1. A method to analyze presentation of media content, the method comprising: scaling first measurement data for a monitored media content based on a first weighting factor to determine an estimate of a size of an audience of the monitored media content; dividing the estimate of the size of the audience of the monitored media content by a size of the audience of the monitored media content determined from a second measurement data for the monitored media content to determine an error rate; scaling third measurement data for an unmonitored media content based on a second weighting factor to determine an estimate of a size of the audience of the unmonitored media content; and multiplying, using a processor, the estimate of the size of the audience of the unmonitored media content by the error rate to determine a size of the audience of the unmonitored media content.