Average most often refers to the arithmetic mean, but more generally to measures of central tendency that use most, or all, of the data values. Examples include trimmed mean, Winsorized mean, harmonic mean and geometric mean.

learn more… | top users | synonyms

1
vote
3answers
45 views

Average curve from set of curves

I have done some initial analyses on some patient datasets regarding neuro-degenerative diseases. A method I've used is DFA (Detrended Fluctuation Analysis) in MATLAB, which produced a family of ...
0
votes
1answer
15 views

How to properly calculate average need-based aid met by an institution?

As an institution we give out a certain amount of financial aid every year (need-based aid) to each student. This need-based aid does not always meet the students estimated need. My task is to compare ...
0
votes
0answers
23 views

Average waiting time in an exponential distribution

I have come across the following problem in one of my courses: Let's suppose a patient in a hospital is waiting to be picked by one of the two doctors available. The time till a new pacient arrives ...
0
votes
1answer
9 views

Average value when it is not included in the support

There are a few ways I think of averages of a (discrete) random variable: Average is an OLS estimate of running a regression of the random variable on a constant term. In that sense, it is a value ...
0
votes
0answers
8 views

How to decide about the number of looks (window size for ensemble averaging) in SAR images?

This question has frustrated me for a while. In order to find an answer I sent an email to prof. Yamaguchi, the author of the paper Four-Component Scattering Power Decomposition With Rotation of ...
0
votes
1answer
20 views

Method For Calculating Performance from Average Scores

In a simplification of my problem, let's assume we have players who can get an integer value score $s$ considering $\{ s \in \mathbb{N} : 0 \leq s \leq 3 \}$. Same sample data for scores: Player A: ...
4
votes
1answer
25 views

How do I compute an average when one of the measurements couldn't be measured?

In my biology class we were doing a lab on respiration rates of peas. We used a respirometer with a small pipet tube (markings up to 1 mL) to measure the volume of gas; by immersing in water, the gas ...
0
votes
1answer
30 views

Why 'Assumption of Uniformity' for Mean?

I am teaching some very basic statistics for grouped data. In a different class a few years ago I made an 'assumption of uniformity' about the data: within bins, data is uniformly distributed ...
1
vote
1answer
32 views

SVM classifier - can I average multiple models?

I'm performing SVM classification on a relatively large data set (~1M rows, 4 variables). I want to assign a classification score to each row, not evaluate input parameters, so following the top ...
0
votes
1answer
24 views

Estimate group averages

If I have 100 numbers from two separate groups $X$ and $Y$. How can I manually estimate or derive an algorithm to automatically estimate $AVG(X)$ and $AVG(Y)$? I know all the numbers, but I don't ...
1
vote
1answer
36 views

Should I exclude an individual being evaluated from group average?

I am working on some statistics of work related performances. Now at first I did my code to calculate the performance of a single individual and compared it to the average of a group in which the ...
0
votes
0answers
27 views

Recommendation System in Python - weighted average with negative factors

I am building a recommendation system in python on the 100k movielens dataset. My code build a movie/user matrix where the (x,y) element is the rate that the user y gave to the movie x. Since i want ...
0
votes
1answer
21 views

determine the mean cost per unit

I have N orders. Each order consist of x units and I know the total cost of each order. If I would like to determine the mean cost per unit do I use approach 1 or 2 listed as follows: (1) Determine ...
4
votes
1answer
36 views

Does Average have Units

I know that the average of a discrete random variable X can be estimated as:$$\widehat{E[X]}=\frac{1}{N}\sum_{i}x_{i}$$ where $i$ are the units we are averaging over. In practice, we just call ...
0
votes
0answers
26 views

Average many logistic regression results?

