st: puzzling "missing" before and after "gen newvar = mdy(a, b, c)"

[Michael McCulloch <mm@pinest.org>]

Hello,
I've converted a string date (yyyymmdd) to Stata format, using:

. * convert datedx to Stata format
. tostring datedx, replace
        datedx was double now str8
. generate str4 dxyr1= substr(datedx,1,4)
. generate str2 dxmo1 = substr(datedx,5,6)
. generate str2 dxda1 = substr(datedx,7,8)
. destring dx*, replace
        dxyr1 has all characters numeric; replaced as int
        dxmo1 has all characters numeric; replaced as byte
        dxda1 has all characters numeric; replaced as byte
. gen datedx1 = mdy(dxmo1, dxda1, dxyr1)
        (387 missing values generated)
. format datedx1 %d

However, search for missing values before & after my commands yields nothing:
. list datedx if missing(datedx) in 1/10

Where might the missing 387 values have originated?




Best wishes,
Michael


____________________________________

Michael McCulloch
Pine Street Clinic
Pine Street Foundation
124 Pine Street, San Anselmo, CA 94960-2674
tel     415.407.1357
fax     415.485.1065
email:  mm@pinest.org
web:    www.pinest.org
        www.pinestreetfoundation.org
        www.medepi.net/meta





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