# interpret_cohens_d: Interpret Standardized Differences In effectsize: Indices of Effect Size

 interpret_cohens_d R Documentation

## Interpret Standardized Differences

### Description

Interpretation of standardized differences using different sets of rules of thumb.

### Usage

```interpret_cohens_d(d, rules = "cohen1988", ...)

interpret_hedges_g(g, rules = "cohen1988")

interpret_glass_delta(delta, rules = "cohen1988")
```

### Arguments

 `d, g, delta` Value or vector of effect size values. `rules` Can be `"cohen1988"` (default), `"gignac2016"`, `"sawilowsky2009"`, `"lovakov2021"` or a custom set of `rules()`. `...` Not directly used.

### Rules

Rules apply to equally to positive and negative d (i.e., they are given as absolute values).

• Cohen (1988) (`"cohen1988"`; default)

• d < 0.2 - Very small

• 0.2 <= d < 0.5 - Small

• 0.5 <= d < 0.8 - Medium

• d >= 0.8 - Large

• Sawilowsky (2009) (`"sawilowsky2009"`)

• d < 0.1 - Tiny

• 0.1 <= d < 0.2 - Very small

• 0.2 <= d < 0.5 - Small

• 0.5 <= d < 0.8 - Medium

• 0.8 <= d < 1.2 - Large

• 1.2 <= d < 2 - Very large

• d >= 2 - Huge

• Lovakov & Agadullina (2021) (`"lovakov2021"`)

• d < 0.15 - Very small

• 0.15 <= d < 0.36 - Small

• 0.36 <= d < 0.65 - Medium

• d >= 0.65 - Large

• Gignac & Szodorai (2016) (`"gignac2016"`, based on the `d_to_r()` conversion, see `interpret_r()`)

• d < 0.2 - Very small

• 0.2 <= d < 0.41 - Small

• 0.41 <= d < 0.63 - Moderate

• d >= 0.63 - Large

### References

• Lovakov, A., & Agadullina, E. R. (2021). Empirically Derived Guidelines for Effect Size Interpretation in Social Psychology. European Journal of Social Psychology.

• Gignac, G. E., & Szodorai, E. T. (2016). Effect size guidelines for individual differences researchers. Personality and individual differences, 102, 74-78.

• Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd Ed.). New York: Routledge.

• Sawilowsky, S. S. (2009). New effect size rules of thumb.

### Examples

```interpret_cohens_d(.02)
interpret_cohens_d(c(.5, .02))
interpret_cohens_d(.3, rules = "lovakov2021")
```

effectsize documentation built on Oct. 31, 2022, 5:06 p.m.