Changes in version 0.1.23                        

  - Omission of pre-vaccination scores improved.

                       Changes in version 0.1.22                        

  - Color specifying option implemented.

                       Changes in version 0.1.21                        

  - Omission of pre-vaccination scores implemented.

                       Changes in version 0.1.20                        

  - yyyymmdd checking implemented.

                       Changes in version 0.1.19                        

  - Bug fix for plotAllABT().

                 Changes in version 0.1.18 (2021-10-28)                 

  - Documents were improved for CRAN submission.

                       Changes in version 0.1.17                        

  - halfLifeABT() was introduced for half-life calculation.

                       Changes in version 0.1.16                        

  - main argument was implemented to plotEachABT() and plotAllABT().

                       Changes in version 0.1.15                        

  - attribNumeric argument was added to readABT().
  - From this version, lines will be colored according to lineAttrib.

                       Changes in version 0.1.14                        

  - plotAllABT_discrete.R was improved.

                       Changes in version 0.1.13                        

  - One of the default attributes was changed to "Very low".

                       Changes in version 0.1.12                        

  - Lowess lines in the logY mode was improved.
  - From this version, the width and height of PDF can be modified.

                       Changes in version 0.1.11                        

  - Position of legends in the logY mode was improved.

                       Changes in version 0.1.10                        

  - argument logY was added to plotEachABT() and plotAllABT().

                        Changes in version 0.1.9                        

  - column names post_2nd_shot_yyyymmdd and post_2nd_shot_score were
    replaced with point3_yyyymmdd and point3_score.
  - From this version, first two sampling points will be plotted
    discretely and the followings will beplotted on a continuous time
    scale.
  - plotAllABT will draw geometric mean and 95% CI lines in the discrete
    mode.

                        Changes in version 0.1.8                        

  - subset.ABT() was improved.
  - groupAttribABT() was added.

                        Changes in version 0.1.7                        

  - In the discrete mode, after-2nd shot titers are included in the
    bins.

                        Changes in version 0.1.6                        

  - Discrete mode was implemented for plotAllABT().
  - type: M1, M2, M3, M4, M6

                        Changes in version 0.1.5                        

  - Variable attributes were introduced in the ABT xlsx format.
  - subset() can now be used for ABT objects.
  - plotAllABT. can now draw lowess lines for each groups in a specified
    attribute.

                 Changes in version 0.1.4 (2021-09-30)                  

  - Improved for CRAN submission

                        Changes in version 0.1.3                        

  - Improved for CRAN submission

                        Changes in version 0.1.2                        

  - Prepared for CRAN submission

                        Changes in version 0.1.1                        

  - Updated

                        Changes in version 0.1.0                        

  - Initial addition of functions