Regression in R with grouped variables -

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the dependent variable value of data frame df predicted using independent variables mean, x, y in following way:

df <- df %>%      group_by(country, sex) %>%     do({          mod = lm(value ~ mean + x + y, data = .)          <- predict(mod, .)         data.frame(., a)     })

data grouped country , sex. so, fitting formula can expressed as:

value(country, sex) = a0(country, sex) + a1(country, sex) mean + a2(country, sex) x + a3(country, sex) y

however, want use formula:

value(country, sex) = a0(country, sex) + a1(country, sex) mean + a2(country) x + a3(country) y

where a2 , a3 independent of sex. how can it?

i don't think can when grouping country , sex. group country , add interactions sex:

df <- df %>%  group_by(country) %>% do({      mod = lm(value ~ sex + mean*sex + x + y, data = .)      <- predict(mod, .)     data.frame(., a) })

or estimate model in 1 go adding interactions sex , country:

mod <- lm(value ~ sex*country*mean + country*x + country*y <- predict(mod)

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