1. 7 - 1 Lecture 5: Data Analysis for Modeling 7 - 1

2. Data Analysis in the Context of Modeling Supports the modeling process – Improves accuracy of model – Improves usefulness of conclusions Modeling is the primary goal. – Data analysis is a means to that goal. 7 - 2

3. Topics for Chapter Finding facts in databases – Editing, – Searching, – Sorting, – Filtering, and – Tabulating 7 - 3

4. Finding Facts from Databases Tables of information Each row is a record in the database. Each column is a field for the records. Excel calls such a table a list. 7 - 4

5. Excel Lists First row contains names for each field Each successive row contains one record. Lists may be: – Searched and edited – Sorted – Filtered – Tabulated 7 - 5

6. Searching and Editing Lists First assign a range name to entire list. – Include column titles. With list selected Form on the Quick Access Toolbar. Examine records one at a time: – Find Prev. – Find Next. – Enter new record with New button. – Delete record with Delete button. 7 - 6

7. Database Form 7 - 7

8. Criteria Button Selected Form on the Quick Access Toolbar Allows for searching of records – Enter data into a field. – Click Find Next. 7 - 8

9. Alternate Excel Search Techniques Highlight entire database. Home"Editing ► Find&Select ► Find. Use Find and Replace to edit entries. In Find and Replace – “?” stands for any single symbol – “*” stands for any sequence of symbols 7 - 9

10. Sorting: Data – Sort Command 7 - 10

11. Filtering Choose Home ► Editing ► Sort&Filter ► Filter. Will filter lists based on values  Found under arrow at the title of each column Arrow on title turns blue to remind list is filtered Can remove filter by:  Choose Home ► Editing ► Sort & Filter ► Filter ► Clear 7 - 11

12. More Filtering Top 10 option returns records with smallest or largest value of a numerical record Custom option allows filtering with compound criteria More complicated compound criteria can be achieved by clicking Custom Filter option under Number Filters or Text Filters. 7 - 12

13. Tabulating Select Data – Pivot Table. Creates summary tables Layout button on third step of wizard creates the format for the table 7 - 13