Format_Input: Convert raw data into a 'data.frame'
In ltanecon/BayesImp: Bayesian Imputation Method

This function process the raw longitudinal information and store them in a data.frame

1 2	Format_Input(id, wave, income, CPI, weight = 1, bottom.threshold = 1, top.threshold)

`id`	Vector of a unique longitudinal identifier for a survey unit across all waves.
`wave`	Vector of survey data collection periods.
`income`	Vector of income corrsponding to `id` and `wave`.
`CPI`	Vector of CPI corrsponding to `wave`.
`weight`	Vector of survey weight corrsponding to `id`.
`bottom.threshold`	Vector of income bottom-coding threshold corrsponding to `id` and `wave`, or a single value.
`top.threshold`	Vector of income top-coding threshold corrsponding to `id` and `wave`, or a single value.