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the country, systems are improving, as communities overcome the technical difficulties implementing information systems and as additional programs without federal funding agree to submit data to local systems. An important reason for the improvement is that many communities use the data for local planning and performance measurement and not just responding to a federal requirement. As of 2017, an estimated 70% of people who used emergency shelters and transitional housing programs5 were included in HMIS reporting (Henry, Bishop, et al., 2018).

      In addition to the required reporting about people who use homeless assistance programs, HUD requires communities to do a point‐in‐time (PIT) count of all people experiencing homelessness, both sheltered and unsheltered, at least every other year, and many communities do one annually. The count happens on a specific night at the end of January, because in cold weather people experiencing homelessness are more likely to sleep indoors, where they are easier to count. But how to count people who are not sleeping in a shelter on that night but instead on the “street?” In most communities, teams of outreach workers and volunteers go to known locations, and ride around in cars in the middle of the night to try to spot and sometimes interview people who are out of doors. However, people experiencing homelessness often have good reasons to remain hidden, and counters are told not to put themselves at risk by searching for them, so such counts are inevitably incomplete.

      Together with colleagues, Beth tried to judge just how incomplete the street count was in New York City in 2005 (Hopper, Shinn, Laska, Meisner, & Wanderling, 2008). The City has one of the most sophisticated counts in the country. It divides the entire city into small packets of a few blocks, a transportation hub, or a subway station. It uses the best information available –from police, outreach workers, and previous counts—to estimate whether a homeless person will be found there. It then sends teams of volunteers on foot to all the packets where it expects to find people, and a random sample of the others, in the middle of the night with instructions to interview everyone found there and ascertain whether they are homeless. (People who are sleeping are counted without waking them.) The street count is then the actual number counted in places where people were expected plus a statistical extrapolation from places where they were not.

      Second, we visited soup kitchens, mobile food programs, drop‐in centers and the like over the next 2 days, and asked people where they had been on the night of the count. If they were homeless and not in shelter, we asked follow‐up questions to ascertain whether they could have been counted, if counters sent to their location had done exactly what they were instructed to do. For example, if people said they were on the subway, we asked whether they went to the end of the line, where counters moved onto cars to interview people who did not get off. Only 70% of people were in places where they could plausibly have been counted. Others—on a rooftop, in an abandoned building or a stairwell of an occupied one, in a parking structure, or on a porch behind shrubbery were not visible to teams walking the streets.

      To be included in the street count, a person had both to be in a visible place (as all the plants were) and to be counted. Thus the proportions from the two stages of our study multiply—suggesting that about half of the people who were sleeping rough that night were missed, although that estimate is not precise. Further, people were more likely to be found if they were in Manhattan, where most buildings are flush with sidewalks and most alleys are walled off, than in outer boroughs, where the varied streetscapes provide more hidden places. The rest of the country looks more like the outer boroughs than like Manhattan, suggesting that street counts elsewhere probably miss more. For example, in the huge geography that constitutes the Los Angeles metropolitan area, many people who sleep under freeways and in other dispersed locations probably are missed.

      Unsheltered people who are found during the PIT count are added to the numbers in shelters and transitional housing programs that night. New York's overall PIT count is also better than those of many other cities, because people have a legal right to shelter. So a much larger proportion of homeless people in New York stay in facilities where the count is essentially perfect. However, people who are not found, or who are unsheltered on a different night would not be included in the PIT count, although they may appear in annual numbers if they also use shelter during the course of the year.

      Despite their shortcomings, the most detailed national information on the characteristics of people who experience literal homelessness come from these two sources—the administrative data in Homeless Management Information Systems and the one‐night, PIT counts. The latter are less detailed, because it is hard to ask people a lot of questions about themselves when counting them in unsheltered locations in the middle of the night. What do these data sources tell us?

      The starting point for classifying people who experience homelessness is to distinguish adults and children who experience homelessness together (“families”) from people who experience homelessness without an accompanying child (“individuals”). This distinction is made by the U.S. Department of HUD in its annual reports to Congress, by the U.S. Interagency Council on Homelessness in federal strategic plans to end homelessness, and by community‐level planners who are responsible for allocating federal and local resources to address homelessness. The distinction between families and individuals is based loosely on the research literature that began to describe modern homelessness in the late 1980s, as well as the arrangements localities made for shelters, especially in the eastern part of the U.S. It has proved useful for policy and practice. Other groupings (veterans, youth, and people with chronic patterns of homelessness) overlap with both families and individuals.

      Families with Children

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