{"id":258053,"date":"2026-07-13T16:01:17","date_gmt":"2026-07-13T13:01:17","guid":{"rendered":"https:\/\/1kitap1.com\/en\/data-science-for-all-global-edition-brennan-davis\/"},"modified":"2026-07-13T16:01:17","modified_gmt":"2026-07-13T13:01:17","slug":"data-science-for-all-global-edition-brennan-davis","status":"publish","type":"post","link":"https:\/\/1kitap1.com\/en\/data-science-for-all-global-edition-brennan-davis\/","title":{"rendered":"Data Science For All Global Edition – Brennan Davis"},"content":{"rendered":"
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We can represent them in several ways. Often, they simply have no value. However, sometimes they appear as NULL, Unknown, — , or N\/A, which means \u201cnot avail- able\u201d or \u201cno value is available.\u201d Dataset: Customers Suppose Zahava wants to see if any customer postal codes are missing.<\/p>\n

She can ask for observations with no value for the PostalCode variable (i.e., the value is null , empty, or missing). Zahava asks you to retrieve all variables for observations where the postal code has no value. Query 5.7: What are the observations from the Customers table where the postal code ( PostalCode ) is missing? Questions Answer the following questions based on the results of Query 5.7.<\/p>\n

1. How many customers have no postal code listed in their observations? 2. Which country has the most missing data in PostalCode ? Tool Time\u2013Available in MyLab Statistics Excel Python StatCrunch Try It Yourself: Filter Missing Values Multiple Condition Filtering Sometimes, we want results based on several conditions. We may even like to filter observa- tions based on numerical and text variables.<\/p>\n

We can use many operators to query results this way, including AND and OR. Dataset: Products Zahava\u2019s products come in many sizes. A customer calls saying she cannot remember the name of a product that comes in 24 packs of 12 oz bottles and priced at $19 . Zahava asks you to query this. Query 5.8a: What are the observations from the Products table where the unit ( Unit ) is \u201c 24 – 12 oz bottles\u201d and the price ( Price ) is $19 ?<\/p>\n

She also wants to know the name of a product that comes in 24 packs of 12 oz bottles and priced at $14 . Query 5.8b: What are the observations from the Products table where the unit ( Unit ) is \u201c 24 – 12 oz bottles\u201d and the price ( Price ) is $14 ? Try It Yourself: Filter Multiple Conditions Simultaneously Ordering Observations Frequently, our queries concern the highest or lowest values of variables.<\/p>\n

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