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I am currently practicing my data visualization skills with ourworldindata dataset. I noticed there is a negative value of new_cases in Benin country. Out of curiosity, what does that mean? I mean, why would the new_cases has a negative value?

Here is where the negative value is found. enter image description here

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Looks like that number is calculated from the total_cases column. Value = "total_cases from day before" - "total_cases of that day". In this case: -209 is 130 - 339. Not sure why that number would decrease, but could be they changed the way they count, or just an error in the data.

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Maybe they found out that they wrong identified 209 patient as positive and when they found out that they just subtracted those wrong result to make the total case correct.

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