Recent content by Lorna

Oh yes! Thank you a lot! How would we calculate the error in the y-intercept? would it be zero? Thank you!

Hello, Does anyone have an idea about how to use fit data with a line while fixing the slope in MS. Excel? Does linest by anyway capable of doing that? Thank you Lorna

I think how large the standard-deviation is tells us about the precision rather than the accuracy of the measurements. So if there are a couple of data points with some errors +/-, and one says that all the errors are 1-sigma errors, what do they mean? The data points are not multiple...

so is it the same as the specific intensitiy? the Intensity per unit frequency or wavelength?

Hi everyone, What does the "relative intensity" mean when we talk about spectra? The intensity relative to what, the background? Thank you

Hi everyone, When people present their data in plots, they always talk about 1-sigma errors, which I totally don't understand. Don't we use the standard deviation to tell us how far the a data point is from the "mean"? Why would I care about the mean when discussing errors? Shouldn't one care...

ok thanks ...

I have a set of data: data ------ x1 x2 x3 x4 ...etc I used two methods "standard_chi-sqr" and "improved_chi-sqr" to minimize the fits to these data so I have now: data, standard-chi-sqr, improved_chi-sqr ---------------------------------------------------- x1 , v1 ...

THANK YOU! Very helpful

Hi all, Does anyone know if there is a recent table of the abundances of elements in the Small Magellanic Cloud. Thanks all

Now I see. Thank you SO MUCH!

Thank you, althought I still don't understand why "1" not another number

What is the significance of the '1' ? and why not just log(error)?

Hello, I have a column of 'x' values, each with an error 'err_x' serving as error bars. My question is: If I need to plot 'log(x)', Do I need to make any changes to 'err_x' to reflect the log operation before plotting them as error bars ? Thank you in advance Lorna

orbital v = (GM/r)^1/2 so do we add 1/2 m v^2 + GmM/r = 3/2 G mM/r ~ 3/2 GM/r ? and then delta (phi) = 3/2 G M/r - GM/R? If that's correct then I missed up with the signs.