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stat_prop.proportion_effectsize(base_retention + 0.03, base_retention) sample_size = 2*stat_power.tt_ind_solve_power( effect_size = ret_effect_size, alpha = 0.05, power = 0.9, nobs1 = None, # we specified nobs1 as None to get an estimation for it alternative='larger' ) # ret_effect_size = 0.0632,