Data Definition and 998 Threads

  1. M

    A Can Probit or Logit Models Be Used on Panel Data with 50 Subjects?

    Is it possible to use probit or logit models on panel data? Mons
  2. J

    B How to Present Statistical Data

    <Moderator's note: Moved from a homework forum.> Mass (g) +/- 0.01 grams Drop height (centimeters) +/- 3.00 Shell 53.47 45 No crack 56.78 45 Cracked...
  3. GhostLoveScore

    Can I do something scientific with daily temperature data?

    I've been logging daily temperature and humidity data for two years now. In the end of each year I will put a graph like this Those are daily minimum and maximum temperatures. But I was wondering, if all this has any scientific value at all. I've been using WS2300 weather station for these...
  4. 1

    A I need a Straight Compact Linear data model

    Does anyone know a model to identify Straight Compact Linear data? I've been toying with Pearson Correlation Coefficient and am very disappointed. https://en.wikipedia.org/wiki/Pearson_correlation_coefficient I originally thought that this would be exactly what I needed, but... After some...
  5. Y

    MHB Linear Combination - missing data ?

    Dear all, I am trying to solve a question, and I think that something is missing. It is given that the vectors u and v are solutions to the non-homogeneous system of equations Ax=b. If the vector ku-3v is a solution to the same system, then: a) k = 4 b) k = 3 c) k = 0 The correct solution...
  6. B

    Healpix: How to convert from data to map?

    Hi. At first,I am sorry that my English is so bad. I've just installed Healpix on cxx(c++), and I'm starting to leraning. then I made txt file containing binary data(RING pixel and corresponding to data like temperture),and I want to make Healpix RING map of the data. but I don't know which...
  7. M

    Chemical Industry Data: Sources for Production & Prices

    I am curious about production amounts and prices for an annual period, for a few thousand commodity or common chemicals. I noticed a couple chemical intelligence services but they seem out of the price range for an amateur researcher. What kinds of sources are available to look further?
  8. Phylosopher

    I Solar Images Data: Where to Find?

    Hello everyone,I am trying to acquire the data used to make solar images like in this link. For various wavelengths, but mainly for visible. And, honestly I am having a problem finding the data. I am assuming that these images are made using a set of data for each, am I wrong? I don't have a...
  9. D

    How do I calculate the enthelpy of formation using combusion data

    The enthalpy of formation equation: ΔHƒ°reaction=∑Δhƒ°(products)-ΣΔHƒ°(reactants) When using the enthalpy of formation equation you get: -2010-((-394x3)+(-286x4))= 316Kjmol-1 However, this answer is wrong. On the mark scheme, the answer is -316Kjmol-1. So I used the enthalpy of combustion...
  10. R

    Math Job opportunities USA that combine data science with physics

    Hello, I am a Belgian master in physics and astronomy with a couple of years of working experience under his belt, who recently decided to obtain a second master in statistics. Normally I should graduate in 2020. My goal is to become a data scientist, but preferably within a scientific context...
  11. alan123hk

    B Gravitational waves for data communication?

    When and how can the gravitational wave be used for data communication, which the speed be much faster than the current technology by means of electromagnetic wave like 5G, 6G..etc wireless systems ?
  12. kolleamm

    Where can I find free training data for my chatbot AI?

    I've built an offline chatbot AI, you basically give it a conversation and it learns from it, such as how to respond to certain questions or statements. So far I've just been having conversations with myself and used that as training data. Is there free training data out there similar to...
  13. A

    A What is the best free software for analyzing powder XRD data?

    I studied an elementary course as an introduction to Solid State Physics. Now I have powder XRD data to practice crystal structure determination. I am going to do this alone in my computer. I want to know what software to use (free software) with manual of course. Any help please?
  14. QuantumQuest

    Insights Intro to Data Structures for Programming - Comments

    Greg Bernhardt submitted a new blog post Intro to Data Structures for Programming Continue reading the Original Blog Post.
  15. srbheese

    I Where do I get raw data for plotting Bragg curve?

    Hi people, I am looking for a database where I can get raw data to plot the Bragg's curve for alpha particles energy loss vs range in Silicon, Germanium and CZT. Your help will be much appreciated. Cheers, Shri
  16. J

    Which mechanism and which step would best fit the data?

    Homework Statement Two mechanisms are proposed (as seen in the screenshot). Which mechanism and which step as the rate determining step would best fit the data? Homework Equations I think this is more of a conceptual problem ... The Attempt at a Solution I apologise for not strictly...
  17. TechTree

    Questions about data wire shielding

    Hello, I've been splicing a HDMI cable which has 19 wires in total I've soldered all the data cables apart from the 5 shielding wires. I'm a little confused because as far as I know the wire shielding is meant to act as a faraday cadge to stop interference. But when I don't connect the shielding...
  18. DariusP

    I Question about spectrometer data

    Hello, I want to ask about this picture. This is a one bit of plasma spectrum from copper plate. Does anyone know what those romanic numbers (I, II, III) mean or what those numbers in [ ] mean? Also why am I seeing multiple element names on a single peak? I am so confused... P.S. The x-axis is...
  19. TechTree

    Computer What device would I need to send data over power lines?

