For bothsamples ,the match is performed in Years T-1,T+1, T+2 separately, t statistics are corrected forcross-sectional and time-series correlation using a two-way cluster at the firmand year level.
Wecluster the standard errors at both the firm and year level to obtain standarderrors that are robust to heteroskedasticity,serial correlation andcross-sectional correlation(Petersen,2009; Gow et al.,2010).
请翻译这两段话,并告诉我什么是是two-way cluster?用什么软件的什么功能做two-way cluster?谢谢各位!