[R] Test For Difference of Betas By Group in car

Hello R-Helpers, I was looking into how to test whether the beta coefficient from a regression would be the same for two different groups contained in the dataset for the regression. When I put that question into google, AI returned a very nice looking answer (and a couple of variations on it)

Re: [R] Help Parsing String? From HTML

__ From: Joshua Ulrich Sent: Sunday, January 5, 2025 2:55 PM To: Sparks, John Cc: r-help@r-project.org Subject: Re: [R] Help Parsing String? From HTML CAUTION: External Sender On Sun, Jan 5, 2025 at 2:03 PM Sparks, John via R-help wrote: > > Hi, > > I am scraping some data

[R] Help Parsing String? From HTML

Hi, I am scraping some data from the internet and I got what I want but in a big long string (sort of) and can't figure out a way to parse it. What I have gotten to is > mystring {xml_nodeset (1)} [1] {\n "symbol": "ABI",\n "open": 21.04,\n "high": 21.05,\n "low": 20.06,\n "close": 20.2,\

Re: [R] Using library(TTR) Calculate ATR by Symbol

I don't see atr_df appearing in my current directory. Also, I assume that the input data frame is named ohlc? Or am I missing something. Thanks, --JJS From: Joshua Ulrich Sent: Sunday, January 5, 2025 11:31 AM To: Sparks, John Cc: R-help@r-project.org Subjec

Re: [R] Using library(TTR) Calculate ATR by Symbol

Thanks! Appears helpful and the quick turnaround is very much appreciated. I'll do some testing now. --JJS From: Joshua Ulrich Sent: Sunday, January 5, 2025 11:31 AM To: Sparks, John Cc: R-help@r-project.org Subject: Re: Using library(TTR) Calculate ATR by Sy

[R] Using library(TTR) Calculate ATR by Symbol

Hi, In looking at the documentation for the TTR library and particularly the example for calculating the ATR (average true range). The example shows how to calculate ATR for a file of a single stock. If I have multiple stocks in one file, isn't there a way to get the ATR for each of them? Or