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Variable Measurement
Scale The proportion of
Independent Commissioners
The size of the Audit Committee
Independence of the Board of Commissioners is measured by
the ratio or percentage between the numbers of the
Independent Commissioner members as compared to the
total number of members of the Board of Commissioners.
Audit committee size is calculated by counting the
number of members of the Audit Committee in the annual
reports of the companies Ratio
Ratio
Source: Processed from secondary data
3.2. Sampling Method
Sampling method is kind of method that taken data from population. A sample is a subset of the population. A sample consists of the member of
population. The sample in this research includes companies listed at the Indonesian Stock Exchange within 2009 - 2014. The reason for choosing the
period 2009 until 2014, it’s due to some companies listed in Indonesia Stock
Exchange has just begun to disclose the sustainability report with good corporate governance disclosure start in 2005.
This research use purposive sampling, which means determine in advance the number of samples to be taken, then the sample selection is done based on
certain objectives. Start from 2005, it was a primary for some companies to disclose their sustainability reporting as a voluntary and follow in according to
GRI guideline. This research will conduct a purposive sampling. Regarding to the
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population in this research must meet the following criteria: 1.
The Issuer has published sustainability reports within 2009 until 2014 2.
The Issuer applies GRI cross index as the guidance for the sustainability report 3.
The Issuer has published and disclosed the good corporate governance information.
4. The Issuer has published the respective sustainability reports on the
company’s website
6.3. Data Collection Method
This research is using data from secondary sources, which was published by the companies such as reports on the company’s website, annual reports of
company or media reports. The data used in this research is secondary data. Secondary data is data that available from previous research, case studies, and
library records, online data, company websites, and the internet in general Sekaran and Bougie, 2010.
The data collection method in this research is a panel data. Panel data analysis is a method of studying a particular subject within multiple sites,
periodically observed over a defined time frame. It means the combination of time series with cross-sections can enhance the quality and quantity of data
. The data in this research is obtained from respective companies website
and Indonesia Stock Exchange IDX. The Annual Report data from the sampled Companies has been collected from the respective websites, and the sustainability
reports are taken from respective companies website and as appropriate with population criteria. The good corporate governance reports have been taken from
