non-numeric argument to binary operator

It looks like you are attempting to divide a number by a formula.
5 / (a ~ b)
Error in 5/(a ~ b) : non-numeric argument to binary operator

Hi,
I'm working on following dataset.

dput(uu5)
structure(list(grup = structure(c(1L, 1L, 2L, 2L), .Label = c("1",
"2"), class = "factor"), bw_grp = structure(c(1L, 2L, 1L, 2L), .Label =
c("0-999",
"1000+"), class = "factor"), deaths = c(6L, 13L, 1L, 2L), pop = c(26L,
67L, 41L, 93L), bw = c(500L, 1500L, 500L, 1500L), rates =
c(23.0769230769231,
19.4029850746269, 2.4390243902439, 2.1505376344086), pct =
c(0.279569892473118,
0.720430107526882, 0.305970149253731, 0.694029850746269), logexpo =
c(3.25809653802148,
4.20469261939097, 3.71357206670431, 4.53259949315326), grup1 = c(1,
1, 0, 0)), .Names = c("grup", "bw_grp", "deaths", "pop", "bw",
"rates", "pct", "logexpo", "grup1"), class = c("grouped_df",
"tbl_df", "tbl", "data.frame"), row.names = c(NA, -4L), vars = list(
    grup), labels = structure(list(grup = structure(1:2, .Label = c("1",
"2"), class = "factor")), row.names = c(NA, -2L), class = "data.frame",
vars = list(
    grup), drop = TRUE, .Names = "grup"), indices = list(0:1,
    2:3), drop = TRUE, group_sizes = c(2L, 2L), biggest_group_size = 2L)

When I try;
uu4 <- mutate(uu4, logexpo = log(pop), grup1 = as.numeric(group == 1 ))
fit <- glm(deaths ~ agegrp + grup1 + offset(log(pop)), data = uu4, family =
poisson)
coef(summary(fit))
exp(coef(fit)["grup1"])
data.frame(deviance(fit), df=fit$df.residual)
deviance(fit)/(fit$null.deviance ~ deviance(fit))
this code, I get an error related to last line:

Error in deviance(fit)/(fit$null.deviance ~ deviance(fit)) :
  non-numeric argument to binary operator

What's wrong? How can I correct this problem?
Thanks in advance.

PS: R version 3.3.2 (2016-10-31) -- "Sincere Pumpkin Patch"

--
Zeki ?atav
http://zekicatav.com <http://zekicatav.tyih.gov.tr>
twitter.com/zcatav

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non-numeric argument to binary operator

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