Questions tagged [aggregation]

Refers to "lumping together" potentially inhomogeneous groups of data.

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Aggregation Estimation Issues

I'm analyzing the effect of a law enforcement measure over time on reported violence for districts in a city. If I consider the city as a whole I have access to a lot of possible control variables (e....
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27 views

Looking for R's way of doing Stata's svy tabulate with “tab” argument [closed]

Stata's svy command allows to get standard error estimates from two way contingency tables and the tab(varname) option makes it ...
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19 views

How to use weight variables within aggregated results, for group proportions

If I have the following data, where each row represents and individual response, how would I go about reporting the proportions of different groups? (here the groups are ...
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28 views

Explain Dempster Shafer Equation

I have a question about the Dempster Shafer theory application. I have four models where the output is of abstract level (crisp). I understand I have to use the confusion matrix (precision/recall) to ...
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17 views

How to aggregate multiple MAF files together for analysis?

I have cancer genomic data (tumor/normal whole exome sequencing) from 50 patients that received the same type of treatment, half of whom responded. These come in the form of 50 .maf files, along with ...
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Creating a fraud score for an image fraud detection workflow

So to set the context. I'm working on an image fraud detection workflow for an insurance company. The idea basically is: There are a number of cases (car accidents). Each case contains a set of ...
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6 views

Choosing the best data aggregation function for downsampling over variable collected over an irregular time series

I was hoping that you can provide me with some expert advice concerning the problem described in title. I have a time series of tweets that contains sentiment values with range (0,1) in which I am ...
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15 views

can i aggregate 3 conditions into 1? What test to use? & unequal data

I've run an experiment with 2 independent variables and I need some advice for what the best form of statistical test to use is, and whether one of the IVs is even possible to do. IV1: between-...
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10 views

How to avoid bucketing in creating time series data with specific characteristics

Based on a dataset containing the sell prices of a house, along with its characteristics (such as nr of bedrooms, living space, etc), I would like to forecast housing prices one year ahead in the ...
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21 views

Calculating estimates of aggregate totals from percentile data

I'm working with wage data and would like to compute total aggregate wages earned for individual job classifications. The survey data I'm working from does not report aggregate wages, but it does ...
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26 views

Using (summaries of) multiple time series as the independent variable in a regression

I am faced with quite a challenge. I would like to run a regression to see if variable X can predict variable Y. Variable Y (DV) is continuous (0-100) and I have 120 data points, so it's all simple ...
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How to analyze data for spatial aggregation and niche overlap with no specific GPS points over time?

I study soil insects, and sample monthly for insects. Each month, I sample at 8 different sites. Each site is divided roughly into 4 meter square quadrants (shown in figure). From each quadrant, I ...
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No of trials needed for a dependent event

I am from risk management. An event is defined as a system going down. Issue is a vulnerability in the system. Higher the severity of the issue , greater the probability that system is going down. ...
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38 views

Aggregating individual-level correlations to make an aggregate-level claim

I have a correlation between X and Y for different groups (they are states in the US, fwiw): I'd like to make some claim about the aggregate correlation: something like "Overall, as X increases, Y ...
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18 views

Comparison using MASE,MAPE for aggregated data with different points of forecast

Despite the fact that it's necessary to analyze the data first, is it possible to compare accuracies (MAPE/MASE) for differents points of forecast from aggregated data (flow, as in Silvestrini and ...
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11 views

Modeling Aggregated Variable from Disaggregated Exogenous

I'm trying to do a bit of research regarding what my options are with the following problem. I am trying to predict a nationwide value for retail supply chain volume, but my exogenous data is at the ...
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Aggregating a multivariate distribution

I'm currently trying to investigate how to 'quickly' measure the distance between a sample of data and a larger distribution of data. I have looked at the Kolmogorov-Smirnov test, which in some paper ...
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How can I measure how my clumped my spatial data are?

If I have spatial data how can I measure the degree to which the points are clumped? ...
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Average/Aggregation of 10 Discrete Probabilty Distributions

I have 2 experiments, where I have repeated each 10 times (20 experiments in total). I want to compare experiment A with experiment B. I create a probability distribution from each exp (20 prob ...
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How should I think about model selection when I will be aggregating predictions?

I'm estimating a model and then using it to predict values in another dataset. After predicting the values, I will aggregate the values to find averages within income quantiles. I know the ...
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34 views

Aggregating sales forecasts from mutually exclusive segments

I am using generalized additive models (GAMs) to forecast sales for 16 mutually exclusive and exhaustive customer segments. There are naturally correlations in these 16 series, including seasonal ...
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Why Does emmeans add_grouping average over the levels of the reference factor?

I've implemented a learning technology to reduce the gender gap(the difference between male and female student grades) in CS education. I conducted a quasi-experiment across six semesters, with ~200 ...
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Aggregation of daily futures prices to quarterly prices

We are working to incorporate the EIA future prices into our quarterly data set of financial balance sheet data. There are four different contracts, which are available at the EIA website. The idea is ...
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How to calculate the precision of the mean of univariate time series data, based on the precision of the discrete measurements it consists of?

Assume that the precision of the measurements is fixed and independent – each discrete measurement has the same degree of random error, and is independent of all other measurements. For example, ...
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How can I use spatial heterogeneity within regions as predictors about those regions?

