Data Definition and 998 Threads

Data has come in from Isreal about the effectiveness of a third dose: https://www.straitstimes.com/world/middle-east/third-pfizer-dose-86-effective-in-over-60s-says-israel-healthcare-provider Remember this is 86% better than those that have already had two doses. I will leave it to others to...

Security Alert Millions of T-Mobile customers’ information reportedly exposed in cybersecurity incident. Oh great! https://www.cnn.com/2021/08/18/tech/t-mobile-data-breach/index.html

This is for the lab report I have to submit. ##n## is the refractive index. ##L## is the length of a gas chamber and ##m## is the number of fringes passed as the pressure in the gas chamber changes by ##\Delta p##. We are already given the error in ##L##. I performed the experiment and obtained...

Here are two examples: 1. Microsoft Excel. If you buy the newest version of Microsoft Office, it is able to open and read all files that were created with the older versions of Microsoft Office. Let's say that I have an older version of Microsoft Excel and I create some files with it. Later...

Kindly see the attached problem below (i find the topic to be easy and straightforward). My concern is only on the highlighted part: In my understanding, to define the type of correlation i have always approached a straightforward approach. For value ##1## perfect positive correlation and...

Ever since I learned about FM something's been bugging me, which is that the PLL error correction acts on the encoded data, seeming to leave open the possibility of the shape of the data itself interfering with the PLL's interpretation of what the carrier frequency is. It seems dangerous to mix...

Usually in papers there are many plots, and sometimes I do not understand how they plot them, with which kind of software or program they are plotted. I just attached three of the plots, I would be very thankful if you guide me, any of them is plotted with using which method, software or...

Is there an up to data source of data on the number of vaccines administered in the US by age and sex? And similarly is there up to date information on the number of Covid-19 cases by age and sex, as well as number of adverse events from Covid-19 infection?

I have two data frames df1 and df2 df1 has two columns 'player_name' and 'player_id'. Similarly df2 has 'player_id' column. From this configuration I want to pass 'player_name' column to df2 by using 'player_id'. For this reason I have tried something like this, df2['player_name'] =...

I have a set of data (representing the strength distribution of samples), and I would like to fit a normal-Weibull grafted distribution. To the left of a specified graft point, the distribution is Weibull, and to the right it's normal. At the graft point, the value and the first derivative are...

The average weight of a male child’s brain is 970 grams at age 1 and 1270 grams at age 3. (Source: American Neurological Association) (a) Assuming that the relationship between brain weight y and age t is linear, write a linear model for the data. (b) What is the slope and what does it tell...

Hello! Say I have some measurements ##y_i = f(x_i|a_1,a_2,...,a_n)## for different values of ##x_i##. Here ##a_i##'s are the parameters of the function I want to fit for. For example for a linear function I would just have ##y_i=ax_i+b=f(x_i|a,b)##. I want to see how the errors on the ##y_i##'s...

I would like to seek your take on the two terms; discrete and continuous in this context, In my understanding, when we look at height of individuals (in cms), this measure in general or in definition implies continuous data. If we are to look at specific math problem that involves height of say...

Hello everyone. I want to calculate the covariance matrix of a stochastic process using Matlab as cov(listOfUVValues) being the dimensions of listOfUVValues 211302*50. I get the following error: Requested 211302x211302 (332.7GB) array exceeds maximum array size preference. Creation of...

Hi all, So my old Win 10PC is slowing down and I am buying a new one. I want to transfer data from the old to the new without having to remove the HD. Wil just connecting the two PCs with a SATA cable enough to do the job? Is there a simpler, faster way?

I want to simulate the time domain data for a rotating radar. I assume that the space around the radar is filled up with a very big extended object and it moves with a constant speed in one direction. Picture attached.I don't take range information here. I am only concerned about the velocity as...

Hello! I have a relationship of the form ##y_i=ax_i##. In my case ##y_i## is a frequency and ##x_i## is a mass. For each mass, ##x_i## I measure ##y_i## (and I get a central value and an error). The difference between ##x_i##'s is about 1 (in some arbitrary units). Is it possible to extract the...

So, at home I have a weatherstation which measures solar irradiation in the east, south and west in lux. I can read in these measured sensordata. From these measurements, I would like to calculate the solar irradiance on my windows. The solar energy formulas could help me with that. The work of...

Hey all, I need help with the book I'm currently writing. What would it take (even theoretically) to use quantum entanglement for FTL data transfer? From what I understand, the state of entangled particles can not be changed without breaking the entanglement. Do you think this would ever be...

I am searching for Globular Clusters in SDSS data. From what I have learned after sifting through documentation and the data structures, there is no identifier by which I could directly search for GCs. Nearby clusters are catalogued as individual stars with no apparent link to parent cluster...

Is there an online data resource for electrolyte conductivities showing molar strengths and temperatures? thanks.

Hi PF! Suppose I have three pieces of data: x1 = 0:3:12 and x2 = 0:4:16 and x3 = 0:5:20 with corresponding functions y1 = x1.^2 and y2 = x2.^3 and y3 = x2.^4. How would you average these the "functions" with data (x1,y1) and (x2,y2) and (x3,y3)? My thoughts are: 1) linearly interpolate y1, y2...

https://arxiv.org/pdf/2011.15126.pdf https://nvlabs.github.io/face-vid2vid/ https://wandb.ai/ayush-thakur/face-vid2vid/reports/Overview-of-One-Shot-Free-View-Neural-Talking-Head-Synthesis-for-Video-Conferencing--Vmlldzo1MzU4ODc One thing in this modern world seems to be ubiquitous; the demand...

Hi. I'm looking for books on data science, preferably leaning towards neural networks, that focus on mathematical rigor. For example, theorems on optimization, minimum number of layers to accomplish a task efficiently, etc. Most books I've seen seem to hand wave this stuff. Anyone know any juicy...

