I want to do this code in Julia, is there any way to achieve it? Thank you for your help!

If I understand your screenshot correctly itβs something like this (slightly hacky way of accessing the group name, thereβs probably a better way):

```
julia> using DataFrames, GLM
julia> df = DataFrame(G = rand('A':'D', 50), x1 = randn(50), y = randn(50));
julia> [(first(first(gdf).G), coef(lm(@formula(y ~ x1), gdf))) for gdf β groupby(df, :G)]
4-element Vector{Tuple{Char, Vector{Float64}}}:
('D', [0.2590468147076215, 0.18017049456177228])
('B', [0.06914829093952116, 0.8148962459039837])
('C', [-0.20806955860375123, 0.15624480441068453])
('A', [-0.19031169433664966, 0.0535534286170727])
```

although note that this is the same as just interacting `x1`

and the group indicator (allowing a different slope and intercept per group):

```
ulia> lm(@formula(y ~ x1*G), df)
StatsModels.TableRegressionModel{LinearModel{GLM.LmResp{Vector{Float64}}, GLM.DensePredChol{Float64, LinearAlgebra.CholeskyPivoted{Float64, Matrix{Float64}}}}, Matrix{Float64}}
y ~ 1 + x1 + G + x1 & G
Coefficients:
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Coef. Std. Error t Pr(>|t|) Lower 95% Upper 95%
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
(Intercept) -0.190312 0.328665 -0.58 0.5657 -0.853585 0.472961
x1 0.0535534 0.284165 0.19 0.8514 -0.519915 0.627022
G: B 0.25946 0.424046 0.61 0.5439 -0.5963 1.11522
G: C -0.0177579 0.456611 -0.04 0.9692 -0.939235 0.90372
G: D 0.449359 0.429051 1.05 0.3009 -0.416501 1.31522
x1 & G: B 0.761343 0.48832 1.56 0.1265 -0.224127 1.74681
x1 & G: C 0.102691 0.401754 0.26 0.7995 -0.708082 0.913464
x1 & G: D 0.126617 0.362336 0.35 0.7285 -0.604606 0.85784
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
```

(here `A`

is the base category, so intercept and `x1`

coefficient are the same as for `A`

above, and e.g. `B`

's intercept is given by -0.19+0.259 = 0.069 and slope by 0.05 + 0.76 = 0.81)

For the future, donβt screenshot text, paste it. Easier to read, copy-and-run, search and quote. If that seems like extra work for you, consider that you are expecting people to help *you*, and putting in the extra effort increases the chance someone will.

Thank you sooooo much!!!

really helps me a lot

have a great day!

got it, thanks man