Hello everyone,

I'm running a Stata code for frailty survival model (multilevel hazard analysis) using 2018 Nigeria Demographic and Health Survey Data.

I wrote the design code using this:
svyset v021, weight(wt2_1) strata(v022), singleunit(centered) || _n, weight(wt1_1)

But when I applied the weight in the code below, it returned an error message that 'option shared() was not allowed with the svy prefix'
svy: stcox i.w_quintile i.v024 v025 poverty_prop, efron shared(v021) || v021:


Please how do I apply weight when running a multilevel hazard analysis using Cox regression (Gamma frailty model)?

Thank you.


Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input float(pid study_time) byte died int v021 byte v022 float(wt2_1 wt1_1) byte(w_quintile v024 v025) float poverty_prop
  1  13 0 1 1    401.2  2.507467 5 1 1         0
  2   9 0 1 1    401.2  2.507467 5 1 1         0
  3  17 0 1 1    401.2  2.507467 5 1 1         0
  4  31 0 1 1    401.2  2.507467 5 1 1         0
  5  39 0 1 1    401.2  2.507467 5 1 1         0
  6  22 0 1 1    401.2  2.507467 5 1 1         0
  7  24 0 1 1    401.2  2.507467 5 1 1         0
  8 .01 1 1 1    401.2  2.507467 5 1 1         0
  9  23 0 1 1    401.2  2.507467 5 1 1         0
 10  12 0 1 1    401.2  2.507467 5 1 1         0
 11   9 0 1 1    401.2  2.507467 4 1 1         0
 12  35 0 1 1    401.2  2.507467 4 1 1         0
 13  18 0 1 1    401.2  2.507467 5 1 1         0
 14  20 0 1 1    401.2  2.507467 5 1 1         0
 15  60 0 1 1    401.2  2.507467 5 1 1         0
 16  18 0 2 1    401.2  5.119411 5 1 1         0
 17   5 0 2 1    401.2  5.119411 5 1 1         0
 18  46 0 2 1    401.2  5.119411 5 1 1         0
 19  26 0 2 1    401.2  5.119411 5 1 1         0
 20  54 0 2 1    401.2  5.119411 5 1 1         0
 21  37 0 2 1    401.2  5.119411 5 1 1         0
 22  51 0 2 1    401.2  5.119411 4 1 1         0
 23  31 0 2 1    401.2  5.119411 4 1 1         0
 24  55 0 2 1    401.2  5.119411 4 1 1         0
 25  27 0 2 1    401.2  5.119411 5 1 1         0
 26  15 0 2 1    401.2  5.119411 4 1 1         0
 27  39 0 2 1    401.2  5.119411 4 1 1         0
 28   6 0 2 1    401.2  5.119411 5 1 1         0
 29  29 0 2 1    401.2  5.119411 5 1 1         0
 30 .01 1 2 1    401.2  5.119411 5 1 1         0
 31   9 0 2 1    401.2  5.119411 5 1 1         0
 32  40 0 2 1    401.2  5.119411 5 1 1         0
 33  23 0 2 1    401.2  5.119411 5 1 1         0
 34  12 0 2 1    401.2  5.119411 3 1 1         0
 35  35 0 3 1    401.2   2.40911 5 1 1         0
 36  56 0 3 1    401.2   2.40911 5 1 1         0
 37  14 0 3 1    401.2   2.40911 5 1 1         0
 38  40 0 3 1    401.2   2.40911 5 1 1         0
 39  57 0 3 1    401.2   2.40911 5 1 1         0
 40  42 0 3 1    401.2   2.40911 5 1 1         0
 41   5 0 3 1    401.2   2.40911 3 1 1         0
 42  42 0 3 1    401.2   2.40911 4 1 1         0
 43  39 0 3 1    401.2   2.40911 4 1 1         0
 44  39 0 3 1    401.2   2.40911 5 1 1         0
 45  54 0 3 1    401.2   2.40911 4 1 1         0
 46  19 0 3 1    401.2   2.40911 5 1 1         0
 47  52 0 3 1    401.2   2.40911 5 1 1         0
 48  42 0 3 1    401.2   2.40911 5 1 1         0
