Replace observations with missing values (dot)

[Ana Vasconcelos]

I have a dataset where I have two variables ("ff_jbstat" and "ethn_dv") in a likert scale. Some on the answer are not labeled, namely: in "ff_jbstat" there is an answer named "11" and in the variable "ethn_dv" tehre is an answer named "56". Can you help me with the code to replace those observations with a missing value (dot)?
I send an exmaple of the dataset below.
Thank you in advance

* Example generated by -dataex-. For more info, type help dataex
clear
input byte(hgpart ff_jbstat ethn_dv)
. 3  1
2 4  1
1 3  1
2 2  1
1 2  1
. 2  1
2 4 11
1 2  1
. .  1
2 2  1
. 2  1
. 4  1
. 8  1
. 3  4
2 2  1
1 6  7
2 2  1
1 .  1
. 1  4
2 6 10
1 2 10
. . 14
. 2  1
2 3  1
1 2  5
. 2  1
. 4  4
2 2  1
1 2 12
. 2  1
2 2  4
. 1 97
. 1  1
2 4  1
1 4  1
. 2 14
. 7 10
7 1 10
2 2  9
1 2  9
. 2  9
. 7  9
. 7  9
2 1 10
1 6 10
1 6 10
2 . 10
. 4 14
. 1  7
. 3  8
. .  5
2 1 10
1 2  1
2 2 13
1 2  1
. 2 13
. 2 13
2 2  5
1 2  1
2 6  9
. 1 97
. 7 11
2 2 12
1 2  4
. 7 11
. . 11
. 7 12
. 1  5
. 2 15
2 2 14
. 2 14
1 6 10
. 2 10
. 7 10
. . 10
. 1 14
. 4  8
1 1 15
. 2 12
. 2 13
2 1  9
1 2  9
. 7  9
. 4 97
2 2 15
1 2 15
. 7 15
. 3  6
2 3 10
. 7 10
. 7 10
1 2 13
2 2 11
1 1 11
. 2 15
. 2 14
. 2  1
. 2  8
2 3  9
2 2 16
end
label values hgpart c_hgpart
label values ff_jbstat c_ff_jbstat
label def c_ff_jbstat 1 "self employed", modify
label def c_ff_jbstat 2 "in paid employment (full or part-time)", modify
label def c_ff_jbstat 3 "unemployed", modify
label def c_ff_jbstat 4 "retired", modify
label def c_ff_jbstat 6 "looking after family or home", modify
label def c_ff_jbstat 7 "full-time student", modify
label def c_ff_jbstat 8 "long-term sick or disabled", modify
label values ethn_dv c_ethn_dv
label def c_ethn_dv 1 "british/english/scottish/welsh/northern irish", modify
label def c_ethn_dv 4 "any other white background", modify
label def c_ethn_dv 5 "white and black caribbean", modify
label def c_ethn_dv 6 "white and black african", modify
label def c_ethn_dv 7 "white and asian", modify
label def c_ethn_dv 8 "any other mixed background", modify
label def c_ethn_dv 9 "indian", modify
label def c_ethn_dv 10 "pakistani", modify
label def c_ethn_dv 11 "bangladeshi", modify
label def c_ethn_dv 12 "chinese", modify
label def c_ethn_dv 13 "any other asian background", modify
label def c_ethn_dv 14 "caribbean", modify
label def c_ethn_dv 15 "african", modify
label def c_ethn_dv 16 "any other black background", modify
label def c_ethn_dv 97 "any other ethnic group", modify

[Hemanshu Kumar]

Try this:

local vars ff_jbstat ethn_dv

foreach var of varlist `vars' {
    decode `var', gen(_`var')
    replace `var' = . if !missing(`var') & missing(_`var')
    drop _`var'
}

[Ana Vasconcelos]

It worked! Thank you very much