Look at what terms() (hence lm()) does with such formulae:
> str(terms(y~1*x))
Classes 'terms', 'formula' language y ~ 1 * x
..- attr(*, "variables")= language list(y, x)
..- attr(*, "factors")= int(0)
..- attr(*, "term.labels")= chr(0)
..- attr(*, "order")= int(0)
..- attr(*, "intercept
Rich:
> x <- 1:10
> y <- runif(10)
> lm(y ~ 1:x)
Call:
lm(formula = y ~ 1:x)
Coefficients:
(Intercept)
0.477
> lm(y ~ x:1)
Call:
lm(formula = y ~ x:1)
Coefficients:
(Intercept)
0.477
> lm(y ~ 1*x)
Call:
lm(formula = y ~ 1 * x)
Coefficients:
(Intercept)
0.477
> lm(y ~ x*1
I can't duplicate your examples
This is what I see
> y ~ 1:x
y ~ 1:x
Please try again in a vanilla R session, and send a reproducible example.
vanilla means start R from the operating system command line with
R --vanilla
this prevents any of your initialization files from being loaded. See
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