[R] the formula of quantile regression for panel data, which is correct?

[ywh123]

Hi,everyone
I have  some trouble in understanding the formula.
http://r.789695.n4.nabble.com/file/n3033305/%E6%9C%AA%E5%91%BD%E5%90%8D.jpg 
http://r.789695.n4.nabble.com/file/n3033305/%E6%9C%AA%E5%91%BD%E5%90%8D1.jpg 

which is correct?

best wish.
thanks
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