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 no data survey eort breeding season probability of presence <br />1. The probability of presence for each week is calculated as the number of survey events in <br />the week where the species was detected divided by the total number of survey events <br />for that week. For example, if in week 12 there were 20 survey events and the Spotted <br />Towhee was found in 5 of them, the probability of presence of the Spotted Towhee in <br />week 12 is 0.25. <br />2. To properly present the pattern of presence across the year, the relative probability of <br />presence is calculated. This is the probability of presence divided by the maximum <br />probability of presence across all weeks. For example, imagine the probability of presence <br />in week 20 for the Spotted Towhee is 0.05, and that the probability of presence at week <br />12 (0.25) is the maximum of any week of the year. The relative probability of presence on <br />week 12 is 0.25/0.25 = 1; at week 20 it is 0.05/0.25 = 0.2. <br />3. The relative probability of presence calculated in the previous step undergoes a statistical <br />conversion so that all possible values fall between 0 and 10, inclusive. This is the <br />probability of presence score. <br />To see a bar's probability of presence score, simply hover your mouse cursor over the bar. <br />Breeding Season () <br />Yellow bars denote a very liberal estimate of the time-frame inside which the bird breeds <br />across its entire range. If there are no yellow bars shown for a bird, it does not breed in your <br />project area. <br />Survey Eort () <br />Vertical black lines superimposed on probability of presence bars indicate the number of <br />surveys performed for that species in the 10km grid cell(s) your project area overlaps. The <br />number of surveys is expressed as a range, for example, 33 to 64 surveys. <br />To see a bar's survey eort range, simply hover your mouse cursor over the bar. <br />No Data () <br />A week is marked as having no data if there were no survey events for that week. <br />Survey Timeframe <br />Surveys from only the last 10 years are used in order to ensure delivery of currently relevant <br />information. The exception to this is areas o the Atlantic coast, where bird returns are <br />based on all years of available data, since data in these areas is currently much more sparse. <br />SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />Bald Eagle <br />Non-BCC <br />Vulnerable <br />Golden Eagle <br />Non-BCC <br />Vulnerable