Because some districts were affected while others were not, he was also able to provide unusually convincing evidence on the effect of changes in the number of instructional days. (educationnext.org)
These look much better because the dependent variable seems to be adjusting relatively well for changes in the number of seats. (blog.politics.ox.ac.uk)
Depending on a number of factors policy holders can expect to see changes in a number of areas. (armourinsurance.ca)