Questions tagged [statistics]

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Number of data points needed for INL DNL estimation

In this article where ADC of pico pi is characterized, I found a part that I have never encountered in my study of mixed signals design: I don't understand how we number of data points needed is ...
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2 votes
1 answer
46 views

How to monitor Ethernet packet loss real time on different connections?

For an embedded application we have a network with star topology, where we want to determine if there is packet loss for the different point-to-point (SMAC => DMAC) connections. We consider ...
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0 votes
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Distributed Bayesian Detection with a two sensor tandem topology and unknown parameters

If you don't know the correct keyword, you can still miss a key literature search: I have a problem in distributed Bayesian detection with a serial (or tandem) network topology. The probability ...
1 vote
1 answer
257 views

Estimating shot noise - what's the origin?

If I have some photon detector, say a CCD, how do I estimate the error introduced by shot noise correctly? Typically, sources found on the internet say that the shot noise is the square root of the ...
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4 votes
3 answers
814 views

What is the physical significance of skewness and kurtosis of an eletrical signal?

I understood the mathematical meanings of the skewness and kurtosis. But when we calculate these quantities for a signal (say an electrical voltage signal), what physical meaning do they convey? For e....
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-1 votes
1 answer
272 views

Is measurement uncertainty 2 times standard deviation or 2 times standard error?

Textbooks and online sources often say the industry standard for uncertainty is given at a confidence interval of 95 %. This means out of 100 measurements, 95 would achieve the specified value and ...
0 votes
1 answer
38 views

Suspicious definition of erlang distribution in Verilog-2005 spec

The $dist_erlang function in Verilog-2005 takes an argument called mean. Some information about the ...
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0 votes
3 answers
234 views

measurement errors: add up or cancel out?

Take an accelerometer, or a hall sensor, or a thermometer, or any sensor. It will have an accuracy, which means the readings will contain some error of this sort. My guess is that by taking a big ...
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3 votes
3 answers
1k views

Why are different RMS noise sources added in this way?

I'm wondering why noise sources are added such a way their RMS values are added in square root of sum of squares fashion. For instance if the RMS noise values from three sources are X,Y and Z, then ...
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0 votes
2 answers
99 views

Difficulty of implementation of this Rayleigh variate generator on simpler FPGA

For a university module we have been tasked with a 'research project' whereby we need to implement an FPGA non-uniform variate generator. I've identified one possible choice for the specific ...
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1 vote
1 answer
124 views

Are there more (mains) electrical safety incidents in the United States compared to the UK? [closed]

Forgive me if this question isn't exactly "on topic" for this site -- it's a bit meta. I am an academic in the UK, and I occasionally design electrical devices that plug into "the mains" in one ...
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2 votes
1 answer
171 views

PCB Thickness Variability

How much variability is there in the thickness of a standard PCB? Let's say I order a 1.6mm FR-4 board. Will the actual thickness range 1.5mm-1.7mm? 1.4mm-1.8mm? 1.59mm-1.61mm? What is the (...
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0 votes
0 answers
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Best method for determining tolerances based on production data

Say I am producing a wound coil which is ultimately going to be used in a colpitt's oscillator circuit. I measure the Ls and Rs of the coil, and then install it in a ferrite and then test it in the ...
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1 vote
1 answer
61 views

Stochastic Processes wtih respect to the electric load demand [closed]

I am required to look at the statistics (stationarity, mean, standard deviation etc) of the electric load profile. I decided to use the load data for the IEEE reliability test system as it has all ...
2 votes
2 answers
52 views

Random Error Waiting Time

Suppose that you have a design that has had an error after running 14, 18, and 20 hours. You're not exactly sure what is causing the error, but you make a change to the design that MIGHT fix it. ...
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0 votes
1 answer
146 views

Second moments (i.e E[X^2]) for this WSS random process

I've attempted the question, please see attached image of my working out and solution to the question. My main question is how to go from the last line of my working out to “2Rx(0) - 2Rx(t) in the ...
-1 votes
1 answer
2k views

How dangerous are LiPo batteries in phones, laptops, tablets? [closed]

Having recently read this question with its answers it seems like I should never ever charge my phone/laptop/tablet unattended. It also seems like I should always be worried about my devices exploding ...
6 votes
6 answers
2k views

Statistical accuracy of multiple resistors in series or parallel

I'm having a senior moment and would appreciate clarity. I'm working on an inverting amplifier design where I need to add low-pass filtering and a voltage clamp. Without the filtering and clamp, the ...
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0 votes
2 answers
1k views

Accuracy of RMS of sine measured from N samples of ADC conversion

I am sampling a pure sine wave for 1mS at 200nS conversion rate over a 12 bit range, getting 5000 samples. I need to know how accurately I can determine the RMS value of the sine wave. More generally, ...
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3 votes
1 answer
2k views

when to use auto correlation and when to use fourier transform

In communication, if we don't know any prior information about the signal, we perform an auto correlation say Rx(T) and take the Fourier transform of Rx(T) to analyze the power spectrum. Supposing ...
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3 votes
1 answer
4k views

Statistical noise measurement

Is there an accepted measure of noise in a data set? I am taking a series of reading from an ADC, which follow a trend (they are not random data points). However, they generally lie above and below ...
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