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 September 2018

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 4.3% for the year ending September 2018, compared with 4.6% for the year ended September 2017.

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 $2,421 million and $2,675 million.

Country

Total Spend ($m)

Year ended September 2017

Year ended September 2018

Lower bound ($m)

Upper bound ($m)

All

11,063

4.6%

4.3%

10,583

11,542

Australia

2,548

4.3%

5.0%

2,421

2,675

China

1,630

14.1%

11.1%

1,450

1,811

Germany

572

10.2%

8.6%

523

622

Japan

263

19.4%

19.8%

211

315

UK

954

8.9%

6.9%

889

1,020

USA

1,230

8.2%

11.6%

1,087

1,373

Sample size for the year to September 2018

The total sample size for the year ended September 2018 was 9.062, up from 8,928 in the year ended September 2017. This is above the target sample size of 8,900 respondents each year.  

Country

Year ended September 2017

Year ended September 2018

All

8,928

9,062

Australia

3,006

2,465

UK

987

1,023

USA

930

626

China

549

916

Germany

499

535

Japan

458

563

 

Response rate for the year to September 2018

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 September 2018 and September 2017. Falling response rates are not necessarily indicative of falling survey coverage, as the achieved sample size may compensate for this.

Country

Year ended September 2017

Year ended September 2018

All

30%

27%

Australia

34%

28%

China

18%

21%

Germany

24%

26%

Japan

32%

30%

UK

29%

31%

USA

31%

29%