I am very new to R software and i have to analyze a time-serie corresponding to the number of cases per day, from april, 2020 to the 1st of january 2021. In order to study acf and pacf ( Partial autocorrelation function) of the serie, i need first to convert it into time serie but for now i only have a dataframe (see below a sample). I am a bit lost with all the codes i read about the conversion (since it is for specific cases). If someone can help me with my case, i will be grateful.
Thank you in advance,
ps : sorry for my english