Hi all,

Forgive the potentially daft/simple question, but could anyone advise how I crop the confidence intervals here for (impossible) vales of y<0, please?

Thank you so much

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twoway ///
(scatter mbc_mean year [w=1/mbc_sem], mlabel("") xtitle(Year) ytitle(Mean Bacteriocidal Concentration) ylabel(0(5)20, angle(0) ) ) ///
(lfitci mbc_mean year)

Array