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  1. hcup-us.ahrq.gov/figures/5_03.jsp
    Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Year Number of Regular Hospitals Total Number of Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913 (no value) …
  2. hcup-us.ahrq.gov/figures/5_05.jsp
    January 01, 2005 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Year Regular Sample of Hospitals Total Sample of Hospitals 2005 1,054 (no value) 2004 1,004 (no value) 2003 994 (no value) 2002 995 (no value) 2001 986 (no …
  3. hcup-us.ahrq.gov/figures/5_02.jsp
    Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Year Number of Hospitals Total Number of Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913 (no value) 1994…
  4. hcup-us.ahrq.gov/figures/5_01.jsp
    Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Year Number of Hospitals Total Number of Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913 (no value) 1994…
  5. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2008.jsp
    January 01, 2008 - However, these NIS samples were not designed to yield a representative sample of hospitals at the State … The two samples could be combined to form a single, generalizable 20% subsample of discharges. … an equal probability of selection for the sample, regardless of whether they appeared in prior NIS samples … This deviates from the procedure used for earlier samples, which maximized the longitudinal component … For a description of zero-weight hospitals in the 1988-1992 samples, refer to the special report: Design
  6. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2007.jsp
    January 01, 2007 - However, these NIS samples were not designed to yield a representative sample of hospitals at the State … The two samples could be combined to form a single, generalizable 20% subsample of discharges. … an equal probability of selection for the sample, regardless of whether they appeared in prior NIS samples … This deviates from the procedure used for earlier samples, which maximized the longitudinal component … For a description of zero-weight hospitals in the 1988-1992 samples, refer to the special report: Design
  7. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2021.jsp
    January 01, 2021 - Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples … Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples
  8. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2020.jsp
    January 01, 2020 - Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples … Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples
  9. hcup-us.ahrq.gov/db/nation/nis/tools/stats/FileSpecifications_NIS_2002_10PCT_SAMPLE_B.TXT
    January 01, 2002 - Data Set Name: NIS_2002_10PCT_SAMPLE_B Number of Observations: 785398 Total Record Length: 490 Total Number of Variables: 116 Columns Description: ======= ============ 1- 3 Database name 5- 8 Discharge year of data 10- 25 File name 27- 29 Variable number 31- 49 Variable name 51- 53 …
  10. hcup-us.ahrq.gov/db/nation/nis/tools/stats/FileSpecifications_NIS_2003_10PCT_SAMPLE_B.TXT
    January 01, 2003 - Data Set Name: NIS_2003_10PCT_SAMPLE_B Number of Observations: 797773 Total Record Length: 505 Total Number of Variables: 126 Columns Description: ======= ============ 1- 3 Database name 5- 8 Discharge year of data 10- 25 File name 27- 29 Variable number 31- 59 Variable name 61- 63 …
  11. hcup-us.ahrq.gov/db/nation/nis/tools/stats/FileSpecifications_NIS_2004_10PCT_SAMPLE_B.TXT
    January 01, 2004 - Data Set Name: NIS_2004_10PCT_SAMPLE_B Number of Observations: 800457 Total Record Length: 506 Total Number of Variables: 126 Columns Description: ======= ============ 1- 3 Database name 5- 8 Discharge year of data 10- 25 File name 27- 29 Variable number 31- 59 Variable name 61- 63 …
  12. hcup-us.ahrq.gov/db/nation/nis/tools/stats/NIS_2004_SummaryStats_10PCT_SAMPLE_B.PDF
    January 01, 2004 - please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, HCUP Summary Statistics Report: NIS 2004 - 10PCT_SAMPLE_B File 1 Means o…
  13. hcup-us.ahrq.gov/db/nation/nis/tools/stats/NIS_2002_SummaryStats_10PCT_SAMPLE_B.PDF
    January 01, 2002 - please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, HCUP Summary Statistics Report: NIS 2002 - 10PCT_SAMPLE_B File 1 Means o…
  14. hcup-us.ahrq.gov/db/nation/nis/tools/stats/NIS_2003_SummaryStats_10PCT_SAMPLE_B.PDF
    January 01, 2003 - please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, HCUP Summary Statistics Report: NIS 2003 - 10PCT_SAMPLE_B File 1 Means o…
  15. hcup-us.ahrq.gov/db/nation/nis/tools/stats/NIS_2000_SummaryStats_10PCT_SAMPLE_B.PDF
    January 01, 2000 - please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, HCUP Summary Statistics Report: NIS 2000 - 10PCT_SAMPLE_B File 1 Means o…
  16. hcup-us.ahrq.gov/db/nation/nis/tools/stats/NIS_2001_SummaryStats_10PCT_SAMPLE_B.PDF
    January 01, 2001 - please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, please refer to the section on Description of Data Elements. For more information about the coding of HCUP data elements, HCUP Summary Statistics Report: NIS 2001 - 10PCT_SAMPLE_B File 1 Means o…
  17. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2010.jsp
    January 01, 2010 - However, these NIS samples were not designed to yield a representative sample of hospitals at the State … The two samples could be combined to form a single, generalizable 20% subsample of discharges. … an equal probability of selection for the sample, regardless of whether they appeared in prior NIS samples … This deviates from the procedure used for earlier samples, which maximized the longitudinal component … For a description of zero-weight hospitals in the 1988-1992 samples, refer to the special report: Design
  18. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2011.jsp
    January 01, 2011 - However, these NIS samples were not designed to yield a representative sample of hospitals at the State … The two samples could be combined to form a single, generalizable 20% subsample of discharges. … an equal probability of selection for the sample, regardless of whether they appeared in prior NIS samples … This deviates from the procedure used for earlier samples, which maximized the longitudinal component … For a description of zero-weight hospitals in the 1988-1992 samples, refer to the special report: Design
  19. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2013.jsp
    January 01, 2013 - Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples … Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples … of discharges from a sample of approximately 1,000 hospitals, whereas the proposed systematic design samples … Patient factors DRG Admission month The superior performance of the systematic design that samples … 0.58 0.57 0.55 Hospital Mortality 0.57 0.55 0.55 0.51 Based on 500 Simulated Samples
  20. hcup-us.ahrq.gov/reports/methods/2003_02.jsp
    January 01, 2003 - superpopulation (stochastic) model, procedures have been developed to draw inferences using weights from complex samples … The SURVEYSELECT procedure provides a variety of methods for selecting probability-based random samples … The procedure can select a simple random sample, or samples with design features such as stratification

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