Supplement 1. Excel-sheet calculator and calculator instructions.

File List Supp1ExcelGuide.pdf Supp2ExcelCalculator.xls ExcelCalculatorAbundanceData.pdf ExcelCalculatorIncidenceData.pdf Description Supp1ExcelGuide.pdf contains a complete description of the variables and how to use the Excel Spreadsheet calculator. Supp2ExcelCalculator.xls is an Excel spreadsheet with formulas to calculate the statistics described in the paper.