1.  Difficulties of finding comparable data prevent detailed comparison of press contents from year to year.

2.  So far as other sectors are concerned, there are no comparable data.

3.  In theory, it exists to provide comparable data on the environment and thereby aid and encourage appropriate legislative response to ecological damage.

4.  One of the main functions of the report, however, is to demonstrate the difficulty of acquiring meaningful comparable data on world environmental problems.

5.  Comparable data on Aid to Families with Dependent Children, the third benchmark, is incomplete.

6.  He added that there are no other cities or counties that have comparable data.

7.  Many include more of a wider range of crimes, for example, though fewer include comparable data on injuries and property damage from car crashes.

8.  The filing did not provide comparable data from the year-earlier period.

9.  There are no comparable data for visitors on pleasure trips, but many overstay their visas, Bergeron said.

10.  They were among the first detailed state figures released by the Census Bureau, which is to make public comparable data for New York and Connecticut later this month.