The research question for this review is:  How many “unique people” visit this site?

By unique, I mean unique names.  Individuals may return several days per week, and each day gets counted as an individual person, and each page they go to as a unique visit.  But at the end of the week, one person who visited several times per day, daily, will be counted as at least seven individuals.  So I worked on a way to evaluate the numbers of unique people who come to this page/site.  For this review, I focused on the main page.

To accomplish this, I reviewed the numbers of visits, developed an equation for calculating numbers of visitors for entire 5.5 years, based on the last three years, and came up with estimates/guesstimates on the numbers of unique visitors.

In general, the average number of pages visited per visitor is between 1.5 and 1.75.  The value 1.5 means that approximately 33% see just one page and 66% see two pages. (1:1 is 50% see one page, 50% see two pages.)



This first set of graphs depict values per period, illustrated as quarterly and yearly.  These are not cumulative data.  Over time, the numbers of followers continued to increase.  Again, this is the number who visited just my main blog page, no special pages on the topics I review.  Typically, a person first visits a special topics page, then looks for the main page to see who the author is.

For the first quarter in 2015, which I call “Spring”, I had 77,474 visits. (Jan-Feb-March is actually Winter, but I called the end of the year “Winter” for this review.)

A cumulative of this period is as follows:


This is a conservative estimate, based on the 1.5 value noted earlier.  It takes into account the influx of new members each month, and then estimate how many of them return over the remaining periods, per month and quarter.

The conservative estimate of number of people impacted by this site in just under 90,000 people.

It is estimated that about half of these visitors are doing work or research in medical GIS.  The other half are visiting for information about medical history and/or medical botany, and/or due to links from other places such as LinkedIn, ScoopIt!, Tumblr, and a few other sites that re-post much of my work.  (I recently learned get on the average 1300 to 1500 re-posts per new blog/home page posting, per special search engines, and about 15 reposts of my work by other ScoopIt! sites.).

The less conservative estimate for individual impacted, by my pages only (not the LinkedIn and others), increases this number to 100,000 or more.


So, I need to add–many  thanks to all you out there revisiting this site.

ESRI still has links to the historically important historical medical geography maps and articles I have posted, so I appreciate this support from ESRI as well.

I am in the process of translating the text (handwritten script, in Old German, using Old German medical and geographic terminology) and determining how to reproduce the famous disease map of Friedrich Schnurrer, ca. 1827 (figure below).  It is the first map of diseases, globally, based on his review of the literature for the time.  His work focuses on the famous epidemics and diseases documented by earlier writer.  Schnurrer was an expert in Chinese culture, and perhaps produced these maps due to the cholera impacts on China before it turned into a pandemic.