I have performed logistic regressions on several similar data sets (same type of data, different locations). I have 9 different observation types, 11 predictors, and 8 data sets (~3000 data each). I ...
0
votes
1answer
15 views

Calculate 3-year average on survey results

Statistics is not a normal part of my job. I've been given survey data from three years. Survey data includes a number of categories the respondents are split into. There is a set of five possible ...
0
votes
0answers
12 views

Trouble understanding equations with a mix of variances, expected values and means

Let's assume we don't know the real value $\mu$ of the average of a of random variable $x$. We can find an estimator for the variance using the Bessel correction: $$\widehat{V(x)} = ...
2
votes
0answers
19 views

Estimating actual score from small sample when population known

My inclination here is that there's no statistically sounds way of doing this, but I want to verify this. Suppose you have a population P, and you are measuring test scores across the population such ...
2
votes
1answer
43 views

Probability that the average is within range

I'm currently preparing for an exam, and I just can't seem to grasp how to go about the question given the following information: Information: A brick factory produce bricks whose length $X_i$ can be ...
3
votes
1answer
45 views

Bounding “an average”?

I'm doing a practice problem that is about processing orders. The assumptions are: "On average 40 orders are received" "50 orders per day can be processed" The task is to formulate notions about ...
0
votes
2answers
48 views

Handling null values when taking averages

I am currently working with a universe of 100 companies and interested in how they compare on certain metrics. Some companies do not report all metrics that I am interested in so I am reporting them ...
0
votes
0answers
11 views

Any algorithm for knn average?

I have a set of 10 features in a dataset corresponding to member purchase behaviour. I want to use knn to determine nearest neighbours for each member from test dataset on the train dataset based on ...
0
votes
0answers
18 views

A revision to a question I asked yesterday but got no response to on calculating average tenure

Here’s my question and it’s going to be pretty long winded. My company works in the online space and we sell subscriptions. We’ve been selling subscriptions since like 2011. My boss wants me to ...
0
votes
0answers
32 views

Understanding how standard deviation effects overall life when two variables are used

What is the total number of wheel lives of a railway car based on the following maintenance details? Every time an railway car comes in for servicing the wheels are brought through a lathe to have ...
2
votes
1answer
54 views

What is average tree size?

Suppose that you generate a sequence which stops with prob q at every step or proceeds with prob p. That is you will get bernulli sequence 0 or 10 or 110 or 11...10 with corresponding lengths 1, 2, 3, ...
0
votes
0answers
9 views

Recommendations based on Averages

I have a website where people can rate objects. Each objects has a number of properties. Objects do not all have the same number of properties, it could have anywhere from 1 or greater. All the ...
0
votes
1answer
25 views

Relative Variable Importance with Model Averaging

I am doing occupancy analysis for mammals using data derived from camera traps. I've fit the model using Rmark, dredged for the p covariates by fixing psi covariates, then performed model averaging to ...
0
votes
1answer
52 views

Is this equation a mean value?

I met the following equation. $b=\frac{\sum_{i=1}^{N}x_i^2 }{\sum_{i=1}^{N}x_i }$, $0<x_i<1$ $x_i$ are probabilities. Is it a kind of mean value? It seems that it is used as a mean value ...
0
votes
0answers
35 views

Standard Deviation of Averages

Any help would be much appreciated: My data is grouped into 42 categories according to classification of bird catch. Each group contains "X" amount of species, but for ease of input we categorize ...
0
votes
0answers
21 views

Chi-square on average of counts

My data includes one set of field-observer data, which I want to compare with 8 camera-based observation data sets. The cameras are at two points (Point1 and Point2), two models (R and B), and two ...
0
votes
0answers
15 views

How to average data with confidence intervals from nonlinear fitting?

I have a set of Planck emission (Temperature-dependent emission) at different powers, which I fit to determine Temperature. I want to use this data set to produce a Temperature vs Power graph. Thus, ...
1
vote
0answers
17 views

Can I take average value for variables in same category?

I would like to find if there exists theoretical background for taking average of variables. I have variables in the category of information. All of variables are scaled with 5 points, survey ...
0
votes
0answers
22 views

How to analyze price of air travel per mile distance

I'm trying to find the average price/mile for air travel. I found in an article that the average price is £35 + 7p or something and I wanted to know where that come from. I also wanted to ultimately ...
0
votes
2answers
28 views

Visualization of Twitter activity over a time

I have tweet counts for a bunch of topics by day, by week and by month. Now I want to visualize them using bar charts. Is it a good practice to visualize the exact counts or shall I take weekly ...
0
votes
0answers
10 views

Is there a way to calculated weighted mean with two weights associated with each value?

