CMB data help
CMB data help
Dear friends:
Who can explain the meaning of binned data of CMB power spectra? How to get the binned data (mean value and the error bar) from the unbinned data? or introduce a paper for me? Thanks a lot!
Who can explain the meaning of binned data of CMB power spectra? How to get the binned data (mean value and the error bar) from the unbinned data? or introduce a paper for me? Thanks a lot!
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- Posts: 144
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- Affiliation: University College London (UCL)
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CMB data help
I thought the binned data was just the weighted mean of the unbinned data (with the weighted mean error bar)? It certainly makes for a sensible looking plot..
Re: CMB data help
Thank you very much! But, as we known, in the bined data, the error bar is much smaller than the unbined data. If is only the weighted mean, the error bar of binned data can not be obtained.
Sarah Bridle wrote:I thought the binned data was just the weighted mean of the unbinned data (with the weighted mean error bar)? It certainly makes for a sensible looking plot..
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- Posts: 183
- Joined: September 24 2004
- Affiliation: Brookhaven National Laboratory
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Re: CMB data help
If you add 1/\sigma^2 it should probably be good enough for most purposes...., i.e. 1/\sigma_binned^2 = \sum 1/\sigma_i^2Zhao Wen wrote:Thank you very much! But, as we known, in the bined data, the error bar is much smaller than the unbined data. If is only the weighted mean, the error bar of binned data can not be obtained.
Sarah Bridle wrote:I thought the binned data was just the weighted mean of the unbinned data (with the weighted mean error bar)? It certainly makes for a sensible looking plot..
Re: CMB data help
Thank you very much! I have known it!
Anze Slosar wrote:If you add 1/\sigma^2 it should probably be good enough for most purposes...., i.e. 1/\sigma_binned^2 = \sum 1/\sigma_i^2Zhao Wen wrote:Thank you very much! But, as we known, in the bined data, the error bar is much smaller than the unbined data. If is only the weighted mean, the error bar of binned data can not be obtained.
Sarah Bridle wrote:I thought the binned data was just the weighted mean of the unbinned data (with the weighted mean error bar)? It certainly makes for a sensible looking plot..