    Hello, I'm trying to send binary data over the power lines to a microcontroller, which triggers a relay turning on a light. I was wondering what kind of device would I need to use to achieve this? And how would I connect it up to the microcontroller? I'm fairly new to this, so if someone could...
  20. TechTree

    Electrical interference on data cables

    Hello, I've got two computers that are in separate rooms and I have placed plastic conduit through the small space above the ceiling. Which will have a USB data cable, an Ethernet network cable, and a HDMI cable inside. The conduit length is about 8m long. And I was wondering if this setup could...
  21. F

    Can someone recommend an algorithm to optimize this data

    I have a data set of samples, and I made up some variables that filter out unwanted samples from the data set. Say each sample has values ##\vec{x}=x_1, x_2,..., x_n##, and I know the values of ##\vec{x}## for each sample. Also, if I sum up all of the samples, I get a value, ##Z##, which tells...
  22. Shaw-krow

    Long distance broadcast, internet data packets across town?

    I got something i want to do for fun and help out a...person i know but i never finished high school so that's my degree level. i was wondering if there is a way under $100 to possibly use my internet or posibly 2 peoples internet connections on the other side of the town i live in, split up the...
  23. R

    Probabilistic data association with a particle filter

    Homework Statement Hello everyone, I have to implement a probabilistic data association filter with a particle filter. I have already implemented a PDAF based on the Kalman filter. The assignment considers a radar (range,angle) tracker. With the state s containing the x, y position and the x...
  24. Eclair_de_XII

    What is the procedure for loading a data set from a textbook in R?

    Homework Statement I'm using a textbook called "Introductory Statistics with R" by Dalgaard, and I am having trouble doing one of the problems. It asks me to isolate names from a data set called "juul". But the problem is that I am unable to locate said data set. Homework Equations Functions...
  25. W

    I How many galaxies do we have red shift data for?

    Im wondering does anyone know roughly how many galaxies we have red shift data for, just a ball park. Is it hundreds? thousands? millions?
  26. M

    I Fitting functions based on imperfect data

    I have a set of values and I'm trying to come up with functions to fit that data. Here is what I know about the data: It is rounded down / floored to the nearest significant digit (i.e. 1 for v1 and v3, 0.1 for v2). Columns v1 and v3 look linear (e.g. first order polynomial). Column v2 looks...
  27. ohwilleke

    I Is there new LHC data on coupling constant running?

    Question Has the LHC released any papers or reports on the observed running of any of the three Standard Model coupling constants with energy scale from either Run-1 or Run-2 data (or both data sets)? Last time I looked I couldn't find any data As of January 2014, I had not locate any papers...
  28. mesa

    Looking for excited state gamma emission data on everything?

    Hey guys, I am looking for a database on gamma emission from the first few excited states of known isotopes for a piece of software we are putting together. Any format is fine. Thanks!
  29. F

    I Maximum Likelihood to find the original data or estimation directly

    I make confusions in the using of Maximum Likelihood to find (approximately) the original signal knowing the data observed and the using of Maximum Likelihood to find estimations of parameters of the PSF 1) Find (up to some point) the original signal : I start from this general definition (in...
  30. Alexanddros81

    Use the data to construct a graph etc.

    Homework Statement Serway Physics Section 2.4 Acceleration (a) Use the data in Problem 5 to construct a smooth graph of position versus time. (b) By constructing tangents to the x(t) curve, find the instantaneous velocity of the car at several instants. (c) Plot the instantaneous velocity...
  31. m4r35n357

    I Request for specific derivative data

    I am writing some automatic differentiation routines for Taylor series, and would like to verify my results for the value and first six derivatives of ##sinh## and ##cosh## evaluated at ##\pi /3##, and also ##tanh##, and ##sec^2##, evaluated at ##\pi / 4##. I have attempted to use this site to...
  32. jedishrfu

    How Can DNA and Big Data Be Used to Find You?

    https://www.vox.com/science-and-health/2018/10/12/17957268/science-ancestry-dna-privacy
  33. gfd43tg

    Why Haven't Car Companies Implemented Comprehensive Data Historians Yet?

    I think it would be great if cars software could historize data such as speed, using turn signals, etc which can be used in court to prove/disprove if someone was in fact speeding or didn’t use their turn signal. Why haven’t companies moved this way yet?
  34. M

    Python How to plot timeseries data in Python

    I have a dataframe that looks as attached. What I aiming to do is to plot the lines for each type where if it is for type A, I want to be able to have two lines in the graph that shows the trend for type A. I was not able to find any examples online especially with the format of the data in this...
  35. S

    How Can Scattered Data Impact Tool Performance Analysis?

