Data Definition and 998 Threads

Homework Statement I have an upcoming assignment for a Statistics/Probability class that requires me to write a program in R. The assignment requires me to do the following: 1. Obtain the sample mean x and sample variance s2 of the sunspots data. 2. Provide a histogram of the data. 3. For...

I apologize in advance if this is not the correct place to post this. I am currently writing a paper in no-scale supergravity inflation, and now that the Planck 2015 results are here, it would be nice to use them to constrain the parameters of the model. I am in particular interested in the...

http://astrog80.astro.cf.ac.uk/Planck/Chromoscope/']I[/PLAIN] saw this referenced in a blog last week and thought it worthy of sharing. http://astrog80.astro.cf.ac.uk/Planck/Chromoscope/ It's built off of Chromoscope, an app for visualizing the sky in a range of wavelengths, but it uses...

Hi, I am working on TDR (Time Domain Reflectometry). I send a 7GHz bandwidth fast rising edge (14ns) square wave into a coax. I get a return Signal. I have an ADC with 10Msamples/sec. I am using MPLAB IDE for coding the microcontroller. Now I would like to increase the Points on the...

Is anyone aware of any book(s) that presents the history of data analysis techniques? I'm most interested in how scientists during the enlightenment dealt with uncertainties and how techniques for dealing with uncertainty developed over time.

I was wondering if anyone would help me get my hands on some telescope data and images of exoplanets. I know they must exist somewhere in databases on the internet, but I haven't been able to find them myself. It would be great if one of you could show me where I could get them or even if you...

I'm looking for sources of data for galactic rotation curves but need not only the observed rotation curves but also the expected (Keplerian) curve data to load into a spreadsheet to experiment with. After extensive searching I found a few pockets of data for observed velocities but not for...

I'm currently working on a master's degree in physics where my project uses C++. I have read about how some physics phD's were able to get data scientist roles despite working on computational astrophysics. This is a little surprising to me since I thought experimentalists would be more suited...

The Planck 2015 (formerly 2014) Data Release will finally be released to the public tomorrow February 5. Details at- http://www.cosmos.esa.int/web/planck

Hi I am new member and I am new to the Signal processing so I hope I could get some help from the members to able to understand the concepts. I have a Signal. I have a 10Msaples/sec ADC. I view the Signal on an Oscilloscope which has 20Gsamples/sec sampling rate. The Point where I am...

Why is better to use the standardized data using the correlation matrix than say converting data into just similar units. Like say I had data that measured car speeds measured in seconds for some data and the other data measured in minutes. Why would it be better just to measure the data using...

Hi everybody, my question is not properly about CFD but mainly about Fluid Dynamics itself. I have performed a RANS simulation of a round jet of methane and air and now I'd like to compare those results to some experiments. Unfortunately there aren't papers about experimental data for...

Homework Statement Use the data: P/bar a: 0.1000 b: 0.5000 c: 1.000 d: 1.01325 e: 2.000 vs. density/(g/L) a: 0.1771 b: 0.8909 c: 1.796 d: 1.820 e: 3.652...for an unknown gas at 300K to determine the molecular mass of the gas...

Homework Statement In my circular motion lab, I have to find the Varying Force. I have a constant Bob mass, and constant radius. I also have the data recorded of the Hanging mass, Time for 10 circles, period, force, and speed. Then I had a velocity vs force graph which I plotted the data and...

For example I have the variables x, y and a probability distribution p(x,y). I want to approximate p(x,y) as a linear function, a plane in this case, at least somewhere in the domain. However I only have samples from the distribution. In case of big amount of data the it is easy to collect them...

Homework Statement You will learn a lot about the motion of falling objects in chapter two. At this time you do not have to make any measurements. This exercise is purely numerical. The following table shows the position of a falling apple, in meters, at several instants in time. The clock was...

