1. © Stefano Grazioli - Ask for permission for using/quoting: grazioli@virginia.edu

2.  Easy Meter

3. Analytics is “the extensive use of data, statistical and quantitative analysis, explanatory and predictive models, and fact-based management to drive decisions and actions” (Davenport and Harris – Competing on Analytics) “BI refers to the general ability to organize, access and analyze information in order to learn and understand the business.” (Gartner)

4.  Analysts cannot find what they need 50% of the times  10-25% of the records have inaccuracies or missing elements  Data is frequently misinterpreted  Data loss and theft  Most databases implement inconsistent definitions Source: T. Redman, Data Driven, 2008

5. Cust IDNameAddr1Addr2CityStateZipPhone 0345Peter Parker765 Spider CoveNew YorkNY10012875-3253 0346Mr. BiggMr. Bigg’s Wigs, Inc.CvilleVirginia22901434-567-3455 0467MJ Watson753 45 th StApt 45New York 10024999-9999 0488Carl Zeithaml34 Sprigg LaneCharlottesvilleVA22904(434)-453-3556 0499Pete Parker765 Spider CoveNew YorkNY10012#875-3253 0722Ben GrimmBroad and MainStauntonVA24403 null 0834Sue Storm8564 Carver Dr.NYCNYnull 212-450-3556 0853Peter Parker2345 Benson RdLos AngelesCA90210#875-3253 StateIDState VAVirginia NYNew York WYnull

6. High quality data Accurate Timely Valid Based on work by B. Wixom StrategyStrategy Data Use Business Value Usable data Awareness Access Usefulness Security Privacy Useful data Meaning Scope Sharing

7. No one gets up in the morning and says “I’m going to make lots of errors today” Source: T. Redman, Data Driven, 2008 Kathy Bessant

8. 1. Find and Fix 2. Prevent at the source 3. Do nothing (3M)

9. © Stefano Grazioli - Ask for permission for using/quoting: grazioli@virginia.edu

10.  You are an analyst at a broker firm. Many of our customers invest for short amounts of time on Google. They sell their shares within a few weeks…. I wonder: do they make any money out of it?

11. file with ~800 customers who bought and sold GOOG within the last two months. Three steps (and two homework) 1. Clean data: phones, dates 2. Compute Daily Cagr = [(final price/initial price) 1/days ]-1 3. Report the Average Daily Cagr across all customers.

12.  From: #2-345-3-48565  To: (234)-534-8565

13. When the user presses a button labeled “start”, a file selection windows pops out. The user selects a.csv file. The file is shown starting at “A1”. The start button becomes invisible. Three more buttons appear: “Clean phone numbers”, “Format Dates”, and “Compute Daily CAGR”. UML Activity Diagram - Daily Compound Average Growth of a Security (part I) Select the next phone no. Count its digits [Compute] [Exactly 10 digits] Next homework [Clean ph.no] Highlight the cell in red Format as (xxx)-xxx-xxxx & clear highlight if any [No More Ph.No] [Format Dates] A A Select the next column and/or date [is a date] Highlight the cell in yellow Format as mm/dd/yyyy & clear highlight if any [No More Dates in this column] A [No more columns]

14. ' store the address of the current active sheet, i.e., the ‘target’ Dim myActiveS As Excel.Worksheet = Application.ActiveSheet ' select a file Dim myFile As String = Application.GetOpenFilename() ' get the data in a new temporary workbook Application.Workbooks.OpenText(myFile,,, Excel.XlTextParsingType.xlDelimited,,,,, True) ' store the address of the temporary workbook Dim myActiveWB As Excel.Workbook = Application.ActiveWorkbook ' copy the content from the temporary to the ‘target’ sheet myActiveS.Range("A1:J1000").Value = Application.ActiveSheet.Range("A1:J1000").Value ‘ close the temp workbook myActiveWB.Close()

15. Dim lastRow As Integer lastRow = _ Cells(Rows.Count,1).End(Excel.XlDirection.xlUp).Row

16.  Video available  Come to the Lab

17. © Stefano Grazioli - Ask for permission for using/quoting: grazioli@virginia.edu

19. Dim myString As String = “This is a sample string" Dim myString2 As String = "s" Dim myChar As Char = "s"c

20. Dim myString As String = "#2344-234-33-3" Dim temp As String = "" For Each x As Char In myString If IsNumeric(x) Then temp = temp + x End If Next

21. Dim myS As String = "This is a sample string" myS = myS.Insert(4, "xyz") myS = myS.Remove(4, 3) 'starting where, how many myString = myS.Replace(" is", " was") myS = myS.Substring(0, 9) + “ another" + myS.Substring(10, 13) + "."

22. Dim myS As String = "This is a sample string" Dim myPosition As Integer = 0 myPosition = myS.IndexOf("s")

23. myLenght = myString.Length myNewString = myString.Trim() myNewString = myString.TrimEnd() myNewString = myString.TrimStart() myNewString = myString.PadLeft(50) myNewString = myString.PadRight(20) Total length of the result

24.  Name, major  Learning objectives  Things you like about the class  Things that can be improved  Strengths / Attitude towards the Tournament

25. Dim myDate As Date = "11/14/2002“ Year = myDate.Year Month = myDate.Month Day = myDate.Day DOW = myDate.DayOfWeek DOY = myDate.DayOfYear... MyDate Year Month Day Week....... 2002 11 14 45

26. Dim myDate1 As Date Dim myDate2 As Date Dim myTS As TimeSpan myDate1 = Range("A1").Value myDate2 = Range("A2").Value myTS = myDate2 - myDate1 Range("A3").Value = myTS.Days TIMESPAN Date1Date2 A TimeSpan represents the elapsed time between two dates.

27.  mySpan.Days gives you the total number of days  mySpan.TotalDays gives you the total number of days, plus a fraction of day based on the hours