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United States User's Guide to the Department of Agriculture An Forest Service Event Monitor: Intermountain Research Station Ogden, UT 84401 Addition to the General Technical Report INT-196 Prognosis Model December 1985 -31^ u4s r" Nicholas L. Crookston -.->cr: la<y^ -p3 co. CO IF MAI PAI LT Then harvest, prepare site, and plant Douglas-fir.
THE AUTHOR RESEARCH SUMMARY NICHOLAS L. CROOKSTON is an Operations Research The Event Monitor is a programmed procedure for Analyst at the Intermountain Research Station, dynamically invoking management activities to be Forestry Sciences Laboratory, in Moscow, ID. During simulated by the Prognosis Model. Activities include the time this work was completed, Mr. Crookston was simulated thinnings, harvesting, plantings, or any a research associate. College of Forestry, Wildlife and other activity that the simulation model can mimic.
User's Guide to the Event Monitor: An Addition to the Prognosis IVIodel Nicholas L. Crookston INTRODUCTION The decision to perform a management activity in a stand is often contingent upon several factors. Thinning may be caEed for if the stand is too dense, or spraying may be required if an insect population is causing too much damage.
Lines 6 and 7: The logical expression is coded "free form" (that is, characters need not be placed in specific columns) on one or more supplemental data records that follow the IF keyword. The ampersand ("&") at the end of line 6 signals that the expression is continued on the following record.
Generating Decision Decision trees are used to evaluate several different management responses Trees to one event. For a description of this and other applications of decision trees see Stage (1975), Talerico and others (1978), Crookston (1978), Stage and others (in press), and the Parallel Processing Extension user's guide (PPE) (Crookston in preparation). Because the creation of decision trees (fig. 1) in the PPE is controlled by the Event Monitor, an example has been included to illus- trate how to use the PPE and the Event Monitor together.