Hey Guys! I am working on a math project and I am stumped. I'm not sure weather I should use the chi-squared test or another test with my set of data. I am testing weather there is a relationship between crime rates and the unemployment rate of cities. Could someone please help? I'm not testing...

I wonder. If I received the data (I don't know in what format) of all or part of my genome sequence, whould all the genes and SNP's that are physically in the same chromosome (not its homologous one) show together in the data or the process of sequencing and assembly mixes them up? I understand...

Homework Statement Question is determine the maximum amount by which the Analogue to digital converter output can differ from the analogue input when a 8-bit Analogue to digital converter has a full scale input of 2.55 V. It has a specified error of 0.1% full - Scale. Homework Equations %...

Hi mates, I have to find solar cell efficiency by datas that given. These datas comes from an experiment in light and in dark. I found efficiency in light by square method with IV curve. But i don't know how to find in dark. The square method doesn't work cos data crossing the origin, no area to...

I have some (x,y) data with x in the range of 1e10 and 1e13, y is between 0 and 1. I am fitting this data using several theoretical models to gain an understanding of underlying mechanisms (by which model fits best). Using NonlinearModelFit in Mathematica, I get memory failures and cannot...

See attached image. I have never heard that before. Why wouldn't one be able to implement a data structure that stores a matrix by its columns using C? Is that true?

I am still in high school but my curiosity is not stopping me from posting in this forum. How is data stored in SSD? How does it differ from the old HDD? I heard that atoms are used to store data. How? Binary consists of 0 and 1. How does someone use an atom to represent 0 and 1? Does positive...

Good day, i need your advice on my latest career.I have B.Sc in Physics,M.Sc in Solid Earth Geophysics and now currently doing my Ph.D in non linear dynamics,investigating of chaos in geophysical data using correlation dimension and lyapunov exponent.I need your advice on how to be grounded in...

I need help! Could you please double checking my work: calculating a Power information from data I am collecting. I have been Googling and wiki'ing for weeks now and I think I have it right but I need someone to confirm or correct what i have done.. The graph data comes from and Optical Rotary...

Is there any observational data available for evolution of Hubble rate? To give some context, read the dark energy FAQ by Sean Caroll here. He says: "If the universe is decelerating, the Hubble constant is decreasing. If the Hubble constant is increasing, the universe is accelerating. But...

I'm trying to get an understanding on what's going on with some data of mine. I've attached some plots below. This data is from and accelerometer and gyroscope where I've calculated the global accelerations and velocities (top and bottom plot respectively in each figure). The data is from the...

http://opendata.cern.ch/ http://opendata.cern.ch/about

Hey! :o I have the main function of a program in a .c file. The main function uses data structures which are defined in an other .c file. And the main function uses also a .txt file to get some inputs. Is it possible to run the program if the main function is an other file as the definition...

Hi there, this looks like a great forum :-) I would need help with the folding procedure for raw data from mossbauer spectroscopy. Our software doesn't, for some reason, fold the data correctly, so we want to attempt a manual procedure. But how do we determine the correct sense/direction of...

Homework Statement Hi there! I have a data set of r (independent variable) and E (electric field strength) (dependent variable). The question asks for a non graphical method to show if there is an inverse square law relationship between the two data sets. -- My attempt: I picked the equation...

hello I need some help. I created one example to understand some basic component ram memory A accumulator 4bit R1 resistor 4 bit ( R1 is temporary data storage register ) Register memory address bus - 2 bits (RA0,1); Register memory data bus - 4 bits (RD0~3); Register memory read enable...

Hi everyone. It's been years since I've done any stats, so I need a bit of help, please. I want to include it in a blog post I'm going to do (not here on PF), so I don't want to give away too many details :p I apologise for my terrible understanding of stats, please be patient! Anyway, over...

Hi, this is my first post here. I have come across this site many times when looking for help and have found the most helpful information here. Thanks! I am creating a spreadsheet that you can input your vehicles Cylinders, Piston Diameter, Stroke, Displacement, HP, Torque, Size, Weight, Tires...

