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201. Figure 7: Number of NIS Discharges, Weighted, by Year
     hcup-us.ahrq.gov/figures/nis_figure7_2008.jsp
     January 01, 2008 - Figure 7: Number of NIS Discharges, Weighted, by Year Figure 7: Number of NIS Discharges, Weighted, by Year Years Number of Discharges in Millions, Weighted 1988 35,171,448 1989 35,104,645 1990 35,215,397 1991 35036492 1992 35,011,385 1993 34714530 …

202. Stataload Nis 2000 Hospital Trendwt
     hcup-us.ahrq.gov/db/nation/nis/weights/Stataload_NIS_2000_HOSPITAL_TrendWt.Do
     January 01, 2000 - HOSPID "HCUP hospital identification number" label var TRENDWT "Weight … to discharges in the universe" label var TRENDWTcharge "Weight to discharges in the universe

203. Filespecifications Nis 2000 Hospital Trendwt
     hcup-us.ahrq.gov/db/nation/nis/weights/FileSpecifications_NIS_2000_HOSPITAL_TrendWt.TXT
     January 01, 2000 - hospital identification number NIS 2000 HOSPITAL_TrendWt 3 TRENDWT 10 20 7 Num Weight … discharges in the universe NIS 2000 HOSPITAL_TrendWt 4 TRENDWTcharge 21 31 7 Num Weight

204. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2000_Design_Report.pdf
     January 01, 2000 - In the 2000 NIS files, the discharge weight data elements are named DISCWT and DISCWTCHARGE. … the 1993 NIS, the NIS samples no longer contain zero-weight hospitals. … Hospital-level weights were developed to weight NIS sample hospitals to the hospital universe. … Hospitals were stratified just as they were for universe hospital weight calculations. … In the 2000 NIS files, the discharge weight data elements are named DISCWT and DISCWTCHARGE.

205. Nis 2000 Hospital
     hcup-us.ahrq.gov/db/nation/nis/tools/stats/NIS_2000_HOSPITAL.TXT
     January 01, 2000 - hospital identifier with the leading 6 NIS 2000 HOSPITAL 2 DISCWT 8 17 4 Num Weight … estimates other than total charges NIS 2000 HOSPITAL 3 DISCWTcharge 18 27 4 Num Weight … Char Hospital state postal code NIS 2000 HOSPITAL 9 HOSPWT 115 124 4 Num Weight

206. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2001_Design_Report.pdf
     January 01, 2001 - .............................................................................................. iii Weight … Another strategy is to use sample weight adjustments to compensate for missing values. … Zero-Weight Hospitals Beginning with the 1993 NIS, the NIS samples no longer contain zero-weight hospitals … Hospitals were stratified just as they were for universe hospital weight calculations. … When using one of the 10% subsample files, use the subsample discharge weight (the discharge weight

207. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2002_Design_Report.pdf
     January 01, 2002 - Thus no adjustment is required for the hospital weight when using the subsamples. … Another strategy is to use sample weight adjustments to compensate for missing values. … Zero-Weight Hospitals Beginning with the 1993 NIS, the NIS samples no longer contain zero-weight hospitals … Hospitals were stratified just as they were for universe hospital weight calculations. … When using one of the 10% subsample files, use the subsample discharge weight (the discharge weight

208. NIS Database Documentation - Corrections 1993
     hcup-us.ahrq.gov/db/nation/nis/corrections_1993.jsp
     January 01, 1993 - Contents   Correction to 1993 Weights file MEDSTAT discovered the following errors in the weight … data, 208 of 408,318 hospital discharges were discarded from the sample but not discarded from the weight … Consequently, for two South Carolina hospitals the weight file incorrectly contains missing values for … We have an updated version of the weight file that corrects the above errors.

209. HCUP Nationwide Inpatient Sample Design Report 1999
     hcup-us.ahrq.gov/db/nation/nis/reports/NIS_1999_Design_Report.jsp
     January 01, 1999 - Ten Percent Subsamples Change to Hospital Sampling Procedure Beginning with the 1998 NIS Zero-Weight … Zero-Weight Hospitals Beginning with the 1993 NIS, the NIS samples no longer contain no zero-weight … Hospital-level weights were developed to weight NIS sample hospitals to the hospital universe. … The strata that were collapsed for sampling were also collapsed for sample weight calculations. … Hospitals were stratified just as they were for universe hospital weight calculations.

210. HCUP Nationwide Inpatient Sample Design Report 1998
     hcup-us.ahrq.gov/db/nation/nis/reports/NIS_1998_Design_Report.jsp
     January 01, 1998 - Zero-Weight Hospitals Beginning in 1993, the NIS samples contain no zero-weight hospitals. … Hospital-level weights were developed to weight NIS sample hospitals to the hospital universe. … The strata that were collapsed for sampling were also collapsed for sample weight calculations. … Within stratum s, each NIS sample hospital's universe weight was calculated as: W s (universe) = N … Hospitals were stratified just as they were for universe hospital weight calculations.

