d STB-60 dm67_1.  Enhancements to numbers of missing and present values
d STB insert by Nicholas J. Cox, University of Durham, UK  
d Support:  n.j.cox@@durham.ac.uk 
d After installation, see help ^nmissing^, ^npresent^

f dm67_1/nmissing.ado 
f dm67_1/nmissing.hlp 
f dm67_1/npresent.ado 
f dm67_1/npresent.hlp