 0.28, 0.49)), class
= "data.frame", row.names = c(NA, -28L))

# You can see that the data are stacked, one day on top of the next.
# Each day requires seven lines.
mydata

# Load ggplot2
if(!require(ggplot2)) {install.packages(ggplot2)}
library(ggplot2)
# Create a graph, with multiple lines, one line for each value of Day.
ggplot(mydata, aes(AQIGroup,Freq,color=Day)) +
  geom_point()+
  geom_line(aes(AQIGroup,Freq))

Thank you,
John


John David Sorkin M.D., Ph.D.
Professor of Medicine, University of Maryland School of Medicine;
Associate Director for Biostatistics and Informatics, Baltimore VA Medical
Center Geriatrics Research, Education, and Clinical Center; 
PI Biostatistics and Informatics Core, University of Maryland School of
Medicine Claude D. Pepper Older Americans Independence Center;
Senior Statistician University of Maryland Center for Vascular Research;

Division of Gerontology and Paliative Care,
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
Cell phone 443-418-5382



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