validation types

define validation:

automatic checking of data to ensure only possible, sensible, reasonable data is accepted

describe: range

number must be in a specified range

length

length of inputted characters must match specified number of characters

type

data inputted must be of correct data type

look-up

a specific character must be included

format

data must be incorrect format e.g. 2 characters then 6 integers, etc.

presence

ensures some data has been entered

uniqueness

to check data entered is unique within a system

define valid data

data within the limits of what a user might sensibly or reasonable enter

4 types of ways code might be categorised - valid/non-valid

normal

boundary - data right at the edge of accepted range (but still accepted)

abnormal - valid data that is outside of accepted range (e.g. number between 1 and 10 - 25 is abnormal)

erroneous - data outside of accepted range (e.g. number between 1 and 10 - !!! is erroneous)

how to answer test data question and example

1. state type of data

2. give actual example

3. state whether it will be accepted or rejected

• Normal data would be 15 and it should be accepted.

examples of a 1 dimensional graph

captplot - box, strip, violin (comparing categories)

displot - box, strip, violin (comparing distributions)