Background:
Adjustment to data
Commercial Floorspace Trend — Detail
Each CBECS estimate has a range of uncertainty because the CBECS is a sample survey (see Overview of the Commercial Buildings Energy Consumption Survey for further discussion). Changes between successive surveys are often not confirmed because the uncertainties of the estimates exceed the amount of change; however, change is confirmed if the trend continued across several survey cycles and the total change exceeded the uncertainties.
Amount of Commercial Floorspace
The floorspace trend is similar to the buildings trend. There was a statistically significant increase in floorspace from 1979 to 1992 (Figure 1). The apparent decline from 1992 (adjusted) to 1995 was not statistically significant (Figure 2).
Figure 1. 1979 to 1992 floorspace trend with 95% confidence ranges
Energy Information Administration
Commercial Buildings Energy Consumption Survey
Figure 2. 1989 to 1999 floorspace trend with 95% confidence ranges
Energy Information Administration
Commercial Buildings Energy Consumption Survey
Table 1. Amount of commercial floorspace, relative standard errors, and 95% confidence ranges by survey year
| Year |
Billion Square Feet |
Relative Standard Error (%) |
95% Confidence Range (billion sq. ft.) |
|---|---|---|---|
| 1979* | 51.088 | 3.6 | 47.483 to 54.693 |
| 1983* | 56.116 | 3.4 | 52.376 to 59.376 |
| 1986 | 58.199 | 3.0 | 54.777 to 61.621 |
| 1989 | 63.184 | 3.2 | 59.221 to 67.147 |
| 1992 | 67.876 | 3.7 | 62.954 to 72.798 |
| 1995 | 58.772 | 3.4 | 54.855 to 62.689 |
| 1999 | 67.338 | 3.5 | 62.719 to 71.957 |
| 1989** | 59.915 | 3.1 | 56.157 to 63.673 |
| 1992** | 64.269 | 3.6 | 59.734 to 68.804 |
|
* estimates adjusted to account for 1979 and 1983 undercount ** estimates adjusted to match the 1995 CBECS definition of target population |
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Energy Information Administration Commercial Buildings Energy Consumption Survey |
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Return to “Trends in Buildings and Floorspace”
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floorspace_detail.html
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