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2010session2

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Transcript

  • 1. CO4001 – Data Analysis Modelling 2 Charts, Text Box and Multiple worksheets
  • 2. Data Handling
    • Database
      • Record keeping
      • Add, delete, edit, select, sort
      • Avoid duplication of data
        • Enter once
        • Store in one place
        • Use in many ways and places
    • Spreadsheet
      • Algorithms (calculations, look-up, functions)
      • Primarily numeric data
      • Option to present results graphically
  • 3. Spreadsheet
    • Problem definition
    • Model
      • Constants
      • Variables
      • Parameters
    • Process model
      • Formulae
      • Functions
    • Human-Computer Interface
      • Data entry and validation
      • Results
      • Automation
    What many people find difficult
  • 4. Method
    • Design spreadsheet
    • Testing
      • Right answers when input variables change?
      • Is format OK?
    • Set input cells to initialised state and cursor to ‘home’
    • Protection
      • Unlock input cells then activate protection
    • Last check
      • Is it suitable for the user’s skill level?
      • Does it meet the user’s requirement?
    • Save spreadsheet
  • 5. Data
    • Variable
      • Value changes frequently
    • Constant
      • Value NEVER changes (e.g. number of days in a week)
    • Parameter
      • Value chosen for particular use of the spreadsheet (e.g. today’s date, number of people present)
  • 6. Table versus Chart?
    • A chart often presents information more clearly
    Jan Feb Mar Apr May Jun Total John 80 82 85 75 80 90 492 George 30 35 38 25 40 43 211 Sue 50 54 58 43 55 61 321 Sally 48 51 55 60 61 63 338
  • 7. Task 1 Table versus Chart?
    • Who has highest total sales? Who has lowest sales in March?
    • Who has highest sales in June? What is % share of total sales?
    Jan Feb Mar Apr May Jun Total John 80 82 85 75 80 90 492 George 30 35 38 25 40 43 211 Sue 50 54 58 43 55 91 321 Sally 48 51 55 60 61 63 338
  • 8. Who has highest total sales?
  • 9. Who has lowest sales in March? (rows in legend)
  • 10. Who has lowest sales in March? (columns in legend)
  • 11. Who has lowest sales in March? (stacked bar chart)
  • 12. What is % share of total sales?
  • 13. “ Horses for Courses” – choosing chart type Each person’s ‘share of the cake’ What has each person contributed to the total, month by month ? How do people compare, over time ?
  • 14. Create a column chart
  • 15. Column chart
  • 16. Chart Layout - Title and Axis labels
  • 17. Switch data – row to column
  • 18. Change style of chart
  • 19. Move chart to a chart sheet
  • 20. Name sheets
      • To improve the design of your spreadsheet give sheets meaningful names rather than sheet1 sheet2 etc
      • Click on sheet tab
      • Select Rename
      • Type new name
      • e.g. ToyData
  • 21. Change the chart type – Column to Bar
  • 22. Lies, Damn Lies, Statistics … and Charts
    • Scales can make the chart present a misleading view
  • 23. Text box to describe chart
      • In your assessment a text box containing justification for choice of chart is required
      • Move to required named sheet
      • Click Insert Text Box
      • Hairline appears drag and daw required bovx in required position
      • Enter text
  • 24. Multiple worksheets
      • In your assessment worksheets need to be named and linked
      • If data on toys on ToyData sheet and analysis to be on ToyAnalysis sheet
      • Move to ToyAnalysis sheet enter =AVERAGE(click on ToyData sheet, click list of toys required i.e. B4 to D4 close bracket)enter
      • =AVERAGE(ToyData!B4:D4) appears on ToyAnalysis sheet
  • 25. Workshop
    • Exercise 2.1 – Toys charts
    • Exercise 2.2 – Deliveries chart and text box
    • Exercise 2.3 – Ratio Analysis and multiple worksheets
    • Exercise 2.4 – Cars charts
    • Exercise 2.5 – Accounts charts