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Project: Analyzing Crime in Los Angeles
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  • Los Angeles, California 😎. The City of Angels. Tinseltown. The Entertainment Capital of the World!

    Known for its warm weather, palm trees, sprawling coastline, and Hollywood, along with producing some of the most iconic films and songs. However, as with any highly populated city, it isn't always glamorous and there can be a large volume of crime. That's where you can help!

    You have been asked to support the Los Angeles Police Department (LAPD) by analyzing crime data to identify patterns in criminal behavior. They plan to use your insights to allocate resources effectively to tackle various crimes in different areas.

    The Data

    They have provided you with a single dataset to use. A summary and preview are provided below.

    It is a modified version of the original data, which is publicly available from Los Angeles Open Data.

    crimes.csv

    ColumnDescription
    'DR_NO'Division of Records Number: Official file number made up of a 2-digit year, area ID, and 5 digits.
    'Date Rptd'Date reported - MM/DD/YYYY.
    'DATE OCC'Date of occurrence - MM/DD/YYYY.
    'TIME OCC'In 24-hour military time.
    'AREA NAME'The 21 Geographic Areas or Patrol Divisions are also given a name designation that references a landmark or the surrounding community that it is responsible for. For example, the 77th Street Division is located at the intersection of South Broadway and 77th Street, serving neighborhoods in South Los Angeles.
    'Crm Cd Desc'Indicates the crime committed.
    'Vict Age'Victim's age in years.
    'Vict Sex'Victim's sex: F: Female, M: Male, X: Unknown.
    'Vict Descent'Victim's descent:
    • A - Other Asian
    • B - Black
    • C - Chinese
    • D - Cambodian
    • F - Filipino
    • G - Guamanian
    • H - Hispanic/Latin/Mexican
    • I - American Indian/Alaskan Native
    • J - Japanese
    • K - Korean
    • L - Laotian
    • O - Other
    • P - Pacific Islander
    • S - Samoan
    • U - Hawaiian
    • V - Vietnamese
    • W - White
    • X - Unknown
    • Z - Asian Indian
    'Weapon Desc'Description of the weapon used (if applicable).
    'Status Desc'Crime status.
    'LOCATION'Street address of the crime.
    # Re-run this cell
    # Import required libraries
    import pandas as pd
    import numpy as np
    import matplotlib.pyplot as plt
    import seaborn as sns
    crimes = pd.read_csv("crimes.csv", parse_dates=["Date Rptd", "DATE OCC"], dtype={"TIME OCC": str})
    crimes.head()
    # Import required libraries
    import pandas as pd
    import numpy as np
    import matplotlib.pyplot as plt
    import seaborn as sns
    
    # Read in and preview the dataset
    crimes = pd.read_csv("crimes.csv", parse_dates=["Date Rptd", "DATE OCC"], dtype={"TIME OCC": str})
    crimes.head()
    
    ## Which hour has the highest frequency of crimes? Store as an integer variable called peak_crime_hour
    
    # Extract the first two digits from "TIME OCC", representing the hour,
    # and convert to integer data type
    crimes["HOUR OCC"] = crimes["TIME OCC"].str[:2].astype(int)
    
    # Preview the DataFrame to confirm the new column is correct
    crimes.head()
    
    # Produce a countplot to find the largest frequency of crimes by hour
    sns.countplot(data=crimes, x="HOUR OCC")
    plt.show()
    
    # Midday has the largest volume of crime
    peak_crime_hour = 12
    
    ## Which area has the largest frequency of night crimes (crimes committed between 10pm and 3:59am)? 
    ## Save as a string variable called peak_night_crime_location
    # Filter for the night-time hours
    # 0 = midnight; 3 = crimes between 3am and 3:59am, i.e., don't include 4
    night_time = crimes[crimes["HOUR OCC"].isin([22,23,0,1,2,3])]
    
    # Group by "AREA NAME" and count occurrences, filtering for the largest value and saving the "AREA NAME"
    peak_night_crime_location = night_time.groupby("AREA NAME", 
                                                   as_index=False)["HOUR OCC"].count().sort_values("HOUR OCC",
                                                                                                   ascending=False).iloc[0]["AREA NAME"]
    # Print the peak night crime location
    print(f"The area with the largest volume of night crime is {peak_night_crime_location}")
    
    ## Identify the number of crimes committed against victims by age group (<18, 18-25, 26-34, 35-44, 45-54, 55-64, 65+) 
    ## Save as a pandas Series called victim_ages
    # Create bins and labels for victim age ranges
    age_bins = [0, 17, 25, 34, 44, 54, 64, np.inf]
    age_labels = ["<18", "18-25", "26-34", "35-44", "45-54", "55-64", "65+"]
    
    # Add a new column using pd.cut() to bin values into discrete intervals
    crimes["Age Bracket"] = pd.cut(crimes["Vict Age"],
                                   bins=age_bins,
                                   labels=age_labels)
    
    # Find the category with the largest frequency
    victim_ages = crimes["Age Bracket"].value_counts()
    print(victim_ages)