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 Easy Meter

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)

 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

Cust IDNameAddr1Addr2CityStateZipPhone 0345Peter Parker765 Spider CoveNew YorkNY Mr. BiggMr. Bigg’s Wigs, Inc.CvilleVirginia MJ Watson th StApt 45New York Carl Zeithaml34 Sprigg LaneCharlottesvilleVA22904(434) Pete Parker765 Spider CoveNew YorkNY10012# Ben GrimmBroad and MainStauntonVA24403 null 0834Sue Storm8564 Carver Dr.NYCNYnull Peter Parker2345 Benson RdLos AngelesCA90210# StateIDState VAVirginia NYNew York WYnull

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

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

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

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 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?

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.

 From: #  To: (234)

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]

' 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()

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

 Video available  Come to the Lab

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

Dim myString As String = "# " Dim temp As String = "" For Each x As Char In myString If IsNumeric(x) Then temp = temp + x End If Next

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) + "."

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

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

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

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

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.

 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