which method is used for heteroskedasticity correction does gretl do heteroskedasticity correction? what is gls estimation which software can detect serial correlation how to gls estimation with serial correlation what software does the serial correlation correction use? can you do heteroskedasticity correction why use heteroskedasticity correction which software enables the gls estimation can gls estimation be used for heteroskedasticity what software for serial correlation in gls which software does heteroskedasticity and serial correlation corrections what software can be used for heteroskedasticity correction can you correct heteroskedasticity in gretl can a serial correlation correction be done gls gls estimation with heteroskedasticity correction what software to do a heteroskedasticity correction what software to use for heteroskedasticity correction what software does heteroskedasticity correction include what program is used to do heteroskedasticity correction