Yet subsequent sizable revisions often show how unreliable are preliminary economic data.

The latest revision, in 1990, shows 10 zones, each representing an area of winter hardiness.

The revision showed the economy growing at a 1.1 percent, up from an initial estimate of half of 1 percent.

But a revision showed his campaign instead owed $685,000 in election expenses.

But subsequent revisions of the national income accounts showed that the decline they cited had not actually occurred.

For the Patriots, their winning script showed few revisions from last season.

Finally, the fourth revision showed during her encore concerts in Taipei.

Moreover, the upward revision showed less production going into inventories and more of it to meet demand.

An upward revision in the December number showed growth in that area continuing.

The revision shows increased risks in all five reasons for concern.