Please forgive if I am misusing the term "spatial heterogeneity". I am trying to predict county level crop productivity using satellite acquired vegetative health (NDVI). Since this is pixel data, I ...
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Inference from small sample size with aggregated country data

I have a data set with country aggregate patient data for yearly total number of diseases, treatments provided by health services, and some other covariates for two countries over 10 years. The ...
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How can I aggregate the estimates for the rate of decay from different experimental runs?

I have data for a device that dispenses material and I want to use an exponential decay model in python to relate the flow rate to the mass left inside the device, in particular $flow = \beta_0 + \...
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272 views

Using independent t test on aggregated data?

Stats noob here. Is it possible and appropriate to use an independent t test to compare attrition rates of one department to another department? For example, Department A has 15 teams and Department B ...
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29 views

Estimating and doing inference about proportions when individual indicators are themselves estimated

I have a sample of $N$ units and $T$ observations per unit. For each of these units $i$, I estimate a measure of dependence between two variables,$Y_{it}$ and $X_{it}$. Call the estimated measure $\...
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91 views

A/B Testing on Aggregate Measures

Suppose we have built a new version of the "Recommended" page of our media website (e.g. Netflix) and are running a test to evaluate its effectiveness. We can collect data in the following schema: <...
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How to interpret hourly rate data given in one miniute intervals

I have time series data on natural gas flow, which is in units of "tonnes/hour". But the data are given in one minute intervals (each row represents a single minute of time duration). Here is a sample:...
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Monthly data vs aggregating weekly data to monthly in linear regression

Let's suppose I have weekly data available for making a forecast using a linear regression model. Let's also assume that the weekly forecasts can be aggregated to monthly ones. Would it make sense to ...
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Correlation of Aggregate Data on a monthly to quarterly basis

I am working with a data set of 42 countries of monthly migration. I want to extract factors using PCA, and find non stationary errors of my model, so I am working in first difference. However there ...
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Best Way to Aggregate further and Analyze a Data Point that is Already an Average

I want to understand how much time (on average) each Customer Service Agent (CSA) is taking to reply to messages that are sent by a Customer on a single chat. E.g., "Charles took on average, 22s to ...
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153 views

Regressions with different periodicity

I am trying to estimate a regression with variables of different periodicity. The dependent variable is given monthly, whereas most other independent variables are also given monthly, but some are ...
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189 views

Machine-learning using an aggregation function

I am looking for a machine-learning algorithm (ANN, random forest,...) that is able to account for an aggregation function during the learning step. I want to estimate variable Y from variables X1,X2,...
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1answer
69 views

Multiple data points per subject? Aggregation to mean with or without considering subjects

I am currently arguing with someone on how to correctly treat data with multiple observations per subject. More specifically data was gathered from 100 participants 8 times per day for 5 days (...
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35 views

Is it valid to get the average of the corresponding elements of two time series?

Say I have two time series that have the same length within the same time period. I need to replace the two time series with a single time series that explains the variations in both. So what I ...
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Recommended model to analyze relationship with aggregate rate

In order to analyze the relationship between some independent variables and a binary dependent variable, it is standard to use logistic regression, which allows us to model the probability of the ...
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427 views

Aggregation of “tree results” in random forest regression

I would like to know how the results of different decision trees are aggregated (average) in random forest regression. If I have a numeric target variable and 10 predictors, each decision tree is ...
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103 views

How to aggregate histograms for density estimation

Within a very large sensor network, each node does take measurements derived from a fixed number of samples taken at a high frequency from an instrument. The number of measurements send to an ...
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817 views

Machine Learning model with aggregated data as training

I would like to predict a LABEL: A,B or C using a classification machine learning model. My data to train the model is like: ...
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139 views

Aggregating Cluster Analysis Results [closed]

I want to write something about cluster analysis. I have started to read something about it and I faced with a concept which is called ''Aggregating''. What does it mean for cluster analysis? Do I ...
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1answer
56 views

Aggregation of overlapping intervals

Hello anyone and everyone, I have a data set of traffic flow data, particularly intensity data. I have the traffic counts per minute as the base data and then I am aggregating them into 3 and 5 ...
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28 views

Combining distributions

I have a ruler and a set of poles $S$. My ruler is not perfect, so a length measurement of one pole yields in fact a sample of a probability distribution (e.g. natural scientists usually find normal ...
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1answer
646 views

How do I aggregate percentiles from previously aggregated percentiles?

I have previously aggregated data for every 5 minutes with a count of sensors at that location and 5% percentiles of a value of interest: 5th, 10th, ..., 90th, 95th. A sensor can have multiple ...
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85 views

Time Series Data: Unequal Sample sizes

I have a dataset which consists of daily observations over a 3 month period for different variables. The data are aggregated so I do not have access to user level data. The problem is that the ...
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2answers
167 views

Aggregate repeated measures data or model it?

The structure of my data is causing me some trouble because I'd prefer to aggregate it but I'm not sure of the implications. It's from an experiment comparing dwell time. The subjects were randomly ...
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1answer
187 views

Forecasting proportions of aggregations vs direct forecasting

Assume one has to predict the sales of a shop on a daily basis. The sales per day $S(t)$ clearly follow a strong weekly pattern, but also a yearly pattern, a general trend and of course some noise are ...
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How to summarize items and still calculate percentiles?

My company wants to track request latencies for the project I'm working on. Specifically, the report I'm building should have the 95th and 99th percentile values of the latencies over all events. ...

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