In Portugal, the consumer confidence index on three terms moving averages is based on interviews with consumers about their perceptions of the country's current and future economic situation and their tendencies to purchase. It is estimated using the difference between the share of positive evaluation responses and negative evaluation responses, but do not include the share of neutral responses. The use of moving averages smooths out the series by removing the irregular movements, allowing the detection of the short-term trends.

Source: Statistics Portugal