<snapdata remixID="10128502"><project name="U5L2P3-Disease Spread  " app="Snap! 6, https://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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image="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAABAUlEQVQ4T5WSO07DUBBFzzx/EqGYQAkFJWsA07AE1gESbAWQYBthCTR8tgAlBZTgOIKE2G+Q/RQcx3ziV87cc0dv5gqLbyU9JLPHqNkqW2Kf8M0579HlvFRqXJC84pm1hpkzeOOjvz7rVWCQWjzqRosOijKJTOlT9rrpM7Dx46Rm8YVxtOnAzlCRv4d986owWRXBT0/xOVlympNlnAlh8oAx261Aax+FcDjAyEE7UK8ENKY7umkFjnt7biPLnGLmnKNMI+PAIi25Xvy72WKjnhwVKapu4Cd3eLLzK1xAud6T9XerAFRHiglH1xiC2p8tUz57+yC3zcg1tqOxK1XieckXvJFLRgiVQEUAAAAASUVORK5CYII=" id="11"/></item></list></costumes><sounds><list struct="atomic" id="12"></list></sounds><blocks></blocks><variables></variables><scripts><script x="30" y="30"><block s="receiveGo"></block><custom-block s="initialize"></custom-block><block s="show"></block><block s="doRepeat"><block var="population size"/><script><block s="createClone"><l><option>myself</option></l></block></script></block><block s="hide"></block><custom-block s="activateTimer"></custom-block></script><script x="221" y="13"><block s="receiveOnClone"></block><custom-block s="cloneInitialize"></custom-block><block s="doForever"><script><block s="doIf"><block s="reportGreaterThan"><block var="time elapsed"/><l>0</l></block><script><block s="bounceOffEdge"></block><block s="forward"><block var="speed"/></block><block s="doIf"><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block s="reportGet"><l><option>self</option></l></block></block><l>healthy</l></block><script><block s="doIf"><custom-block s="collideWithSick?"></custom-block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infected counter</l><l>1</l></block></script></block></script></block></script></block></script></block></script><comment x="54" y="348" w="355" collapsed="false">5.2.3.1 What really matters is the population density but as the area where the population lives in the simulation is fixed, we can safely focus on the effects of population size.  A sensible hypothesis would be as population size (density) increases, the rate at which the disease spreads also increase (duration of outbreak decreases).</comment><comment x="54" y="453.9999999999999" w="332" collapsed="false">5.2.3.4 Some of the simplifying assumptions: &#xD;1) assume population is restricted to a fixed area, in reality population always in flux moving in/out of a locality.  (think international travelers for example)&#xD;2. assume there is no healing or immunity after infection&#xD;3. assume agents continue interacting after infection, in reality the sick will either die or be restricted in movement due to laying in hospital bed etc.).&#xD;</comment><comment x="544" y="127.99999999999999" w="90" collapsed="false">See the hints page linked on the project page for some explanation of these blocks</comment><comment x="58" y="604" w="328" collapsed="false">5.2.3.5 One possible hypothesis:  As POPULATION SIZE increases, the duration of outbreak (TIME ELAPSED) will decrease because the rate of infection increases.  &#xD;&#xD;5.2.3.6 A graph like an exponential decay is expected.</comment></scripts></sprite><watcher var="speed" style="normal" x="10" y="10" color="243,118,29" hidden="true"/><watcher scope="Stage" s="getTimer" style="normal" x="113" y="5.000005999999985" color="4,148,220" hidden="true"/><watcher var="time elapsed" style="normal" x="13.888888888888914" y="9.777783777777763" color="243,118,29"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="label %&apos;text&apos; of size %&apos;size&apos;" type="command" category="pen"><comment x="0" y="0" w="90" collapsed="false">LABEL will stamp text on the stage at the given font size. 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Enter 1-200.</l></block><block s="doSetVar"><l>population size</l><block s="getLastAnswer"></block></block><block s="doAsk"><l>What percentage of the population is infected initially? Enter 1-100.</l></block><block s="doSetVar"><l>percent initially sick</l><block s="getLastAnswer"></block></block><block s="doAsk"><l>What is the speed of the people? Enter 1-10.</l></block><block s="doSetVar"><l>speed</l><block s="getLastAnswer"></block></block></script></block-definition><block-definition s="cloneInitialize" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSwitchToCostume"><l>healthy</l></block><block s="doIf"><block s="reportLessThan"><block var="infected counter"/><block s="reportProduct"><block var="population size"/><block s="reportQuotient"><block var="percent initially sick"/><l>100</l></block></block></block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infected counter</l><l>1</l></block></script></block><block s="setHeading"><block s="reportRandom"><l>1</l><l>360</l></block></block><block s="gotoXY"><block s="reportRandom"><l>-240</l><l>240</l></block><block s="reportRandom"><l>-180</l><l>180</l></block></block></script></block-definition><block-definition s="collideWithSick?" type="predicate" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><custom-block s="for each %upvar of %l %cs"><l>item</l><block s="reportGet"><l><option>neighbors</option></l></block><script><block s="doIf"><block s="reportAnd"><block s="reportTouchingObject"><block var="item"/></block><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block var="item"/></block><l>sick</l></block></block><script><block s="doReport"><block s="reportBoolean"><l><bool>true</bool></l></block></block></script></block></script></custom-block><block s="doReport"><block s="reportBoolean"><l><bool>false</bool></l></block></block></script></block-definition></blocks><variables><variable name="speed"><l>5</l></variable><variable name="population size"><l>50</l></variable><variable name="percent initially sick"><l>50</l></variable><variable name="time elapsed"><l>4</l></variable><variable name="infected counter"><l>50</l></variable></variables></project><media name="U5L2P3-Disease Spread  " app="Snap! 6, https://snap.berkeley.edu" version="1"></media></snapdata>