Human development index secondary data
8 | UNDP’s Human Development Index (HDI) Facebook Twitter Pinterest Ideal for when you want to look at the progress of a country on human as opposed to just economic development. Secondary data is the data that have been already collected by and readily available from other sources. Such data are cheaper and more quickly obtainable than the primary data and also may be available when primary data can not be obtained at all. Advantages of Secondary data. It is economical. It saves efforts and expenses. It is time saving.