Caulkins, Morrison, & Weidemann (2006)People tend to believe their spreadsheets are more accurate than they really are.

Colbenz (2005)Errors in spreadsheets are as ubiquitous as spreadsheets themselves.

Caulkins, Morrison, & Weidemann (2008)Spreadsheets are commonly used and commonly flawed.

Beaman, et al (2005)Errors in spreadsheets... result in incorrect decisions being made and significant losses incurred.

Csernoch & Biro (2013)Studies have shown that there is a high incidence of errors in spreadsheets.

Nixon & O'Hara (2010)Spreadsheet errors are still the rule rather than the exception.

Sajaniemi (1998)The results given by spreadsheets are often just wrong.

Chen & Chan (2000)Spreadsheets are easy to use and very hard to check.

Cunha, et al (2011)Spreadsheets are notoriously error-prone.

Chadwick (2002)Spreadsheet errors... a great, often unrecognised, risk to corporate decision making & financial integrity.

Bishop & McDaid (2007)The quality and reliability of spreadsheets is known to be poor.

Nixon & O'Hara (2010)It is now widely accepted that errors in spreadsheets are both common and potentially dangerous.

Mireault (2015)Developing an error-free spreadsheet has been a problem since the beginning of end-user computing.

Durusau & Hunting (2015)Spreadsheets are dangerous to their authors and others.

Hermans & van der Storm (2015)Spreadsheets are the most popular live programming environments, but they are also notoriously fault-prone.

Panko (2015)Research on spreadsheet errors is substantial, compelling, and unanimous.

Abreu, et al (2015)Despite being staggeringly error prone, spreadsheets are a highly flexible programming environment.

Price (2006)The untested spreadsheet is as dangerous and untrustworthy as an untested program.

Paine (2001)Spreadsheets are alarmingly error-prone to write.

Panko (2008)94% of the 88 spreadsheets audited in 7 studies have contained errors.

Panko (2007)The issue is not whether there is an error but how many errors there are and how serious they are.

Teo & Tan (1999)Most executives do not really check or verify the accuracy or validity of [their] spreadsheets...

Panko & Ordway (2005)Most large spreadsheets have dozens or even hundreds of errors.

Galletta, et al (1993)Even obvious, elementary errors in very simple, clearly documented spreadsheets are... difficult to find.

Abraham & Erwig (2007)Spreadsheet errors have resulted in huge financial losses.

Raffensperger (2001)Never assume a spreadsheet is right, even your own.

Burnett & Myers (2014)The software that end users are creating... is riddled with errors.

Bock (2016)Spreadsheet development must embrace extensive testing in order to be taken seriously as a profession.

Miller (2005)Untested spreadsheets are riddled with errors.

Panko (2013)It is irrational to expect large error-free spreadsheets.

Panko & Halverson (1996)Every study that has looked for errors has found them... in considerable abundance.

Caulkins, Morrison, & Weidemann (2006)Your spreadsheets may be disasters in the making.

Krishna, et al (2001)Programmers exhibit unwarranted confidence in the correctness of their spreadsheets.

Irons (2003)Spreadsheet errors are pervasive, stubborn, ubiquitous and complex.

Abreu, et al (2015)Spreadsheets can be viewed as a highly flexible programming environment for end users.

Kruck & Sheetz (2001)...few incidents of spreadsheet errors are made public and these are usually not revealed by choice.

Kulesz & Ostberg (2013)Spreadsheets are more fault-prone than other software.

Howard (2005)Spreadsheets... pose a greater threat to your business than almost anything you can imagine.

Mireault & Gresham (2015)Spreadsheets are often hard, if not impossible, to understand.

Panko (1999)Every study, without exception, has found error rates much higher than organizations would wish to tolerate.

Panko (2014)Despite overwhelming and unanimous evidence... companies have continued to ignore spreadsheet error risks.

Sakal, et al (2015)Overconfidence is one of the most substantial causes of spreadsheet errors.

