checklist

[timriffe]

• add RMSE of age selection to output (mig branch)
• add r2 of line fit to ggb() output (mig branch)
• implement migration in ggb() (mig branch)
• implement migration in seg() (mig branch)
• ensure valid use of mig in ggbseg() (both stages should use mig and in the same way) (mig branch)
• use mig.summed flag (mig branch)
• warn, if total deaths < 25% of population change then either the deaths.summed flag is being used wrong or the user should consider not using the method. Use either message() or warning() (mig branch)
• add more example data (PJ will send spreadsheets)
• implement seg delta method, but think of a better name for it see RD spreadsheet AM_SEG_South Africa_males_3_1.xlsx, calibrate to spirit not values. To iterate or not to iterate?

[timriffe]

checked items implemented in mig branch still untested and likely broken