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  1. hcup-us.ahrq.gov/figures/8_05.jsp
    Figure 8 : Number of Hospitals in 2005 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8 : Number of Hospitals in 2005 Universe, Frame, Sample, Target, and Surplus, by Region … Hospital Region Hospitals in Universe Hospitals in Frame Hospitals in Target Hospitals in Sample
  2. hcup-us.ahrq.gov/figures/8_02.jsp
    Figure 8 : Number of Hospitals in 2003 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8 : Number of Hospitals in 2002 Universe, Frame, Target, Sample, and Surplus, by Region … Hospital Region Hospitals in Universe Hospitals in Frame Hospitals in Target Hospitals in Sample
  3. hcup-us.ahrq.gov/figures/nis_figure8_2012.jsp
    January 01, 2012 - Figure 8: Number of Hospitals in the 2010 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8: Number of Hospitals in the 2010 Universe, Frame, Sample, Target, and Surplus, by … Region Region Hospitals in Frame Hospitals in Sample Hospitals in Target Hospitals in
  4. hcup-us.ahrq.gov/figures/nis_figure8_2011.jsp
    January 01, 2011 - Figure 8: Number of Hospitals in the 2009 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8: Number of Hospitals in the 2009 Universe, Frame, Sample, Target, and Surplus, by … Region Region Hospitals in Universe Hospitals in Frame Hospitals in Sample Hospitals in
  5. hcup-us.ahrq.gov/figures/nis_figure8_2010.jsp
    January 01, 2010 - Figure 8: Number of Hospitals in the 2008 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8: Number of Hospitals in the 2008 Universe, Frame, Sample, Target, and Surplus, by … Region Region Hospitals in Universe Hospitals in Frame Hospitals in Sample Hospitals in
  6. hcup-us.ahrq.gov/figures/nis_figure8_2013.jsp
    January 01, 2013 - Figure 8: Number of Hospitals in the 2011 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8: Number of Hospitals in the 2011 Universe, Frame, Sample, Target, and Surplus, by … Region Region Hospitals in Frame Hospitals in Sample Hospitals in Target Hospitals in
  7. hcup-us.ahrq.gov/figures/nis_figure8_2009.jsp
    January 01, 2009 - Figure 8: Number of Hospitals in the 2007 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8: Number of Hospitals in the 2007 Universe, Frame, Sample, Target, and Surplus, by … Region Region Hospitals in Universe Hospitals in Frame Hospitals in Sample Hospitals in
  8. hcup-us.ahrq.gov/figures/8_03.jsp
    Figure 8 : Number of Hospitals in 2003 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8 : Number of Hospitals in 2003 Universe, Frame, Sample, Target, and Surplus, by Region … Hospital Region Hospitals in Universe Hospitals in Frame Hospitals in Target Hospitals in Sample
  9. hcup-us.ahrq.gov/figures/8_04.jsp
    Figure 8 : Number of Hospitals in 2004 Universe, Frame, Sample, Target, and Surplus, by Region … Figure 8 : Number of Hospitals in 2004 Universe, Frame, Sample, Target, and Surplus, by Region … Hospital Region Hospitals in Universe Hospitals in Frame Hospitals in Target Hospitals in Sample
  10. hcup-us.ahrq.gov/db/nation/nis/NISIntroduction2019.pdf
    September 01, 2021 - HCUP National Inpatient Sample (NIS) ABSTRACT The National Inpatient Sample (NIS) is part of the … is now a sample of discharge records from all HCUP-participating hospitals, rather than a sample of … Rather than first drawing a sample of hospitals and then keeping all discharges from that sample, in … Rather than first drawing a sample of hospitals and then keeping all discharges from that sample, in … The new systematic sample is a self-weighted sample design similar to simple random sampling, but it
  11. hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2002_Design_Report.pdf
    January 01, 2002 - Final Hospital Sample The final 2002 sample included 7,853,982 discharges from 995 hospitals selected … Sample Weights It is necessary to incorporate sample weights to obtain nationwide estimates. … number for the total sample. … The total sample exceeded the target by 27 hospitals, with a resulting sample of 20.6% of the total … and Ns(sample) were the number of community hospitals within stratum s in the universe and sample,
  12. C (pdf file)

    hcup-us.ahrq.gov/reports/methods/2010_05.pdf
