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Sampling for qualitative research

The probability sampling techniques used for quantitative studies are rarely appropriate when conducting qualitative research. This article considers and explains the difference...

1996 Family Practice 4022 citations

A new approach to variable metric algorithms

An approach to variable metric algorithms has been investigated in which the linear search sub-problem no longer becomes necessary. The property of quadratic termination has bee...

1970 The Computer Journal 3951 citations

Convergence

A key economic issue is whether poor countries or regions tend to grow faster than rich ones: are there automatic forces that lead to convergence over time in the levels of per ...

1992 Journal of Political Economy 3887 citations