Update README.md

README.md

@@ -46,8 +46,8 @@ dataset = load_dataset("LeoTungAnh/kdd210_hourly")
 ```
 
 **Dataset Card for Air Quality in KDD cup 2018**
-Originally, the dataset is from KDD cup 2018, which consists of 270 time series data with different starting time. This dataset encompasses 210 hourly time series data points starting from 2017-01-01T14:00:00. The dataset reveals the air quality levels in 59 stations in 2 cities from 01/01/2017 to 31/03/2018.
 
+Originally, the dataset is from KDD cup 2018, which consists of 270 time series data with different starting time. This dataset encompasses 210 hourly time series data points starting from 2017-01-01T14:00:00. The dataset reveals the air quality levels in 59 stations in 2 cities from 01/01/2017 to 31/03/2018.
 
 **Preprocessing information**:
 - Grouped by hour (frequency: "1H").
@@ -57,6 +57,7 @@ Originally, the dataset is from KDD cup 2018, which consists of 270 time series
   2. Replacing NaN values with zeros.
     
 **Dataset information**:
+- Missing values are converted to Zeros.
 - Number of time series: 210
 - Number of training samples: 10802
 - Number of validation samples: 10850 (number_of_training_samples + 48)