[R] any package available to calculate systematic root mean square error (RMSEs)?

[Peng Zhao]

Hi. Is there any package available to calculate the systematic root mean
square error (RMSEs) and unsystematic RMSE (RMSEu)? I could not find such a
package. I am too lazy to calculate them step by step.

The calculation could be found in equation 3 and 4 in the Appendix A of the
following link:
http://www.cobblestoneconcepts.com/ucgis2summer/anderson/anderson.htm
http://www.cobblestoneconcepts.com/ucgis2summer/anderson/anderson.htm 



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