8731.0 - Building Approvals, Australia, Feb 2018 Quality Declaration 
ARCHIVED ISSUE Released at 11:30 AM (CANBERRA TIME) 04/04/2018   
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WHAT IF...? REVISIONS TO TREND ESTIMATES


EFFECT OF NEW SEASONALLY ADJUSTED ESTIMATES ON TREND ESTIMATES


TREND REVISIONS

Recent seasonally adjusted and trend estimates are likely to be revised when original estimates for subsequent months become available. The approximate effect of possible scenarios on trend estimates are presented below. Generally, the greater the volatility of the original series, the larger the size of the revisions to trend estimates. Analysis of the building approval original series has shown that they can be revised substantially. As a result, some months can elapse before turning points in the trend series are reliably identified.

The graphs and tables which follow present the effect of two possible scenarios on the previous trend estimates: that the March seasonally adjusted estimate is higher than the February estimate by 2.6% for the number of private sector houses approved and 15.3% for private sector dwellings excluding houses approved; and that the March seasonally adjusted estimate is lower than the February estimate by 2.6% for the number of private sector houses approved and 15.3% for private sector dwellings excluding houses approved. These percentages represent the average absolute monthly percentage change for these series over the last ten years.

APPROVED PRIVATE SECTOR HOUSES

Graph: Private sector houses approved

WHAT IF NEXT MONTH'S SEASONALLY ADJUSTED ESTIMATE:
Trend as published
(1) rises by 2.6% on Feb 2018
(2) falls by 2.6% on Feb 2018
no.
% change
no.
% change
no.
% change
2017
September
9 932
0.2
9 927
0.2
9 938
0.3
October
9 930
-
9 921
-0.1
9 940
-
November
9 931
-
9 925
-
9 935
-0.1
December
9 944
0.1
9 961
0.4
9 935
-
2018
January
9 964
0.2
10 020
0.6
9 936
-
February
9 988
0.2
10 091
0.7
9 933
-
- nil or rounded to zero (including null cells)


APPROVED PRIVATE SECTOR DWELLINGS EXCLUDING HOUSES

Graph: Private other dwelling units approved

WHAT IF NEXT MONTH'S SEASONALLY ADJUSTED ESTIMATE:
Trend as published
(1) rises by 15.3% on Feb 2018
(2) falls by 15.3% on Feb 2018
no.
% change
no.
% change
no.
% change
2017
September
8 854
1.2
8 848
1.2
8 892
1.7
October
8 840
-0.2
8 823
-0.3
8 901
0.1
November
8 762
-0.9
8 754
-0.8
8 793
-1.2
December
8 674
-1.0
8 708
-0.5
8 606
-2.1
2018
January
8 598
-0.9
8 700
-0.1
8 363
-2.8
February
8 505
-1.1
8 720
0.2
8 085
-3.3