Analysis performed to determine the minimum sample size Prior to the commencement of the Round 16 collection, the minimum number of separations, number of hospitals and number of hospital groups required to participate was calculated based on data received from the Independent Hospital Pricing Authority (IHPA), the Department of Health, and Private Health Data Bureau dataset (PHDB). This Appendix describes the methodology and analysis performed to derive the minimum sample size requirements for the collection. Data analysis In determining the minimum participation level, the following datasets were received and reviewed: The published cost weight tables for 13; A summary of the NHCDC sample for Round 13 and Round 14, by hospital and DRG, for the overnight sector; From the Private Hospital Data Bureau dataset(PHDB): a summary of the population levels of activity, showing the total number of separations by hospital in-scope for the collection (at least 200 separations), for Round 13 and Round 14, for the overnight sector; From the PHDB dataset: a summary of the population levels of activity, average length of stay, and standard deviation of the length of stay, by hospital and DRG, for all private hospitals, i.e. for private overnight hospitals and private day hospitals. Item 1 above was obtained from the Department of Health and Ageing (DoHA) website. Items 2 and 3 above were provided by IHPA. Item 4 above was provided by DoHA. In order for the NHCDC sample to be representative of the patient population and the population of private hospitals, minimum participation levels have been specified in terms of: Separation sample size expressed as a percentage of the population levels of activity, where is defined as the total number of separations for hospitals in-scope “population” for the collection. The minimum separation sample size considered to provide sufficient reliability consistent with common statistical practice and historical publication practices was based on the following parameters: Standard deviation of per DRG; Margin of in the estimated average cost per DRG; and Statistical confidence that the estimates fall within the specified margin of error. Parameters (b) and (c) above were informed by reviewing the minimum sample size considered robust enough for publication in the Round 7 to 13 collections and parameter (a) was derived from the Round 13 cost weights. The minimum number of hospitals that are required to participate, in aggregate and by hospital characteristic, to ensure that the collection is representative of the population of private hospitals; and
Analysis performed to determine the minimum sample size Prior to the commencement of the Round 16 collection, the minimum number of separations, number of hospitals and number of hospital groups required to participate was calculated based on data received from the Independent Hospital Pricing Authority (IHPA), the Department of Health, and Private Health Data Bureau dataset (PHDB). This Appendix describes the methodology and analysis performed to derive the minimum sample size requirements for the collection. Data analysis In determining the minimum participation level, the following datasets were received and reviewed: The published cost weight tables for 13; A summary of the NHCDC sample for Round 13 and Round 14, by hospital and DRG, for the overnight sector; From the Private Hospital Data Bureau dataset(PHDB): a summary of the population levels of activity, showing the total number of separations by hospital in-scope for the collection (at least 200 separations), for Round 13 and Round 14, for the overnight sector; From the PHDB dataset: a summary of the population levels of activity, average length of stay, and standard deviation of the length of stay, by hospital and DRG, for all private hospitals, i.e. for private overnight hospitals and private day hospitals. Item 1 above was obtained from the Department of Health and Ageing (DoHA) website. Items 2 and 3 above were provided by IHPA. Item 4 above was provided by DoHA. In order for the NHCDC sample to be representative of the patient population and the population of private hospitals, minimum participation levels have been specified in terms of: Separation sample size expressed as a percentage of the population levels of activity, where “population” is defined as the total number of separations for hospitals in-scope for the collection. The minimum separation sample size considered to provide sufficient reliability consistent with common statistical practice and historical publication practices was based on the following parameters: Standard deviation of per DRG; Margin of in the estimated average cost per DRG; and Statistical confidence that the estimates fall within the specified margin of error. Parameters (b) and (c) above were informed by reviewing the minimum sample size considered robust enough for publication in the Round 7 to 13 collections and parameter (a) was derived from the Round 13 cost weights. The minimum number of hospitals that are required to participate, in aggregate and by hospital characteristic, to ensure that the collection is representative of the population of private hospitals; and