Categorical Variable/Data (or Nominal variable):
Such variables take on a fixed and limited number of possible values. For examples – grades, gender, blood group type etc. Also, in the case of categorical variables, logical order is not the same as categorical data e.g. “one”, “two”, “three”. But the sorting of these variables uses logical order. For example, gender is a categorical variable and has categories – male and female and there is no intrinsic ordering to the categories. A purely categorical variable is one that simply allows you to assign categories but you cannot clearly order the variables.
Terms related to Variability Metrics :
- Mode : Most frequently occuring value in the given data
Data = ["Car", "Bat", "Bat", "Car", "Bat", "Bat", "Bat", "Bike"] Mode = "Bat"
- Expected Value : When working in machine learning, categories have to be associated with a numeric value, so as to give understanding to the machine. This gives an average value based on a category’s probability of occurrence i.e. Expected Value.
It is calculated by –
-> Multiply each outcome by its probability of occurring. -> Sum these values
So, it is the sum of values times their probability of occurrence often used to sum up factor variable levels.
- Bar Charts : Frequency of each category plotted as bars.
Loading Libraries –
matplotlib.pyplot as plt
numpy as npchevron_right
Indexing Data –
"Total Labels : "
"Indexing : "
Total Labels : 6 Indexing : [0 1 2 3 4 5]
Bar Graph –
'No of Vehicles'
plt.xticks(index, label, fontsize
'Market Share for Each Genre 1995-2017'
- Pie Charts : Frequency of each category plotted as pie or wedges. It is a circular graph, where the arc length of each slice is proportional to the quantity it represents.
- Exploring Data Distribution | Set 1
- Exploring Data Distribution | Set 2
- Exploring Correlation in Python
- Python | Pandas.Categorical()
- Seaborn | Categorical Plots
- Python | Pandas Categorical DataFrame creation
- Difference between a Data Analyst and a Data Scientist
- Processing of Raw Data to Tidy Data in R
- Data Integration in Data Mining
- Data with Hadoop
- Youtube Data API | Set-1
- Youtube Data API | Set-2
- Python for Data Science
- ML | Understanding Data Processing
- Data Cleansing | Introduction
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