PredictedBytes is an analyzer in HexLasso which tells the coverage of how many bytes are predicted. The minimum possible value is zero, meaning not a single byte of the given block is covered, the maximum possible value is the size of the block in bytes, meaning all the bytes of the given block are covered.
The prediction is being made using a simple order-1 model using a dynamic prediction table which predicts, successfully or not, the next byte in the given block.
The prediction table is updated after each byte is read from the given block. The update, if needed, changes the prediction table that if the previous byte is seen again, it will predict the current byte.
Higher coverage of the predicted bytes means that the model returns more accurate prediction which indicates redundancy in the block. Analogously, lower coverage of the predicted bytes means less redundancy is seen by this model.
It is possible that not a single byte of the given block is covered and this indicates randomly distributed bytes.