ments for an explanation. This is also explained in
    the dta spec.
    1 - 244 are strings of this length
                         Pandas    Stata
    251 - for int8      byte
    252 - for int16     int
    253 - for int32     long
    254 - for float32   float
    255 - for double    double

    If there are dates to convert, then dtype will already have the correct
    type inserted.
    r?