    January 01, 2010 - It is a census of discharges, not a sample of discharges. … This sample estimate is labeled a “point estimate.” … For a given sample, the sample mean is just one point estimate out of many point estimates that would … distribution of sample means that would occur if we calculated sample means from many different random … In particular, when the sample size n equals the population size N, the sample becomes a census and
  13. hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp
    May 01, 2025 - National (Nationwide) Inpatient Sample (NIS) Database Documentation The National (Nationwide) Inpatient … Sample (NIS) is the largest publicly available all-payer inpatient care database in the United States … Its large sample size is ideal for developing national and regional estimates and enables analyses of
  14. hcup-us.ahrq.gov/db/nation/kid/KIDIntroduction2022.pdf
    December 01, 2024 - KID Sample Design Design Considerations The overall design objective was to select a sample of pediatric … THE FINAL KID SAMPLE In Appendix I, we present tables and figures that summarize the final KID sample … hospitals, and sample discharges. … • “KID Sample Hospitals” lists the hospitals selected for the KID. … of sample other newborns in KID_STRATUM S_UNCB_U Number of sample normal newborns in KID_STRATUM
  15. hcup-us.ahrq.gov/db/nation/neds/nedsdbdocumentation.jsp
    May 01, 2025 - Nationwide Emergency Department Sample (NEDS) Database Documentation The Nationwide Emergency Department … Sample (NEDS) produces national estimates about emergency department (ED) visits across the country. … One of the most distinctive features of the NEDS is its large sample size, which allows for analysis
  16. hcup-us.ahrq.gov/db/nation/nis/nischecklist.jsp
    November 01, 2024 - QUERY TOOLS Checklist for Working with the NIS The National Inpatient Sample … For detailed information, review the HCUP Methods Report# 2014-04: Nationwide Inpatient Sample (NIS) … To learn more about the NIS sample design, view the Sample Design On-line Tutorial on the Tutorial … With great power comes great responsibility: big data research from the National Inpatient Sample. … Adherence to methodological standards in research using the National Inpatient Sample.
  17. hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2003_Design_Report_Edited_012506.pdf
    January 01, 2003 - Final Hospital Sample The final 2003 sample included 7,977,728 discharges from 994 hospitals selected … Sample Weights It is necessary to incorporate sample weights to obtain nationwide estimates. … number for the total sample. … The total sample exceeded the target by 27 hospitals, with a resulting sample of 20.6% of the total … and Ns(sample) were the number of community hospitals within stratum s in the universe and sample,
  18. hcup-us.ahrq.gov/databases.jsp
    January 01, 2025 - National (Nationwide) Inpatient Sample (NIS) NIS Database Documentation Kids’ Inpatient Database … (KID) KID Database Documentation Nationwide Ambulatory Surgery Sample (NASS) NASS Database … Documentation Nationwide Emergency Department Sample (NEDS) NEDS Database Documentation
  19. hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2005_Design_Report.pdf
    January 01, 2005 - Final Hospital Sample The final 2005 sample included 7,995,048 discharges from 1,054 hospitals selected … number for the total sample. … The total sample exceeded the target by 25 hospitals, with a resulting sample of 20.5% of the total … and Ns(sample) were the number of community hospitals within stratum s in the universe and sample, … The sampling design consisted of a stratified, single-stage cluster sample.
  20. hcup-us.ahrq.gov/tech_assist/standarderrors/508/508course_2016.jsp
    January 01, 2016 - deviation of the sample divided by the square root of the sample size. … To review the sample designs, refer to the HCUP Sample Design Tutorial . … sample, similar to the NEDS. … The Nationwide Emergency Department Sample The NEDS is a stratified two-stage cluster sample. … of the hospitals in the sample, and thus take all of the hospitals, or clusters, in the sample into

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