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  "E2_per_feature_spearman_vs_grade": {
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    "ling_flesch_ease": -0.08173989844811891,
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    "ling_mean_word_len": 0.02956900822701552,
    "ling_cefr_mean": 0.002674775158452901,
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    "ling_cefr_above_b1": 0.05129790510901266,
    "ling_parse_depth": 0.22101631149530393,
    "ling_mean_dep_len": 0.26168823455348367,
    "ling_n_clauses": 0.256747843147321,
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    "math_has_frac": 0.4052097027450501,
    "math_has_decimal": 0.1848272975649822
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  "E3_svamp_within_math_group_variability": {
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    "math_mean_cv": 1.4209781558011692,
    "n_groups_ge5": 8
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  "E4_variance_partition_ridge": {
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    "unique_mathematical": 0.22314845800247268,
    "shared": 0.03936280200676823,
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}