• Analyzed and visualized crime data in San Francisco based on 12 years of reports • Derived hourly trends for the crimes including period of day with highest and lowest rates • Explored police departments with higher crime rates and 5 top crime distributions

1. San Francisco Crime
Classification
RAHUL SINGH
Data Visualization Project
Tableau 10.3

2. Key Observations
• Crime rates steadily decreases
from 2003-2007
• Unusual spike in crimes in the
year 2008
• Decreasing pattern returns
• Reaches all time low of 66,542
Crime Incidents
Per Year
• Jump in crimes after 2011
• Reaches all time high of 75,606
in 2013
• Showing decrease but no more
data points to understand if its
decreasing or increasing

3. Key Observations
• Each year starts with a low
number of criminal incidents
• Around the middle of the year
in May and in October criminal
incidents shoot up
Crime Incidents
Per Month
• The incidents drop to a very
low value towards the end of
the year
• Possible reasons can be the
holiday season towards the end
of the year

4. An overview
of SF Crime Map
Before we start getting deeper lets look at the Criminal map of SF.
There are some colors which dominate the map. From an observers
perspective one can say that crimes like Assault, Burglary, Larceny/Theft
and Non-criminal look like some of the top criminal categories.

5. Key Observations
The high density dots in the map match most of the crimes which
make up the top 10 criminal categories in SF.
Top 10 Crimes to
look out for

6. Top 5 Crime
Categories
across SF
The categories are
distributed throughout
the geography of SF but
there are some parts of
the maps which show
some clusters.

7. The 10 Police
Department
Districts
Since the crimes are
locally reported a good
way to analyze the
impact of geography can
be from the PD District
perspective.

8. Key Observations
• Southern, Mission and
Northern are the top 3 PD
Districts with the highest
number of incidents reported
Top 3 PD Districts
and their top 5
crimes
• The three districts have four our of
their top 5 crimes in common-
Larceny/Theft, Other Offences,
Assault and Non-Criminal

9. Key Observations
• Larceny/Theft see a bump
during the end of the wee-
Friday and Saturday and falls
down Sunday onwards
Top 5 Crime
Incidents weekly
trend
• Non-criminal and Assault categories
also see a rise on weekends
• Other offenses and drug related
crimes actually go down as the
week ends

10. Hourly Crime
Occurrences
Majority of the
Crimes occur
during the evening
3pm-7pm and at
Noon
Crime Rates are
pretty low during
the early morning
hours 1am-7am
This trend is seen
all 7 days of the
week

11. Hourly Crime
Occurrences
Top 5 Crimes
during the peak
Crime Time 3pm-
7pm and at Noon
Top 5 Crimes during
the peak dormant
Crime Time 1am-
7am

12. PD Districts
Weekly
Analysis
Majority of the PD
districts see the
highest number of
incidents on Friday
Southern PD
districts has huge
number of
reporting's which is
a point to explore

13. PD Districts
during Peak
Hours (3pm-7pm)
We can similarly
check the districts
where the rest of
the crimes are
reported more
frequently
During peak crime
hours Central,
Northern and
Southern get the
highest reports of
Larceny/Theft

14. SUMMARY
 Crime rates overall are seeing a rise after falling down in the years 2008-09
 Top 5 Crimes-Larceny, Other Offences, Assault, Drug/Narcotics and Non-Criminal
 Larceny dominates the crime map of SF and is one of the top crimes in most of the
PD Districts including the top 3-Southern, Mission and Northern
 Southern PD District has the highest number of cases which is cause of concern
 A hourly trend was seen in the crimes:
• Crime rates go up during the evening period 3pm-7pm
• Crime rates are less dominant during the early hours of the morning 1am-7am