Bootsrapping using calculation formula

[Fredrick orwa]

Dear Colleagues,
Can someone tell me why my code is note producing intervals (CI) when I do bootstrap: Below is my code and output

**Directory changing
cd "/Users/fodiwuor/OneDrive - Kemri Wellcome Trust/fodiwuor/studies/Pneumox/PneumoX2/CleanedBatchesTo_be_merged_Pneumoxdb"

**program
cap program drop _all
program sen1, rclass
version 15.1
local R=0.875
local R1=0.7104
local Q=0.3077
tempvar nt
gen `nt'=(`R'*`Q')+(`R1'*(1-`Q'))
local d=(`R'*`Q')+(`R1'*(1-`Q'))
return scalar SEN1=`d'
end

bootstrap r(SEN1),reps(1000) seed (4) size(83): sen1





Bootstrap results Number of obs = 83
Replications = 1,000

command: sen1
_bs_1: r(SEN1)

------------------------------------------------------------------------------
| Observed Bootstrap Normal-based
| Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
_bs_1 | .7610474 . . . . .
------------------------------------------------------------------------------

[Joseph Coveney]

Can someone tell me why my code is note producing intervals (CI) when I do bootstrap

Because you're returning a constant.

. . .
local R=0.875
local R1=0.7104
local Q=0.3077
. . .
local d=(`R'*`Q')+(`R1'*(1-`Q'))
return scalar SEN1=`d'