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CCPI 2006-07=100, Core

Colombo Consumer Price Index (CCPI). Index, monthly.

LevelYoY %MoM %12-month avg %
Base 2006/07
195220022006/0720132021Spliced

Data source: Department of Census and Statistics, CBSL Economic Data Library (wizard)

Macro Lab · LK.CPI.CCPI.2006-07.CORE.M · CC BY 4.0

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About this series

  • Source Department of Census and Statistics, compiled by Macro Lab
  • Unit Index
  • Base year 2006/07
  • Date range Jan 2008 – Dec 2016
  • Last checked 17 Feb 2017

Checks: 6 recorded for this series, listed below. Compiled by Department of Census and Statistics, read from the Central Bank of Sri Lanka.

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Details

Name in the warehouse
CCPI 2006-07=100, Core
Base year
2006/07
Read from
CBSL Economic Data Library (wizard) (Central Bank of Sri Lanka)
Source page
https://www.cbsl.lk/eresearch
Notes
Only machine-readable source for this base year: the DCS releases do not publish it (docs/conventions.md override).

Source documents

Read from the CBSL Economic Data Library (wizard), which serves values rather than files.

Vintages

One vintage so far, published 17 Feb 2017. Revisions show here once a later release changes a value.

Related series

Source discrepancies

What the warehouse found when it checked this series: the same figure from two agencies, splice overlaps, published rates against ones recalculated from the index, and outliers.

  • Error in the sourceMay 2016

    The value moves 922% in one period, from 184 to 1,881, far outside its usual range.

    Outlier: 184 and 1,881.1, difference 922.3.

    moves 922% from 2016-04-01, 547 deviations outside this series' own normal; check the source

    CBSL Data Library serves 1,881.10 for 2016-05; its own month-on-month series implies 188.05. Flagged from both sides, entering and leaving the spike.

  • Error in the sourceJun 2016

    The value moves 90% in one period, from 1,881 to 188.8, far outside its usual range.

    Outlier: 1,881.1 and 188.8, difference −90.

    moves -90% from 2016-05-01, 542 deviations outside this series' own normal; check the source

    CBSL Data Library serves 1,881.10 for 2016-05; its own month-on-month series implies 188.05. Flagged from both sides, entering and leaving the spike.

  • Error in the sourceMay 2016

    The published rate is 965.8%; recalculated from the index it is 6.6%. Compared with LK.CPI.CCPI.2006-07.CORE.YOY.M.

    Published vs recalculated: 6.6 and 965.78, difference −959.18.

    published year-on-year vs recomputed from the index

    Consequence of the same typo: the published year-on-year is 6.6%, recomputing from the corrupted index gives 966%.

  • Error in the sourceMay 2016

    The value jumps from 184 to 1,881 and back, the pattern of a misplaced decimal point.

    Reversion: 184 and 1,881.1, difference 1,697.1.

    184 -> 1,881 -> 188.8: away and back within two periods, the shape of a misplaced decimal point

    Same value. This is the check that identifies it precisely: away and back inside two months.

  • Error in the source

    The two base years overlap for 36 months (Jan 2014 – Dec 2016). Over those months the ratio between them runs from 0.0478 to 0.488; the splice uses 0.479. Compared with LK.CPI.CCPI.2013.CORE.M.

    Splice overlap: 0.048 and 0.488, difference 0.44.

    36 overlapping months 2014-01-01..2016-12-01, factor 0.478700; left out of the factor: 2016-05-01

    The 2016-05 typo falls inside the 36-month overlap, which is why the ratio spread is so wide where every other splice spans a few per cent. An earlier version of this note said the splice used the median and was unharmed; it used the mean, and the typo pulled the 2006/07-to-2013 core factor from 0.6204 to 0.6049, leaving the spliced core index about 2.4% too low for 2003-2013. The splice now leaves out any month more than 50% from the overlap's median - wide enough that the genuine drift between differently weighted indices is kept - and names it in the check.

  • For information

    The two base years overlap for 41 months (Jan 2008 – May 2011). Over those months the ratio between them runs from 0.329 to 0.354; the splice uses 0.337. Compared with LK.CPI.CCPI.2002.CORE.M.

    Splice overlap: 0.329 and 0.354, difference 0.025.

    41 overlapping months 2008-01-01..2011-05-01, factor 0.336977

    Every splice reports the spread of its overlapping-month ratios so the chain factor can be judged. A few per cent is normal.

Errors first. 1 more check for information.