Secondly, we show the equivalence theorems between mean shift model and outlier detection model based on the condition that errors in regression model are normally distributed.

However, Catford's theory has some deficiencies. The shift model he proposes only takes effect on and below the level of sentence, and does not take textual and pragmatic factors into account.

With the paradigm shift from client server model to the cloud computing model, IT workers will need new sets of skills.