How to determine probit value?

Method A for determining probits involves referencing Finney's table (Finney 1952), a renowned resource in the field. This approach simplifies the process of converting percentages of responses into their corresponding probit values.

Specifically, when the percentage of responses is 17%, the table indicates that the corresponding probit value is 4.05. This numerical representation allows for a more precise analysis and comparison of data across various studies or experiments.

Similarly, for a critical threshold such as 50% response (LC50), the Finney's table provides a straightforward conversion to its probit value, which in this case is 5.00. This value signifies the median effect level, offering valuable insights into the potency of the stimulus under investigation.

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