If there are n values with 2 weights w1 and w2 associated with each, is there a way to use both w1 and w2 to calculate the weighted mean?
0
votes
0answers
13 views

Estimating Annual Impacts from Cumulative Impacts for Meta-Analysis

I have cumulative impacts from experiments that ran for two years and impacts from a one-year version of the experiment. In order to conduct a meta-analysis on comparable results, I would like to ...
1
vote
1answer
148 views

3 Scenarios: How many Italian children should Anna expect in “Puzzled Primary School” this year?

"Puzzled Primary School" is a school in London which every year accepts 30 new children in one class, based on random allocation from a large sample. The list has just been allocated for this year. ...
34
votes
5answers
4k views

Will the fact that my Italian son is going to attend a primary school change the expected number of Italian children to be present in his class?

This is a question stemming from a real-life situation, for which I have been genuinely puzzled about its answer. My son is due to start primary school in London. As we are Italian, I was curious to ...
2
votes
1answer
103 views

What's the difference between averaging data then fitting and fitting the data then averaging

I wanted to know what the difference is, if any, between fitting a line to multiple separate "experiments" then averaging the fits, or averaging the data from the separate experiments then fitting the ...
1
vote
0answers
29 views

Find statistical significance for average of variables estimatod in different regressions

I have estimated GARCH 20 times for 20 companies in EViews with the normal distribution. I have used a dummy variable which is 1 during specific events to see if the conditional volatility is higher ...
0
votes
1answer
42 views

Is the average of a sum equal to the average of the sum of the averages of parts of the original sum?

Can anyone explain to me whether this is true or not? $$\frac{\sum x_i,_k}{n_i,_k} = \frac{\frac{\sum x_i,_j}{n_i,_j} + \frac{\sum x_j,_k}{n_j,_k}}{2}$$ Logically, it makes sense that they should ...
1
vote
1answer
17 views

How to average days until completion when some items haven't completed the cycle?

I am attempting to calculate the average number of days it takes for an order to go through our process - from receipt of order to delivery. When calculating the average days, how should I handle ...
2
votes
0answers
29 views

eigen problem of random matrix

Suppose I need to find the eigen vectors of a matrix $M(X)$ for any sample $X$ to be my dimension reduction projector. Then since I have samples $X_1,...,X_n$, so we propose to use the eigen vectors ...
1
vote
1answer
22 views

dangers of averaging between model approaches

I am working with some ridership data that is broken down by route, year and month. I have built and tested a whole bunch of models ranging from GLM, GEE, GENLIM, and Panel and ARIMA data models. I ...
2
votes
1answer
39 views

Making sense of Yes/ No Type survey

I have a survey with 1 single question: Do you wish to join our club? Yes/ No Apart from the usual % and count of yes/ no respondents, is there any other measure I can derive from this? For example, ...
0
votes
1answer
22 views

Can we do a T-Test when we have two columns of average data?

I have a data set assume as shown below: I wanted to know that can I use a paired T-Test to test if the average time spent is different Pre and Post change? (I am a little unsure because the each ...
0
votes
0answers
13 views

Correct or most valuable way to model consumption/usage among users of a product or system?

Is there a best method for approximating average daily consumption among users of a product? I'll use an example to illustrate. We have monthly data for the past year (we have all data since launch) ...
2
votes
2answers
168 views

Log of Average v. Average of Log

I am constructing a dataset of monthly averages based on daily data. This dataset will be used for standard regression analysis. I anticipate wanting to transform the dependent variable, which has an ...
0
votes
2answers
33 views

Average/extreme value in distrubtion

If I have a distribution like the one below, is there a way to say to what degree a value is part of the distribution? e.g. if I am considering the value 4.122e-4, it clearly falls within the ...
0
votes
0answers
28 views

taking decisions: how to combine scores from different systems?

I have several completely different software components that are producing scores for certain candidate solutions. Now, setting aside the technical details of what is the problem that I want to solve ...