Designing an Effective Sampling Plan An effective sampling plan begins with clearly defined objectives, such as estimating the misstatement in accounts receivable or assessing compliance with authorization controls. Foundations of Audit Sampling At its core, audit sampling involves the application of selection methods that give every item in a population a defined chance of inclusion.
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Each monetary unit in the population stands in as a sampling unit, so a $10,000 invoice has ten times the chance of selection as a $1,000 invoice. Block Selection Block selection involves choosing a contiguous sequence of items, such as all invoices from a particular week or all production orders from a specific machine during a shift.
Haphazard Selection Haphazard selection relies on the auditor’s judgment to pick items without a formal random method, provided the professional applies a disciplined, non-patterned approach. PPS sampling is popular for tests of details of balances because it naturally directs attention to high-value items that drive financial statement misstatements.
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While straightforward and easy to implement, block selection often delivers weaker statistical properties because items within a block may share similar characteristics. Units within the population should be mutually exclusive and collectively exhaustive to avoid gaps or double counting that would distort sample results.
More About Audit sampling methods
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More perspective on Audit sampling methods can make the topic easier to follow by connecting earlier points with a few simple takeaways.
