how to pass a first order line from part of the plot that has the most of the data?

hello

i have these set of data. y1 vs y2, y2 is in x axis. most of the data seems to be on regular pattern which a first order line can be assed from, but small number( 3 or 4) are deviated. how can i omit them and make the line to pass from the part that has the most of the data.

thanks in advance

Answer 1

[madhan ravi]

y1(y1==3 | y1==4)=[] %removes 3 and 4 
y2(y2==3 | y2==4)=[]

[ali mohebi]

by 3 or 4 i mean maybe 3 or 4 out of the whole data set may be fall far apart from the range, not just 4 and 3!