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==Calculation==
The SET50 Index and the SET100 Index were created "to accommodate the issuing of index futures and options in the future, and to provide a benchmark of investment in the [[Stock Exchange of Thailand]] [SET]".<ref>{{Cite web|last=The Stock Exchange of Thailand |first= |title=Products & Services - SET Index Series
|work= |publisher= |date= |url=http://www.set.or.th/en/products/index/setindex_p3.html |archive-url=https://www.webcitation.org/68HjXtrCQ?url=http://www.set.or.th/en/products/index/setindex_p3.html |archive-date=2012-06-09 |url-status=live }}</ref> Both indices are calculated from the stock prices of companies that are included in the [[SET Index]], but each index consists of a subset of those stocks by a ranking based on large market capitalization, high liquidity and compliance with requirements regarding the distribution of shares to minor shareholders: those stocks ranked as the top 50 such stocks are the component stocks of the SET50 Index and those ranked as the top 100 — which also includes the top 50 — are the component stocks of the SET100 Index.
The calculation method used for these two indices is the same as that used for the [[SET Index]], which is a market capitalization weighted index. The base dates used are 16 August 16, 1995 (SET50 Index) and 30 April 2005 (SET100 Index), which are the respective dates that the two indices were first published and were set to a base value of 1000 points. The base market value is continually adjusted to correspond to changes in the market values of the underlying securities of each index.
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