Hello,

In my fixed effect model with the effect of parenting styles (categorial) on problemativ behaviour (metric), not every specification of the categorial variable is shown.
Parenting styles have 4 categories, but the output of my FEM only shows 3 of them and I have no idea why this is the case.
Do you have any idea why I'm only seeing 3 out of 4 categories of the variable parenting styles?

Regression output:
(Std. Err. adjusted for 77 clusters in id)
-------------------------------------------------------------------------------
| Robust
conduct_paco | Coef. Std. Err. t P>|t| [95% Conf. Interval]
--------------+----------------------------------------------------------------
erziehungss~e |
Autoritär | .0460064 .0334382 1.38 0.173 -.0205916 .1126044
Vernachläs~d | .0882347 .0440646 2.00 0.049 .0004724 .1759971
Verwöhnend | -.0048964 .0308254 -0.16 0.874 -.0662905 .0564977
|
_cons | .2840729 .0193521 14.68 0.000 .2455298 .322616
--------------+----------------------------------------------------------------
sigma_u | .18830684
sigma_e | .19903259
rho | .47233038 (fraction of variance due to u_i)
-------------------------------------------------------------------------------


Command:
xtset cid wave
xtreg conduct_paco i.erziehungsstile, fe vce(cluster id)

Here is my data used for the command above
Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input long(id cid) int wave float(erziehungsstile conduct_paco)
  111000   111203  2 1  .2
  111000   111203  3 4  .8
  111000   111203  4 3 1.2
  111000   111203  5 4   1
  111000   111203  6 4  .8
  111000   111203  7 1  .5
  111000   111203  8 4  .2
  111000   111203  9 3   0
 4858000  4858201  4 1   0
 4858000  4858201  5 1  .2
 4858000  4858201  6 2  .4
 4858000  4858201  7 1 1.2
 4858000  4858201  8 1  .8
 4858000  4858201  9 4  .8
 4858000  4858201 10 1  .6
 4858000  4858201 11 1  .6
 8948000  8948201  2 1   0
 8948000  8948201  3 1  .2
 8948000  8948201  4 1  .2
 8948000  8948201  5 1  .2
 8948000  8948201  6 1  .2
 8948000  8948201  7 4  .4
 8948000  8948201  8 4  .2
 8948000  8948201  9 2  .8
11295000 11295201  4 1  .2
11295000 11295201  5 4  .2
11295000 11295201  6 1  .6
11295000 11295201  7 1  .2
11295000 11295201  8 1 .25
11295000 11295201  9 4  .2
11295000 11295201 10 4   0
11295000 11295201 11 1   0
19673000 19673201  2 3   0
19673000 19673201  3 4  .2
19673000 19673201  4 4  .2
19673000 19673201  5 3  .2
19673000 19673201  6 4  .2
19673000 19673201  7 3  .2
19673000 19673201  8 4  .2
19673000 19673201  9 3   0
35026000 35026203  3 3  .8
35026000 35026203  4 3  .6
35026000 35026203  5 3  .6
35026000 35026203  6 3  .4
35026000 35026203  7 3  .6
35026000 35026203  8 3  .6
35026000 35026203  9 3  .2
35026000 35026203 10 3  .4
45091000 45091202  2 1  .4
45091000 45091202  3 1  .8
45091000 45091202  4 1   0
45091000 45091202  5 1   0
45091000 45091202  6 1   0
45091000 45091202  7 1  .4
45091000 45091202  8 1  .4
45091000 45091202  9 4   0
55124000 55124201  4 1  .2
55124000 55124201  5 1  .6
55124000 55124201  6 1  .2
55124000 55124201  7 1  .2
55124000 55124201  8 1  .4
55124000 55124201  9 2  .6
55124000 55124201 10 2  .6
55124000 55124201 11 3   1
61002000 61002202  3 2  .4
61002000 61002202  4 1  .4
61002000 61002202  5 1  .2
61002000 61002202  6 3  .4
61002000 61002202  7 2  .2
61002000 61002202  8 2  .2
61002000 61002202  9 3  .2
61002000 61002202 10 3  .2
61002000 61002203  3 2  .4
61002000 61002203  4 3  .2
61002000 61002203  5 1  .2
61002000 61002203  6 3  .4
61002000 61002203  7 2  .2
61002000 61002203  8 2  .2
61002000 61002203  9 3  .2
61002000 61002203 10 3  .2
73923000 73923202  2 1   0
73923000 73923202  3 1   0
73923000 73923202  4 1   0
73923000 73923202  5 1   0
73923000 73923202  6 1  .2
73923000 73923202  7 1  .2
73923000 73923202  8 1   0
73923000 73923202  9 3  .4
80857000 80857202  3 1   0
80857000 80857202  4 1  .2
80857000 80857202  5 1  .2
80857000 80857202  6 1   0
80857000 80857202  7 1  .2
80857000 80857202  8 1   1
80857000 80857202  9 4  .8
80857000 80857202 10 1  .6
86889000 86889201  2 1  .2
86889000 86889201  3 1   0
86889000 86889201  4 1  .6
86889000 86889201  5 1  .2
end
label values wave WAVE_prt2
label def WAVE_prt2 2 "2 2009/10", modify
label def WAVE_prt2 3 "3 2010/11", modify
label def WAVE_prt2 4 "4 2011/12", modify
label def WAVE_prt2 5 "5 2012/13", modify
label def WAVE_prt2 6 "6 2013/14", modify
label def WAVE_prt2 7 "7 2014/15", modify
label def WAVE_prt2 8 "8 2015/16", modify
label def WAVE_prt2 9 "9 2016/17", modify
label def WAVE_prt2 10 "10 2017/18", modify
label def WAVE_prt2 11 "11 2018/19", modify
label values erziehungsstile erziehungsstile
label def erziehungsstile 1 "Autoritativ", modify
label def erziehungsstile 2 "Autoritär", modify
label def erziehungsstile 3 "Vernachlässigend", modify
label def erziehungsstile 4 "Verwöhnend", modify
label values conduct_paco conduct_paco
label def conduct_paco 0 "0 niedrig", modify