Task: Translation
Input (English): English sentence: Internal validity can be difficult to ensure in complex field experiments. See, for example, Gerber and Green (2000), Imai (2005), and Gerber and Green (2005) for debate about the implementation of a complex field experiment about voting.
Output (Igbo): Dá»‹ka mụmaatụ, dá»‹ka mụmaatụ, Gerber and Green (2000), Imai (2005), na Gerber and Green (2005) maka arụmụka gbasara mmejuputa usoro mịiko dá»‹ mgbagwoju anya banyere ntuli aka.