view the basic data from the latest walk, click
each walk (usually on Wednesdays, as of 2013, but not always), Alan files a "walk report" usually written
by John Beckett; listing all
the birds that were seen on the walk. He also includes the people that walked,
the temperature, and how the walk went that day. This section holds the most
with the walk reports every week, two plots of bird species observed versus
time are updated. One of these (birds_time) shows the number seen versus time
from 1987 to the present. The other (birds_epoch) shows the same data but
on a one-year timescale with all yearly time plots superimposed on each other.
section is filled with all the past walk reports. They are all kept to see trends
over the years in the birds sighted by the group. Occasionally you will find
reports written by other members of the group. These were times when
Alan was not on the walk.
This section is newly revised (1/2/08) and contains 20 plots (you just have to keep scrolling down to see them all). There are four
types of plots with 5 plots per type. Click the link to see them and their description.
This section is newly revised (10/24/08) and contains 4 plots. The first is a plot showing the number observed in 2008 by week number,
and the maximum, minimum, and median numbers observed by week number. The second plot shows the scores for the walks in 2008, which is the number of
standard deviations away from the average for all the walks held during that week from 1987 to present. The third plot shows the yearly ranking, which is the average over the year of the weekly walk scores. The fourth plot shows cumulative unique species observed by year.
Excel workbook contains the raw data collected on the walks organized by year