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Federal Register / Vol. 86, No. 143 / Thursday, July 29, 2021 / Notices
Fig. 1: Eligible Blocks and Populated Areas
Fig. 2: Eligible Populated Areas and Coverage
Fig. 3: Covered Populated Areas with Grid
Fig 4: Grid Cells Eligible for Selection
For commitments that do not promise different speeds for different middlemile technologies, the frame would utilize the most recent Form 477
submissions from the provider, which currently is the providers deployment data as of December 2020. For areas served by more than one technology, the area would only be included in the frame for the latest generation technology. For example, if an area is covered by both 2G and 3G, then the area would only be included in the 3G
frame. As no commitments were made for 5G service, any 5G coverage will be included within the LTE frame. Where a provider has committed to different speeds in different areas due to different middle-mile technologies, the frame would rely on additional data submitted by the provider to differentiate the covered areas of a given technology e.g., LTE with multiple middle-mile types.
If a provider wishes to submit data that better reflects the December 2021
Form 477 data that it is likely to submit in March 2022 than the December 2020
data that the Commission currently has,
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then it should notify the Bureau within the Public Notice comment cycle and submit the updated coverage data within 10 days of the adoption of the Order. The Bureau will create a stratified random sample for the provider to test within 15 days of receipt of updated data, or, in the event of no new data submitted, 10 days of the adoption of an Order.
C. Frame Stratification Frame stratification is the process of dividing a frame into subsets of similar characteristics, called strata. This methodology allows fewer grid cells to be selected for testing while producing the same level of accuracy as sampling the entire frame, thus reducing testing burden.
The number of strata for each frame depends on the number of grid cells in a given frame. To create the strata, the Bureau proposes to use the cumulative square root of the frequency CSRF
method, based on grid-level estimates of covered population. CSRF is a standard stratification method used to define the breaks between strata. It creates equal
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intervals not on the scale along the stratification variable in this case, covered population scale, but rather on the scale along the cumulated square root of the count frequency of grid cells belonging to equal intervals of the stratification variable.
Based on the data staff currently has, it is expected that each frame will contain between two and eight strata.
Staff analysis has found that this stratification method produces strata of more equal sizes than other potential stratification methods e.g., based on census tracts, which reduces the number of grid cells that need to be selected for testing.
Further, staff proposes to select certain grid cells with probability 1 grid cells that are called certainties within each stratum. This ensures that grid cells that have a high population within a given stratum are tested; this should prevent the testing results of the stratum from being skewed by outlier results from low-weighted grid cells.

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