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Questions tagged [trend]

A trend is the general drift or tendency in a set of data.

Trend in math is a mathematical tool used to show a pattern in the occurrence of data. An example would be; if a set of numbers in any given data increases and the values of the other set of numbers increases, then they are said to have a positive trend and vice versa. If the data shows no relation then the set shows no trend.

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Better algorithmic approach to showing trends of data per week

Suppose I have a list of projects with start date and end date. I also have a range of weeks, which varies (could be over months, years, etc) I would like to display a graph showing 4 values per week: projects started projects closed total…
Bizmarck
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Using dates in R for Theil-Sen

I am trying to use dates as my X variable in a Theil-Sen slope estimation and I am having difficulty using the R package zyp library(zyp) myDates <- as.Date(c("2009-11-24","2009-12-03","2010-01-19","2010-02-18","2010-03-04")) myData <-…
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Excel - Calculate the missing values using linear trend

Say i have a book where there is data in A1:B9. A1:B9 has the values 1 though to 9. B1 contains the value 10 and B9 contains the value 60. See beloq Is there a way to calculate what the values in between would be, assuming they fit on the line of…
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R - Trend estimation for short time series

I have very short time series of data from a climatic experiment that I did back in 2012. The data consists of daily water solution flux and daily CO2 flux data. The CO2 flux data comprises 52 days and the water solution flux data is only 7 days…
Strohmi
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Filtering an Excel pivot table?

Let me first very quickly explain my project: For work I sent out a survey to 30 organizations in each state plus DC. It is a 5 question, multiple choice survey (A, B, and C). I've set up an excel sheet that has all of the organizations in column…
user3700427
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Replicating Excel Trend Formula in SQL (w/ sample data)

I am converting an Excel based forecasting workbook into a SQL stored procedure. I am having difficulty converting 2 dependent Excel tables because they use a prior rolling time period value to calculate future weeks. I'm not sure how to reference a…
user3466096
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What algorithm can be used for alerting unusual trends?

I am looking for an algorithm to detect when a stream of data is showing an usual trend. For example: You are logging your bookings, and over the last couple of weeks they have been stable with the usual ups and downs. But suddenly your payment…
Overbryd
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How do I get endpoints of a trendline?

I am using this logic: MYSQL Trendline calculation to calculate the slope of a set of time-series data. But my data is such (measuring current output over time) that the 'slope' makes no sense as it is dependent on the relative scale of the axes.…
Doug Wolfgram
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TeeChart Pro 2014 for delphi 2007 Trend with barseries

I'm using a TDBChart to display 3 barseries of the data. Can you point me to a good example of adding a trend line to each barseries? The example that comes with TeeChart download is not at all helpful. Thanks
user3379994
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JavaPlot: How can I use the fit method of GNUPlot?

I have a set of 6 points. Now I want to create a trend line (fifth-degree polynomial). I don't have much experience with GNUPlot, yet, but I found the "fit" method which should do exactly what I want. The problem is that I don't know how to call the…
John
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Heroku sending outgoing email: IPs in DUL and blocked by Trend micro

We currently need some help setting up email sending from one of our Rails apps via our own Microsoft Exchange SMTP server. It seems that the Heroku IPs are blocked by Trend Micro. We are having this message: "Your email messages have been blocked…
Long
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Detecting trends in a data stream in real-time

I'm trying to detect trending topics on Twitter in real-time. What I'm doing is every time I get a tweet I assign the tweet to the cluster that talks about the same topic as the tweet. Regardless of the clustering algorithm I'm using or how I'm…
Jack Twain
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Generate Equation from 3D surf Plot in Matlab

I am wondering if anyone knows (or is it possible?) how to generate a trend equation from a 3D surf plot from Matlab? I understand that we can create trendline for 2D plots (linear and nonlinear) and show its equation, but how about 3D plot? Can we…
kit
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How can I get google trend result by city or state?

I am using http://www.google.com/trends/hottrends/atom/hourly //for us http://www.google.co.in/trends/hottrends/atom/hourly //for india These are providing result by country this working fine but I want to get result by city or state can…
user1246726
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Time series analysis with seasonality. Any such statistical/machine learning java library available?

I need a forecasting model that will use time series as well as seasonality. Example, to predict Feb 2013 data, I will use Jan 2013 data and Feb 2012 data. I was trying to assess TripleExponentialSmoothing and SVM (as used in the Weka forecasting…
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