Effective Preprocessing and Normalization Techniques for COVID-19 Twitter Streams with POS Tagging via Lightweight Hidden Markov Model

Table 13

Overall plotting parameters for ROC utilized for tweet preprocessing.

Plotting parameters	Investigating OOV words in tweets	Tweet normalization and preprocessing	Evaluated POS tagging for tweets
Number of cases	2108	450	950
Number of correct	1907	412	702
Accuracy	77.5%	84%	73.9%
Sensitivity	75%	88%	68.6%
Specificity	80%	80%	79.2%
Positive cases missed	107	77	149
Negative cases missed	94	53	99
Fitted ROC curve	0.85	0.90	0.79