You can get a negative Rmeas in a shell where <I> is negative 

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> On 1 Jul 2021, at 14:21, Winter, Graeme (DLSLtd,RAL,LSCI) 
> <[email protected]> wrote:
> 
>  Thanks for sending the logs
> 
> Looking at the output the negative R values don’t come from xia2 directly
> 
> For AUTOMATIC/DEFAULT/NATIVE                 Overall    Low     High
> High resolution limit                           1.01    2.74    1.01
> Low resolution limit                           36.95   36.97    1.03
> Completeness                                   68.6    72.2    16.3
> Multiplicity                                    3.4     4.0     1.1
> I/sigma                                         6.8    11.0     0.6
> Rmerge(I)                                     0.127   0.131   1.543
> Rmerge(I+/-)                                  0.121   0.127   1.173
> Rmeas(I)                                      0.141   0.147   2.162
> Rmeas(I+/-)                                   0.145   0.151   1.659
> Rpim(I)                                       0.059   0.062   1.512
> Rpim(I+/-)                                    0.078   0.079   1.173
> CC half                                       0.985   0.971   0.149
> Wilson B factor                              11.910
> Anomalous completeness                         45.7    57.6     1.8
> Anomalous multiplicity                          2.1     2.5     1.0
> Anomalous correlation                        -0.106  -0.135   0.000
> Anomalous slope                               0.921
> dF/F                                          0.079
> dI/s(dI)                                      0.699
> Total observations                           143283    9600     559
> Total unique                                  41851    2397     494
> Assuming spacegroup: P 41 21 2
> Other likely alternatives are:
> P 43 21 2
> Unit cell:
>  78.580  78.580  36.950
>  90.000  90.000  90.000
> 
> While a 1990’s reviewer would have a hard time with those merging stats, I 
> have seen worse and they seem internally consistent
> 
> I wonder, is ccp4i2 doing something itself which arrives at those numbers?
> 
> i2 devs - thoughts?
> 
> Thanks Graeme
> 
>>> On 1 Jul 2021, at 05:49, Winter, Graeme (DLSLtd,RAL,LSCI) 
>>> <[email protected]> wrote:
>>> 
>>> Something odd happening there - please could you send the text log off 
>>> list? i.e. xia2.txt
>>> 
>>> Thanks Graeme
>>> 
>>> On 1 Jul 2021, at 00:58, Murpholino Peligro <[email protected]> wrote:
>>> 
>>> Why Rmeas is negative in DIALS output?
>>> 
>>> 
>>> Thanks
>>> 
>>> 
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>>> <Screenshot from 2021-06-30 18-46-10.png>
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