12 This is relevant if the study involves a cohort of multiply homeless families in addition to first-time homeless.
13 This can be investigated only if the study is national with sufficient local samples or a set of local studies.
14 This is relevant only if the study includes a comparable sample of poor families who are at risk of homelessness.
15 In some communities, the sample would be selected from a central screening center rather than from individual shelters.
16 The sample, depending on interest, could be expanded to include all families requesting shelter, not just first-timers.
17 If the study is designed to use HMIS data, then it may make sense to use local Continuum of Care (CoC) as the primary sampling unit. CoC's could further be clustered by geography, location (e.g., rural/urban), and whether they have an operating HMIS system in order to select a final sample.
18 From Federal Register, July 30, 2004, Homeless Management Information Systems (HMIS): Data and Technical Standards of Final Notice, Docket No. FR 4848-N-02.