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@@ -106,45 +106,38 @@ <h4>Calculations</h4> |
106 | 106 | </div> |
107 | 107 |
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108 | 108 |
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109 | | - <h2>Pre-Post Effect of PAYT Within a 5-year Time Period</h2> |
| 109 | + <h2>Pre-Post Effect of PAYT Within a 5-year Time Period</h2> |
| 110 | + |
110 | 111 | <strong>Step 1:</strong> Merge data sources to obtain key information |
111 | | - <ul> |
112 | | - <li>Data sources include the Massachusetts Department of Environmental Protection's Municipal Solid Waste and Recycling surveys from 2009 to 2024, inclusive; the Massachusetts Department of Revenue's Divison of Local Services; and the Massachusetts Department of Environmental Protection's spreadsheet, "Massachusetts Municipalities with PAYT Programs, June 2025".</li> |
113 | | - <li>Key information: PAYT adoption year, years pre- and post-PAYT adoption, number of households enrolled in each municipality's trash system, annual tonnage disposed per household.</li> |
114 | | - </ul> |
115 | | - </li> |
116 | | - <li> |
117 | | - <strong>Step 2:</strong> Generate annual tons of waste disposed per household |
118 | | - <ul> |
119 | | - <li>Tons per household are calculated by dividing the municipality's total annual disposal tonnage by the number of households served by the PAYT program.</li> |
120 | | - <li>Tons per household standardizes our metric, as larger municipalities will dispose of more total trash than smaller municipalities.</li> |
121 | | - </ul> |
122 | | - </li> |
123 | | - <li> |
124 | | - <strong>Step 3:</strong> Remove records that would distort the "normal trash" comparison |
125 | | - <ul> |
126 | | - <li>Keep only rows of data in which bulky waste is excluded.</li> |
127 | | - <li>Exclude years that did not record yearly tonnage.</li> |
128 | | - </ul> |
129 | | - </li> |
130 | | - <li> |
131 | | - <strong>Step 4:</strong> Identify the longest pre- and post-period for parallel trends |
132 | | - <ul> |
133 | | - <li>Filter data to contain municipalities with data 5 years before implementing PAYT through 5 years after implementing PAYT.</li> |
134 | | - <li>If one town has 20 years of data and another has 3 years, comparisons may not follow parallel trends; therefore, we may not conclude that adopting PAYT had a statistically significant result.</li> |
135 | | - </ul> |
136 | | - </li> |
137 | | - <li> |
138 | | - <strong>Step 5:</strong> Select Harvard, Chicopee, Heath, Hinsdale, and Peru |
139 | | - </li> |
140 | | - <li> |
141 | | - <strong>Step 6:</strong> Create a time series chart |
142 | | - <ul> |
143 | | - <li><strong>IMPORTANT NOTE:</strong> Our time of adoption begins at -1 (the adoption year); Year 0 is the implementation year; Year 1 is one year after implementation.</li> |
144 | | - </ul> |
145 | | - </li> |
146 | | - </div> |
147 | | - </div> |
| 112 | + <ul> |
| 113 | + <li>Data sources include the Massachusetts Department of Environmental Protection's Municipal Solid Waste and Recycling surveys from 2009 to 2024, inclusive; the Massachusetts Department of Revenue's Division of Local Services; and the Massachusetts Department of Environmental Protection's spreadsheet, "Massachusetts Municipalities with PAYT Programs, June 2025".</li> |
| 114 | + <li>Key information: PAYT adoption year, years pre- and post-PAYT adoption, number of households enrolled in each municipality's trash system, annual tonnage disposed per household.</li> |
| 115 | + </ul> |
| 116 | + |
| 117 | + <strong>Step 2:</strong> Generate annual tons of waste disposed per household |
| 118 | + <ul> |
| 119 | + <li>Tons per household are calculated by dividing the municipality's total annual disposal tonnage by the number of households served by the PAYT program.</li> |
| 120 | + <li>Tons per household standardizes our metric, as larger municipalities will dispose of more total trash than smaller municipalities.</li> |
| 121 | + </ul> |
| 122 | + |
| 123 | + <strong>Step 3:</strong> Remove records that would distort the "normal trash" comparison |
| 124 | + <ul> |
| 125 | + <li>Keep only rows of data in which bulky waste is excluded.</li> |
| 126 | + <li>Exclude years that did not record yearly tonnage.</li> |
| 127 | + </ul> |
| 128 | + |
| 129 | + <strong>Step 4:</strong> Identify the longest pre- and post-period for parallel trends |
| 130 | + <ul> |
| 131 | + <li>Filter data to contain municipalities with data 5 years before implementing PAYT through 5 years after implementing PAYT.</li> |
| 132 | + <li>If one town has 20 years of data and another has 3 years, comparisons may not follow parallel trends; therefore, we may not conclude that adopting PAYT had a statistically significant result.</li> |
| 133 | + </ul> |
| 134 | + |
| 135 | + <strong>Step 5:</strong> Select Harvard, Chicopee, Heath, Hinsdale, and Peru |
| 136 | + |
| 137 | + <strong>Step 6:</strong> Create a time series chart |
| 138 | + <ul> |
| 139 | + <li><strong>IMPORTANT NOTE:</strong> Our time of adoption begins at -1 (the adoption year); Year 0 is the implementation year; Year 1 is one year after implementation.</li> |
| 140 | + </ul> |
148 | 141 |
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149 | 142 | <script> |
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