WHAT IS DATA SCIENCE? Grace Tang, Data Scientist, 99.co
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1 WHAT IS DATA SCIENCE? Grace Tang, Data Scientist, 99.co
2
3 WHAT IS DATA SCIENCE???
4 WHAT IS DATA SCIENCE??? What do YOU want to know about Data Science?
5 AGENDA Data Science in the Wild Data Analysis Big Data Tools of the Trade Data Scientists Data Science in Your Company
6 WHAT IS DATA SCIENCE? DATA SCIENCE IN THE WILD
7
8 WHAT IS DATA SCIENCE? RAW DATA VALUE Data Science is the extraction of VALUE from RAW DATA
9 TRENDS Source: mailchimp.com
10 DATA SCIENCE IN THE WILD DESCRIPTIVE Source: mailchimp.com
11
12 RECOMMENDATIONS Source: amazon.com
13 Source: linkedin.com
14 Source: 99.co
15 OUTLIER DETECTION Source: chase.com
16 A/B TESTING
17
18
19 WHAT IS DATA SCIENCE? DATA ANALYSIS
20 DATA MINING Extracting information and knowledge from data
21 DATA WRANGLING Extracting useable data from raw data csv JSO N Images Text
22 DATA ANALYSIS PIPELINE ANALYZE / INTERP
23 DATA ANALYSIS PIPELINE COLLECT EXTRACT CLEAN / AUGMENT ANALYZE / INTERP DATA WRANGLING
24 DATA ANALYSIS PIPELINE Data Collection What data will be useful? How will data be collected? How will it be stored?
25 DATA ANALYSIS PIPELINE Data Extraction Converting raw data into a more useable form
26 DATA ANALYSIS PIPELINE csv JSO N Images Text \
27 DATA WRANGLING - TEXT Source:
28 DATA WRANGLING - IMAGES Source: venturebeat.com
29 DATA CLEANING Inaccurate Information Error checking Typos: spell check Inaccuracies: outlier detection
30 DATA CLEANING Missing Information Imputation: Replace missing information with best guess User: Cheryl Interests: Clubbing, Instagram Gender:?? Age:??
31 DATA CLEANING Missing Information Imputation: Replace missing information with best guess Heuristic Mean Mode Regression
