From rhelp at eoos.dds.nl  Fri Oct  6 12:08:19 2017
From: rhelp at eoos.dds.nl (Jan van der Laan)
Date: Fri, 6 Oct 2017 12:08:19 +0200
Subject: [Rd] Using response variable in interaction as explanatory variable
 in glm crashes R
Message-ID: <465314b6-1c01-7c41-9ccd-554e8ca63c9f@eoos.dds.nl>


The following code crashes R (I know I shouldn't try to estimate such a 
model; this was a bug in some code of mine). I also tried with R-devel; 
same result.


tab <- structure(list(dob_day = c(FALSE, FALSE, FALSE, FALSE, TRUE,
TRUE, TRUE, TRUE), dob_mon = c(FALSE, FALSE, TRUE, TRUE, FALSE,
FALSE, TRUE, TRUE), dob_year = c(FALSE, TRUE, FALSE, TRUE, FALSE,
TRUE, FALSE, TRUE), n = c(1489634L, 17491L, 134985L, 1639L, 47892L,
611L, 4365L, 750L), pred1 = c(1488301, 18187, 135605, 1657, 48547,
593, 4423, 54)), .Names = c("dob_day", "dob_mon", "dob_year",
"n", "pred1"), row.names = c(NA, -8L), class = "data.frame")

m <- glm(dob_mon ~ dob_day*dob_mon, data = tab, family = binomial())


The crash doesn't when the variables are added just as main effects 
(dob_day+dob_mon): this results in a warning and the removal of dob_mon 
from the formula.

--

Jan



 > R.version
 ?????????????? _
platform?????? x86_64-pc-linux-gnu
arch?????????? x86_64
os???????????? linux-gnu
system???????? x86_64, linux-gnu
status
major????????? 3
minor????????? 4.1
year?????????? 2017
month????????? 06
day??????????? 30
svn rev??????? 72865
language?????? R
version.string R version 3.4.1 (2017-06-30)
nickname?????? Single Candle



[Rd] Using response variable in interaction as explanatory variable in glm crashes R
Jan van der Laan