fp days

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Excel errors and how to stop them

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FPDAYS 2012

Creator of Tsunami

(F# IDE)

Big Data / Machine Learning

Applied Researcher

Business Intelligence

Process Engineering

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Skype moloneymb

Email moloneymb@gmail.com

Twitter @moloneymb

Website http://tsunami.io

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FP Users?

Excel Users?

Customers with Excel?

Windows Users?

Academics?

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Managers / Customers like Excel

Functional Programmers like Functional

Programming

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Visit to Silicon Valley

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VITAMINS PAINKILLERS

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Social @tsunamiide tsunami.io Earthquake Enterprises

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> 1% of formulae

cells contain errors

88% of Excel

spreadsheets contain

errors

Large spreadsheets

have > 12 errors

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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

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“Just because we’re stupid doesn’t

mean everybody else was.”

– Jamie Diamond

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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

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http://www.eusprig.org/horror-stories.htm

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EXCEL

400 Million entrenched

users

Substantial Existing

Investment

FP

Productivity

Type Safety

Testability

Auditability

Performance

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Social @tsunamiide tsunami.io Earthquake Enterprises

http://tsunami.io http://www.statfactory.co.uk

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