time-series

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Finding the date of a data point in a R time-series

I make a time series: 开发者_如何学编程t = ts(rnorm(12*50), start=1900, freq=12) and then find the maximum with max(t). Is there any convenient way to find out what date this maximum occurred at?T[详细]

2023-03-31 14:12 分类：问答
Transaction activity running total in SQL

I am working with a transactions table. I want to generate a number 开发者_开发技巧of variables to determine the number of transactions performed by the same customer in the last 5 and 30 minutes and[详细]

2023-03-31 13:40 分类：问答
"non-stationary seasonal AR part from CSS" error in R

I am trying to fit ARIMA model of a seasonally decomposed series. But when I try to execure following:[详细]

2023-03-31 07:41 分类：问答
How do I calculate a median-to-date variable using Oracle SQL?

I\'m working with invoice data in Oracle SQL. I want to create a variable, \"median account invoice amount to date\", that gives the median invoice amount for an acco开发者_开发百科unt up to that give[详细]

2023-03-31 01:52 分类：问答
Does there exist runPercentRank like runFun (runMin, runMax,...) in TTR or how to write one?

I am looking for percent rank function in R but can not find it. Actually I am interested in runPercentRank function like the ones in TTR package under runFun (runMin, runMax,...). The function would[详细]

2023-03-30 07:35 分类：问答
R: merge two irregular time series

I have two multivariate time series x and y, both covering approximately the same range in time (one starts two years before the other, but they end on the same date). Both series have missing observa[详细]

2023-03-29 03:24 分类：问答
How to get years from a time series index when the underlying time series is of monthly freq?

I´d like to extract years from a time series index (the underlying time series is of monthly frequency). The reason I want to do it is creating a yearly axis, e.g.[详细]

2023-03-27 04:57 分类：问答
User-selected marker in time series data in Java

My code plots 5000 points of time series data in a panel that is 581 pixels wide by default, but this width changes when the user resizes the window.My code also plots several rectangular markers that[详细]

2023-03-27 02:37 分类：问答
R: Reversing the data in a time series object

I figured out a way to backcast (ie. predicting the past) with a time series. Now I\'m just struggling with the programming in R.[详细]

2023-03-26 17:57 分类：问答
how to find interesting points in time series

i have an array of date=>values, like this \"2010-10-12 14:58:36\" =>13.4 \"2010-10-17 14:58:36\" =>12[详细]

2023-03-26 10:46 分类：问答