 49   7 0 4 1    401.2 1.0620399 5 1 1 .05263158
 50  28 0 4 1    401.2 1.0620399 5 1 1 .05263158
 51  53 0 4 1    401.2 1.0620399 5 1 1 .05263158
 52   5 1 4 1    401.2 1.0620399 5 1 1 .05263158
 53  28 0 4 1    401.2 1.0620399 5 1 1 .05263158
 54  13 0 4 1    401.2 1.0620399 5 1 1 .05263158
 55  37 0 4 1    401.2 1.0620399 5 1 1 .05263158
 56 .01 1 4 1    401.2 1.0620399 5 1 1 .05263158
 57  23 0 4 1    401.2 1.0620399 5 1 1 .05263158
 58  33 0 4 1    401.2 1.0620399 3 1 1 .05263158
 59  27 0 4 1    401.2 1.0620399 5 1 1 .05263158
 60  36 1 4 1    401.2 1.0620399 5 1 1 .05263158
 61  20 0 4 1    401.2 1.0620399 4 1 1 .05263158
 62  24 0 4 1    401.2 1.0620399 5 1 1 .05263158
 63  58 0 4 1    401.2 1.0620399 5 1 1 .05263158
 64  34 0 4 1    401.2 1.0620399 2 1 1 .05263158
 65  12 0 4 1    401.2 1.0620399 4 1 1 .05263158
 66  44 0 4 1    401.2 1.0620399 4 1 1 .05263158
 67   3 0 4 1    401.2 1.0620399 5 1 1 .05263158
 68  34 0 5 1    401.2  2.800983 3 1 1 .17391305
 69  14 0 5 1    401.2  2.800983 3 1 1 .17391305
 70   5 0 5 1    401.2  2.800983 4 1 1 .17391305
 71  10 0 5 1    401.2  2.800983 4 1 1 .17391305
 72  40 0 5 1    401.2  2.800983 4 1 1 .17391305
 73  12 0 5 1    401.2  2.800983 2 1 1 .17391305
 74  36 0 5 1    401.2  2.800983 3 1 1 .17391305
 75  19 0 5 1    401.2  2.800983 4 1 1 .17391305
 76  58 0 5 1    401.2  2.800983 3 1 1 .17391305
 77  17 0 5 1    401.2  2.800983 4 1 1 .17391305
 78  40 0 5 1    401.2  2.800983 4 1 1 .17391305
 79  39 0 5 1    401.2  2.800983 3 1 1 .17391305
 80  58 0 5 1    401.2  2.800983 3 1 1 .17391305
 81  53 0 5 1    401.2  2.800983 4 1 1 .17391305
 82  53 0 5 1    401.2  2.800983 4 1 1 .17391305
 83   1 0 5 1    401.2  2.800983 2 1 1 .17391305
 84  50 0 5 1    401.2  2.800983 2 1 1 .17391305
 85   2 0 5 1    401.2  2.800983 2 1 1 .17391305
 86  28 0 5 1    401.2  2.800983 3 1 1 .17391305
 87  24 0 5 1    401.2  2.800983 3 1 1 .17391305
 88  13 0 5 1    401.2  2.800983 5 1 1 .17391305
 89  13 0 5 1    401.2  2.800983 5 1 1 .17391305
 90  50 0 5 1    401.2  2.800983 5 1 1 .17391305
 91  46 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 92  46 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 93  19 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 94   6 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 95  32 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 96  59 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 97   9 0 6 2 631.8182 1.2421018 4 1 2 .06666667
 98  30 0 6 2 631.8182 1.2421018 3 1 2 .06666667
 99  30 0 6 2 631.8182 1.2421018 3 1 2 .06666667
100  43 0 6 2 631.8182 1.2421018 2 1 2 .06666667
end
label values v022 V022
label def V022 1 "1. nc benue urban", modify
label def V022 2 "2. nc benue rural", modify
label values w_quintile w_quintile
label def w_quintile 2 "2. Second", modify
label def w_quintile 3 "3. Middle", modify
label def w_quintile 4 "4. Fourth", modify
label def w_quintile 5 "5. Highest", modify
label values v024 V024
label def V024 1 "1. north central", modify
label values v025 V025
label def V025 1 "1. urban", modify
label def V025 2 "2. rural", modify
------------------ copy up to and including the previous line ------------------