Social @tsunamiide tsunami.io Earthquake Enterprises Excel errors and how to stop them
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Social @tsunamiide tsunami.io Earthquake Enterprises
Excel errors and how to stop them
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
FPDAYS 2012
Creator of Tsunami
(F# IDE)
Big Data / Machine Learning
Applied Researcher
Business Intelligence
Process Engineering
Social @tsunamiide tsunami.io Earthquake Enterprises
Skype moloneymb
Email [email protected]
Twitter @moloneymb
Website http://tsunami.io
Social @tsunamiide tsunami.io Earthquake Enterprises
FP Users?
Excel Users?
Customers with Excel?
Windows Users?
Academics?
Social @tsunamiide tsunami.io Earthquake Enterprises
Managers / Customers like Excel
Functional Programmers like Functional
Programming
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
Visit to Silicon Valley
Social @tsunamiide tsunami.io Earthquake Enterprises
VITAMINS PAINKILLERS
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
> 1% of formulae
cells contain errors
88% of Excel
spreadsheets contain
errors
Large spreadsheets
have > 12 errors
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
Risk Management was modelled in Excel
Run manually through copy / paste
One of the errors
Sum instead of Average -> halved reported
risk
Social @tsunamiide tsunami.io Earthquake Enterprises
“Just because we’re stupid doesn’t
mean everybody else was.”
– Jamie Diamond
Social @tsunamiide tsunami.io Earthquake Enterprises
Even renowned Harvard Economist make
mistakes
“Growth in a Time of Debt” Reinhart and Rogoff
Failed to manually select the correct columns
Substantial effect on the outcome of the study
Incorrect advice given to government policy
makers
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
http://www.eusprig.org/horror-stories.htm
Social @tsunamiide tsunami.io Earthquake Enterprises
EXCEL
400 Million entrenched
users
Substantial Existing
Investment
FP
Productivity
Type Safety
Testability
Auditability
Performance
Social @tsunamiide tsunami.io Earthquake Enterprises
Social @tsunamiide tsunami.io Earthquake Enterprises
http://tsunami.io http://www.statfactory.co.uk
Social @tsunamiide tsunami.io Earthquake Enterprises
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