r - Short code to extract fitted value from tbl_df objects -


i have data set containing groups of data , performed regression on on each group of data. used dplyr regression , tbl_df object results. want extract fitted value vector each group of regression , put them in data frame. used use summarise() extract relevant information conveniently. works scalars. here sample code lapply used extract information , feel kind of cumbersome:

library(dplyr) library(reshape2)  df1 = data.frame(type1 = c(rep('a',5),rep('b',5)),              x = 1:10,              y = 11:20)  df1 %>%   group_by(type1) %>%  do(model = lm(y~x,.)) -> model1  names(model1$model) = model1$type1  lapply(model1$model,function(mod) mod$fit) %>%    melt 

library(broom) model1 %>% augment(model) 
# tibble: 10 x 10 # groups:   type1 [2]     type1     y     x .fitted      .se.fit        .resid  .hat       .sigma      .cooksd   .std.resid    <fctr> <int> <int>   <dbl>        <dbl>         <dbl> <dbl>        <dbl>        <dbl>        <dbl>  1         11     1      11 2.482534e-16  3.567051e-19   0.6 3.925229e-16 2.322633e-06  0.001759785  2         12     2      12 1.755417e-16  3.026750e-16   0.3 2.977199e-16 2.730293e-01  1.128776594  3         13     3      13 1.433292e-16 -3.857170e-16   0.2 2.471607e-16 2.263176e-01 -1.345563357  4         14     4      14 1.755417e-16 -1.380180e-16   0.3 3.747906e-16 5.677113e-02 -0.514715401  5         15     5      15 2.482534e-16  2.207032e-16   0.6 3.052655e-16 8.891591e-01  1.088827560  6      b    16     6      16 1.709167e-15 -2.416065e-15   0.6 8.008132e-17 2.248024e+00 -1.731290167  7      b    17     7      17 1.208563e-15  2.359219e-15   0.3 1.824137e-15 3.499565e-01  1.277939838  8      b    18     8      18 9.867878e-16  1.265324e-15   0.2 2.510473e-15 5.138141e-02  0.641132787  9      b    19     9      19 1.208563e-15  5.595623e-17   0.3 2.702016e-15 1.968677e-04  0.030310330 10      b    20    10      20 1.709167e-15 -1.264434e-15   0.6 2.303179e-15 6.157097e-01 -0.906060815

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