Secondary data produced by the governments/charities/businesses on a wide range of issues (crime, divorce)
Hard stats
Objective, politicians can't change them, e.g. births and marriages
Soft stats
Subjective and politicians can change them, e.g. stats on poverty, crime and employment
Examples of official stats
UK Census - survey of every household carried out every 10 years
TV ratings
Weaknesses on official stats
Lack validity, government may present stats in a biased way, manipulate to make their politics more favourable, e.g. crime stats may say more about policing than actual crime factors
Definitions and the way data is collected may vary, impossible to compare data, definition of unemploymentchanges
Strengths
Practical = collected at regular intervals showing trends and patterns > cause and effect relationships. Gov. collects stats for it's own purpose, doesn't explain reason
Representative = good basis for generalisations and testing hypothesis > covers large numbers. Sometimes stats are manipulated to make a country look better
Reliable = complied in standardized way by trained staff. Could make errors
Valid = hard stats measure what they claim to measure, soft stats less valid (police stats don't record all crimes)