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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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Linear regression with time series data

I am trying to draw a visualization showing some trend over time. In my line plot, I have date as the X variable, some other number as the Y variable. I used d3.time scale for x and d3.linear scale for Y. The line plot is fine. Then I tried to draw…
www123
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error in stl .series is not periodic

I am pretty sure I am missing something which is very simple but still not able to figure out why this error is showing up . The data I have is of every month end data from 2013 Apr to 2014 Mar. Now I want to understand the trend over the 12 months…
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Real-time trending algorithm

I'm developing a system that has to return the most trending 'articles' in real time based on the no. of hits that article has. My first thought was storing for each article the no. of hits vs. time. Then I would normalize this function, and…
Carlos Navarro Astiasarán
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Trying to identify breakpoints in Landsat imagery - why does BFAST miss obvious breaks?

I have a stack of 300+ landsat NDVI images. I am using the BFAST package in R to identify breakpoints. The breaks are often hugely obvious as you can see from this image: Note how there is a huge dip in NDVI around 1988 followed by a gradual…
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How to find woeid (where on earth id) of a country

I am trying to test Twitter API and find trends in a country. How can I find the WOEID (WHERE ON EARTH IDENTIFIER) for a specific country? I tried looking on Google but could not find a list. If there is any program in Python that provides WOEID…
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Simple trend analysis algorithm

OK, so you have some historic data in the form of [say] an array of integers. This, for example, could represent free-space on a server HDD over a two-year period, with each array element representing a daily sample. The data (free-space in this…
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Time Trend Variable in Balanced Panel Data, Stata

I have some balanced panel data and want to include trend variable into my regression. However, I have 60 districts in 7 year time period and I am not sure how to include trend variable. Year variable is repetitive as expected and for 2005-2011. I…
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Is there a linear trend in data?

I am having a continuously incoming data represented by an array of integer x = [x1,...,xn], n<1 000 000. Each two elements satisfy the following condition x[i] < x[i + 1]. I need to detected as fast as possible such a breakpoint, where the linear…
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TypeError: seasonal_decompose() got an unexpected keyword argument 'period'

I'm trying to digest time series data with datetime index. I'm going to use period in my project, but it gives me an error saying there is no argument named period. I couldn't find anything for that. But I see that the interval is mentioned on the…
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How to enter an array of non-adjacent cells as first argument in trend function?

I want to find the value for A3. __|_A___ 1 | 5 2 | 10 3 | blank 4 | 20 So in A3 I add this: =trend( {A1,A2,A4} , {1,2,4} , {3} ) That produces an error.
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Detrending a nonlinear signal (Python)

I have a signal that consists of samples stamped in micro seconds. The signal's frequency is 200Hz. In time, the signal looks like this: and spectrum (using Fourier transform) looks like this (the figure shows spectrum up to 3000Hz, for…
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How to find my time series is additive or multiplicative only using statistical test in python?

I am trying to find whether my time series is additive or multiplicative I tried two-approach If the variance is high and varying with time i.e. high variability then the series is multiplicative or else its additive, but confused should it be on…
rinki nag
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How can I create a Trend Line in Amazon QuickSight?

I need to create a Trend calculation for a dashboard in Amazon QuickSight. Basically I need the same thing that the Trend function in Excel allows. Thanks!
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Plotting a trendline with D3 - Actual & Forecast

I have a multi-series line chart with a trend line for each series. My data is formatted as such that the first half is actual data and the second is forecast (predicted) data. So for the first 32 weeks, I have real data and then those fields go to…
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R Calculating Trend of each day over several years

I want to calculate the trend of each day over several years. For example the trend of May 1st from 2000 to 2010. Here is my test-dataframe: library(lubridate) date_list = seq(ymd('2000-01-15'),ymd('2010-09-18'),by='day') testframe = data.frame(Date…
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