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model_misuse.do
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model_misuse.do
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*** Substance misuse
/* PREAMBLE */
global dir "`c(pwd)'"
*global dir "C:/Users/dy21108/OneDrive - University of Bristol/Documents/GitHub/lockdown-and-vulnerable-groups"
/* SETUP DATA */
*Get Covid weekly case counts;
import delimited using "$dir/output/CovidNewCaseCounts.csv", clear
save "$dir/output/CovidNewCaseCounts.dta", replace
*Get CSV
import delimited using "$dir/output/measure_misuse_rate.csv", clear
*Set up time variables
generate date2 = date(date, "YMD")
format %td date2
gen week_date=date2
format %tw week_date
gen period = 0 /*pre-lockdown period */
replace period = 1 if date2>=d(23mar2020) /*start of first lockdown*/
replace period = 2 if date2>=d(13may2020) /*beginning of inter lockdown period */
replace period = 3 if date2>=d(05nov2020) /*start of second/third lockdown period */
replace period = 4 if date2>=d(29mar2021) /*beginning of transition out of third lockdown */
sort date2
gen year = year(date2)
gen month = month(date2)
gen week = week(date2)
gen time = 0
replace time = week - 63.5 if year==2019
replace time = week - 11.5 if year==2020
replace time = week + 40.5 if year==2021
sort misuse time
by misuse: gen trperiod=_n
*define interaction terms as per the itsa function
gen _z=misuse
gen _t=trperiod
gen _z_t=_z*trperiod
gen _x30=period
replace _x30=1 if period>=1
gen _x_t30=_x30*(_t-30)
gen _z_x30=_z*_x30
gen _z_x_t30=_z_x30*(_t-30)
gen _x37=0
replace _x37=1 if period>=2
gen _x_t37=_x37*(_t-37)
gen _z_x37=_z*_x37
gen _z_x_t37=_z_x37*(_t-37)
gen _x62=0
replace _x62=1 if period>=3
gen _x_t62=_x62*(_t-62)
gen _z_x62=_z*_x62
gen _z_x_t62=_z_x62*(_t-62)
gen _x83=0
replace _x83=1 if period>=4
gen _x_t83=_x83*(_t-83)
gen _z_x83=_z*_x83
gen _z_x_t83=_z_x83*(_t-83)
*Indicator variables for public holidays
gen xmas=0
replace xmas=1 if date2==d(23dec2019)
replace xmas=1 if date2==d(21dec2020)
replace xmas=1 if date2==d(20dec2021)
gen ny=0
replace ny=1 if date2==d(30dec2019)
replace ny=1 if date2==d(28dec2020)
replace ny=1 if date2==d(27dec2021)
gen easter=0
replace easter=1 if date2==d(06apr2020)
replace easter=1 if date2==d(13apr2020)
replace easter=1 if date2==d(29mar2021)
replace easter=1 if date2==d(05apr2021)
gen pubhol=0
replace pubhol=1 if date2==d(04may2020)
replace pubhol=1 if date2==d(25may2020)
replace pubhol=1 if date2==d(31aug2020)
replace pubhol=1 if date2==d(03may2021)
replace pubhol=1 if date2==d(31may2021)
replace pubhol=1 if date2==d(30aug2021)
gen population2=population
replace population2=2380 if _z==1
*Merge on covid case counts
merge m:1 trperiod using "$dir/output/CovidNewCaseCounts.dta"
replace newcases=0 if newcases==.
export delimited using "$dir/output/check.csv", replace
/*** CITS model for first lockdown ***/
preserve
drop if _t>61
* run NegBin model using variables defined above: z=group x=period(pre/post) t=time
xi: glm consultations newcases i.month xmas ny easter pubhol _t _z _z_t _x30 _x_t30 _z_x30 _z_x_t30 _x37 _x_t37 _z_x37 _z_x_t37, family(poisson) link(log) exposure(population2) vce(robust)
xi: glm consultations newcases i.month xmas ny easter pubhol _t _z _z_t _x30 _x_t30 _z_x30 _z_x_t30 _x37 _x_t37 _z_x37 _z_x_t37, family(nb) link(log) exposure(population) vce(robust)
* plot observed and predicted values
predict misuse_yhat
gen misuse_pred_rate=misuse_yhat/population
graph twoway (line misuse_pred_rate time if _z==1, lcolor(black)) (line misuse_pred_rate time if _z==0, lcolor(gray)) (scatter value time if _z==1, mcolor(black) msymbol(o)) (scatter value time if _z==0, mcolor(gray) msymbol(o)), legend(order(1 "Intervention estimate" 2 "Control estimate" 3 "Intervention rates" 4 "Control rates")) xline(0, lcolor(black) lpattern(dash)) xline(8, lcolor(black) lpattern(dash)) xscale(range(-30 32)) xlabel(-30 -20 -10 0 10 20 30) yscale(range(0 0.5))
graph export "$dir/output/misuse_plot1.pdf", as(pdf) replace
restore
/*** CITS model for second and thrid lockdowns ***/
drop if date2<d(11may2020)|date2>d(20sep2021)
* run NegBin model using variables defined above: z=group x=period(pre/post) t=time
xi: glm consultations newcases i.month xmas ny easter pubhol _t _z _z_t _x62 _x_t62 _z_x62 _z_x_t62 _x83 _x_t83 _z_x83 _z_x_t83, family(poisson) link(log) exposure(population) vce(robust)
xi: glm consultations newcases i.month xmas ny easter pubhol _t _z _z_t _x62 _x_t62 _z_x62 _z_x_t62 _x83 _x_t83 _z_x83 _z_x_t83, family(nb) link(log) exposure(population) vce(robust)
* plot observed and predicted values
predict misuse_yhat2
gen misuse_pred_rate2=misuse_yhat2/population
graph twoway (line misuse_pred_rate2 time if _z==1, lcolor(black)) (line misuse_pred_rate2 time if _z==0, lcolor(gray)) (scatter value time if _z==1, mcolor(black) msymbol(o)) (scatter value time if _z==0, mcolor(gray) msymbol(o)), legend(order(1 "Intervention estimate" 2 "Control estimate" 3 "Intervention rates" 4 "Control rates")) xline(33, lcolor(black) lpattern(dash)) xline(54, lcolor(black) lpattern(dash)) xscale(range(8 79)) xlabel(10 20 30 40 50 60 70 80) yscale(range(0 0.5))
graph export "$dir/output/misuse_plot2.pdf", as(pdf) replace