32 AUGMENTATION What is Cheryl s spending power?
33 AUGMENTATION
34 AUGMENTATION
35 DATA ANALYSIS PIPELINE Put everything together!
36 DATA ANALYSIS PIPELINE Exploit Analyze data to achieve business goals Descriptive
37 DATA ANALYSIS PIPELINE Exploit Analyze data to achieve business goals Descriptive Predictive
38 DATA ANALYSIS PIPELINE Exploit Analyze data to achieve business goals Descriptive Predictive Prescriptive
39 A/B TESTING
40 A/B TESTING
41
42
43 WHAT IS DATA SCIENCE? BIG DATA
44
45 BIG DATA Traditional data analysis Data Results Analyze
46 BIG DATA Big data Data Analyze
47 BIG DATA Big data Data
48 BIG DATA Too big for one machine - not enough storage - not enough memory / computational power
49 BIG DATA WHY IS IT SO BIG NOW? VOLUME VARIETY VELOCITY
50 BIG DATA WHY IS IT SO BIG NOW?
51
52 BIG DATA WHY IS IT SO BIG NOW?
53 BIG DATA WHY IS IT SO BIG NOW?
54 BIG DATA Need for scalable Storage Unstructured Lots of it Computation
55 BIG DATA Source: Google
56 BIG DATA Too Small Data Statistical significance Cold-start problem To predict user behavior, you must first have user behavior
57
58 WHAT IS DATA SCIENCE? TOOLS OF THE TRADE
59 TOOLS OF THE TRADE A tool for everything.. Data collection Storage Visualization Statistics A/B testing Machine learning
60 TOOLS OF THE TRADE Services Out-of-the-box Customer Support Paid Not customized Programs Expertise required Community Support Free Highly customizable
61 ANALYSIS PLATFORMS
62 ANALYSIS PLATFORMS Events Traffic User acquisition, flow, segmentation Ad campaign performance Basic A/B testing
63 ANALYSIS PLATFORMS $$$
64
65
66 A/B TESTING $$$
67
68 CLOUD SERVICES Cloud storage Cloud computing Machine Learning as a Service
69 ANALYSIS / VISUALIZATION $0
70
71 TOOLS OF THE TRADE - ANALYSIS / VISUALIZATION $0
72 BIG DATA $$$
73 WHAT IS DATA SCIENCE? DATA SCIENTISTS
74 source: grey s anatomy
75 DATA SCIENTISTS Skills Statistics / Research Business skills / Domain knowledge Programming / Computer science
76 DATA SCIENTISTS Data Engineers Programming Computer Science Storage architecture Data collection
77 Source: engineering.viki.com
78 DATA ENGINEERS How do I... make sure data is never lost? collect and store LOTS of different types of data? make it easy for people to access and analyze the data?
79 DATA SCIENTISTS Software developers Programming Computer Science Algorithm design Runtime optimization
80 Source: linkedin.com
81 SOFTWARE DEVELOPERS How do I... make accurate predictions? make real-time predictions fast?
82 DATA SCIENTISTS Sources Programming Computer Science Computer science background architecture, infrastructure artificial intelligence, algorithm design
83 DATA SCIENTISTS Business analysts Business skills Domain knowledge Specialized knowledge of the field Data visualization Communication
84
85 BUSINESS ANALYSTS How do I... visualize the data? generate actionable insights? communicate results?
86 DATA SCIENTISTS Sources Business skills Domain knowledge Business background
87 DATA SCIENTISTS Researchers Statistics Research Conduct experiments Evaluate effectiveness of features and algorithms
88 A/B TESTING
89 A/B TESTING
90 DATA SCIENTISTS How do I... formulate a hypothesis? test the hypothesis? determine if results are significant?
91 DATA SCIENTISTS Sources Statistics Research Academic background
92 WHAT IS DATA SCIENCE? DATA SCIENCE IN YOUR COMPANY
93 DATA SCIENCE IN YOUR COMPANY What problems do you want to solve? Do you need data scientists? What kind of data scientist(s) do you need? Big vs. small companies
94 DATA SCIENCE IN YOUR COMPANY What do you want to achieve with data science? Insights? Data visualization? Optimize your product? A/B testing? Predictive algorithms? Recommendation systems?
95 DATA SCIENCE IN YOUR COMPANY What do you want to achieve with data science? Insights? Data visualization? - Google Analytics Optimize your product? A/B testing? - Optimizely Predictive algorithms? Recommendation systems?
96 DATA SCIENCE IN YOUR COMPANY Data scientist vs services Data scientists Need a salary Understand your product and business goals intim Equipped to identify solutions for problems unique
97 DATA SCIENCE IN YOUR COMPANY Data scientist vs services Services Do not need a salary Horizontal: Build general solutions Still have to spend time learning tools and underst Still cost money
98 DATA SCIENTISTS Specialist? Statistics / Research All-rounder? Business skills Programming
99 DATA SCIENCE IN YOUR COMPANY Big companies More resources Dedicated teams for each part of the pipeline DATA ENGINEERS SOFTWARE DEVELOPERS - Storage architecture - Algorithm development - Data collection, cleaning, wrangling RESEARCHER - Feature evaluation
100 DATA SCIENCE IN YOUR COMPANY Small companies Fewer resources Data scientist might have to manage the entire pipe DATA SCIENTIST - Everything
101 DATA SCIENCE IN YOUR COMPANY Hiring Define what you need What problem do you want to solve? How much can your existing team already do? Determine required skill set Multi-tasker? Specialist?
102 WHAT IS DATA SCIENCE? Q&A
103
104 WHAT IS DATA
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