During a four - year period, the researchers used sensors to measure relative changes in the velocity of seismic waves moving through the volcano over time. (sciencedaily.com)
Then graphed the prices of all publishers indexed to 1.00 so we can see relative changes over the course of the year. (blog.pricecharting.com)
Still, there remains much to be gleaned by comparing relative changes in school and district performance, along with comparisons between districts and schools with similar student demographics. (apluscolorado.org)