### 5.0.2. One-Sample Data Types

Three types of data can be analysed:

1) Any number of columns containing raw data can be selected.

2) A pair of columns, one containing data and the other frequency counts (frequency data).

3) A pair of columns, one containing class mid-points and the other frequencies (grouped data).

The following procedures have a Variable Selection Dialogue with three data types:

Statistics 1 → Descriptive Statistics →

Statistics 1 → Distribution Functions →

**Ungrouped Raw Data:** Any number of columns containing
raw data can be selected by clicking on [Var__i__able]. In this case, the
program will perform the procedure on each selected column separately. The
column lengths need not be equal. The graphical procedures with this type of
data (see 5.3.3. Histogram) will plot only one column at a time.

**Data with Frequency Counts****:** This option assumes that the first column contains data values and the
second column contains frequencies corresponding to the values in the first
column. First click on this data type option and then select two columns
clicking on [Column __1__] for the column of values and [Column __2__]
for the column of frequencies. The program keeps track of the value-frequency
correspondence in all relevant procedures.

**Grouped Data****:** It is assumed that the first
column contains class midpoint values and the second column contains
frequencies corresponding to these midpoints. As in the case of data with
frequency counts, two columns must be selected by clicking on [Column __1__]
and [Column __2__].