<moved to General Discussion, posts that ask for thoughts are not hard science> Summary:: Soon? I've been thinking whether in the present time if not near future, or even already something common nowadays amongst intelligence agencies would be the use of steganographic data file searches...

See attached images.

How did you find PF?: Google search Hi all, I'm looking for a good example of a large dataset of non image-centric physics data (e.g. astronomy, particles, ...) so I can add an example to this section of my documentation (formal announcement for the Gallia library: see Scala users forum). I...

public static Region fromFile(String name, String file) { Region r = new Region(name); List<String> lines = readData(file); String[] headers = lines.remove(0).split(";"); Map<String, Integer> h2i = new HashMap<>(); for (int i=0; i<headers.length...

Let us suppose we have one constant variable ##b \pm \delta b = 20 \pm 1 ## and one function that depends on ##x ##, such as, ##a(x) \pm \delta a ## The problem is I want the difference between ##a(x) ## and ##b ## to be ##0 ##. Let me denote this difference as ##c \pm \delta c ##. To...

In cosmology, CMB tells a lot about which cosmological model can be acceptable or not. For instance we know that, whatever the cosmological model we use ##\theta_*## parameter will be always the same. Is there any other parameters that is listed in this picture is **model-independent** ?(i.e...

From what I understand thus far is the counting involves Poisson therefore the uncertainty is just the square root of the counts, correct? But when I take the square root of the counts it produces a very small number compared to the count which makes it insignificant therefore the error bars...

I recently checked my SULI application status just out of curiosity today and I found that the page that leads to the login was down (https://science.osti.gov/wdts/suli). After a google search I found the login page and logged into my account but upon checking my status, it said that there was...

I have a code like from random import randint from string import ascii_lowercase file = open("data.txt", "w") numbers = [] for j in range(26): # generating a list of random number random_num = [randint(0, 7) for i in range(120)] numbers.append(random_num) # matching these numbers...

How did you find PF?: Searching for "high school and college physics teachers discussion forums" I am a "kiddo" in Physics, like Dr. Jill Biden ;-) and following a highly anti-recommended circuitous path have ended up doing data seance. That should tell you everything you need to know about my...

I have an electronic device that sends me a signal but there is also a lot of noise. My question is, in general, How could I identify that pattern in the data I am receiving? So I would like to read articles or books talking about this topic. First thing I thought was using Fourier but I was...

Hi, I am not sure what the correct forum is for this question. Question: When do we need to remove seasonality from time series data to do a regression analysis? Context: I am planning to conduct a prediction analysis where I want to find out how a device performs. I hope to estimate a...

Hello, In Python and other programming languages, data can be of different types: integer, float, string, Boolean. On the other hand, Data structures are containers of data items which can (or not) have the same data type. A variable, when created, has: a) name (a piece of data stored in...

Hello all, I was just thinking how much I would love a book, or even better a portfolio, on different types of data visualisations. I'm sure there are a few such books out there, but I'm looking for something for technically minded people, which organises its examples by the type of data being...

Hi. I'm an undergraduate student and I've been doing research in Civil Engineering for a couple years now. One thing which I've thought about repeatedly is a bias toward the desired result. Of course sometimes people might be biased for some ulterior motive or sloppy work, but the bias I'm...

Good day, I am working on physics based neural networks and I am investigating the role of integrating physics based loss function on the network's training. So I am looking for physics based simulation for data generation (online tools) to generate data from experiments. I know I may...

Hello, I'm looking for data on turboprop aircraft engine propeller efficiencies. I'm hoping for a table of available modern engines with a propeller efficiencies for comparison. I've tried Googling but not much luck. I can't even seem to find propeller efficiencies on the individual engine...

I think the basic idea is quite clear, as for example defined by wikipedia: But when I google more about this "technology", I am getting quite various ideas about what is considered as data lake. Some of them: just a synonym to ETL approach to data processing a distributed file system, like...

I have two independant experiments have measured ##\tau_{1},\sigma_{1}## and ##\tau_{2},\sigma_{2}## with ##\sigma_{i}## representing errors on measures. From these two measures, assuming errors are gaussian, we want to get the estimation of Ï and its error (i.e with a combination of two...

Hello, I have recorded time-domain data from an experiment. I am using a finite difference time domain algorithm to simulate the experiment. The model has been tuned to resemble the data fairly well but I'd like to be able to quantify the fit. Most of what I see online seems to be about...

I have the impression (I've not actually researched the matter) that some online weather services publish data from weather stations set up by amateurs. Do any organizations incorporate such data in their weather prediction models? I'd think that using such data would involve a sophisticated...

this is a textbook problem shared on a whattsap group by a colleague... i have no problem in finding the value of ##k=0.08##, i have a problem with part (ii) of the problem. I have attached the solution here; how did they arrive at the probability distribution of ##y##? attached below is...

Hi bear with me I have a conundrum I want to ask you. If data traveled many times the speed of light could the results of decrypted cypher message be computed quicker than any system we currently have? For instance if we sent a burst of data at many times the speed of light across the solar...

I am from physics background and I need some background in Genetics to learn Genomic Data Science. So, can people here suggest some youtube playlist ? I have not studied biology for a long time , so no idea about biology. Suggestions welcome Thanks

I am trying to understand the Hurst motor data sheet, but i am not clear on the table provided, please help me to understand the data provided System Input: Volts is all in the range of 24V, so it is 24V BLDC motor, i understand. Amps: It is the current drawn from the DC source i understand...

Suppose you have a .csv file that resembles something like this: Name,Profession, ... Mike Jones, Driver, ... And now suppose you have many .csv files pertaining to information about people who drive for a living. Profession,Qualified to Operate Motor Vehicle,... [variation of...