These rating numbers have become a trading game. The problem is they are simply not reliable indicators of crop yields and were really never intended to be used as such.Several states released their monthly winter wheat crop ratings last Monday. The first of the weekly national crop progress reports won't start until the first Monday in April. WPI has always expressed caution on how these weekly crop ratings should be viewed. Like so many other reports in the marketplace, these seem to have taken on a life of their own. Analysts are now trying to use the weekly ratings changes to forecast final crop yields from week to week, and the market of course anxiously awaits the numbers every Monday afternoon. These rating numbers have become a trad...