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- ** File: Memory.hlp
- ** Index: 9
-
- ** Missing Value and Memory Management ****
-
-
- █ Missing values
-
- In the TechPlot's data sheet, all cells
- take on numeric input. They are in the
- double precision format. Any non-numeric
- ASCII text, positive infinite, and negative
- infinite are considered as missing values.
-
-
- █ How missing values are handled by
- functions and commands
-
- 1. In the mathematical calculation
- (transformation) of data columns, rows
- with missing values are ignored when
- the operations are carried out. Where
- there are multiple columns that must be
- operated on simultaneously (such as in
- the interpolation, sorting and curve
- fitting commands), rows are ignored if
- any column has a missing value in that
- row.
-
- 2. The descriptive statistics result
- will show number of missing value in
- one column.
-
- 3. Curve Fitting and Missing Data: All
- independent and dependent variable
- values associated with missing values
- are ignored. Since a missing value
- reduces all columns by one row,
- TechPlot still requires the independent
- and dependent variable column lengths
- to be equal.
-
- █ How missing values are handled
- in graphs
-
- Missing values are always deleted from
- all columns before they are plotted. If a
- group of columns is plotted together, the
- entire row is ignored if any of the column
- has a missing value in that row.
-
-
- █ Memory management
-
- TechPlot takes advantages of DOS
- extended and expanded memory for both data
- handling and plotting. EMS is used for
- both code and data management; XMS is only
- used for data handling. If you have a
- choice of both EMS and XMS, EMS is
- preferred.
-
-
- █ Making slides
-
- To make slides from your plots, you
- must first convert them to a file format
- that is compatible with your slide making
- equipment. Several of the file formats
- available in TechPlot can be used to make
- slides: HPGL (Hewlett-Packard Graphics
- Language) and PIC (Lotus Picture). HPGL
- has much higher resolution than PIC. If
- you are using a slide service bureau, find
- which file formats are compatible with
- their equipment.
-
-