Including a large number of variables in a formula.

The first idea works perfect.

Thank you!.

El mi?., 5 jun. 2019 a las 1:07, peter dalgaard (<pdalgd at gmail.com>)
escribi?:
Two ideas:

nn <- names(wageszm14)
lvadd <- nn[grep("^lvacb", nn)]

or

lvadd <- paste0("lvacb", 23:81)
lvadd <- lvadd[lvadd %in% names(wageszm14)]

On 5 Jun 2019, at 06:46 , Rolando I. Valdez via R-help <
r-help at r-project.org> wrote:
Hello,

I have almost 40 variables that I am trying to include in a formula.

I tried to include them using as.formula(), however the variables do not
follow a patter in the name. e.g. These variables are named like: lvacb23
lvacb30 lvacb300  lvacb40 .....  lvacb81.

lvadd <- paste0("lvacb", 23:81)
(fmla <- as.formula(paste("lwage ~ ", paste(lvadd, collapse = "+"))))
fit <- lm(fmla, data = wageszm14)
Error in eval(predvars, data, env) : object 'lvacb24' not found

The variable lvacb24 doesn't exist, because from lvacb23 it jumps to
lvacb30.

Thanks in advance for any help.
--
Rolando Valdez
Facultad de Econom?a y Relaciones Internacionales
Universidad Aut?noma de Baja California

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--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

Rolando Valdez
Facultad de Econom?a y Relaciones Internacionales
Universidad Aut?noma de Baja California

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Including a large number of variables in a formula.

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