# getSpReturns = function(inds, startDate = NULL, endDate = NULL){
# require(xts)
# require(PerformanceAnalytics)
# if(is.null(startDate))
# startDate = start(inds)
# if(is.null(endDate))
# endDate = end(inds)
# sp = inds[,"SPTR"]
# sp = na.omit(sp)
# sp=CalculateReturns(sp)
# return(na.omit(sp[paste(startDate,endDate,sep = "/"),]))
# }
getSpIndex = function(){
# require(xts)
# require(PerformanceAnalytics)
# require(quantmod)
quantmod::getSymbols('^SP500TR', from = "1980-01-01")
sp = quantmod::Ad(SP500TR)
names(sp)[1] = "SPTR"
return(sp)
}
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