Indirect estimates of temperature change from such sources as tree rings and ice cores help to place recent temperature changes in the context of the past. (royalsociety.org)
«But up to now, that's been from indirect estimates or models. (discovermagazine.com)
From this analysis, they estimated, with 93 percent certainty, that somewhere between 17 and 35 percent of Americans are atheists, with a «most credible indirect estimate» of 26 percent. (scientificamerican.com)