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Information on the relationship between scale and unit costs is critical to project the cost of global HIV prevention efforts and to allocate prevention resources efficiently.
We are aware of only one empirical study of the relationship between scale and unit costs of an HIV prevention program.
Rather than documenting the change in unit costs over time within expanding programs, we tabulated the unit costs of many programs simultaneously and measured the association between scale and unit costs among them.
The purpose of the current analysis was to document the relationship between scale and unit cost and not to formally assess the relative contribution of each of these three causes.
The relation between scale and unit costs was analysed using regression fits, separately for the larger PMTCT centres situated in tertiary hospitals attached to a medical college and those situated in hospitals not attached to a medical college, and also combined for these two types of PMTCT centres.
The relation between scale and unit economic cost was mostly inverse with a suggestion of an upward inflection at the highest end of the scale for PMTCT centres situated in hospitals attached to a medical college, with the best fit obtained using a quadratic function.
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Because of difference between scales of flow units produced by different petrophysical data grouping methods, variations are obtained between them, but as Fig. 18 shows accordance with defined flow units based on FZI method and cluster analysis is higher than Testerman method.
Optimal performance is achieved when the representative unit cell of the continuum model agrees with the actual size of the discrete truss unit cell, which accounts for size effects even in regimes where a separation of scales between finite element size and unit cell size does not strictly apply.
The ETDRS chart of distance is constituted by 14 lines with 5 letters each and can measure VA between 1.0 LogMAR units (that is equivalent to 0.1 in decimal scale) and −0.3 LogMAR units (2.0 in decimal scale).
are first scaled to zero mean and unit variance.
Filtered data were mean centered and scaled (unit variance or Pareto scaling).
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