Dividend Low-Volatility ETF 512890 Data Analysis

Problem It Solves

The dividend low-volatility ETF 512890 had a share split on 2021-10-22, so comparing unit NAV or simple price changes can be distorted by the 1-for-2 adjustment and makes cross-period return analysis harder. Using accumulated NAV preserves the real total return while avoiding special-case handling for the split. This skill turns fetching, weekly-bar construction, MA60W calculation, and year-over-year comparison into a repeatable workflow for reviewing one ETF against its 60-week moving average.

How It Works and Where It Fits

Key outputs include:
- Paginated fetching of full historical NAV from the Eastmoney API with pageSize fixed at 20.
- Weekly bars built from the last trading day of each week, then a 60-week moving average calculated on accumulated NAV; N/A is shown before 60 weeks.
- A table of year-end and latest data with accumulated NAV, actual return, MA60W, NAV/MA60W, and deviation from MA60W.

It fits historical moving-average comparison, drawdown-window inspection, and simple year-end MA extrapolation for 512890. It depends on external API structure: TotalCount appears at the response top level, the date field is FSRQ, and curl -k is used to bypass certificate issues. If the API changes or fields are missing, the script needs updating. It does not forecast returns or issue trading signals.