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81. HCUP Methods Series Calculating Nationwide Inpatient Sample (NIS) Variances for Data Years 2011 and Earlier
    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

82. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2013
    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

83. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2021
    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

84. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2020
    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

85. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2019
    hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2019.jsp
    January 01, 2019 - 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

86. Calculating Variances Using the 1999 Nationwide Inpatient Sample (pdf file)
    hcup-us.ahrq.gov/reports/methods/2003_02.pdf
    January 01, 2003 -  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

87. Calculating Variances Using the 1999 Nationwide Inpatient Sample (pdf file)
    hcup-us.ahrq.gov/reports/methods/2005-07.pdf
    January 01, 2005 - • 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

88. Calculating Variances Using the 1999 Nationwide Inpatient Sample (pdf file)
    hcup-us.ahrq.gov/db/nation/kid/reports/CalculatingKIDVariances.pdf
    December 16, 2005 - • 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

89. HCUP Sample Design: National Databases - Accessible Version
    hcup-us.ahrq.gov/tech_assist/sampledesign/508_compliance/index508_2018.jsp
    January 01, 2018 - Remember that these national databases are based on samples - they must be weighted to derive national

90. HCUP Nationwide Inpatient Sample Design Report 1992-1988
    hcup-us.ahrq.gov/db/nation/nis/reports/NIS_1992_1988_Design_Report.jsp
    January 01, 1992 - The two samples can be combined to form a single, generalizable 20 percent subsample of discharges. … Potthoff, Woodbury, and Manton 2 ) have been developed to draw inferences using weights from complex samples

91. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2012
    hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2012.jsp
    January 01, 2012 - 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

92. HCUP_methods_series_cover.ai (pdf file)
    hcup-us.ahrq.gov/reports/methods/TrendReport2005_1.pdf
    March 19, 2004 - For this analysis we drew 500 samples using the old sample design, with and without the preference for … A comparison of the distribution of estimates across the 500 samples showed that removing the longitudinal … Adjustments to the Stratification Variables In redesigning the sample, we did not simulate NIS samples … of mental health and substance abuse (MHSA) between 1988 and 1997 using one of the NIS 10-percent samples … While we encourage the use of the 10-percent samples for preliminary analyses, we recommend that final

93. Figure 5: Number of Hospitals Sampled, by Year
    hcup-us.ahrq.gov/figures/nis_figure5_2010.jsp
    January 01, 2010 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Years Regular Sample Hospitals Total Sample Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913   1994 …

94. Figure 5: Number of Hospitals Sampled, by Year
    hcup-us.ahrq.gov/figures/nis_figure5_2013.jsp
    January 01, 2013 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Years Regular Sample Hospitals Total Sample Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913   1994 …

95. Figure 5: Number of Hospitals Sampled, by Year
    hcup-us.ahrq.gov/figures/nis_figure5_2012.jsp
    January 01, 2012 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Years Regular Sample Hospitals Total Sample Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913   1994 …

96. Figure 5: Number of Hospitals Sampled, by Year
    hcup-us.ahrq.gov/figures/nis_figure5_2011.jsp
    January 01, 2011 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Years Regular Sample Hospitals Total Sample Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913   1994 …

97. Figure 5: Number of Hospitals Sampled, by Year
    hcup-us.ahrq.gov/figures/nis_figure5_2009.jsp
    January 01, 2009 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Years Regular Sample Hospitals Total Sample Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913   1994 …

98. Figure 5: Number of Hospitals Sampled, by Year
    hcup-us.ahrq.gov/figures/nis_figure5_2008.jsp
    January 01, 2008 - Figure 5: Number of Hospitals Sampled, by Year Figure 5: Number of Hospitals Sampled, by Year Years Regular Sample Hospitals Total Sample Hospitals 1988 758 759 1989 875 882 1990 861 871 1991 847 859 1992 838 856 1993 913   1994 …

99. Figure 5: Number of Hospitals Sampled, by Year
    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…

100. Figure 5: Number of Hospitals Sampled, by Year
     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…