What is Data Science?

What is Data Science?

Data Science is about data gathering, analysis, and decision-making.

Data Science is about finding patterns in data, through analysis, and make future predictions.

By using Data Science, companies are able to make:

Better decisions (should we choose A or B)
Predictive analysis (what will happen next?)
Pattern discoveries (find a pattern, or maybe hidden information in the data)

How Does a Data Scientist Work?

A Data Scientist requires expertise in several backgrounds:

Machine Learning
Statistics
Programming (Python or R)
Mathematics
Databases

A Data Scientist must find patterns within the data. Before he/she can find the patterns, he/she must organize the data in a standard format.

Here is how a Data Scientist works:

Ask the right questions - To understand the business problem.
Explore and collect data - From the database, weblogs, customer feedback, etc.
Extract the data - Transform the data to a standardized format.
Clean the data - Remove erroneous values from the data.
Find and replace missing values - Check for missing values and replace them with a suitable value (e.g. an average value).
Normalize data - Scale the values in a practical range (e.g. 140 cm is smaller than 1,8 m. However, the number 140 is larger than 1,8. - so scaling is important).
Analyze data, find patterns and make future predictions.
Represent the result - Present the result with useful insights in a way the "company" can understand.

Comments

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Pattern #1: 1 1 2 1 1 2 3 2 1 1 2 3 4 3 2 1 1 2 3 4 5 4 3 2 1 code:- n = 5 for i in range(1,n+1): for j in range(1,–i): print(j,end=” “) for k in range(–i,0,-1): print(k,end=” “) print(“\n”) Pattern #2: 5 4 3 2 1 1 2 3 4 5 5 4 3 2 2 3 4 5 5 4 3 3 4 5 5 4 4 5 5 5 code:- n = 6 for i in range(0,n): for j in range(n-1,i,-1): print(j,end=” “) for k in range(i+1,n): print(k,end=” “) print(“\n”) Pattern #3: 5 5 5 5 5 4 4 4 4 3 3 3 2 2 1 code:- n = 5 for i in range(n,0,-1): for j in range(i): print(i,end=” “) print(“\n”) Pattern #4: 1 2 3 4 5 2 2 3 4 5 3 3 3 4 5 4 4 4 4 5 5 5 5 5 5 code:- n = 5 for i in range(1,n+1): for j in range(1,n+1): if j <= i: print(i, end=’ ‘) else: print(j, end=’ ‘) print() Pattern #5: 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 code:- n = 5 for i in range(n,0,-1): for j in range(i): print(n,end=” “) print(“\n”) for i in range(1,n+1): for j in range(i): print(n,end=” “) print(“\n”)

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