Presentation on theme: "Complex Spreadsheets George Holt"— Presentation transcript:
Complex Spreadsheets George Holt George.Holt@tafensw.edu.au
Introduction >Good Design >Evolving from Users to Designers >Why analysis is essential? >Research skills to survive >Advanced Functions –Named Cells and Ranges –Lookup Functions –Linking –Text functions –Date Functions –Data and Filtering >Testing
Good Spreadsheet Design? Good FeaturesBad Features Well Spaced out on pageIncorrect spelling Clearly labelledGridlines can crowd and confuse a page units of measurement are identified Small and congested layout Must be uniform and consistentConfusing flow of calculations or layout Clear Logical flowNot tested Headings for the page and sections
Problem Solving pitfalls Solving complex problems requires a plan. Issues that arise in complex problem solving include. >You should analyse the problem first on paper with a Inputs- Rules & processes – Outputs. >A mudmap can be used to plan a layout. >You must have a clear step by step plan. >You often have to break a big problem up into smaller chunks. >You must avoid mistakes and typos. Learn to proof read effectively. >If you get stressed it will adversely affect your logic. >A test and Revise method is usually more reliable than a one step brainstorming method.
Evolving from Users to Designers? >This unit of study is the first step in moving from a user or spreadsheets to a designer of spreadsheets >Designers apply more advanced analysis skills to create spreadsheets for other staff to use. User Designer
UsersDesigners What are the differences between Users and Designers?
Create a spreadsheet to simplify an existing manual process that they use Analyse and design a spreadsheet for others. Often on a situation they have never worked on before. Often label their spreadsheets poorly as they are the main ones using them. Create self explanatory spreadsheets for inexperienced users by adding labels, titles comments and notes Use the same basic features and avoid harder methods Research and find other functions and methods that they might find useful for the future See their job in isolation and mainly focus on their own needs See their job in the context of the whole organisation. ie: BIG PICTURE Error check their work on the go and often know when the answer is wrong as they are used to doing the job manually TEST their spreadsheets to ensure they are accurate and functional before they are used within the organisation. Seek help from other staff or trainers to use more advanced features Solve their own problems by using Help, books, websites etc Create simple standalone spreadsheetsCreate advanced spreadsheets that are often linked to other spreadsheet files and often use charting to communicate complex data as meaningful information. UsersDesigners The answer is Analysis!!
Why is analysis essential? >It gives us a structured way of solving problems >It provides a means of breaking big problems into much smaller sections >It helps us to communicate to others in our team and get their feedback on how we can improve our design >If we cant finish the design process another staff member can follow our plan and finish the job >It helps us to get the job right the first time
Research skills to survive Effective designers have good research skills and tend to solve their own problems: >Use Help effectively >Monitor websites and online newsletters >Analyse other designers spreadsheets >Use manuals and texts >Talk to other designers and share ideas
Advanced Functions –Named Cells and Ranges –Lookup Functions –Linking –Text functions –Date Functions –Data and Filtering
Named Cells and Ranges >Use plain English to create formulas. Eg >=IF(Gross>450,Gross*Super_Rate,"No Super") >=Hours*Pay_Rate >Individual cells or ranges of cells can be named
Lookup Functions Use Lookups to find the value for a particular criteria. This works especially well with named ranges >=Wage*VLOOKUP(Wage,Tax_Scale,2)
Linking >Linking provides a way to create relationships between spreadsheets. >Consider creating a spreadsheet to store costings and then have all of your other spreadsheets refer back to the costings sheet to get the most current data. Costings.xls Consumables Budget.xls Section Budget.xls
Text functions Text functions can be used to convert or display text in a variety of ways >=RIGHT(C7,7) displays 7 characters from the right. >=REPLACE(D6,5,1,"Dot") Replaces the decimal place with the word Dot.
Date Functions >Date Functions - format dates into different forms for calculations >Custom Formats – Change the appearance of dates >Calculations – Due date = Order date + 30
Data and Filtering >The Filter tool under the Data menu is fantastic for analysing large amounts of data. >Consider using filters in conjunction with macros and Charts to automate and provide a very clear visual image
Testing >It doesnt work until you prove it works!!! >Use simple test data where you already know the answers to TEST the system >You NEVER allow someone to use an untested product!!!
Conclusion >Evolving from Users to Designers >Why analysis is essential? >Research skills to survive >Advanced Functions –Named Cells and Ranges –Lookup Functions –Linking –Text functions –Date Functions –Data and Filtering >Testing
Spot the Dud - Formulas >D33+e32 >=A3xb3 >=a3*B3 >=b9\c10 >=b9/c10 >+ac32-da45 >=ac32-da45
BODMAS? >Whos body do you want buried where? Definitions of BODMAS on the Web: >A reminder of the order in which operations have to carried out when working with equations and formulas. Brackets Order Division Multiplication Addition Subtraction Sometimes also called BIDMAS, where I stands for Indices. www.lgfl.net/lgfl/leas/enfield/schools/southgate/accounts/staff/dwhitfield/web/pages/dictionary.html www.lgfl.net/lgfl/leas/enfield/schools/southgate/accounts/staff/dwhitfield/web/pages/dictionary.html
Formatting >Merge and Centre Headings >Consistent Decimals >Use colour but be careful when printing to Black and White printers >Use custom formats where required >Divide your worksheet up with borders >Be careful that your worksheet ends up fitting a page if required.
Layouts that work >Space your work out >Consider creating different sections for inputs, calculations and results >Use charts to illustrate complex data >Name worksheets descriptively >Create a Readme worksheet with notes on how the spreadsheet is to be used >Include comments in cells to explain the data or calculations
Pick the Duds – Maths and Formatting >Look at the..\..\George\Adv Spreadsheets\Pick the dud weather.xls..\..\George\Adv Spreadsheets\Pick the dud weather.xls >Be careful with Auto features like Autosum >Use consistent formatting with decimals >Make sure you include the complete range of cells >Use Headings to describe the data >Label all data and include units of measurement >Format dates carefully >Space your page out and differentiate between inputs, calculations and outputs(results)