For questions about estimation and how and when to estimate correctly
Questions tagged [estimation]
1748 questions
0
votes
1 answer
Estimate of Subtraction when Observed Outcome May Result from Subtraction and Addition
The problem I am trying to answer is as follows:
1) I have a stack of parcels in my house.
2) Each day, the post may bring more parcels and/or I may send parcels away.
3) At the end of the day my wife returns home and counts the number of parcels in…
Jason
- 1
0
votes
1 answer
Formula to increase concentration in one solution using 2 substances simultaneously
Using the following formula:
V2 = ((D-C1)/(C2-D))*V1
It is possible to estimate the amount of higly concentrated V2 with value C2 that has to be added to the base solution in order to increase the value C1 of that solution to D.
Example:
D = 50
C1…
KROLN
- 105
0
votes
0 answers
Can conclude from the values from maximum likelihood estimation.
Determine the maximum likelihood estimates of a and λ when X1, ..., Xn is a sample from the Pareto density function
f(x) = λαλχ-(2+1), if x ≥ a
0 ,if x
nointell
- 1
0
votes
2 answers
Estimate size of union of non distinct finite sets which size is only known as an aggregate
I have $n$ unknown finite sets $A_1,A_2,...,A_n$. I only know:
$|A_n| = X_n$
$ |\cup^n_{x=1}A_x| = X$
$ |A_x \cup A_y| \leq |A_x| + |A_y|\ with\ x,y \in \{1,...,n\}$
Can I estimate the size of $ \cup^6_{x=0}A_x $ better than using the inequality…
Sim
- 208
0
votes
1 answer
How to estimate a difference?
I have a doubt what is the estimated difference of $91-45$ so I started to think about two methods the first was I will first find the difference of $91-45$ that is 46 than I will just round off 46 nearest tens so I got 50 as my answer.my second…
user971462
0
votes
0 answers
How to evaluate the accuracy of of coefficients $a,b,c$ in evaluating $z$?
The following formula is the SCS equation for evaluating Cumulative Infiltration :
$$z=at^b+c$$
In the equation $c=0.6985$ is a constant but I am allowed to use $c=0.7$ as an estimation. I have a table for the values of $z$ and $t$ ( it denotes the…
Amirali
- 1,149
0
votes
1 answer
Estimating Number of Lottery Players Per Game
Below I have created an excel spreadsheet showing real data of the 6/49 national lottery in Canada. The "ODDS 1 IN:" column are the official odds of winning what is shown in the "Prize Category" column.
The "PLAYERS" column is one I created by…
Cannon444
- 81
0
votes
1 answer
Calculating accuracy from relative Error
Assume for an Estimation and measured value
$$
E(x) = 6\\
M(x) = 2
$$
For calculating the relative error it is used
$$
E_r = \biggl|\frac{E(x) - M(x)}{M(x)}\biggl|
= \frac{4}{2}
$$
For calculating the accuracy I have gotten the formula $$A(x) =…
chenino
- 1
0
votes
0 answers
Calculate the estimate percentage of impressions at top
Ok, So I'm trying to get percentage estimate of how many impressions are at the top of a search page between the hour. Based on the metrics: $Impressions,\,Previous\,Impressions,\,Top\,Impression\,\%\,\&\,Previous\,Top\,Impressions\,\%$.
For ease we…
DCdaz
- 101
0
votes
0 answers
a formula about Pochhammer symbols
The Pochhammer formula reads
$$(a)_n=a (a+1)\cdots (a+n-1)=\Gamma(a+n) /\Gamma(a)$$
Here I want to rewrite a Pochhammer formula and my formula is:
$$(N(\alpha+1))_{(\beta-\alpha)n)}~~~~~~~~~~~~~*$$
Can I rewrite Eq.~(*) to a formula, like $(---)_n$?…
Blueka
- 11
0
votes
1 answer
How to use C=aLb formula to calculate cost?
I'm calculating software development cost.
I don't know what do to with given formula so I need explanation.
C=aLb
Where
C = Costs
L= size (Line of code in thousand lines of code e.g 400)
a and b are constants
Constants…
Hemlata
- 103
0
votes
1 answer
Estimation error
Let consider a simple equation $$I = \frac{V_1-V_2}{R}$$ with $R = 0.001$ and $V_1, V_2$ around $10\ 000$, while $I$ is around $10$. The problem is $V_1$ and $V_2$ are measured with some small error (compared to $10\ 000$ as nominal value) of around…
0
votes
0 answers
identifying outliers
I am working on a code in python to identify outliers. I have a dataset with 500 restaurant orders, and their total. I want to identify the outliers in the dataset. And then decide if they are valid data point or wrong values. And then remove the…
leena
- 103
0
votes
1 answer
Set Theory Intersection estimation
Let's say I have 10 finite sets $X_1, X_2, ..., X_{10}$.
Given the values $|X_i|,$ for $i=1,2,..,10$ and $|X_i \cap X_j|$ for $i\not= j$ and $i,j=1,2,...,10$,
what is the best estimation of the cardinality of
$$|X_1 \cap X_2 \cap ... \cap…
Luca
- 1,616
0
votes
0 answers
MSE of Gaussian random vector
first time to use this website, hope I made it correctly.
Suppose $\underline{X}\sim n(\underline{\mu},\Sigma)$ where $\Sigma= (\begin{matrix}&\Sigma_{11} &\Sigma_{12}\\&\Sigma_{21} & \Sigma_{22}\end{matrix})$where
$\Sigma_{11}$ is (n-1)*(n-1)…
West
- 1