measurement error

  1. B

    Aggregate precision of a measurement instrument based on a sample of measurements whose true errors are known

    I want to estimate the accuracy and precision of aggregate data from an instrument that measures a variable that fluctuates over time by comparing a sample of its measurements to concurrent measurements made by a reference instrument. For this purpose, assume that the reference instrument...
  2. N

    Can this problem be modeled?

    I have a question about whether I can model in a way that solves this problem: Suppose a swimming coach has 100 athletes and only cares about the distance they can each swim in 5 minutes. From this, he sets a baseline expectation of each swimmer’s "5-minute distance" expectation that is...
  3. G

    Average and standard deviation

    Hi All, I am measuring the height of a tank over time to calculate the flux. -F is the volume of tank F -On every time point, the volume is measured 3 times (since the way of measuring is quite fault sensitive) So F has an average and a standard deviation. -Flux: (F(t)−F(t−1))/dt, in which dt...
  4. P

    Analyzing skewed data, how to determine % spread and variation? Testing method error

    Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which I'm trying to analyze. I determined the numbers by taking an absolute difference between the true and the measured values and computed the mean...
  5. J

    Modelling continuous measurements

    In the attachment from a set of notes, a brief description of how we describe a continuous measurement is described. I have a few basic questions regarding this, any assistance would be appreciated: Questions: I think the motivation for defining \DeltaW_n is to define it as the error per...
  6. J

    Description of continuous measurement

    In the pdf attachment from a set of notes, a brief description of how we describe a continuous measurement is described. I have a few basic questions regarding this, any assistance would be appreciated: Questions: - I think the motivation for defining \DeltaW_n is to define it as the error...
  7. G

    Regression on estimated variables

    I'm making a two-step analysis for my data. First Step: I've collected inflation and interest rate data for 25 countries in a monthly frequency for the last 20 years. I run a simple linear of inflation (right side, X) on interest rate (left side, y) for each country. At the end of this step...
  8. Junes

    Power calculation with measurement error on Y

    I'm trying to do a power calculation for a study I'm involved in, and I'm a bit stuck. The study is about textual cues of trust. We want to analyze a number of predictors in the text using the LIWC tool (which generates features based on text) and correlate them with perceived trust as...
  9. S

    Help on method selection

    Hi all, I wonder whether some of you have some valuable input on which method I should use in my research. The main idea is that I decompose a explanatory variable from a standard OLS regression (x_t) into two components, predictable and unpredictable. I would like to test whether the effect...