How to calculate the month-on-month decline?

Year-on-year decrease calculation formula: Year-on-year increase or decrease = [(data of current period ÷ data of the same period of last year)-1]x 100%. If the calculated value is positive (+), it is growth; If the calculated value is negative (-), it is descending.

The specific development speed is the ratio of the reporting period level to the previous period level, which indicates the development speed of the phenomenon in different periods. If the comparison between each month of a year and last month is calculated, that is, February is 1 month, March is 1 month, and April is 1 month, indicating the development degree of each month. For example, we analyze the development trend of some economic phenomena during the fight against SARS, and the ring ratio is more telling than the same period last year.

Extended data:

The ring ratio reflects the development of parts less affected by the cycle. For example, comparing this month with last month, it is generally used on the day of the month and rarely used in the year, such as comparing the data of March this year and February this year.

Specifically, for a relatively stable period, the year-on-year comparison can better reflect the development situation, while in the case of poor overall background, due to the great changes in the inter-annual situation, the month-on-month comparison can better reflect the recovery situation. For example, the current economic crisis is better than that before the crisis. At present, the ring ratio can better reflect the state of economic recovery.