ASTM E1847 - 96(2013)

    Standard Practice for Statistical Analysis of Toxicity Tests Conducted Under ASTM Guidelines

    Active Standard ASTM E1847 | Developed by Subcommittee: E50.47

    Book of Standards Volume: 11.06


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    Significance and Use

    4.1 The use of statistical analysis will enable the investigator to make better, more informed decisions when using the information derived from the analyses.

    4.1.1 The goals when performing statistical analyses, are to summarize, display, quantify, and provide objective measures for assessing the relationships and anomalies in data. Statistical analyses also involve fitting a model to the data and making inferences from the model. The type of data dictates the type of model to be used. Statistical analysis provides the means to test differences between control and treatment groups (one form of hypothesis testing), as well as the means to describe the relationship between the level of treatment and the measured responses (concentration effect curves), or to quantify the degree of uncertainty in the end-point estimates derived from the data.

    4.1.2 The goals of this practice are to identify and describe commonly used statistical procedures for toxicity tests. Fig. 1, Section 6, following statistical methods (Section 5), presents a flow chart and some recommended analysis paths, with references. From this guideline, it is recommended that each investigator develop a statistical analysis protocol specific to his test results. The flow chart, along with the rest of this guideline, may provide both useful direction, and service as a quality assurance tool, to help ensure that important steps in the analysis are not overlooked.

     Flow Chart for Practice for Statistical Analysis
    FIG. 1  Flow Chart for Practice for Statistical Analysis
     Flow Chart for Practice for Statistical Analysis
    FIG. 1  Flow Chart for Practice for Statistical Analysis (continued)
     Flow Chart for Practice for Statistical Analysis
    FIG. 1  Flow Chart for Practice for Statistical Analysis (continued)
     Flow Chart for Practice for Statistical Analysis
    FIG. 1  Flow Chart for Practice for Statistical Analysis (continued)

    1. Scope

    1.1 This practice covers guidance for the statistical analysis of laboratory data on the toxicity of chemicals or mixtures of chemicals to aquatic or terrestrial plants and animals. This practice applies only to the analysis of the data, after the test has been completed. All design concerns, such as the statement of the null hypothesis and its alternative, the choice of alpha and beta risks, the identification of experimental units, possible pseudo replication, randomization techniques, and the execution of the test are beyond the scope of this practice. This practice is not a textbook, nor does it replace consultation with a statistician. It assumes that the investigator recognizes the structure of his experimental design, has identified the experimental units that were used, and understands how the test was conducted. Given this information, the proper statistical analyses can be determined for the data.

    1.1.1 Recognizing that statistics is a profession in which research continues in order to improve methods for performing the analysis of scientific data, the use of statistical methods other than those described in this practice is acceptable as long as they are properly documented and scientifically defensible. Additional annexes may be developed in the future to reflect comments and needs identified by users, such as more detailed discussion of probit and logistic regression models, or statistical methods for dose response and risk assessment.

    1.2 The sections of this guide appear as follows:

    Title     

    Section

     

    Referenced Documents

    2

    Terminology

    3

    Significance and Use

    4

    Statistical Methods

    5

    Flow Chart

    6

    Flow Chart Comments

    7

    Keywords

    8

    References

     


    1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E178 Practice for Dealing With Outlying Observations

    E456 Terminology Relating to Quality and Statistics

    E1241 Guide for Conducting Early Life-Stage Toxicity Tests with Fishes

    E1325 Terminology Relating to Design of Experiments


    ICS Code

    ICS Number Code 03.120.30 (Application of statistical methods); 07.100.10 (Medical microbiology)

    UNSPSC Code

    UNSPSC Code 77101501(Risk or hazard assessment)


    DOI: 10.1520/E1847-96R13

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