Audit sampling method

Definition: Implement audit procedures for projects with audit relevance below 100% in the population.

Characteristics of audit sampling

1 ... all traditional units have the opportunity to be selected.

2. According to the test results of the sample items, we can infer the conclusion about the sample population.

Available range

1 Risk assessment procedures usually do not involve auditing.

2. Control test: applicable (when the controlled operation leaves the track), not applicable (without the control of the running track).

sampling risk

1, control the sampling risk in the test.

2. Sampling risks in substantive procedures

Non-sampling risk: Non-sampling risk is caused by human factors and difficult to quantify. Relevant measures can be taken to reduce the non-sampling risk to an acceptable level.

statistical sampling

1 features: randomly select sample items and evaluate the sample results by using probability theory.

2. Advantages: It is helpful for certified public accountants to design samples, objectively measure the sampling risk, and accurately control the risk by adjusting the sample size.

3. Disadvantages: It requires special professional skills and a single sample project to meet the statistical requirements, resulting in additional expenses.

Non-statistical sampling: the sampling risk cannot be accurately determined, but if properly designed, it can provide the same effect as the statistical sampling method.

Attribute sampling and variable sampling: both belong to statistical sampling methods. Attribute sampling is aimed at the occurrence rate, and variable sampling is aimed at the total amount.

Determine the sampling methods: simple random sampling, systematic sampling and random sampling.

Factors affecting sample size

1. Acceptable risk of overdependence

2. Allowable deviation rate

3. Estimate the overall deviation

4. Overall scale

5. Other factors

Statistical sampling method

1 Statistical formula to evaluate sample results: upper limit of overall deviation rate = equal to sorting system/sample size.

2. Use the sample result evaluation table to evaluate the sample result.

Non-statistical sampling method: the sampling risk cannot be measured directly, and the estimated overall deviation rate is usually compared with the allowable deviation rate.

Determine the sampling method

1, currency unit sampling

2. Traditional variable sampling: mean method, difference method and ratio method.

Factors affecting sample size

1 ... acceptable error risk

2. Tolerable false positives

3. Expected overall misstatement

4. Overall scale

5. Variability of population