Assignment #7

Stars! Assignment #7

For this assignment, I am using the stars dataset in the dslabs package. Based on the view and summary function I used below, the variables of this dataset are star name, magnitude, temperature, and type.

#download and install packages and library
library(dslabs)
data("stars") 
summary(stars)

          star      magnitude           temp              type   
 Altair     : 2   Min.   :-8.000   Min.   : 2500   Length   :96  
 *40EridaniA: 1   1st Qu.:-1.800   1st Qu.: 3168   N.unique :10  
 *40EridaniB: 1   Median : 2.400   Median : 5050   N.blank  : 0  
 *40EridaniC: 1   Mean   : 4.257   Mean   : 8752   Min.nchar: 1  
 *61CygniA  : 1   3rd Qu.:11.325   3rd Qu.: 9900   Max.nchar: 2  
 *61CygniB  : 1   Max.   :17.000   Max.   :33600                 
 (Other)    :89                                                  

#View(stars)

#treemap
library(treemap)
#data source:https://cran.r-project.org/web/packages/dslabs/index.html"

treemap(stars,
        index = "star",
        vSize = "temp",
        vColor = "temp",
        type = "value",
        title = "Temperature of Stars in Our Solar System",
        palette = "RdYlBu") #Found on here: https://r-graph-gallery.com/38-rcolorbrewers-palettes.html

library(ggplot2)
ggplot(data = stars, aes(x = temp, y = magnitude, color = type)) +
  geom_point(shape = 8, size = 3) + #make them star shaped
  theme_light() +
  labs(title = "Temperature and Magnitude of Stars based on Type", caption = "Source: DSLABS")

For this assignment, I am using the stars dataset in the dslabs package. Based on the view and summary function I used below, the variables of this dataset are star name, magnitude, temperature, and type. In this scatter plot, each plot represents a star. The color of the plot indicates the type of star. There is a strong connection between the magnitude, temperature and star type. This is evident by the clusters of the same color. The results are logical since star types are determined by temperature and luminosity, so stars with similar temperature and magnitude would likely be categorized as the same type of star.