Chicago Fed: "Index suggests economic growth declined in May"

"Index suggests economic growth declined in May." This is the headline for this morning's release of the Chicago Fed's National Activity Index, and here is the opening paragraph from the report:

The Chicago Fed National Activity Index (CFNAI) fell to +0.01 in May from +0.40 in April. Two of the four broad categories of indicators used to construct the index made negative contributions in May, and two categories deteriorated from April. The index’s three-month moving average, CFNAI-MA3, decreased to +0.20 in May from +0.40 in April. [more]

Background on the CFNAI

The Chicago Fed's National Activity Index (CFNAI) is a monthly indicator designed to gauge overall economic activity and related inflationary pressure. It is a composite of 85 monthly indicators as explained in this background PDF file on the Chicago Fed's website. The index is constructed so a zero value for the index indicates that the national economy is expanding at its historical trend rate of growth. Negative values indicate below-average growth, and positive values indicate above-average growth.

The first chart below shows the recent behavior of the index since 2007. The red dots show the indicator itself, which is quite noisy, together with the 3-month moving average (CFNAI-MA3), which is more useful as an indicator of the actual trend for coincident economic activity.