What type of percent is each item expressed as in a horizontal analysis in accounting?

In a horizontal analysis, each item is typically expressed as a percentage of a base year amount. This allows for comparison of financial data over multiple periods by showing the change in each item relative to the base year's figure. The percentage is calculated by taking the difference between the current period and the base period amounts, dividing it by the base period amount, and then multiplying by 100. This method highlights trends and growth patterns in financial statements.