This system would be very hard to disprove by using observational data alone.

But almost two years of effort to do so has yielded observational data that only support the conclusion.

To begin with, it was, but in late 1963 some observational data made it appear to be more than that.

In these situations, a clinical investigator may consider a design and analysis based on observational data (Table 1).

CarbonTracker includes access to the following model and observational data.

"It's a doctor's dream in terms of being able to get observational data that's real world," he said.

Although these parameters were calculated for female fish, observational data suggests the male life history is similar.

A number of ways are available to gather observational data for use in functional models.

"We now have studies that can identify this fingerprint in the observational data."

The scientific studies actually consisted of observational data rather than using such photographs.