From f1a188d6896d997fba72f52441b21e0280eee7f8 Mon Sep 17 00:00:00 2001
From: Galen Guyer <galen@galenguyer.com>
Date: Mon, 16 Nov 2020 19:29:43 -0500
Subject: add positive test rate

---
 src/MainPage.js | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/MainPage.js b/src/MainPage.js
index f00db6a..354263a 100644
--- a/src/MainPage.js
+++ b/src/MainPage.js
@@ -6,6 +6,16 @@ const MainPage = (props) => {
     const data = props.data;
     const latest = data[data.length - 1];
     const prior = data[data.length - (1 + props.timeDifference)];
+    const priorPrior = data[data.length - (1 + props.timeDifference * 2)];
+
+    const positiveTestRate = (
+        ((latest.total_students - prior.total_students) * 100) /
+        (latest.tests_administered - prior.tests_administered)
+    ).toFixed(1);
+    const priorPositiveTestRate = (
+        ((prior.total_students - priorPrior.total_students) * 100) /
+        (prior.tests_administered - priorPrior.tests_administered)
+    ).toFixed(1);
 
     return (
         <>
@@ -96,14 +106,20 @@ const MainPage = (props) => {
             </div>
             <br />
             <div id="tests">
-                <h4 className="text-2xl">Number of Tests Administered by Student Health Center</h4>
+                <h4 className="text-2xl">Tests</h4>
                 <div className="Section">
                     <Card
-                        name="Tests to date"
+                        name="Tests Administered"
                         latest={latest.tests_administered}
                         diff={latest.tests_administered - prior.tests_administered}
                         link="/tests"
                     />
+                    <Card
+                        name="Positive Test Rate"
+                        latest={positiveTestRate + "%"}
+                        diff={priorPositiveTestRate + "%"}
+                        link="/"
+                    />
                 </div>
             </div>
             <br />
-- 
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