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Questions about plot of means

Hi, i wanna plot the plot of means of NO2 in monthly based. Data are Daily NO2  concentration from 2006-02-01 to 2016-12-31. I have already done 

"months(Dataset$Date)". After creating the new factor, I don't know how to edit formula of "plotmeans".

i had tried ( plotmeans(Eastern_no_2006_Jan$DATE~months,bars=TRUE,p=0.95) ) and it is not working, can anyone help?? 



Sam Cheung