Carto markup for TileMill map of kids in Early Intervention programs in Rhode Island. See map here: http://dataforradicals.com/tilemill-and-mapbox-are-pretty-fun/

gistfile1.txt

Map {
  background-color: #b8dee6;
}

#countries {
  ::outline {
    line-color: #1889a2 ;
    line-width: 2;
    line-join: round;
  }
  polygon-fill: #fff;
}


// I had to get a states 'shapefile' to upload as a layer to make this part work. 
// I used this one, which was pretty crude.  You can probably find a better shapefile of US states. 
// http://www.arcgis.com/home/item.html?id=f7f805eb65eb4ab787a0a3e1116ca7e5

#states
 ::outline {
    line-color: #1889a2;
    line-width: .5;
  	line-join: round;
  }

// One of the layers I uploaded was a spreadsheet of cities in RI along with the number of 
// kids involved in early childhood "Early Intervention" programs.  
// The column containing the # of kids was titled "KIDS_EI". 

#kidsinearlyintervent {

// With Carto I was able to change the size of the marker based on how many kids in a city were enrolled in EI. 
// More information on that here: http://mapbox.com/tilemill/docs/crashcourse/styling/
  
     [KIDS_EI >= 200] { marker-width:25; }
  [KIDS_EI <= 150] { marker-width:20; }
  [KIDS_EI <= 100] { marker-width: 15; }
  [KIDS_EI <= 50] { marker-width: 10; }
  [KIDS_EI <= 25] { marker-width: 5;}
  
    marker-fill: #1889a2;
  marker-line-color:#813;
  marker-allow-overlap:true
  
}