The Bloomberg Consumer Comfort Index is based on responses to telephone interviews with a random sample of 1,000 consumers aged 18 and older. Each week, 250 respondents are asked for their views on the economy, personal finances and buying climate; the percentage of negative responses is subtracted from the share of positive views and divided by three. The most recent reading is based on the average of responses over the previous four weeks.
The comfort index can range from 100, indicating every participant in the survey had a positive response to all three components, to minus 100, signaling all views were negative. The margin of error for the headline reading is 3 percentage points.
Field work for the index is done by SSRS/Social Science Research Solutions in Media, Pennsylvania.