V-Lab
Bangladesh Dhaka Stock Exchange Broad Index APARCH Volatility Analysis
Volatility prediction for Sunday, October 4th, 2026
1 Day
9.90%
decreased by 0.58%
1 Week
10.16%
decreased by 0.32%
1 Month
11.14%
increased by 0.66%
Analysis last updated: Friday, October 2, 2026 at 05:47 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 28, 2013 to Oct 1, 2026Model Insight
With persistence 0.999, volatility shocks have a half-life of 651 trading days (~2.6 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 48% more than positive returns
σ
APARCH Model
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High persistence: persistence 0.999, shock half-life ~651 daysLeverage: Negative returns increase volatility 48% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0108 | 4.25*** |
| αARCH | 0.1925 | 11.67*** |
| βGARCH | 0.8075 | 42.02*** |
| γleverage | 0.1006 | 2.35** |
| δpower | 1.9584 | 7.68*** |
0.999
Persistence651d
Half-lifeσ
APARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0108 | 4.25*** |
α ARCH Response to squared shocks | 0.1925 | 11.67*** |
β GARCH Volatility persistence | 0.8075 | 42.02*** |
γ leverage Additional response to negative shocks | 0.1006 | 2.35** |
δ power Transformation power | 1.9584 | 7.68*** |
Persistence:
0.999
Half-life:
651 days
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