Created
September 24, 2016 17:27
-
-
Save IronistM/811b754b8e2f4b88d7635e34dcdfa329 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# *-------------------------------------------------------------------- | |
#Adstock functions | |
adstock_calc_1<-function(media_var,dec,dim){ | |
length<-length(media_var) | |
adstock<-rep(0,length) | |
for(i in 2:length){ | |
adstock[i]<-(1-exp(-media_var[i]/dim)+dec*adstock[i-1]) | |
} | |
adstock | |
} | |
adstock_calc_2<-function(media_var,dec,dim){ | |
length<-length(media_var) | |
adstock<-rep(0,length) | |
for(i in 2:length){ | |
adstock[i]<-1-exp(-(media_var[i]+dec*media_var[i-1])/dim) | |
} | |
adstock | |
} | |
#Function for creating test sets | |
create_test_sets<-function(base_p, trend_p, season_p, ad_p, dim, dec, adstock_form, error_std){ | |
#National level model | |
#Five years of weekly data | |
week<-1:(5*52) | |
#Base sales of base_p units | |
base<-rep(base_p,5*52) | |
#Trend of trend_p extra units per week | |
trend<-trend_p*week | |
#Winter is season_p*10 units below, summer is season_p*10 units above | |
temp<-10*sin(week*3.14/26) | |
seasonality<-season_p*temp | |
#7 TV campaigns. Carry over is dec, theta is dim, beta is ad_p, | |
tv_grps<-rep(0,5*52) | |
tv_grps[20:25]<-c(390,250,100,80,120,60) | |
tv_grps[60:65]<-c(250,220,100,100,120,120) | |
tv_grps[100:103]<-c(100,80,60,100) | |
tv_grps[150:155]<-c(500,200,200,100,120,120) | |
tv_grps[200:205]<-c(250,120,200,100,120,120) | |
tv_grps[220:223]<-c(100,100,80,60) | |
tv_grps[240:245]<-c(350,290,100,100,120,120) | |
if (adstock_form==2){adstock<-adstock_calc_2(tv_grps, dec, dim)} | |
else {adstock<-adstock_calc_1(tv_grps, dec, dim)} | |
TV<-ad_p*adstock | |
#Error has a std of error_var | |
error<-rnorm(5*52, mean=0, sd=error_std) | |
#Full series | |
sales<-base+trend+seasonality+TV+error | |
#Plot | |
#plot(sales, type='l', ylim=c(0,1200)) | |
output<-data.frame(sales, temp, tv_grps, week, adstock) | |
output | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment