 ያልሆኑ-የሙከራ ውሂብ በሲጋራና ግምቶች በማድረግ ላይ ግሩም መጽሐፍ ርዝመት ሕክምና ለማግኘት ይህንን ይመልከቱ Rosenbaum (2002), Rosenbaum (2009), Shadish, Cook, and Campbell (2001), እና Dunning (2012).
Fun tayọ iwe ipari awọn itọju lori ṣiṣe ifẹsẹmulẹ nkan lati ti kii-esiperimenta data ri Rosenbaum (2002), Rosenbaum (2009), Shadish, Cook, and Campbell (2001), ati Dunning (2012).