program-3

Author

Anshul

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implement an R function to generate a line graph depicting the trend of a time-series dataset with separate lines for each group, utilizing ggplot2’s group aesthetic.

STEP 1 :

library(ggplot2)
library(dplyr)


Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

library(tidyr)

STEP 2 : Load the built-in AirPassengers dataset

data<- data.frame(
  Date= seq(as.Date("1949-01-01"),
            by="month",
            length.out = length(AirPassengers)),
  Passengers = as.numeric(AirPassengers),
  Year = as.factor(format(seq(as.Date("1949-01-01"),by
                                     = "month", length.out = length(AirPassengers)), "%Y"))
)
#display first few row
head(data,n=20)

         Date Passengers Year
1  1949-01-01        112 1949
2  1949-02-01        118 1949
3  1949-03-01        132 1949
4  1949-04-01        129 1949
5  1949-05-01        121 1949
6  1949-06-01        135 1949
7  1949-07-01        148 1949
8  1949-08-01        148 1949
9  1949-09-01        136 1949
10 1949-10-01        119 1949
11 1949-11-01        104 1949
12 1949-12-01        118 1949
13 1950-01-01        115 1950
14 1950-02-01        126 1950
15 1950-03-01        141 1950
16 1950-04-01        135 1950
17 1950-05-01        125 1950
18 1950-06-01        149 1950
19 1950-07-01        170 1950
20 1950-08-01        170 1950

Step 3: plot the graph

#function to plot time-series
plot_time_series <- function(data,x_col,y_col,group_col, title="Air Passenger Trends"){
  ggplot(data,aes_string(x= x_col, y= y_col, color= group_col,group= group_col))+
    geom_line(size= 1.2)+
    geom_point(size= 2)+
    labs(title=title,
         x="Year",
         y="Number of Passenges",
         color= "Year")+
    
    theme_minimal()+
    theme(legend.position = "top")
}

plot_time_series(data, "Date", "Passengers","Year", "Trends of Airline Passengers Over Time")

Warning: `aes_string()` was deprecated in ggplot2 3.0.0.
ℹ Please use tidy evaluation idioms with `aes()`.
ℹ See also `vignette("ggplot2-in-packages")` for more information.

Warning: Using `size` aesthetic for lines was deprecated in ggplot2 3.4.0.
ℹ Please use `linewidth` instead.