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Notes Sheet
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General:
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Enter values in the "Parameters" and "Values Assignment" tabs. After filling in all your input values, view the "Results" tab.
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Resizing the formula bar in Google Sheets may make it easier to read the contents of explanatory cells
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Notes on cells are visible outside of GiveWell, to those who have "view only" access. Comments on cells are visible only to those who have comment or edit access.
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Color code on "Parameters" and "Values" tabs:
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Orange indicates parameters that are both uncertain and likely to have major affects on results
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Pink marks parameters that are more certain or less influential
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Color code on intervention tabs:
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Blue marks calculations
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Orange marks values pulled from "Parameters" or "Value Assignments" tabs
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White marks defult values
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Pink marks items changed from their default values
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Notes on DSW Model: Major differences from previous CEAs (GiveWell 2016 CEA and DSW 2017 draft CEA)
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Types of benefits not included
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This CEA does not include disability weight averted from cases of diarrhea averted. This is similar to GiveWell's approach to valuating the benefits of malaria cases averted.
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This CEA does not include any value of the program potentially averting deaths of persons over 5. We are highly uncertain about the program's effect on over-5 mortality. In contrast, GiveWell's CEA of AMF includes an estimate of over-5 deaths averted.
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This CEA does not include any value of the program potentially causing developmental benefits in children, due to decreased childhood illness, and potentially leading to better adult outcomes (such as higher incomes). GiveWell's CEAs of deworming and malaria control include such benefits. We are not aware of any literature examining the potential of reduced childhood diarrheal illness to lead to long-term increases in income.
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Under-5 deaths averted
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Previous CEAs have counted all diarrhea deaths averted as under-5 deaths averted. This is consistent with our current approach in AMF's CEA.
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This CEA author's preference is for the CEA to recognize that some children whose diarrheal death is averted will go on to die of other causes (all cause mortality minus diarrheal mortality) before reaching 5 years of age; for the CEA to only count children who survive to 5 but would otherwise have died before 5 as under-5 deaths averted. Internal GiveWell discussion concluded that, in the interest of maintaining consistency across CEAs, this CEA should count a "diarheal death averted" as one instance of possible death averted, with the child not necessarily surviving to 5 years of age. This history is why there exist in this CEA parameters for all-cause mortality and proportion of all-cause mortality that is diarrheal, and why these are set to values such that they do not impact the CEA.
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Time-discounted deaths
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This CEA compares annual benefits to annual costs: we model the program as maintaining already-installed dispensers for a year, and model the expected number of deaths-due-to-diarrhea that will be averted in a single year. Because we use this approach, we do not time-discount deaths.
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Todos
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This CEA does not include the up-front installation costs of dispensers. Not including these costs is somewhat favorable to the program. In an update to this CEA, we would include these costs.
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Helpful GiveWell references:
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Top Charities
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Other cost-effectiveness analyses (including past years' versions)
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Discussion of cost-effectiveness as a criteria
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Blog posts discussing cost-effectiveness
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Cost-Effectiveness Analysis FAQ
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Cost-Effectiveness Analysis Video Walkthrough — Make sure to watch the video in HD in full screen to see details
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