有个stata数据，要打开时就会提示no room to add more observations
    An attempt was made to increase the number of observations beyond what is
    currently possible.  You have the following alternatives:
     1.  Store your variables more efficiently; see help compress.  (Think of
         Stata's data area as the area of a rectangle; Stata can trade off width
         and length.)
     2.  Drop some variables or observations; see help drop.
     3.  Increase the amount of memory allocated to the data area using the set
         memory command; see help memory.
本人不会用stata。之前可以把stata文件另存为stata9.0然后用spss打开，但是这个不行。有哪位能够帮忙啊？