effectiveSpread: retrieve effective spread for a symbol as dataframe
In schardtbc/iexcloudR: Wrapper for iexcloud Market Data Api

Description Usage Arguments Details Value Examples

This returns an array of effective spread, eligible volume, and price improvement of a stock, by market. Unlike volume-by-venue, this will only return a venue if effective spread is not ‘N/A’. Values are sorted in descending order by effectiveSpread. Lower effectiveSpread and higher priceImprovement values are generally considered optimal.

1	effectiveSpread(symbol)

symbol

stock symbol

Effective spread is designed to measure marketable orders executed in relation to the market center’s quoted spread and takes into account hidden and midpoint liquidity available at each market center. Effective Spread is calculated by using eligible trade prices recorded to the consolidated tape and comparing those trade prices to the National Best Bid and Offer (“NBBO”) at the time of the execution.

Data Weighting: 0 message units (as in free)

a dataframe