Transparency
Data Provenance & Quality Standards
Full transparency on where our data comes from, how often it updates, and what quality checks we apply before displaying it.
Official Data Sources
All data is sourced exclusively from official government, regulatory, and exchange APIs. No third-party data vendors with commission conflicts.
| Source | Data Type | Update Frequency | Quality Gate |
|---|---|---|---|
AMFI India Official source | Mutual Fund NAVs & Scheme Details | Daily (post 10:00 PM IST) | >40% NAV spike rejection, zero/negative rejection |
NSE India Official source | Equity Bhavcopy, Index Data | Real-time (1-minute intervals during market hours) | Stale timestamp check, range validation |
BSE India / Yahoo Finance Official source | BSE Sensex, Global Indices | 1-minute intervals | Format validation, fallback to cached values |
APMI (India) Official source | PMS & SIF Strategy Performance | Monthly (post-disclosure) | 30%+ return spike rejection |
RBI India Official source | Risk-Free Rate (91-day T-Bill Proxy 6.50%) | Quarterly review | Manual review by quantitative team |
Quantitative Rating Model — v1.0
CAGR Calculation
Date-exact: (EndNAV/StartNAV)^(365.25/Days) − 1
Standard Deviation
Sample SD annualized by √250 (Indian equity convention)
Risk-Free Rate
6.50% (91-day GoI T-Bill proxy)
Sharpe Ratio
(Annualized Return − Rf) / Annualized SD
Sortino Ratio
(Annualized Return − Rf) / Downside Deviation (MAR = Rf)
Star Rating
Bell-curve distribution within category peer group
XIRR Engine
Newton-Raphson with bisection fallback, Decimal.js precision 28
Tax Engine
Sec 112A LTCG 12.5% above ₹1.25L, STCG 20%, FY 2026-27
InvestResearch India is committed to full data transparency. For data correction requests or queries, contact: [email protected]