0
我有DF看起来像这样集团的数据,并计算平均值,SD
options(scipen=999)
df = data.frame(imei = c(35745407328, 35745407328, 35745407328,
35745407328, 35745407328, 35745407328,
35745407328, 35745407328, 35745407328,
35745407328, 35745407328, 35745407328),
ign = c("Off", "Off", "Off", "On",
"On", "Off", "Off", "On",
"On", "On", "On", "On"),
unixTime = c(1514313014000, 1514313074000, 1514313134000, 1514313194000,
1514313254000, 1514313314000, 1514313374000, 1514313434000,
1514313494000, 1514313554000, 1514313614000, 1514313674000))
DF
----------------------------------
imei ign unixTime
----------------------------------
35745407328 Off 1514313014000
----------------------------------
35745407328 Off 1514313074000
----------------------------------
35745407328 Off 1514313134000
----------------------------------
35745407328 On 1514313194000
----------------------------------
35745407328 On 1514313254000
----------------------------------
35745407328 Off 1514313314000
----------------------------------
35745407328 Off 1514313374000
----------------------------------
35745407328 On 1514313434000
----------------------------------
35745407328 On 1514313494000
----------------------------------
35745407328 On 1514313554000
----------------------------------
35745407328 On 1514313614000
----------------------------------
35745407328 On 1514313674000
----------------------------------
我希望将基于“IGN”上面的数据,然后
我想计算平均值,即unixTime的标准偏差。
而基于组差异的第一和最后一个值unixTime
的 分组基于这意味着,SD和差异将被计算
----------------------------------
imei ign unixTime
----------------------------------
35745407328 Off 1514313014000
----------------------------------
35745407328 Off 1514313074000
----------------------------------
35745407328 Off 1514313134000
----------------------------------
----------------------------------
35745407328 On 1514313194000
----------------------------------
35745407328 On 1514313254000
----------------------------------
----------------------------------
35745407328 Off 1514313314000
----------------------------------
35745407328 Off 1514313374000
----------------------------------
----------------------------------
35745407328 On 1514313434000
----------------------------------
35745407328 On 1514313494000
----------------------------------
35745407328 On 1514313554000
----------------------------------
35745407328 On 1514313614000
----------------------------------
35745407328 On 1514313674000
----------------------------------
请帮我这个
如果答案已经可用。请给我提供链接。谢谢