    Hi all, I have few measurements of a tillage machine running two types of soil engaging tools in terms of geometry (named A and B, respectively). I have measured the draft for running the machine and the speed. My aim is to analyse how much is the difference of the two tools in terms of force...
  36. H

    New Google scientific data search engine

    I tried a search for this first and had negative results so I thought it might be helpful. Google has launched a new https://www.techsupportalert.com/content/google-launches-new-dataset-search-engine.htm feature that enables laypersons to retrieve highly specific results from millions of...
  37. M

    I Could New Resonance Insights Challenge Standard Model Predictions in LHC Data?

    Hello! The attached pic is from this paper. So on the y you have counts and on the x you have a certain parameter used to search for a certain resonance. The colored part is the Standard Model (SM) prediction and the black dots are the obtained data while the dashed lines are the simulated...
  38. Leonardo Machado

    I Neutron Stars mass and radii observation data

    Hello everyone. I'm currently working on NS mass relations and trying to plot a curve with predicted masses-radii and observations on NS. There are some free data at this website: http://xtreme.as.arizona.edu/NeutronStars/index.php/neutron-star-radii/ . I downloaded the .tar file and tried to...
  39. M

    Question about Designing EMG data acquisition

    Hello I'm working on project called"design & implementation of EMG data acquisition",after I search on these systems i really confused about what the gain and the filter type that i have to use. at the first stage i use instrumentation amplifier to amplify the signal, so how much the gain of...
  40. G

    A How can I simulate 2D correlated data with continuous-valued variables?

    Not sure this is the right area to post this. Let's say I have particles on a lattice, and they all have some property (ie, color) that is correlated at some known correlation length. I want to simulate this! In 1D I could do something like have color be a random walk in the given dimension...
  41. H

    Extracting data from a spectrometer to Excel

    Good morning, I used the Laser beam with HR4000 spectrometer with Ocean View software when saving the files it is saved by (.ocv) format. when trying to extract information to excel I get some unreadable data like (bkg thin sheet gel.png) attached. I used the same instrument and software with...
  42. W

    How can I store data permanently in SAS using a Libname?

    Hi All, Trying to get basics of inputting data into SAS ( University Version, i.e. in remote Virtual Directory in SAS Studio . I hope my layout , nor my general writing are too confusing. Feel free to suggest a different format): Please critique: We want to read file 'FileName' into SAS for some...
  43. M

    A Decoding Hubble Data: Acceleration and Age of the Universe

    this graph: http://www.pnas.org/content/pnas/112/11/3173/F1.large.jpg?width=800&height=600&carousel=1 from: http://www.pnas.org/content/112/11/3173 can be found on many sites. the origin is D=0 and t=0. cosmology claims the universe is accelerating over time. the graph shows acceleration over...
  44. Wrichik Basu

    MATLAB Troubleshooting Best Fit Line and Distance Calculation in MATLAB

    I have some experimental data, and I would like to plot a graph in MATLAB and also find the best fit line. I also want to find the distance between each point and the best fit line, and if the distance is greater than 1 unit, an error will be shown. For this, I have written a function. Here it...
  45. J

    Where can I find rotational/vibrational temperature data for ethane?

    Hi, Where would I find data for rotational/vibrational temperatures for a particular molecule (ethane)? I tried googling but had no luck. Also can you compute the moments of inerta for a particular (simple) molecule?
  46. P

    A Generating tables of data with LHE files from madgraph

    Does anyone know how to take the LHE file from madgraph, and get a table of \sigma and invariant masses of all pairs for each run? Thank you very much for your help guys. Have a great day!
  47. FallenApple

    Job Skills How to quickly prepare for a Data Science Career

    Some background, I have a Masters in Statistics and Bachelors in Applied Mathematics so It's not like I'm starting from scratch. But after graduation, I've been involved in education. I'm about one year out. I suppose this would hurt me in breaking in the field. I've interviewed at a few...
  48. David Browning

    I Any Advice Analyzing Root Data

    I've recently started my new RA position, and I've been given the task of analyzing a root data file. I'm not completely lost, but I don't exactly know what I'm doing. The point of my post is not to ask for answers, merely advice. A place I could go for info on data analytics. Pointers on how to...
  49. redtree

    I Curve fitting the luminosity distance and redshift data

    Can anyone recommend papers that directly curve-fit redshift as a function of luminosity distance for type Ia supernova and gamma ray bursts? I am looking for papers that do not curve-fit the data via an assumed model, even one as simple as Friedmann–Lemaître–Robertson–Walker (FLRW) metric. I...
  50. Guilherme Franco

    A Little help interpreting spectral data from an article

    I'm trying to find a good database of absorption or reflection spectra in visible light for pigments. I've found a wonderful database in this article: http://e-conservation.org/issue-2/36-FORS-spectral-database#CSV It's almost exactly what I needed Except I don't understand the data The...
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