根据 vs 据 (based on vs formal shorthand)

Long form, telegram form

• Both mean "according to / based on".
• according to根据gēn jù = on the basis of — takes a full object (according to根据gēn jùinvestigation调查diào chá).
• according to据jù = a formal, written shorthand — lives in set phrases (it is said that据说jù shuō, according to据jùto report (news)报道bào dào).

according to根据gēn jù = based on (full object)

• according to根据gēn jùinvestigation调查diào chá，everyone大家dà jiāall / both都dōuto agree同意tóng yì = "according to the survey, everyone agrees."

based on根据gēn jùthe survey调查diào chá，everyone大家dà jiāall都dōuagrees同意tóng yì。

• according to根据gēn jùinvestigation调查diào chá = "according to the survey."

according to据jù = formal shorthand

• it is said that据说jù shuōhe / him他tāwant / will / need要yàoto walk走zǒu(completed / change)了le = "it's said he's leaving." (according to据jù + a fixed phrase)

it's said据说jù shuōhe他tāgoing to要yàoleave走zǒu了le。

• it is said that据说jù shuōhe / him他tāwant / will / need要yàoto walk走zǒu(completed / change)了le = "it's said he's leaving."

Recap

Read the full reference: HSK 6 grammar — Comparing similar adverbs.