Changes in version 1.0.3 (2019-06-07)                  

  - Fix error occurred when .Random.seed does not exits on .GlobalEnv
  - Change the name of the data from 'virtual_data' to 'virtual'

                 Changes in version 1.0.2 (2019-03-22)                  

  - Fix error in setting random seed in the 'ypinterm.default' function

                 Changes in version 1.0.1 (2019-03-15)                  

  - Fix error when setting a random.seed

                 Changes in version 1.0.0 (2018-11-26)                  

  - Add error messages to ypinterim.default to help users detect common
    errors easily.

  - Fixing errors when critvalue is supplied in the ypinterim function.

  - the argument name of spenfun in the ypinterim function is changed to
    spendfun.

  - When the alpha spent is less than 1E-4, the boundaries of that look
    and the corresponding nominal p-values are now obtained using a
    (conditional) normal distribution.

  - When the value of the observed statistic is greater than qnorm(1
    - 1E-4/2), the nominal p-values are now obtained using a normal
    distribution.

  - The default value for repnum is set to 1E4.

  - The the results from print and summary of the ypinterim class now
    show the nominal p-values for the boundaries.

  - Update the references on the help documents and the DESCRIPTION file
    as they are now available online.

  - Add new examples to the ypinterim help documents in order to show
    how to utilize the argument critvalue in the function clearly.

  - Error fixed in the example data: the virtual_data has also been
    changed to have only one group vector.

                 Changes in version 0.1.0 (2017-11-17)                  

  - The initial version