Update blog post barryclark#5

_drafts/06-top-ten-national-parks.md

@@ -1,7 +1,7 @@
 ---
 layout: post
-title:  The "top ten" national parks.
-date: 10-6-2019
+title:  Park popularity
+date: 10-7-2019
 tags: national-park-service
 ---
 Let's take a look at the top ten parks in terms of visits. The parks are in order of total visits in 2018 are listed in the table below.

_posts/2019-06-26-have-park-visits-been-going-up.md

@@ -20,14 +20,14 @@ The plot below shows total park visits for the national parks since 1904. A few
 
 The next two plots compare the total national park visits per year to the U.S. population.
 In the first plot, the data are separated, and we can see the steady increase in the U.S. population up to the current level of ~327 million people (2018) and the less steady, but still increasing total number of national park visits up to the 2018 level of ~86 million.
-The second plot displays the per capita national park visits per year. Per capita means "for each head" in Latin, and park visits per capita is calculated as number of park visits per year divided by U.S. population for that year. This gives us an idea of the growing or decreasing popularity of the national parks. Interestingly, visits per capita increases rapidly between 1904 and 1967 (except for during WWII) when there is a decrease. It then bounces between .21 and .27 from 1970 to 2018 with a mean value of .25. Perhaps this means that instead of increasing, we have reached peak visits per capita and park visits will hover around 25% of the U.S. population with annual variablity due to economic conditions. If true, this would certainly help the NPS plan for visit numbers each year.
+The second plot displays the per capita national park visits per year. Per capita means "for each head" in Latin, and park visits per capita is calculated as number of park visits per year divided by U.S. population for that year. This gives us an idea of the growing or decreasing popularity of the national parks. Interestingly, visits per capita increases rapidly between 1904 and 1967 (except for during WWII) when there is a decrease. It then bounces between .21 and .27 from 1970 to 2018 with a mean value of .25. A regression line fit to the data since 1967 shows a slight downtrend in visits per capita for the national parks. Perhaps this means that instead of increasing, we have reached peak visits per capita and park visits will hover around 25% of the U.S. population with annual variablity due to economic conditions. If true, this would certainly help the NPS plan for visit numbers each year.
 
 ![Line plot image]({{ site.baseurl }}/assets/05_census_park_visits_vs_us_pop_national_parks.png)
 
-![Line plot image]({{ site.baseurl }}/assets/05_census_park_visits_per_capita_national_parks.png)
+![Line plot image]({{ site.baseurl }}/assets/05_census_park_visits_per_capita_vs_year_national_parks.png)
 
 ### Data Sources
-The list of 419 official park units (as of 5/1/2019) broken out by designation comes from the [National Park System](https://www.nps.gov/aboutus/national-park-system.htm){:target="_blank"} page at nps.gov. Park visit data from the report, "Annual Summary Report (1904 - Last Calendar Year)" found on the [NPS Stats](https://irma.nps.gov/Stats/reports/national){:target="_blank"} website. 2010-2018 U.S. population data from the [U.S. Census Bureau American Fact Finder](https://factfinder.census.gov/faces/nav/jsf/pages/searchresults.xhtml?refresh=t). 1900-2009 U.S. population data from State Intercensal Tables found on [www.census.gov](www.census.gov).
+The list of 419 official park units (as of 5/1/2019) broken out by designation comes from the [National Park System](https://www.nps.gov/aboutus/national-park-system.htm){:target="_blank"} page at nps.gov. Park visit data from the report, "Annual Summary Report (1904 - Last Calendar Year)" found on the [NPS Stats](https://irma.nps.gov/Stats/reports/national){:target="_blank"} website. 2010-2018 U.S. population data from the [U.S. Census Bureau American Fact Finder](https://factfinder.census.gov/faces/nav/jsf/pages/searchresults.xhtml?refresh=t){:target="_blank"}. 1900-2009 U.S. population data from State Intercensal Tables found on [www.census.gov](www.census.gov){:target="_blank"}.
 
 ### Using the Scripts
 Instructions to run the scripts are found in the readme in the GitHub repository found [here](https://github.com/goodmorningdata/nps){:target="_blank"}.