Measuring Spatial Accessibility of Health Care Providers - Introduction of a Variable Distance Decay Function within the Floating Catchment Area (FCA) Method.
Measuring Spatial Accessibility of Health Care Providers - Introduction of a Variable Distance Decay Function within the Floating Catchment Area (FCA) Method.
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DOI：
10.1371/journal.pone.0159148
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Groneberg DA
中科院分区：
文献类型：
--
作者：
Bauer J;Groneberg DA
我们集成了最近的改进浮动集水区（FCA）的方法家庭到一个综合的“iFCA”的方法。在该方法中，我们重点讨论了距离衰减函数及其参数。到目前为止，只有距离衰减函数与常数参数已被应用。因此，我们开发了一个可变距离衰减函数，用于FCA方法。我们能够在基于逻辑的距离衰减函数中用现成的分布参数（即中位数和标准差（SD））替换阻抗系数β。因此，该函数是由全球服务范围内所有人口到供应商距离的中位数和标准差为每个人口位置单独塑造的。可变距离衰减函数的理论应用在概念上显示出合理的结果。此外，有效的可变集水面积定义的距离衰减函数的渐近趋近于零的存在性被揭示，满足可变集水面积的需要。在柏林（德国）的城市案例研究中应用的iFCA方法证实了所建议的方法的理论拟合。总之，我们首次在综合FCA方法中引入了可变距离衰减函数。该函数说明了由供应商分布决定的个人旅行行为。此外，该函数继承了有效的可变汇流大小，因此无需单独确定可变汇流大小。
We integrated recent improvements within the floating catchment area (FCA) method family into an integrated ‘iFCA`method. Within this method we focused on the distance decay function and its parameter. So far only distance decay functions with constant parameters have been applied. Therefore, we developed a variable distance decay function to be used within the FCA method. We were able to replace the impedance coefficient β by readily available distribution parameter (i.e. median and standard deviation (SD)) within a logistic based distance decay function. Hence, the function is shaped individually for every single population location by the median and SD of all population-to-provider distances within a global catchment size. Theoretical application of the variable distance decay function showed conceptually sound results. Furthermore, the existence of effective variable catchment sizes defined by the asymptotic approach to zero of the distance decay function was revealed, satisfying the need for variable catchment sizes. The application of the iFCA method within an urban case study in Berlin (Germany) confirmed the theoretical fit of the suggested method. In summary, we introduced for the first time, a variable distance decay function within an integrated FCA method. This function accounts for individual travel behaviors determined by the distribution of providers. Additionally, the function inherits effective variable catchment sizes and therefore obviates the need for determining variable catchment sizes separately.