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  1. Kid 1997 Comparison (pdf file)

    hcup-us.ahrq.gov/db/nation/kid/reports/KID_1997_Comparison.pdf
    January 01, 1997 - Statistics calculated from the NHDS do have sampling error. … All NHDS statistics were calculated with Statistical Analysis System (SAS) microcomputer software. … Standard errors cannot be calculated directly from the NHDS data. … (Average stay was calculated from inpatient days and inpatient discharges). … The standard errors were calculated as follows.
  2. Summary (pdf file)

    hcup-us.ahrq.gov/reports/methods/KIDComp1997Final.pdf
    March 16, 2001 - Statistics calculated from the NHDS do have sampling error. … All NHDS statistics were calculated with Statistical Analysis System (SAS) microcomputer software. … Standard errors cannot be calculated directly from the NHDS data. … (Average stay was calculated from inpatient days and inpatient discharges). … The standard errors were calculated as follows.
  3. hcup-us.ahrq.gov/db/nation/nis/NISIntroduction2010.pdf
    November 01, 2015 - These alternate weights were calculated in the same way as the weights for the 1998 and later years … Standard errors and confidence intervals can then be calculated from the validation data. … Hospital Weights Hospital weights to the universe were calculated by post-stratification. … Within each stratum s, each NIS sample hospital's universe weight was calculated as: Ws(universe) … Discharge weights to the universe were calculated by post-stratification.
  4. hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2011.pdf
    January 01, 2011 - These alternate weights were calculated in the same way as the weights for the 1998 and later years … Standard errors and confidence intervals can then be calculated from the validation data. … Hospital Weights Hospital weights to the universe were calculated by post-stratification. … Within each stratum s, each NIS sample hospital's universe weight was calculated as: Ws(universe) … Discharge weights to the universe were calculated by post-stratification.
  5. hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2022_Core.TXT
    January 01, 2022 - NRD_2022_Core 10 DRG_NoPOA 3 Num DRG in use on discharge date, calculated … NRD_2022_Core 90 MDC_NoPOA 2 Num MDC in use on discharge date, calculated
  6. hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2021_Core.TXT
    January 01, 2021 - NRD_2021_Core 10 DRG_NoPOA 3 Num DRG in use on discharge date, calculated … NRD_2021_Core 90 MDC_NoPOA 2 Num MDC in use on discharge date, calculated
  7. hcup-us.ahrq.gov/db/nation/nrd/stats/FileSpecifications_NRD_2020_Core.TXT
    January 01, 2020 - NRD_2020_Core 10 DRG_NoPOA 3 Num DRG in use on discharge date, calculated … NRD_2020_Core 90 MDC_NoPOA 2 Num MDC in use on discharge date, calculated
  8. hcup-us.ahrq.gov/reports/methods/MS2021-02-HospDist-DataSuppl.xlsx
    December 06, 2021 - Methods for Calculating Patient Travel Distance to Hospital in HCUP Data – Data Supplements Supplement 1 Supplement 1. Distribution of difference (in miles) between geocode methods, by patient region, division, and urban/rural location, 2018 Location geocode comparison Census region Census division Urban/rural locat…
  9. hcup-us.ahrq.gov/db/nation/neds/NEDS2009Introductionv3.pdf
    September 01, 2011 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Sampling probabilities were calculated to select 20% of the universe contained in each stratum, which … Standard errors and confidence intervals then can be calculated from the validation data. … Accessed 09/10/2011. 3 NHIS estimates were calculated using the midpoint of the ranges provided in the
  10. hcup-us.ahrq.gov/db/nation/nis/2006NIS_INTRODUCTION.pdf
    November 01, 2015 - Standard errors and confidence intervals can then be calculated from the validation data. … Hospital Weights Hospital weights to the universe were calculated by post-stratification. … Within each stratum s, each NIS sample hospital's universe weight was calculated as: Ws(universe) … Discharge weights to the universe were calculated by post-stratification. … Within stratum s, for hospital i, each NIS sample discharge's universe weight was calculated as:
  11. hcup-us.ahrq.gov/db/vars/hosp_mhsmember/nisnote.jsp
    September 01, 2008 - It is calculated by assigning values of 1 or 0 (1 for being a member of a multi-hospital system and 0
  12. hcup-us.ahrq.gov/db/vars/hosp_mhsmember/kidnote.jsp
    September 01, 2008 - It is calculated by assigning values of 1 or 0 (1 for being a member of a multi-hospital system and 0
  13. hcup-us.ahrq.gov/db/nation/kid/KID_2009_Introduction.pdf
    January 01, 2009 - These alternative weights were calculated in the same way as the weights for the 2000 and later years … Standard errors and confidence intervals can then be calculated from the validation data. … Discharge weights to the universe were calculated by post-stratification. … Within stratum k, for hospital i, each KID sample discharge's universe weight was calculated as: … Population in 2009 KID States, by Region Calculated using the estimated U.S. population on July 1,
  14. hcup-us.ahrq.gov/db/nation/nis/APS-DRGs%20V22%20Weights%20Manual.pdf
    March 01, 2005 - Means are recalculated and weights are derived by dividing these means by averages calculated across … Finally, a series of summary statistics were calculated from the output files to assess data quality … Initial outlier trim points were calculated at 3.0 standard deviations from the overall arithmetic mean … The latter was calculated by dividing the total days, charges, or deaths in the input database by the … Normalized weights for the APS-DRGs® were standardized to ensure that the average weight calculated
  15. hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2008.jsp
    January 01, 2008 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Within stratum, s , for hospital, i, the universe weight for each visit in the NEDS sample was calculated … To ensure that weights are used appropriately and estimates and variances are calculated accurately, … Standard errors and confidence intervals then can be calculated from the validation data.
  16. hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2007v2.jsp
    November 01, 2015 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Within stratum, s , for hospital, i, the universe weight for each visit in the NEDS sample was calculated … To ensure that weights are used appropriately and estimates and variances are calculated accurately, … Standard errors and confidence intervals then can be calculated from the validation data.
  17. hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2006v2.jsp
    November 01, 2015 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Within stratum, s , for hospital, i, the universe weight for each visit in the NEDS sample was calculated … To ensure that weights are used appropriately and estimates and variances are calculated accurately, … Standard errors and confidence intervals then can be calculated from the validation data.
  18. hcup-us.ahrq.gov/db/nation/neds/NEDS_2006v2_IntroductionRevised.pdf
    November 01, 2015 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Within stratum, s, for hospital, i, the universe weight for each visit in the NEDS sample was calculated … To ensure that weights are used appropriately and estimates and variances are calculated accurately, … Standard errors and confidence intervals then can be calculated from the validation data.
  19. hcup-us.ahrq.gov/db/nation/neds/NEDS2007v2IntroductionRevised.pdf
    November 01, 2015 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Within stratum, s, for hospital, i, the universe weight for each visit in the NEDS sample was calculated … is a stratified probability sample of hospital-based EDs in the frame, with sampling probabilities calculated … To ensure that weights are used appropriately and estimates and variances are calculated accurately,
  20. hcup-us.ahrq.gov/db/nation/neds/NEDS_2007_Introduction_v5.pdf
    January 01, 2007 - Hospital Weights Hospital weights to the universe were calculated by poststratification. … Discharge Weights Discharge weights to the universe were calculated by poststratification. … Within stratum, s, for hospital, i, the universe weight for each visit in the NEDS sample was calculated … is a stratified probability sample of hospital-based EDs in the frame, with sampling probabilities calculated … • To ensure that weights are used appropriately and estimates and variances are calculated accurately

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