Survey quality for the International Visitor Survey

This page explains what we do to attempt to reduce sampling error in the International Visitor Survey (IVS).

Quality assurance metrics

Below we provide the results against quality assurance metrics that are monitored to reduce sampling error in the International Visitor Survey (IVS). These include:

  • Relative Margin of Error (RME).
  • Sample size.
  • Response rate.

See Survey error for more information about types of errors and how they apply to the IVS.

Relative Margin of Error (RME) for the year to March 2019

The Relative Margin of Error (RME) represents the percentage above and below a figure for which we can be 95% confident that the true value is within.

The International Visitor Survey is designed to have an RME of:

  • 5% for total spend
  • 10% for the top 6 markets — Australia, China, USA, UK, Germany, and Japan.

The target was achieved this quarter, with the RME for total spend at 4.2% for the year ending March 2019, compared with 3.3% for the year ended March 2018.

Table of RMEs

The table below shows the RMEs for the total spend estimate, and for spending by our top 6 visitor markets, along with the upper and lower bounds.

As an example of how to interpret this table, there is 95% confidence that the true value of spending by Australian visitors lies somewhere between $2,513 million and $2,783 million.

Country

Total Spend ($m)

Year ended March 2018

Year ended March 2019

Lower bound ($m)

Upper bound ($m)

All

11,233

3.3%

4.2%

10,761

11,705

Australia

2,648

5.5%

5.1%

2,513

2,783

China

1,631

11.3%

14.5%

1,395

1,867

Germany

560

9.5%

13.5%

484

636

Japan

266

21.5%

11.8%

235

297

UK

1308

10.8%

8.2%

1201

1,415

USA

1,230

8.2%

11.6%

1,087

1,373

Sample size for the year to March 2019

The total sample size for the year ended March 2019 was 9,638, up from 8,789 in the year ended March 2018. This is above the target sample size of 8,900 respondents each year.  

Country

Year ended March 2018

Year ended March 2019

Target sample size

All

8,789

9,638

8,900

Australia

2,872

2,094

1,348

UK

1012

984

856

USA

696

1,046

920

China

662

1,077

1,040

Germany

481

614

752

Japan

397

879

752

Response rate for the year to March 2019

The response rate represents the percentage of people who complete the survey as a proportion of the total surveys emailed out. The International Visitor Survey was designed with an expected response rate of 30%.

This table presents the response rates by country for the years ended March 2019 and March 2018. Falling response rates are not necessarily indicative of falling survey coverage, as the achieved sample size may compensate for this.

Country

Year ended March 2018

Year ended March 2019

All

28%

28%

Australia

31%

28%

China

19%

22%

Germany

23%

28%

Japan

33%

39%

UK

28%

28%

USA

30%

28%