large meteorites large meteorites

The `name` column holds a unique short label for each of the 4871 rows (n_unique == n, duplicate_rate 0.0), averaging 13.8 characters and 2.2 words. Top tokens like 'africa', 'northwest', 'dhofar', 'jiddat' and 'harasis' strongly suggest these are meteorite or specimen designations (e.g. 'Northwest Africa', 'Dhofar', 'Jiddat al Harasis' find sites). About 32% are single-word names, and the vocabulary of 4632 tokens across 4871 names confirms heavy reuse of regional prefixes with numeric suffixes. Treatment: Treat as a unique row identifier; drop from modelling or parse out the regional prefix as a categorical feature. high · anthropic:claude-opus-4-7

n

4,871

nulls

0 (0.0%)

unique

4,871

len_min

3

len_max

28

len_mean

13.8

len_median

12

len_p95

21

word_mean

2.215

word_median

2

n_empty

0

n_duplicates

0

duplicate_rate

0

vocab_size

4,632

readability_flesch_mean

52.55

emoji_rate

0

url_rate

0

one_word_rate

0.3221

allcaps_rate

0

boilerplate_rate

0

This is the recorded mass in grams for 4,871 specimens, with 2,850 unique values and no nulls. The distribution is extraordinarily right-skewed (skew 25.1, kurtosis 723.6): the median is just 3,600 g while the mean is 123,403 g and the max reaches 60,000,000 g, producing 712 outliers (14.6% of rows). The standard deviation of 1,755,278 dwarfs the IQR of 10,313, indicating a handful of enormous specimens dominate the tail. Treatment: Log-transform before any modelling and consider winsorising the upper tail. high · anthropic:claude-opus-4-7

n

4,871

nulls

0 (0.0%)

unique

2,850

min

1,000

max

6e+07

mean

1.234e+05

median

3,600

std

1.755e+06

q1

1686

q3

12,000

iqr

1.031e+04

skew

25.12

kurtosis

723.6

n_outliers

712

outlier_rate

0.1462

zero_rate

0

This column holds meteorite classification codes (e.g., L6, H5, Iron IIIAB), a standard taxonomy for stony and iron meteorites. With 261 distinct classes across 4871 rows and entropy ratio 0.65, the distribution is moderately diverse but heavily concentrated: the top class L6 covers 16.9% and the five most common ordinary chondrite classes (L6, H5, L5, H4, H6) together dominate. No nulls, but the long tail of 250+ rare classes will be sparse. Treatment: Group rare classes into an 'other' bucket or roll up to parent groups (H/L/LL/Iron) before one-hot encoding. high · anthropic:claude-opus-4-7

n

4,871

nulls

0 (0.0%)

unique

261

top_value

L6

top_rate

0.1694

cardinality

261

entropy

5.197

entropy_ratio

0.6474

This is a binary categorical flag distinguishing meteorites that were 'Found' versus those observed to have 'Fell'. The class is heavily imbalanced — 'Found' accounts for 4129 of 4871 records (top_rate 0.8477) while 'Fell' makes up the remaining 742, with no nulls. Entropy of 0.6156 confirms the skew but the column is fully populated and clean. Treatment: Encode as a binary indicator; account for class imbalance if used as a stratifier or target. high · anthropic:claude-opus-4-7

n

4,871

nulls

0 (0.0%)

unique

2

top_value

Found

top_rate

0.8477

cardinality

2

entropy

0.6156

entropy_ratio

0.6156

Geographic latitude in decimal degrees, spanning -87.37 to 81.17 with a median of 24.00, consistent with a worldwide point dataset. The distribution is left-skewed (-1.23) with 500 flagged outliers (12.0%) and an 8.4% zero rate that may indicate placeholder or equator-rounded values. Roughly 14.3% of rows are null, so geographic analyses will lose a meaningful slice. Treatment: Pair with longitude for geo-features; investigate the 8.4% zeros for sentinel encoding before modelling. high · anthropic:claude-opus-4-7

n

4,871

nulls

697 (14.3%)