Reschenhofer & Matthes (2015)Spreadsheet shortcomings can significantly hamper an organization's business operation.

Rust, et al (2006)Spreadsheets have a notoriously high number of faults.

Dunn (2010)Spreadsheets are extraordinarily and unacceptably prone to error.

Ayalew (2007)A significant proportion of spreadsheets have severe quality problems.

Abraham, et al (2005)Spreadsheets contain errors at an alarmingly high rate.

Powell, Baker, & Lawson (2009)1% of all formulas in operational spreadsheets are in error.

Murphy (2007)60% of large companies feel 'Spreadsheet Hell' describes their reliance on spreadsheets.

Ross (1996)A lot of decisions are being made on the basis of some bad numbers.

20 April 2017

The tutorial explains the basics of lookup in Excel, shows the strengths and weaknesses of each Excel lookup function and provides a number of examples to help you decide which lookup formula is best to be used in a particular situation.

The lookup functions discussed are:

`LOOKUP`

.`VLOOKUP`

.`HLOOKUP`

.`VLOOKUP MATCH`

.`HLOOKUP MATCH`

.`OFFSET MATCH`

.`OFFSET MATCH MATCH`

.`INDEX MATCH`

.`INDEX MATCH MATCH`

.

7 April 2017

This article explains how to consolidate data from numerous Excel files using Power Query.

The situation:

- A folder contains hundreds of Excel files.
- New workbooks can be added to the folder, or some workbooks can be removed.
- Workbooks do not contain the same number of worksheets.
- Worksheets may be added or removed at any time.
- There is no naming convention for the worksheets.
- Each worksheet may contain one or more values to retrieve.
- The data needs to be consolidated often.

The solution: Use Power Query to import and consolidate the data automatically.

24 March 2017

This tutorial explains the basics of the Excel `HYPERLINK`

function and provides a few tips and formula examples to use it most efficiently.

Topics include:

- Excel
`HYPERLINK`

function - syntax and basic uses. - How to use
`HYPERLINK`

in Excel - formula examples. - Create hyperlinks to different items.
`VLOOKUP`

and insert a hyperlink to the first match.- How to edit multiple
`HYPERLINK`

formulas at a time. - Excel
`HYPERLINK`

not working - reasons and solutions.

18 March 2017

New in Excel 2016 (for Office 365 subscription users only) are Map Charts.

Excel map charts can display your data encoded by:

- Values with a 2-color scale.
- Values with a 3-colour diverging scale.
- By category.

This article shows some examples of how to create and format Excel map charts.

25 February 2017

This post poses a problem: create a unique list in Excel based on criteria. Rather than just presenting a solution, the author helpfully walks us through how to understand the complicated formula that solves the problem.

The key point is that if you find a formula online and simply copy / paste it without understanding how it works, you limit yourself from the power it has, and therefore, you limit the power that you have.

23 February 2017

Here is a simple checklist to double check your Excel formulas work:

- Are you mixed up?
- Roughly know what your answer should be.
- Check the order of precedents or operations.
- Switch your view to show formulas.
- Ensure all formula arguments are accounted for.

18 February 2017

This article provides a comprehensive guide to Excel's custom number formatting feature.

Topics include: creating and applying custom number formats, structure of custom number formats, placeholders, colors, text/labels, repeating text, and using symbols in custom number formats.

21 January 2017

Understanding the order and precedence of operations in mathematical formulas or in an Excel Formula is very important.

Excel has a total 17 operators that you can use to build complex Excel formulas. Which operator will be evaluated first depends on the precedence of the operator.

This article describes the order of precedence for each of the Excel operators, including how to control the order using parentheses.

12 January 2017

Dan Bricklin changed the world forever when he codeveloped VisiCalc, the first electronic spreadsheet and grandfather of programs you probably use every day like Microsoft Excel and Google Sheets.

Join the software engineer and computing legend as he explores the tangled web of first jobs, daydreams and homework problems that led to his transformational invention.