# base period

(redirected from Reference Periods)
Also found in: Dictionary, Medical, Encyclopedia.

## Base period

A particular period of time used for comparative purposes when measuring economic data.

## Base Period

The period of time against which an index is measured. For example, suppose the base period is 2001 and the initial value of an index is 100. If the index is 150 in 2009, it means that the value of the index is 50% higher in 2009 than it was in 2001. It is also called the reference period.

## base period

The time or period of time on which an index is based. Usually, the index is established at a value of 10 or 100 in the base year. The consumer price index of 177 in early 2002 indicated that consumer prices were 77% higher than during the base period of 1982-84. The Standard & Poor's 500 Stock Index of 1300 in early March 2002 indicated that, on average, a portfolio of blue chip stocks with a market value of \$10 during the period 1941-43 (the base period) had a market value of \$1,300 in early 2002. The portfolio of stocks making up the S&P 500 underwent substantial changes during the intervening years.

## base period

The point in time that serves as a reference for calculating financial and economic data.The base period value is usually set at 1.0 or 100, called the benchmark, for purposes of comparison,and then all other periods are either greater or less than the benchmark.

References in periodicals archive ?
diff] changes during the historical simulations for various CMIP5 models using rolling 30-yr reference periods.
This is partly because optimal reference periods are typically much longer, as the variability is larger relative to forced changes (see appendix D).
For other variables, such as precipitation, the optimal reference periods are likely to be much longer, as the variability is large relative to the changes.
Different length reference periods correspond to tubes of different lengths, with longer tubes required to have wider diameters.
The black dashed lines show the range of possible futures for a larger set of time series demonstrating that the uncertainty shrinks for later reference periods (as discussed later in Fig.
The results of three five-year reference periods and three ten-year reference periods are shown in Table 3.
For five of the six reference periods the difference is statistically significant with a market capitalization loss for the stock buyback portfolio (SBP) and a market capitalization gain for all other stocks.
The market capitalization change (from the beginning to the end of the reference period) for the large capitalization stock buyback portfolio (MCDSBP) stocks in Panel A is negative for all reference periods except the 2003 to 2012 reference period.
The evidence shows market capitalization declines for most of the reference periods for the stock buyback portfolio relative to the portfolio of all other stocks.
One-year reference period in certain sectors (processing industry, tourism) established in law whereas it is only authorised under collective agreements.
The reference period can be raised under legislation to 12 months.
In this analysis, a FFS beneficiary is defined as being enrolled in Part A and/or Part B with a coverage type code equal to 9 (FFS coverage) for at least one month of the 12-month reference period.

Site: Follow: Share:
Open / Close