unique

2,861

min

-87.37

max

81.17

mean

9.763

median

24

std

39.21

q1

0

q3

35.66

iqr

35.66

skew

-1.228

kurtosis

0.4314

n_outliers

500

outlier_rate

0.1198

zero_rate

0.08385

Geographic longitude in decimal degrees, spanning -165.43 to 178.2 with median 12.16 and an IQR of 133.79, consistent with worldwide coverage. Distribution is nearly symmetric (skew 0.14) and platykurtic (kurtosis -0.85), with no flagged outliers. Notable concerns: 14.31% of rows are null and 8.36% are exactly zero, which often indicates missing coordinates encoded as 0 rather than true Gulf-of-Guinea points. Treatment: Treat zeros as missing, then pair with latitude for geospatial features. high · anthropic:claude-opus-4-7

n

4,871

nulls

697 (14.3%)

unique

3,122

min

-165.4

max

178.2

mean

7.871

median

12.16

std

82.3

q1

-78.08

q3

55.71

iqr

133.8

skew

0.1374

kurtosis

-0.845

n_outliers

0

outlier_rate

0

zero_rate

0.08361

This column holds ISO-format dates stored as strings, but every observed value falls on January 1st of a year, suggesting year-only granularity padded to a date. Across 4871 rows there are 243 distinct values with a 1.11% null rate, and the most common entry '2000-01-01' accounts for just 4.88% of records, giving a fairly flat distribution (entropy ratio 0.84). The concentration of top values in the early 2000s hints at a temporal bias in the dataset. Treatment: Parse to datetime and extract year as the effective granularity before modelling. high · anthropic:claude-opus-4-7

n

4,871

nulls

54 (1.1%)

unique

243

top_value

2000-01-01

top_rate

0.04879

cardinality

243

entropy

6.668

entropy_ratio

0.8414

This column is a year value, likely a publication or release date, ranging from 1399 to 2013 with a median of 1990 and IQR spanning 1945-2002. The distribution is heavily left-skewed (skew -2.27, kurtosis 9.38) with 216 outliers (4.48%) trailing into very early centuries, suggesting a small set of historical or erroneous entries pulling the tail. Null rate is low at 1.11% across 4871 rows. Treatment: Inspect pre-1900 outliers for data-entry errors; consider clipping or treating as ordinal before modelling. high · anthropic:claude-opus-4-7

n

4,871

nulls

54 (1.1%)

unique

243

min

1,399

max

2,013

mean

1968

median

1,990

std

51.83

q1

1,945

q3

2,002

iqr

57

skew

-2.271

kurtosis

9.377

n_outliers

216

outlier_rate

0.04484

zero_rate

0

This is a constant categorical column where every one of the 4871 rows holds the value "large_meteorites". Cardinality is 1, entropy is 0, and the top rate is 1.0, so the field carries no information for modelling or segmentation. It likely encodes the dataset's provenance or subset label rather than a row-level attribute. Treatment: Drop before modelling; retain only as a dataset-level tag. high · anthropic:claude-opus-4-7

n

4,871

nulls

0 (0.0%)

unique

1

top_value

large_meteorites

top_rate

1

cardinality

1

entropy

0

entropy_ratio

0

Short, templated descriptive sentences about meteorites — every one of the 4871 rows is unique yet contains the words 'meteorite', '-', and 'mass:', indicating a generated string like 'Northwest Africa meteorite - mass: ... found.' Lengths are tight (39–82 chars, mean 53.6) and there are no nulls, duplicates, URLs, or emoji. Despite being unique per row, the vocabulary is small (6296) and dominated by classification tokens (l6., h5., iron,) plus locality terms, suggesting a synthesised summary rather than free-form prose. Treatment: Parse out the structured fields (class, locality, mass) instead of embedding the raw string. high · anthropic:claude-opus-4-7

n

4,871

nulls

0 (0.0%)

unique

4,871

len_min

39

len_max

82

len_mean

53.59

len_median

54

len_p95

65

word_mean

8.396

word_median

8

n_empty

0

n_duplicates

0

duplicate_rate

0

vocab_size

6,296

readability_flesch_mean

58.7

emoji_rate

0

url_rate

0

one_word_rate

0

allcaps_rate

0

boilerplate_rate

0