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import { Observation } from '../../types/types';
import { ParametersType, ToolInfo } from '../../types/tool_types';
import { BaseTool } from '../BaseTool';
const cohensDToolParams = [
{
name: 'meandifference',
type: 'number',
description: 'The difference between the means of two groups',
required: true
},
{
name: 'standarddeviation',
type: 'number',
description: 'The pooled standard deviation of the two groups',
required: true
},
{
name: 'samplesize1',
type: 'number',
description: 'The sample size of the first group',
required: true
},
{
name: 'samplesize2',
type: 'number',
description: 'The sample size of the second group',
required: true
}
] as const;
type CohensDToolParamsType = typeof cohensDToolParams;
const cohensDToolInfo: ToolInfo<CohensDToolParamsType> = {
name: 'cohensdtool',
description: 'Calculates Cohen\'s d for effect size and determines statistical significance levels.',
citationRules: 'No citation needed.',
parameterRules: cohensDToolParams
};
export class CohensDTool extends BaseTool<CohensDToolParamsType> {
constructor() {
super(cohensDToolInfo);
}
async execute(args: ParametersType<CohensDToolParamsType>): Promise<Observation[]> {
const { meandifference, standarddeviation, samplesize1, samplesize2 } = args;
const pooledSD = Math.sqrt(((samplesize1 - 1) * Math.pow(standarddeviation, 2) + (samplesize2 - 1) * Math.pow(standarddeviation, 2)) / (samplesize1 + samplesize2 - 2));
const cohensD = meandifference / pooledSD;
return [{ type: 'text', text: `Cohen's d: ${cohensD.toFixed(3)}` }];
}
}
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