Build flexible Excel functions that automatically handle blanks, defaults, and overrides without messy nested IFs.

Prevent broken formulas using tables, validation rules, separate worksheets, named variables, and the power of LAMBDA.

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Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Samantha (Sam) Silberstein, CFP®, CSLP®, EA, ...

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1 Department of Obstetrics and Gynaecology, The First Affiliated Hospital of Yangtze University, The First People’s Hospital of Jingzhou, Jingzhou, China. 2 School of Medicine, Yangtze University, ...