Hey everyone, so for fiber optic networks we can either (in analogy) increase how fast the cars or photons move or add more lanes to increase the amount of data. What if now we use the color of the light to interpret several times more data?

The thickness of an unexposed filter is 40um and a diameter of 46.2mm. I have an exposed air sampling filter with a mass concentration of the particulate (from gravimetric analysis) 20.1ug/m3. If I assume that the particulates are uniformly distributed in the surface of the filter, is it...

Hello Everyone, I really can't understand stats and it's driving me crazy. I have data for births linked with different years, the graphic looks like this But I need to make a prediction on the births in year 2010. How do I go about that?!

Are there any elaborated theory or method how to fit parameters of a function family to data given by probability distributions of data points instead of given coordinates of points precisely without error? I think this is a very general problem, I hope it is already solved. Important: I...

hey guys I am learning greenfoot programming in college. I found out one multiple choice question that make me quite confused. Which of the following is a valid data type? A. integer B. floating C. boolean D. number Why is the answer option C? I think that integer, floating and boolean...

Homework Statement sample data as bellow: 46,48,51,50,45,53,50,48 to find the estimated varaince , the ans with 6.10 is correct... why can't i use this way? my ans for second way is 19051. which is wrong...Homework EquationsThe Attempt at a Solution Var(x) = E(x^2) -( E(x)^2) = 19159- (...

Ages ago I read that the maximum possible bandwidth using radio waves was in the low tbps range. I've had this rattling around in my head ever since and have occasionally tried looking it up to see if it was true. I've not had much luck in that but it did prompt me to start wondering what the...

I wonder how can I get the data recorded on a scale be transferred onto a laptop directly? forexample, I need a curve in the change in weight of something in the past minute, I am looking forward to at least one measurement per second, preferably 10 per second or much higher. The recorded data...

Write an if-else statement to describe an object. Print "Balloon" if isBalloon is true and isRed is false. Print "Red balloon" if isBalloon and isRed are both true. Print "Not a balloon" otherwise. End with newline. Sample program: #include <iostream> using namespace std; int main() { bool...

Boolean refers to a quantity that has only two possible values, true or false. The language has the built-in data type bool for representing Boolean quantities. thats what my book says. i don't really understand the purpose. here's a passage from my book: int main() { bool isLarge = false...

Hey everyone. I want to extract numerical data from files let's say g0001.txt to g0060.txt and store it in a matrix with each element is an array. like this: M=[g1() g2() g3() ...g60()] matrix order can be 1 x 60 , i.e. to say 1 row and 60 columns and each element is an array...

Homework Statement I have all of the data but I just can't find the equation to linearize it. X values: 0, 1.98, 3.96, 5.94, 7.92, 9.9, 11.88 Y values: 1.98, 7.13, 9.08, 11.04, 12.57, 14.51, 14.342. The attempt at a solution I know it is not a parabola, cubic, exponential, or inverse.

I need to create scales for a test before running t-tests / ANOVA. Instrument: One attitude survey test with 37 questions. Each question is a Likert type question with 1 to 5 points. Data Set: The set of data includes pre-test and post-test scores. There was a 6 month delay between the...

Hello guys, I would like to calculate the confidence interval of the data in which the data is correct. In otherwords I would like to know how much confidence we have that the data is correct. Could anyone direct me where to start? Thank you.

Homework Statement We did an Experiment on a voltage divider and a resistive voltage divider. we had to meassure the voltage in dependency of the resistence. we did divide every meassure by the main voltage or main resistance to fit it into one plot. For evaluation i have attached the plot on...

Hello! From a data set of F-x measurements of a single dsDNA molecule I want to calculate the persistence length P . So I plotted \frac {1} {\sqrt{(F)}} vs. x and fitted these data points (linear). According to an interpolation formula the extension x of a worm like chain with contour...