# Tag: data scientist

### 3 Concepts Every Data Scientist Must Know Part – 3

- Naveen
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1. What is the significance of sampling? Name some techniques for sampling? For analyzing the data, we cannot proceed with the whole volume at once for large datasets. We need to take some samples from the data which can represent the whole population. While making a sample out of complete data, we should take the…

Read More### 3 Concepts Every Data Scientist Must Know Part – 2

- Naveen
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1. Bagging and Boosting Bagging and Boosting are two different ways used in combining base estimators for ensemble learning (Like random forest combining decision trees). Bagging means aggregating the predictions of several weak learners. We can think of it combining weak learners is used in parallel. The average of the predictions of several weak learners…

Read More### 3 Concepts Every Data Scientist Must Know Part – 1

- Naveen
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Central Limit Theorem We first need to introduce the normal (gaussian) distribution for central limit theorem to make sense. Normal distribution is a probability distribution that look like a bell. X-axis represents the values and y-axis represents the probability of observing these values. The sigma values represent standard deviation normal distribution is used to represent…

Read More### Difference between Data Scientist and Data Analyst

- Naveen
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What are their skills? Data Analyst Data Mining Data Warehousing Math, Statistics Tableau and data visualization SQL Business Intelligence Advanced Excel skills Data Scientist Data Mining Data Warehousing Math, Statistics, Computer Science Tableau and Data Visualization/Storytelling Python, R, JAVA, Scala, SQL, Matlab, Pig Economics Big Data/Hadoop Machine Learning Educational requirements Data Analyst Foundational math, statistics…

Read More### Difference between Data Scientist and Data Engineer

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What do they do? Data Engineers Data Engineers design, build, test, integrate, and optimize data collected from multiple sources. They use Big Data tools and technologies to construct free-flowing data pipelines that facilitate real-time analytics applications on complex data. Data Engineers also write complex queries to improve data accessibility. Data Scientist Data Scientists are more…

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