Which factor does NOT contribute to an appraisal's accuracy?

The factor that does not contribute to an appraisal's accuracy is indeed the personal biases of the appraiser. Appraisals are intended to be objective assessments of property value, relying on data, market conditions, and other measurable factors. When personal biases influence the appraisal process, the result can skew the valuation, making it inaccurate.

In contrast, a thorough market analysis is vital as it provides insight into recent sales, market trends, and comparable properties, forming the backbone of the appraisal process. Comparative property assessments also play an essential role, as they allow the appraiser to evaluate similar properties' selling prices to establish value benchmarks. A detailed examination of property conditions is critical as well since it informs the appraiser about the unique features, condition, and potential issues within the specific property, which directly affect its value.

Therefore, while all the other factors actively contribute to forming a precise appraisal, personal biases undermine the objectivity and reliability that the appraisal process requires.