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The organisation of data pertaining to a quantitative phenomenon consists of the adhering to four phases:

1. Unorganised or organised info

2. Discrete or ungrouped

3. Grouped

four. Continual

Ungrouped frequency distribution

A a lot much better way of the illustration of the info is to convey it in the type of a discrete or ungrouped FD wherever we rely the number of periods every single worth of the variable takes place in the earlier mentioned info. This is facilitated by way of the procedure of tally marks or tally bars as described under:

In column I we require to location all the doable values of the variable. In the second column a vertical bar known as the tally mark is set against the variety anytime it happens. Immediately after a certain price has transpired 4 moments, for the fifth occurrence we set a cross tally mark on the first four tally bars to give us a block of 5. When it occurs for the sixth time we place one more tally mark against it and for the tenth occurrence we once more set a cross tally mark on the 6th to ninth tally bars to get an additional block of five and so on. This procedure of putting cross tally marks at each and every fifth repetition facilitates the counting of the quantity of occurrences of the benefit at the conclusion. In the absence of these cross tally marks we get shall get ongoing tally bars and there may well be confusion in counting and we are liable to dedicate blunders also. As a result, the second column is composed of tally marks or tally bars. Right after marking out the tally marks for all the values in the knowledge, we will need to get the range of moments each price is repeated and mention versus the corresponding variety in the column III, entitled frequency.

Cumulative frequency distribution

A frequency distribution simply tells us how commonly a distinct value of the variable is happening. On the other hand, if we want to know the full variety of observations obtaining a benefit 'less than' or 'more than' a specific price of the variable, this frequency desk fails to furnish the details as these. This details can be received very conveniently from the 'cumulative frequency distribution', which is a modification of the supplied FD and is attained on successively incorporating the frequencies of the values of the variable according to the certain legislation. The frequencies so attained are known as the cumulative frequencies abbreviated as c.f.

Frequency distribution histogram