# precision

1. ### 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. ### precision assessment of an experimental method

Hi everyone, I have a very basic knowledge of statistics so apologies if the question is not formulated in appropriate terms. I really hope to get some help from you on this. I have data comprising a response variable and three predictor variables (a,b,c). I would like to assess the...
3. ### Gage R&R results to usable data

This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section modulus of wood, which is used to calculate the SI and whether or not we replace the wood. The measurements using the tools were normalize, that...
4. ### Best way to calculate power, precision & sample size using complex pilot data set?

I have a large and complex pilot data set of electromyographic (EMG) data collected from human subjects performing several different exercises. A single subject was used for all data collection in this pilot experiment. Each data set involves one particular exercise being performed with one...
5. ### precision of two independent classifiers

Consider two classifiers A and B giving binary labels to a big set of candidates, say, we have a million cats and a million dogs for labeling. Assume the two classifiers give independent predictions. Now if classifier A gives a list (500,000) of candidates that are most likely to be dogs (top...
6. ### Standard deviation and sample size

Hi. I have no background on statistics, so please just go down to fundamental for me. But here are some basic questions about statistics and standard deviation .... Assuming study from 20 samples (please don't mind the sample size) found that, for example an average American play 3 +/- 2 hours...
7. ### calculate sample size for sensitivity and specificity in a new diagnositic test

My question is difficult to me, I had read an article about how to calculate sample size the foot note tole me"" ε = required absolute precision on either side of the sensitivity "" what is the absolute precision means ? and generally how to chose required absolute precision on either...
8. ### Precision of Sum of Random Variables

If we increase the sample size on the average by a factor k, then the precision 1/(standard error) on the estimate of the mean increases by a factor of sqrt(n). My question is what if anything can we say quantitatively about the change in precision on the SUM of random variables as the sample...
9. ### satellite data precision

Hi all, I’m looking at some satellite data files. They are profiles of chemical atmospheric components and each profile has an associate estimate precision. I’d like to calculate some daily zonal average i.e. an average of many (about 400) profiles. The problem is that I’m not sure on the...