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DATA ANALYSIS <br />A data base management and analysis system wars developed on a CYBER 17? • <br />orngruter to analyze vegetation data collected during this study.. Data <br />were input via keypunched cards that had been double punched and verified <br />for accuracy. Raw data print-outs were form3l:ted like the original field <br />data sheets to facilitate additional data verification. <br />The procedures and formulae used to analyze vF~etation production, Dover <br />and frequency data are straightforward, well docwspnted in the scientific <br />literature, and summarized in Wyani.txJ DEQ Guideline #2, 1979 edition. <br />Data analysis results are presented by species and life form for each <br />sasrpling point (e.g., cover quadrat) and ssmm~rized for all sample <br />points within a particular vegetation type. Statistical methods used <br />in the analysis such as calculation of means anal standazd deviations are <br />also standard, well dociarented techniques (Srn=_decor and Cochran, 1967) . <br />Analysis results are formatted in tabular form t4 facilitate access and <br />interpretation. <br />The Shannon~•leiner index is used to aomsouiicate: and conspare species • <br />diversity for the revegetation plot and mixed trrush type/aspen subtype <br />and upland sagebrush adjacent native undisturbEd sites. This index is <br />based on the Shannon-Weiner function from the field of information theory <br />(Mazgalef, 1957; MacArthur and t~JacArthur, 1961; Lloyd and Ghelazdi, <br />1964; Pielou, 1966). As a diversity index for oomnunity analysis, the: <br />function describes the average degree of uncertainty of predicting the <br />species of a given individual picked at random from the oommuiity. Ttsis <br />uncertainty and the index increase both as the number of species increases <br />and as the individuals are distributed srnre and -rore equitably atsong <br />species already present. The general formula for this index is as follows: <br />K = - E Pi loge pi <br />where pi =decimal fraction of total individuals belonging to the ith <br />species (in this case, percent basal Dover is used to express pi). Szsssple • <br />calculations using the above formula are presented in the Vegetation <br />-8- <br />