Canada mountains

The interactive tool helps the researchers determine what makers people happy.

Related: Woe Canada! Many U.S. retailers fail up north

"We ask people to rank the different dimensions of the index, which allows us to understand their priorities," said Boarini. The rankings published by the OECD assign equal weight to all 11 categories.

Canada, the sixth happiest country, is ranked above average in most criteria.

First published June 4, 2015: 10:09 AM ET

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