R:按名称显示过去365天窗口内的RunningTotal

Question

这是我的数据的样子。最右边的列是我的Desired column。

Name  EventType  EventDate  SalesAmount RunningTotal Runningtotal(prior365Days)
John    Email      1/1/2014      0          0            0
John    Sale       2/1/2014     10          10           10
John    Sale       7/1/2014     20          30           30
John    Sale       4/1/2015     30          60           50 
John    Webinar    5/1/2015      0          60           50
Tom     Email      1/1/2014      0          0            0
Tom     Sale       2/1/2014     15          15           15
Tom     Sale       7/1/2014     10          25           25
Tom     Sale       4/1/2015     25          50           35 
Tom     Webinar    5/1/2015      0          50           35

我只是想在过去365天的窗口中获得每个名称的SalesAmount的运行总数。对于一般的"RunningTotal"列，我使用:

df<- df%>%
   group_by (Name)%>%
    mutate(RunningTotal = cumsum(SalesAmount))

但是我不知道如何获得过去365天窗口内的运行总数。请帮助。衷心感谢您的帮助!

Answer 1

df$EventDate <- as.Date(df$EventDate, format="%d/%m/%Y")
df <- df %>%
   group_by (Name) %>%
   arrange(EventDate) %>% 
   mutate(day = EventDate - EventDate[1])
f <- Vectorize(function(i)
    sum(df[df$Name[i] == df$Name & df$day[i] - df$day >= 0 & 
             df$day[i] - df$day <= 365, "SalesAmount"]), vec="i")
df$RunningTotal365 <- f(1:nrow(df))