211. HCUP Nationwide Inpatient Sample Design Report 2000
     hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2000_Design_Report.jsp
     January 01, 2000 - In the 2000 NIS files, the discharge weight data elements are named DISCWT and DISCWTCHARGE. … Zero-Weight Hospitals Beginning with the 1993 NIS, the NIS samples no longer contain zero-weight hospitals … Hospital-level weights were developed to weight NIS sample hospitals to the hospital universe. … Hospitals were stratified just as they were for universe hospital weight calculations. … In the 2000 NIS files, the discharge weight data elements are named DISCWT and DISCWTCHARGE.

212. HCUP_methods_series_cover.ai (pdf file)
     hcup-us.ahrq.gov/reports/methods/TrendReport2005_1.pdf
     March 19, 2004 - Beginning with the 1993 NIS, we stopped including the zero-weight hospitals in the NIS. … We excluded all discharges from zero-weight hospitals for analyses in this report. … Hospital weights weight the sample of hospitals to the population of hospitals. … Discharge weights weight the sample of discharges to the population of discharges. … DISCWTcharge 2000 Discharge weight for national estimates of total charges.

213. Healthcare Cost and Utilization Project (HCUP) NIS Notes
     hcup-us.ahrq.gov/db/vars/apsdrg_los_weight/nisnote.jsp
     September 01, 2008 - of Data Elements   APSDRG_LOS_Weight - All-Payer Severity-adjusted DRG: Length of Stay Weight … Description Value Value Description APSDRG_LOS_Weight All-Payer Severity-adjusted DRG: Length of Stay Weight … nnn.nnnnn APSDRG Length of Stay Weight .

214. Healthcare Cost and Utilization Project (HCUP) NIS Notes
     hcup-us.ahrq.gov/db/vars/apsdrg_mortality_weight/nisnote.jsp
     September 01, 2008 - of Data Elements   APSDRG_Mortality_Weight - All-Payer Severity-adjusted DRG: Mortality Weight … Description Value Value Description APSDRG_Mortality_Weight All-Payer Severity-adjusted DRG: Mortality Weight … nnn.nnnnn APSDRG Mortality Weight .

215. Healthcare Cost and Utilization Project (HCUP) NIS Notes
     hcup-us.ahrq.gov/db/vars/apsdrg_charge_weight/nisnote.jsp
     September 01, 2008 - Description of Data Elements   APSDRG_Charge_Weight - All-Payer Severity-adjusted DRG: Charge Weight … Variable Description Value Value Description APSDRG_Charge_Weight All-Payer Severity-adjusted DRG: Charge Weight … nnn.nnnnn APSDRG Charge Weight .

216. Healthcare Cost and Utilization Project (HCUP) KID Notes
     hcup-us.ahrq.gov/db/vars/apsdrg_mortality_weight/kidnote.jsp
     September 01, 2008 - of Data Elements   APSDRG_Mortality_Weight - All-Payer Severity-adjusted DRG: Mortality Weight … Description Value Value Description APSDRG_Mortality_Weight All-Payer Severity-adjusted DRG: Mortality Weight … nnn.nnnnn APSDRG Mortality Weight .

217. Healthcare Cost and Utilization Project (HCUP) KID Notes
     hcup-us.ahrq.gov/db/vars/apsdrg_charge_weight/kidnote.jsp
     September 01, 2008 - Description of Data Elements   APSDRG_Charge_Weight - All-Payer Severity-adjusted DRG: Charge Weight … Variable Description Value Value Description APSDRG_Charge_Weight All-Payer Severity-adjusted DRG: Charge Weight … nnn.nnnnn APSDRG Charge Weight .

218. Healthcare Cost and Utilization Project (HCUP) KID Notes
     hcup-us.ahrq.gov/db/vars/apsdrg_los_weight/kidnote.jsp
     September 01, 2008 - of Data Elements   APSDRG_LOS_Weight - All-Payer Severity-adjusted DRG: Length of Stay Weight … Description Value Value Description APSDRG_LOS_Weight All-Payer Severity-adjusted DRG: Length of Stay Weight … nnn.nnnnn APSDRG Length of Stay Weight .

219. Kid 1997 Designreport (pdf file)
     hcup-us.ahrq.gov/db/nation/kid/reports/Kid_1997_designreport.pdf
     January 01, 1997 - With that minor adjustment, each discharge weight is essentially equal to the number of AHA universe … In some instances, strata were collapsed for sample weight calculations. … Within stratum k, for hospital I, each KID sample discharge's universe weight was calculated as: W … In this context,1 the survey weights are not used to weight the sampled cases to the universe, because … Computer Software for Variance Calculations The discharge weights should be used to weight the sample

220. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nis/Introduction_to_NIS_2002.pdf
     January 01, 2002 - DISCWTcharge 2000 Discharge weight for national estimates of total charges. … DISCWT10 1998-2002 Discharge weight on 10% subsample Core file for NIS beginning in 1998. … In all data years except 2000, this weight is used to create national estimates for all analyses. … PA APSDRG_LOS_ Weight 2002 All-Payer Severity-adjusted DRG: Length of Stay Weight PA APSDRG_Charge … discharge weight multiplied by 10).