This report describes standardized data for “Assessment of Varieties of Cassava for high yield, disease resistance in a Advanced Yield Trial (106 clones) at Zaria in 1997/98 Breeding Season”. These data were standardized on 2024-09-18 by Robert Hijmans with this R script. The original data have a CC-BY license. Here you can download the standardized data.

This is the full citation of the data set:

Kulakow, Peter; Ismail Rabbi; Elizabeth Parkes; Chiedozie Egesi; Olufemi Aina; Prasad Peteti; Agbona Afolabi (1998). Assessment of Varieties of Cassava for high yield, disease resistance in a Advanced Yield Trial (106 clones) at Zaria in 1997/98 Breeding Season. International Institute of Tropical Agriculture (IITA). Not versioned. doi:10.25502/8AVG-F981

The dataset has 416 records and 28 variables for cassava in Nigeria. The dataset has 1 treatment(s): variety.


These are the first 25 records:

records
trial_id planting_date harvest_date on_farm is_survey rep crop variety variety_alt variety_code dmy_storage fwy_storage yield_part yield yield_moisture N_fertilizer P_fertilizer K_fertilizer irrigated plot_length plot_width country location longitude latitude geo_from_source
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA30572 NA 5 1.0 3600 roots 3600 71.7 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA4(2)1425 NA 246 1.4 4400 roots 4400 68.7 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA8200058 NA 268 4.0 12000 roots 12000 67.0 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960004 NA 1531889 NA NA roots NA NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960016 NA 576 NA 2000 roots 2000 NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960017 NA 1531890 0.6 2000 roots 2000 69.3 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960023 NA 578 1.2 3400 roots 3400 63.6 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960039 NA 19471 0.9 2400 roots 2400 62.2 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960054 NA 810411 0.5 1400 roots 1400 63.5 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960097 NA 588 2.6 8000 roots 8000 67.1 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960102 NA 590 0.6 1600 roots 1600 64.8 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960140 NA 2787 3.2 10000 roots 10000 68.2 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960216 NA 2793 3.3 10000 roots 10000 67.0 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960241 NA 39453 3.6 11000 roots 11000 67.4 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960249 NA 598 NA 2400 roots 2400 NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960279 NA 1183940 NA 6000 roots 6000 NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960304 NA 600 1.8 5200 roots 5200 64.9 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960356 NA 1183989 1.7 6400 roots 6400 73.9 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960362 NA 1183995 1.9 6000 roots 6000 68.1 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960411 NA 1184026 0.4 1800 roots 1800 76.5 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960508 NA 1184112 NA 1200 roots 1200 NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960513 NA 2800 1.2 3000 roots 3000 61.3 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960523 NA 609 2.4 7000 roots 7000 66.0 NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960536 NA 802584 NA 2800 roots 2800 NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE
97ayt104ZA 1997-08-10 1998-07-29 FALSE FALSE 1 cassava IITA-TMS-IBA960574 NA 802586 NA 2400 roots 2400 NA NA NA NA NA NA NA Nigeria Zaria 7.71995 11.0855 TRUE


The observations were made at 1 locations. We have coordinates for 1 of these locations.


The standardization script emits the following non-compliance warnings.

type message
NA values yield

The overall quality of the dataset, given the completeness of required variables was 6.2 on a scale of 10. See the table below

variable completeness (%)
planting_date 100
harvest_date 100
crop 100
variety 100
N_fertilizer 0
P_fertilizer 0
K_fertilizer 0
irrigated 0
latitude 100
longitude 100
location 100
adm 0
yield 100


The data are further summarized in the table below.

Variable Stats / Values Freqs (% of Valid) Graph Missing
trial_id [character] 1. 97ayt104ZA
416(100.0%)
 0 (0.0%)
planting_date [character] 1. 1997-08-10
416(100.0%)
 0 (0.0%)
harvest_date [character] 1. 1998-07-29
416(100.0%)
 0 (0.0%)
on_farm [logical] 1. FALSE
416(100.0%)
 0 (0.0%)
is_survey [logical] 1. FALSE
416(100.0%)
 0 (0.0%)
rep [integer]
Mean (sd) : 2.5 (1.1)
min ≤ med ≤ max:
1 ≤ 2.5 ≤ 4
IQR (CV) : 1.5 (0.4)
1:104(25.0%)
2:104(25.0%)
3:104(25.0%)
4:104(25.0%)
 0 (0.0%)
crop [character] 1. cassava
416(100.0%)
 0 (0.0%)
variety [character]
1. IITA-TMS-ZAR950594
2. IITA-TMS-IBA30572
3. IITA-TMS-IBA4(2)1425
4. IITA-TMS-IBA8200058
5. IITA-TMS-IBA960004
6. IITA-TMS-IBA960016
7. IITA-TMS-IBA960017
8. IITA-TMS-IBA960023
9. IITA-TMS-IBA960039
10. IITA-TMS-IBA960054
[ 95 others ]
6(1.4%)
4(1.0%)
4(1.0%)
4(1.0%)
4(1.0%)
4(1.0%)
4(1.0%)
4(1.0%)
4(1.0%)
4(1.0%)
374(89.9%)
 0 (0.0%)
variety_alt [logical]
All NA's
 416 (100.0%)
variety_code [integer]
Mean (sd) : 812086.9 (593287.4)
min ≤ med ≤ max:
5 ≤ 1184188 ≤ 1531895
IQR (CV) : 1293947 (0.7)
 105 distinct values 0 (0.0%)
dmy_storage [numeric]
Mean (sd) : 1.6 (1.1)
min ≤ med ≤ max:
0.1 ≤ 1.3 ≤ 4.6
IQR (CV) : 1.6 (0.7)
 38 distinct values 271 (65.1%)
fwy_storage [integer]
Mean (sd) : 3514 (2754.2)
min ≤ med ≤ max:
200 ≤ 2800 ≤ 15200
IQR (CV) : 3250 (0.8)
 53 distinct values 44 (10.6%)
yield_part [character] 1. roots
416(100.0%)
 0 (0.0%)
yield [integer]
Mean (sd) : 3514 (2754.2)
min ≤ med ≤ max:
200 ≤ 2800 ≤ 15200
IQR (CV) : 3250 (0.8)
 53 distinct values 44 (10.6%)
yield_moisture [numeric]
Mean (sd) : 67.2 (4.4)
min ≤ med ≤ max:
58 ≤ 66.7 ≤ 79
IQR (CV) : 5.6 (0.1)
 102 distinct values 267 (64.2%)
N_fertilizer [logical]
All NA's
 416 (100.0%)
P_fertilizer [logical]
All NA's
 416 (100.0%)
K_fertilizer [logical]
All NA's
 416 (100.0%)
irrigated [logical]
All NA's
 416 (100.0%)
plot_length [logical]
All NA's
 416 (100.0%)
plot_width [logical]
All NA's
 416 (100.0%)
country [character] 1. Nigeria
416(100.0%)
 0 (0.0%)
location [character] 1. Zaria
416(100.0%)
 0 (0.0%)
geo_from_source [logical] 1. TRUE
416(100.0%)
 0 (0.0%)