I would like to use GLM to estimate 500 regressions like

`beta[1] = coef(lm(@formula(AAPL ~ SP500), Stocks))[2]`

`beta[2] = coef(lm(@formula(AMGN ~ SP500), Stocks))[2]`

ā¦

`beta[i] = coef(lm(@formula(col_i ~ SP500), Stocks))[2]`

where Stocks is a `Dataframe`

with 501 columns. Column names are `symbols`

, but I believe that GLM does not accept symbols (or strings) as variable names.

How may I transform my vector of symbols of 500 column names in such a way that they are accepted by GLM?

Thanks in advance.