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Correlation of Test Positivity and Case Rate with Tier Assignments in California Counties as of 10-5-20

Source: California Department of Public Health (CSV). This dataset includes information on COVID-19 tier assignments for each county in California, along with test positivity rates, case rates, and other equity measures used in tier assessment. It provides insight into the state's assessment process for restriction levels in response to COVID-19 spread. Dates: 2020-08-31 to 2020-10-05
  • Counties under more restrictive tiers (red and purple) tend to have higher test positivity and adjusted case rates, signifying a correlation between the tier level and severity of COVID-19 spread.
  • Several counties with test positivity rates higher than 5% were assigned to the more restrictive red and purple tiers, aligning with increased rates of infection.
  • Some counties exhibit low test positivity and case rates whilst remaining in more restrictive tiers, indicating possible delays or other factors in tier reassessment.
  • A few counties with test positivity rates of 0% and similarly low adjusted case rates are observed mainly in less restrictive orange and minimal tier (yellow), reflecting better control of COVID-19 spread.
  • The color-coding representation in the scatter plot clearly indicates clusters of different tiers, suggesting that the tier system roughly corresponds to the measured epidemiological indicators.

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