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The Total Case Doubling Time or TCDT for short, is the amount of time it takes for the number of coronavirus cases to double. The standard unit of time used is days, however, any unit of time may be used to replace it. The formula for calculating the TCDT is the number of total cases divided by the number of new cases.

If C refers to the number of total cases, and N refers to the number of new cases, then the formula in getting the TCDT is as follows.

$$C/N=TCDT $$

Usage
The TCDT is useful in calculating whether or not a certain country or area manages to flatten the curve. If an area has a relatively low TCDT, then it is experiencing an exponential growth in cases. If an area has a relatively high TCDT, then it is able to curb the number of infections and experiences logarithmic growth.

Total Case Tripling Time (TCTT)
The Total Case Tripling Time or TCTT, is the amount of time for the number of cases to triple. It can be calculated by simply multiplying the TCDT by 2. Other variations include the TCQT or the Total Case Quadrupling Time which calculates the time at which the number of current cases quadruples. This can be calculated similarly, by multiplying the TCDT by 3.

Usage In Recoveries, Deaths, & Tests
The TCDT formula can be applied to an area's number of recoveries, deaths, or tests. A low doubling time is ideal for both recoveries and tests as a higher number of each is beneficial in beating the coronavirus. For deaths, the rule is reversed. A high doubling time is ideal as not many people are dying from the virus.

Variations in Calculation
The TCDT formula may be slightly tweaked to account for the constant weekly inconsistencies in reported data. Some prefer to take the average number of new cases over 7 or 14 days to fix this problem. This creates different TCDT values in a given day, despite using the same formula. Whether one version of TCDT is more accurate than another is a subjective matter. In order to clarify different versions of TCDT, they are labeled based on the number of days used to calculate the average new cases.

For example, TCDT (7 Days) refers to the TCDT calculated by dividing the number of total cases by the average number of new cases over the past 7 days.

TCDT in the Philippines
As of August 7, 2020, the Philippines has a TCDT (7 Days) of 29.22 days, while a TCDT (14 Days) of 37.10 days. The country has been seeing a recent surge in cases, averaging out at around 3,000 - 4,000 cases per day. As a result, the TCDT dropped to a low on August 5; the lowest recorded since April 19 and 26 respectively. The Philippines surpassed Indonesia for the last time in TCDT on June 29 and July 15, and became the highest in Southeast Asia on August 6, 2020.

TCDT in Indonesia
As of August 7, 2020, Indonesia has a TCDT (7 Days) of 66.03 days, while a TCDT (14 Days) of 65.76 days. The country has faired slightly better than its northern neighbor by averaging at only around 2,000 cases per day, though has significantly less testing as cases gradually begin rising. Nevertheless, it's TCDT surpassed 60 days (2 months) on July 27 and August 1 for both 7 and 14 days. Indonesia has a relatively upward trend in TCDT compared to the Philippines' wavy graph.