# Questions tagged [data-analysis]

Use for question relating the the techniques of data analysis.

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### What is the difference between horizontal units and horizontal scale at an oscilloscope?

This is a picture of the data of a given measurement by an oscilloscope. I would like to know what the difference between horizontal units and horizontal scale at an oscilloscope is. I would be so so ...
44 views

### Why do I have to draw a big triangle to determine the gradient of a straight line using the slope triangle method?

I'm an igsce student, I'm taking igsce OL phyiscs. It's stated in my book that after I draw a graph and the line of best fit, I should get the gradient by choosing two points then form a right angel ...
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### Magnetic flux as a function of distance experiment

For my electrical engineering senior design I created an experiment to test magnetic flux (more voltage) increase from a material in a coil of wire. There is a large sending coil with A.C. voltage and ...
45 views

### Does it make sense to average data taken continuously as the system evolved?

I have a simulation where a bunch of particles are moving. Every time step I fit a gaussian (through non-linear least squares) to the distribution of speeds. Here I end up with a temperature $T_i$ and ...
35 views

### What is the relation between statistical and instrumental uncertainty?

I've been studying some error analysis on An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements by John R. Taylor for an introductory course. At the beginning of ...
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### Q. Significant figures on graphs

When displaying experimental data on a graph, must both axes use the same number of significant figures, which would be the variable with the smallest number of significant figures? Or (because a ...
31 views

### X-Ray Diffraction pattern peak tailing

I have recently been working with Rietiveld refinement on powder X-Ray Diffraction (XRD) patterns by using the GSAS2 (General Structure Analysis System) program where, one of the steps, is to produce ...
69 views

### Calculating the distance between a nuclear bomb and an object hit by the shockwave, all the while taking the video frame rate into account? [closed]

Imagine you are watching a YouTube video where a nuclear bomb goes off. Exactly six seconds later, the shockwave arrives and hits an object that is some distance away. How would you go about ...
22 views

### Prevent biased data analysis

When analysing experimental data it is simple to fool oneself. Therefore, I am interested in methods to prevent myself to draw biased conclusions. Robert MacCoun and Saul Perlmutter: "Blind ...
45 views

### What’s the difference between ‘decimated‘ and ‘undecimated’ data?

How is ‘decimated’ data different from ‘undecimated’ data?
29 views

### Linear fit error for beta decay spectrum

I'm trying to get an upper bound to the neutrino mass with kurie plot. In order to do that I need to make a linear fit in order to get energy value that corresponds to $y=0$. ($y$ the kurie plot). The ...
13 views

### What is significant in broad and narrow resonance peak to internal structure of the resonance?

I read about the multiquark system and It seems like many people said that a narrow peak mostly likely to be a molecule structure. The broad peak seems to be a compact structure. This is like a kind ...
27 views

### Generating Positive Kinetic Energy (PKE) from car velocity [closed]

PKE have high importance on fuel consummation and Eco-driving. I have a data frame with 3 columns, Time (each second), Speed(KM/H) in each second, and RPM ,from this data frame I want to calculate ...
42 views

### Understanding the ordinate at $R=0$ in a capacitor experiment [closed]

I've done an experiment to study a capacitor's discharge time and calculate an unknown capacitor's capacitance. With the help of an oscilloscope, I measured the time it took for the capacitor's ...
41 views

### I don't understand how to interpret “Events/MeV” in plots like this

I was reading a paper regarding electron excess events in MiniBooNE data and I came across the following plot: I don't understand how to interpret the meaning of "events/MeV". This is a histogram and ...
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### Modelling a spring powered car - using a cubic

I've designed, built and tested a mousetrap-powered car. However, I'm having trouble with how to fit the results. I claim an approximate fit to a displacement-time graph of the car should be a cubic ...
251 views

### How to incorporate the uncertainty of the model coefficients in the prediction interval of a multiple linear regression

I'm dealing with the modeling of small experimental physics data sets (specifically the stickiness of glue-compounds). As most experimental work does not generate thousands of samples, but rather a ...
36 views

I performed an experiment which measured the lifetime of a muon. The apparatus was very archaic and susceptible to disturbances, which means that there would inevitably be some unreasonable data ...
38 views

### Power Spectrum Density of real valued time series data

There are real valued time-series data X(t) and corresponding auto-correlation function ACF(t)=$\left<X(0)X(t)\right>$. As written in wikipedia, Power Spectrum Density (PSD) can be calculated ...
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### Optical pyrometry data analysis and manipulation

Today I was doing my Optical pyrometry lab experiment with a following setup. I had a wolfram wire light bulb connected to a circuit in which I could control voltage. Using the pyrometer, I was to ...
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### Homework/Lab question about my data analysis

I in the experiment, I have tried to find a relationship between a quantity B and quantity I. First I plotted the raw data into a graph and tried different curve fits in excel. This is the graph that ...
159 views

### Graph analysis of accelerometer data

I used my mobile accelerometer sensor to collect data from a moving bike where I held it in my hand in a way that the smartphone sensor +Y axis is in the direction of the moving bike always. This can ...
31 views

### Can we plot a FFT for a Decibel vs Seconds data?

I was plotting FFT for Decibel values corresponding to the time in which it was recorded using a DAQ for My project, The sample data looks like this, I was attempting to plot the FFT thinking that ...
343 views

### Light Bulb Resistance

If the voltage and current of a circuit containing a light bulb are measured using a multimeter after consecutively lowering the voltage (building of a data set), what (type of) function will describe ...
36 views

### How long should I record the data of walking acceleration for FFT analysis?

Seems there is no apparent frequency of walking activity (it should be approximately close to 2 Hz) Is it because the time of the data is too short? Here is my csv file:enter link description here
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### How to subtract background from many spectra which were taken with different background intensity?

I have two spectra, a spectrum of background signal (let's call it Reference) and measured spectrum consisting of searched signal and background signal. The searched signal is a peak/s with various ...
47 views

### Calculating uncertainty in a fitted model

I am working on a project that requires the measurement of the Verdet constant of a material by observing a phase shift in the cosine squared model provided by Malus's law. I have recorded the ...